Add browseable samples for L SDK release
Change-Id: I71c6ff9a90b7734042d68af7f01e6d61118cc508
This commit is contained in:
Trevor Johns
@@ -0,0 +1,76 @@
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/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.camera2basic;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.TextureView;
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/**
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* A {@link TextureView} that can be adjusted to a specified aspect ratio.
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*/
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public class AutoFitTextureView extends TextureView {
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private int mRatioWidth = 0;
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private int mRatioHeight = 0;
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public AutoFitTextureView(Context context) {
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this(context, null);
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}
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public AutoFitTextureView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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/**
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* Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
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* calculated from the parameters. Note that the actual sizes of parameters don't matter, that
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* is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
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*
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* @param width Relative horizontal size
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* @param height Relative vertical size
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*/
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public void setAspectRatio(int width, int height) {
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if (width < 0 || height < 0) {
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throw new IllegalArgumentException("Size cannot be negative.");
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}
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mRatioWidth = width;
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mRatioHeight = height;
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requestLayout();
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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int width = MeasureSpec.getSize(widthMeasureSpec);
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int height = MeasureSpec.getSize(heightMeasureSpec);
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if (0 == mRatioWidth || 0 == mRatioHeight) {
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setMeasuredDimension(width, height);
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} else {
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if (width < height * mRatioWidth / mRatioHeight) {
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setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
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} else {
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setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
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}
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}
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}
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}
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@@ -0,0 +1,819 @@
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/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.camera2basic;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.app.DialogFragment;
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import android.app.Fragment;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.content.res.Configuration;
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import android.graphics.ImageFormat;
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import android.graphics.Matrix;
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import android.graphics.RectF;
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import android.graphics.SurfaceTexture;
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import android.hardware.camera2.CameraAccessException;
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import android.hardware.camera2.CameraCaptureSession;
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import android.hardware.camera2.CameraCharacteristics;
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import android.hardware.camera2.CameraDevice;
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import android.hardware.camera2.CameraManager;
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import android.hardware.camera2.CameraMetadata;
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import android.hardware.camera2.CaptureRequest;
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import android.hardware.camera2.CaptureResult;
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import android.hardware.camera2.TotalCaptureResult;
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import android.hardware.camera2.params.StreamConfigurationMap;
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import android.media.Image;
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import android.media.ImageReader;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.HandlerThread;
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import android.util.Log;
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import android.util.Size;
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import android.util.SparseIntArray;
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import android.view.LayoutInflater;
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import android.view.Surface;
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import android.view.TextureView;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Toast;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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public class Camera2BasicFragment extends Fragment implements View.OnClickListener {
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/**
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* Conversion from screen rotation to JPEG orientation.
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*/
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private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
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static {
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ORIENTATIONS.append(Surface.ROTATION_0, 90);
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ORIENTATIONS.append(Surface.ROTATION_90, 0);
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ORIENTATIONS.append(Surface.ROTATION_180, 270);
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ORIENTATIONS.append(Surface.ROTATION_270, 180);
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}
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/**
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* Tag for the {@link Log}.
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*/
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private static final String TAG = "Camera2BasicFragment";
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/**
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* Camera state: Showing camera preview.
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*/
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private static final int STATE_PREVIEW = 0;
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/**
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* Camera state: Waiting for the focus to be locked.
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*/
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private static final int STATE_WAITING_LOCK = 1;
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/**
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* Camera state: Waiting for the exposure to be precapture state.
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*/
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private static final int STATE_WAITING_PRECAPTURE = 2;
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/**
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* Camera state: Waiting for the exposure state to be something other than precapture.
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*/
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private static final int STATE_WAITING_NON_PRECAPTURE = 3;
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/**
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* Camera state: Picture was taken.
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*/
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private static final int STATE_PICTURE_TAKEN = 4;
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/**
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* {@link TextureView.SurfaceTextureListener} handles several lifecycle events on a
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* {@link TextureView}.
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*/
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private final TextureView.SurfaceTextureListener mSurfaceTextureListener
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= new TextureView.SurfaceTextureListener() {
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@Override
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public void onSurfaceTextureAvailable(SurfaceTexture texture, int width, int height) {
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openCamera(width, height);
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}
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@Override
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public void onSurfaceTextureSizeChanged(SurfaceTexture texture, int width, int height) {
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configureTransform(width, height);
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}
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@Override
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public boolean onSurfaceTextureDestroyed(SurfaceTexture texture) {
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return true;
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}
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@Override
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public void onSurfaceTextureUpdated(SurfaceTexture texture) {
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}
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};
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/**
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* ID of the current {@link CameraDevice}.
