130 lines
5.1 KiB
Java
130 lines
5.1 KiB
Java
/*
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* Copyright 2015 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.basicpermissions;
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import com.example.android.basicpermissions.camera.CameraPreviewActivity;
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import android.Manifest;
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import android.app.Activity;
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import android.content.Intent;
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import android.content.pm.PackageManager;
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import android.os.Build;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Button;
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import android.widget.Toast;
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/**
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* Launcher Activity that demonstrates the use of runtime permissions for Android M.
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* This Activity requests permissions to access the camera
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* ({@link android.Manifest.permission#CAMERA})
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* when the 'Show Camera Preview' button is clicked to start {@link CameraPreviewActivity} once
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* the permission has been granted.
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* <p>
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* First, the status of the Camera permission is checked using {@link
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* Activity#checkSelfPermission(String)}.
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* If it has not been granted ({@link PackageManager#PERMISSION_GRANTED}), it is requested by
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* calling
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* {@link Activity#requestPermissions(String[], int)}. The result of the request is returned in
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* {@link Activity#onRequestPermissionsResult(int, String[], int[])}, which starts {@link
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* CameraPreviewActivity}
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* if the permission has been granted.
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*/
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public class MainActivity extends Activity {
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private static final int PERMISSION_REQUEST_CAMERA = 0;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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// Register a listener for the 'Show Camera Preview' button.
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Button b = (Button) findViewById(R.id.button_open_camera);
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b.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View view) {
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showCameraPreview();
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}
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});
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}
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@Override
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public void onRequestPermissionsResult(int requestCode, String[] permissions,
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int[] grantResults) {
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// BEGIN_INCLUDE(onRequestPermissionsResult)
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if (requestCode == PERMISSION_REQUEST_CAMERA) {
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// Request for camera permission.
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if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
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// Permission has been granted. Start camera preview Activity.
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Toast.makeText(this, "Camera permission was granted. Starting preview.",
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Toast.LENGTH_SHORT)
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.show();
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startCamera();
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} else {
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// Permission request was denied.
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Toast.makeText(this, "Camera permission request was denied.", Toast.LENGTH_SHORT)
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.show();
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}
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}
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// END_INCLUDE(onRequestPermissionsResult)
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}
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private void showCameraPreview() {
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// BEGIN_INCLUDE(startCamera)
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if (isMNC()) {
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// On Android M and above, need to check if permission has been granted at runtime.
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if (checkSelfPermission(Manifest.permission.CAMERA)
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== PackageManager.PERMISSION_GRANTED) {
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// Permission is available, start camera preview
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startCamera();
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Toast.makeText(this,
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"Camera permission has already been granted. Starting preview.",
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Toast.LENGTH_SHORT).show();
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} else {
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// Permission has not been granted and must be requested.
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Toast.makeText(this,
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"Permission is not available. Requesting camera permission.",
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Toast.LENGTH_SHORT).show();
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requestPermissions(new String[]{Manifest.permission.CAMERA},
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PERMISSION_REQUEST_CAMERA);
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}
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} else {
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/*
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Below Android M all permissions have already been grated at install time and do not
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need to verified or requested.
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If a permission has been disabled in the system settings, the API will return
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unavailable or empty data instead. */
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Toast.makeText(this,
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"Requested permissions are granted at install time below M and are always "
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+ "available at runtime.",
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Toast.LENGTH_SHORT).show();
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startCamera();
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}
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// END_INCLUDE(startCamera)
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}
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private void startCamera() {
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Intent intent = new Intent(this, CameraPreviewActivity.class);
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startActivity(intent);
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}
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public static boolean isMNC() {
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return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M;
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}
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}
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