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*/
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private String mCameraId;
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/**
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* An {@link AutoFitTextureView} for camera preview.
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*/
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private AutoFitTextureView mTextureView;
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/**
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* A {@link CameraCaptureSession } for camera preview.
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*/
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private CameraCaptureSession mCaptureSession;
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/**
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* A reference to the opened {@link CameraDevice}.
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*/
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private CameraDevice mCameraDevice;
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/**
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* The {@link android.util.Size} of camera preview.
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*/
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private Size mPreviewSize;
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/**
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* {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its state.
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*/
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private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
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@Override
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public void onOpened(CameraDevice cameraDevice) {
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// This method is called when the camera is opened. We start camera preview here.
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mCameraOpenCloseLock.release();
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mCameraDevice = cameraDevice;
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createCameraPreviewSession();
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}
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@Override
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public void onDisconnected(CameraDevice cameraDevice) {
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mCameraOpenCloseLock.release();
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cameraDevice.close();
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mCameraDevice = null;
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}
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@Override
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public void onError(CameraDevice cameraDevice, int error) {
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mCameraOpenCloseLock.release();
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cameraDevice.close();
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mCameraDevice = null;
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Activity activity = getActivity();
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if (null != activity) {
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activity.finish();
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}
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}
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};
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/**
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* An additional thread for running tasks that shouldn't block the UI.
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*/
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private HandlerThread mBackgroundThread;
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/**
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* A {@link Handler} for running tasks in the background.
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*/
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private Handler mBackgroundHandler;
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/**
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* An {@link ImageReader} that handles still image capture.
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*/
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private ImageReader mImageReader;
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/**
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* This is the output file for our picture.
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*/
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private File mFile;
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/**
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* This a callback object for the {@link ImageReader}. "onImageAvailable" will be called when a
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* still image is ready to be saved.
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*/
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private final ImageReader.OnImageAvailableListener mOnImageAvailableListener
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= new ImageReader.OnImageAvailableListener() {
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@Override
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public void onImageAvailable(ImageReader reader) {
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mBackgroundHandler.post(new ImageSaver(reader.acquireNextImage(), mFile));
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}
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};
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/**
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* {@link CaptureRequest.Builder} for the camera preview
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*/
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private CaptureRequest.Builder mPreviewRequestBuilder;
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/**
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* {@link CaptureRequest} generated by {@link #mPreviewRequestBuilder}
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*/
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private CaptureRequest mPreviewRequest;
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/**
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* The current state of camera state for taking pictures.
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*
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* @see #mCaptureCallback
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*/
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private int mState = STATE_PREVIEW;
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/**
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* A {@link Semaphore} to prevent the app from exiting before closing the camera.
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*/
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private Semaphore mCameraOpenCloseLock = new Semaphore(1);
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/**
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* A {@link CameraCaptureSession.CaptureCallback} that handles events related to JPEG capture.
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*/
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private CameraCaptureSession.CaptureCallback mCaptureCallback
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= new CameraCaptureSession.CaptureCallback() {
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private void process(CaptureResult result) {
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switch (mState) {
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case STATE_PREVIEW: {
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// We have nothing to do when the camera preview is working normally.
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break;
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}
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case STATE_WAITING_LOCK: {
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int afState = result.get(CaptureResult.CONTROL_AF_STATE);
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if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState ||
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CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) {
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int aeState = result.get(CaptureResult.CONTROL_AE_STATE);
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if (aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
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mState = STATE_WAITING_NON_PRECAPTURE;
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captureStillPicture();
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} else {
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runPrecaptureSequence();
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}
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}
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break;
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}
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case STATE_WAITING_PRECAPTURE: {
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int aeState = result.get(CaptureResult.CONTROL_AE_STATE);
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if (CaptureResult.CONTROL_AE_STATE_PRECAPTURE == aeState) {
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mState = STATE_WAITING_NON_PRECAPTURE;
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} else if (CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED == aeState) {
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mState = STATE_WAITING_NON_PRECAPTURE;
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}
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break;
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}
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case STATE_WAITING_NON_PRECAPTURE: {
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int aeState = result.get(CaptureResult.CONTROL_AE_STATE);
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if (CaptureResult.CONTROL_AE_STATE_PRECAPTURE != aeState) {
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mState = STATE_PICTURE_TAKEN;
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captureStillPicture();
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}
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break;
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}
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}
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}
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@Override
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public void onCaptureProgressed(CameraCaptureSession session, CaptureRequest request,
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CaptureResult partialResult) {
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process(partialResult);
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}
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@Override
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public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request,
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TotalCaptureResult result) {
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process(result);
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}
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};
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/**
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* Given {@code choices} of {@code Size}s supported by a camera, chooses the smallest one whose
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* width and height are at least as large as the respective requested values, and whose aspect
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* ratio matches with the specified value.
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*
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* @param choices The list of sizes that the camera supports for the intended output class
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* @param width The minimum desired width
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* @param height The minimum desired height
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* @param aspectRatio The aspect ratio
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* @return The optimal {@code Size}, or an arbitrary one if none were big enough
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*/
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private static Size chooseOptimalSize(Size[] choices, int width, int height, Size aspectRatio) {
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// Collect the supported resolutions that are at least as big as the preview Surface
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List<Size> bigEnough = new ArrayList<Size>();
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int w = aspectRatio.getWidth();
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int h = aspectRatio.getHeight();
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for (Size option : choices) {
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if (option.getHeight() == option.getWidth() * h / w &&
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option.getWidth() >= width && option.getHeight() >= height) {
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bigEnough.add(option);
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}
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}
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// Pick the smallest of those, assuming we found any
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if (bigEnough.size() > 0) {
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return Collections.min(bigEnough, new CompareSizesByArea());
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} else {
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Log.e(TAG, "Couldn't find any suitable preview size");
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return choices[0];
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}
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}
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public static Camera2BasicFragment newInstance() {
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Camera2BasicFragment fragment = new Camera2BasicFragment();
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fragment.setRetainInstance(true);
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return fragment;
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}
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container,
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Bundle savedInstanceState) {
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return inflater.inflate(R.layout.fragment_camera2_basic, container, false);
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}
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@Override
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public void onViewCreated(final View view, Bundle savedInstanceState) {
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view.findViewById(R.id.picture).setOnClickListener(this);
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view.findViewById(R.id.info).setOnClickListener(this);
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mTextureView = (AutoFitTextureView) view.findViewById(R.id.texture);
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}
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@Override
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public void onActivityCreated(Bundle savedInstanceState) {
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super.onActivityCreated(savedInstanceState);
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mFile = new File(getActivity().getExternalFilesDir(null), "pic.jpg");
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}
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@Override
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public void onResume() {
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super.onResume();
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startBackgroundThread();
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// When the screen is turned off and turned back on, the SurfaceTexture is already
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// available, and "onSurfaceTextureAvailable" will not be called. In that case, we can open
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// a camera and start preview from here (otherwise, we wait until the surface is ready in
|
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// the SurfaceTextureListener).
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if (mTextureView.isAvailable()) {
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openCamera(mTextureView.getWidth(), mTextureView.getHeight());
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} else {
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mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
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}
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}
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@Override
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public void onPause() {
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closeCamera();
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stopBackgroundThread();
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super.onPause();
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}
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||||
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/**
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* Sets up member variables related to camera.
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||||
*
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||||
* @param width The width of available size for camera preview
|
||||
* @param height The height of available size for camera preview
|
||||
*/
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||||
private void setUpCameraOutputs(int width, int height) {
|
||||
Activity activity = getActivity();
|
||||
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
|
||||
try {
|
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for (String cameraId : manager.getCameraIdList()) {
|
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CameraCharacteristics characteristics
|
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= manager.getCameraCharacteristics(cameraId);
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// We don't use a front facing camera in this sample.
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if (characteristics.get(CameraCharacteristics.LENS_FACING)
|
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== CameraCharacteristics.LENS_FACING_FRONT) {
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continue;
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||||
}
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||||
|
||||
StreamConfigurationMap map = characteristics.get(
|
||||
CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
|
||||
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// For still image captures, we use the largest available size.
|
||||
Size largest = Collections.max(
|
||||
Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)),
|
||||
new CompareSizesByArea());
|
||||
mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(),
|
||||
ImageFormat.JPEG, /*maxImages*/2);
|
||||
mImageReader.setOnImageAvailableListener(
|
||||
mOnImageAvailableListener, mBackgroundHandler);
|
||||
|
||||
// Danger, W.R.! Attempting to use too large a preview size could exceed the camera
|
||||
// bus' bandwidth limitation, resulting in gorgeous previews but the storage of
|
||||
// garbage capture data.
|
||||
mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
|
||||
width, height, largest);
|
||||
|
||||
// We fit the aspect ratio of TextureView to the size of preview we picked.
|
||||
int orientation = getResources().getConfiguration().orientation;
|
||||
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
|
||||
mTextureView.setAspectRatio(
|
||||
mPreviewSize.getWidth(), mPreviewSize.getHeight());
|
||||
} else {
|
||||
mTextureView.setAspectRatio(
|
||||
mPreviewSize.getHeight(), mPreviewSize.getWidth());
|
||||
}
|
||||
|
||||
mCameraId = cameraId;
|
||||
return;
|
||||
}
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
} catch (NullPointerException e) {
|
||||
// Currently an NPE is thrown when the Camera2API is used but not supported on the
|
||||
// device this code runs.
|
||||
new ErrorDialog().show(getFragmentManager(), "dialog");
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Opens the camera specified by {@link Camera2BasicFragment#mCameraId}.
|
||||
*/
|
||||
private void openCamera(int width, int height) {
|
||||
setUpCameraOutputs(width, height);
|
||||
configureTransform(width, height);
|
||||
Activity activity = getActivity();
|
||||
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
|
||||
try {
|
||||
if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
|
||||
throw new RuntimeException("Time out waiting to lock camera opening.");
|
||||
}
|
||||
manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
} catch (InterruptedException e) {
|
||||
throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes the current {@link CameraDevice}.
|
||||
*/
|
||||
private void closeCamera() {
|
||||
try {
|
||||
mCameraOpenCloseLock.acquire();
|
||||
if (null != mCaptureSession) {
|
||||
mCaptureSession.close();
|
||||
mCaptureSession = null;
|
||||
}
|
||||
if (null != mCameraDevice) {
|
||||
mCameraDevice.close();
|
||||
mCameraDevice = null;
|
||||
}
|
||||
if (null != mImageReader) {
|
||||
mImageReader.close();
|
||||
mImageReader = null;
|
||||
}
|
||||
} catch (InterruptedException e) {
|
||||
throw new RuntimeException("Interrupted while trying to lock camera closing.", e);
|
||||
} finally {
|
||||
mCameraOpenCloseLock.release();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Starts a background thread and its {@link Handler}.
|
||||
*/
|
||||
private void startBackgroundThread() {
|
||||
mBackgroundThread = new HandlerThread("CameraBackground");
|
||||
mBackgroundThread.start();
|
||||
mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
|
||||
}
|
||||
|
||||
/**
|
||||
* Stops the background thread and its {@link Handler}.
|
||||
*/
|
||||
private void stopBackgroundThread() {
|
||||
mBackgroundThread.quitSafely();
|
||||
try {
|
||||
mBackgroundThread.join();
|
||||
mBackgroundThread = null;
|
||||
mBackgroundHandler = null;
|
||||
} catch (InterruptedException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new {@link CameraCaptureSession} for camera preview.
|
||||
*/
|
||||
private void createCameraPreviewSession() {
|
||||
try {
|
||||
SurfaceTexture texture = mTextureView.getSurfaceTexture();
|
||||
assert texture != null;
|
||||
|
||||
// We configure the size of default buffer to be the size of camera preview we want.
|
||||
texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
|
||||
|
||||
// This is the output Surface we need to start preview.
|
||||
Surface surface = new Surface(texture);
|
||||
|
||||
// We set up a CaptureRequest.Builder with the output Surface.
|
||||
mPreviewRequestBuilder
|
||||
= mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
|
||||
mPreviewRequestBuilder.addTarget(surface);
|
||||
|
||||
// Here, we create a CameraCaptureSession for camera preview.
|
||||
mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
|
||||
new CameraCaptureSession.StateCallback() {
|
||||
|
||||
@Override
|
||||
public void onConfigured(CameraCaptureSession cameraCaptureSession) {
|
||||
// The camera is already closed
|
||||
if (null == mCameraDevice) {
|
||||
return;
|
||||
}
|
||||
|
||||
// When the session is ready, we start displaying the preview.
|
||||
mCaptureSession = cameraCaptureSession;
|
||||
try {
|
||||
// Auto focus should be continuous for camera preview.
|
||||
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
|
||||
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
|
||||
// Flash is automatically enabled when necessary.
|
||||
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
|
||||
CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
|
||||
|
||||
// Finally, we start displaying the camera preview.
|
||||
mPreviewRequest = mPreviewRequestBuilder.build();
|
||||
mCaptureSession.setRepeatingRequest(mPreviewRequest,
|
||||
mCaptureCallback, mBackgroundHandler);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
|
||||
Activity activity = getActivity();
|
||||
if (null != activity) {
|
||||
Toast.makeText(activity, "Failed", Toast.LENGTH_SHORT).show();
|
||||
}
|
||||
}
|
||||
}, null
|
||||
);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
|
||||
* This method should be called after the camera preview size is determined in
|
||||
* setUpCameraOutputs and also the size of `mTextureView` is fixed.
|
||||
*
|
||||
* @param viewWidth The width of `mTextureView`
|
||||
* @param viewHeight The height of `mTextureView`
|
||||
*/
|
||||
private void configureTransform(int viewWidth, int viewHeight) {
|
||||
Activity activity = getActivity();
|
||||
if (null == mTextureView || null == mPreviewSize || null == activity) {
|
||||
return;
|
||||
}
|
||||
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
|
||||
Matrix matrix = new Matrix();
|
||||
RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
|
||||
RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
|
||||
float centerX = viewRect.centerX();
|
||||
float centerY = viewRect.centerY();
|
||||
if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
|
||||
bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
|
||||
matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
|
||||
float scale = Math.max(
|
||||
(float) viewHeight / mPreviewSize.getHeight(),
|
||||
(float) viewWidth / mPreviewSize.getWidth());
|
||||
matrix.postScale(scale, scale, centerX, centerY);
|
||||
matrix.postRotate(90 * (rotation - 2), centerX, centerY);
|
||||
}
|
||||
mTextureView.setTransform(matrix);
|
||||
}
|
||||
|
||||
/**
|
||||
* Initiate a still image capture.
|
||||
*/
|
||||
private void takePicture() {
|
||||
lockFocus();
|
||||
}
|
||||
|
||||
/**
|
||||
* Lock the focus as the first step for a still image capture.
|
||||
*/
|
||||
private void lockFocus() {
|
||||
try {
|
||||
// This is how to tell the camera to lock focus.
|
||||
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
|
||||
CameraMetadata.CONTROL_AF_TRIGGER_START);
|
||||
// Tell #mCaptureCallback to wait for the lock.
|
||||
mState = STATE_WAITING_LOCK;
|
||||
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), mCaptureCallback,
|
||||
mBackgroundHandler);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Run the precapture sequence for capturing a still image. This method should be called when we
|
||||
* get a response in {@link #mCaptureCallback} from {@link #lockFocus()}.
|
||||
*/
|
||||
private void runPrecaptureSequence() {
|
||||
try {
|
||||
// This is how to tell the camera to trigger.
|
||||
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
|
||||
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START);
|
||||
// Tell #mCaptureCallback to wait for the precapture sequence to be set.
|
||||
mState = STATE_WAITING_PRECAPTURE;
|
||||
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
|
||||
mBackgroundHandler);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Capture a still picture. This method should be called when we get a response in
|
||||
* {@link #mCaptureCallback} from both {@link #lockFocus()}.
|
||||
*/
|
||||
private void captureStillPicture() {
|
||||
try {
|
||||
final Activity activity = getActivity();
|
||||
if (null == activity || null == mCameraDevice) {
|
||||
return;
|
||||
}
|
||||
// This is the CaptureRequest.Builder that we use to take a picture.
|
||||
final CaptureRequest.Builder captureBuilder =
|
||||
mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
|
||||
captureBuilder.addTarget(mImageReader.getSurface());
|
||||
|
||||
// Use the same AE and AF modes as the preview.
|
||||
captureBuilder.set(CaptureRequest.CONTROL_AF_MODE,
|
||||
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
|
||||
captureBuilder.set(CaptureRequest.CONTROL_AE_MODE,
|
||||
CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
|
||||
|
||||
// Orientation
|
||||
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
|
||||
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
|
||||
|
||||
CameraCaptureSession.CaptureCallback CaptureCallback
|
||||
= new CameraCaptureSession.CaptureCallback() {
|
||||
|
||||
@Override
|
||||
public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request,
|
||||
TotalCaptureResult result) {
|
||||
Toast.makeText(getActivity(), "Saved: " + mFile, Toast.LENGTH_SHORT).show();
|
||||
unlockFocus();
|
||||
}
|
||||
};
|
||||
|
||||
mCaptureSession.stopRepeating();
|
||||
mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Unlock the focus. This method should be called when still image capture sequence is finished.
|
||||
*/
|
||||
private void unlockFocus() {
|
||||
try {
|
||||
// Reset the autofucos trigger
|
||||
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
|
||||
CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
|
||||
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
|
||||
CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
|
||||
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
|
||||
mBackgroundHandler);
|
||||
// After this, the camera will go back to the normal state of preview.
|
||||
mState = STATE_PREVIEW;
|
||||
mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback,
|
||||
mBackgroundHandler);
|
||||
} catch (CameraAccessException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void onClick(View view) {
|
||||
switch (view.getId()) {
|
||||
case R.id.picture: {
|
||||
takePicture();
|
||||
break;
|
||||
}
|
||||
case R.id.info: {
|
||||
Activity activity = getActivity();
|
||||
if (null != activity) {
|
||||
new AlertDialog.Builder(activity)
|
||||
.setMessage(R.string.intro_message)
|
||||
.setPositiveButton(android.R.string.ok, null)
|
||||
.show();
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Saves a JPEG {@link Image} into the specified {@link File}.
|
||||
*/
|
||||
private static class ImageSaver implements Runnable {
|
||||
|
||||
/**
|
||||
* The JPEG image
|
||||
*/
|
||||
private final Image mImage;
|
||||
/**
|
||||
* The file we save the image into.
|
||||
*/
|
||||
private final File mFile;
|
||||
|
||||
public ImageSaver(Image image, File file) {
|
||||
mImage = image;
|
||||
mFile = file;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void run() {
|
||||
ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();
|
||||
byte[] bytes = new byte[buffer.remaining()];
|
||||
buffer.get(bytes);
|
||||
FileOutputStream output = null;
|
||||
try {
|
||||
output = new FileOutputStream(mFile);
|
||||
output.write(bytes);
|
||||
} catch (FileNotFoundException e) {
|
||||
e.printStackTrace();
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
} finally {
|
||||
mImage.close();
|
||||
if (null != output) {
|
||||
try {
|
||||
output.close();
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Compares two {@code Size}s based on their areas.
|
||||
*/
|
||||
static class CompareSizesByArea implements Comparator<Size> {
|
||||
|
||||
@Override
|
||||
public int compare(Size lhs, Size rhs) {
|
||||
// We cast here to ensure the multiplications won't overflow
|
||||
return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
|
||||
(long) rhs.getWidth() * rhs.getHeight());
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
public static class ErrorDialog extends DialogFragment {
|
||||
|
||||
@Override
|
||||
public Dialog onCreateDialog(Bundle savedInstanceState) {
|
||||
final Activity activity = getActivity();
|
||||
return new AlertDialog.Builder(activity)
|
||||
.setMessage("This device doesn't support Camera2 API.")
|
||||
.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
|
||||
@Override
|
||||
public void onClick(DialogInterface dialogInterface, int i) {
|
||||
activity.finish();
|
||||
}
|
||||
})
|
||||
.create();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,35 @@
|
||||
/*
|
||||
* Copyright 2014 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package com.example.android.camera2basic;
|
||||
|
||||
import android.app.Activity;
|
||||
import android.os.Bundle;
|
||||
|
||||
public class CameraActivity extends Activity {
|
||||
|
||||
@Override
|
||||
protected void onCreate(Bundle savedInstanceState) {
|
||||
super.onCreate(savedInstanceState);
|
||||
setContentView(R.layout.activity_camera);
|
||||
if (null == savedInstanceState) {
|
||||
getFragmentManager().beginTransaction()
|
||||
.replace(R.id.container, Camera2BasicFragment.newInstance())
|
||||
.commit();
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user