Adding CrossCompatibility sample app.
Change-Id: I565584ea53212f61a9fbbb44e50da59f4ba06fff
This commit is contained in:
Megha Joshi
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/*
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* Copyright (C) 2010 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.touchexample;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.ViewGroup;
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public class TouchExampleActivity extends Activity {
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/** Called when the activity is first created. */
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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TouchExampleView view = new TouchExampleView(this);
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view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT));
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setContentView(view);
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}
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}
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/*
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* Copyright (C) 2010 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.touchexample;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.drawable.Drawable;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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public class TouchExampleView extends View {
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private Drawable mIcon;
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private float mPosX;
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private float mPosY;
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private VersionedGestureDetector mDetector;
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private float mScaleFactor = 1.f;
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public TouchExampleView(Context context) {
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this(context, null, 0);
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}
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public TouchExampleView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public TouchExampleView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mIcon = context.getResources().getDrawable(R.drawable.icon);
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mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(), mIcon.getIntrinsicHeight());
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mDetector = VersionedGestureDetector.newInstance(context, new GestureCallback());
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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mDetector.onTouchEvent(ev);
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return true;
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}
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@Override
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public void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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canvas.save();
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canvas.translate(mPosX, mPosY);
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canvas.scale(mScaleFactor, mScaleFactor);
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mIcon.draw(canvas);
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canvas.restore();
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}
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private class GestureCallback implements VersionedGestureDetector.OnGestureListener {
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public void onDrag(float dx, float dy) {
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mPosX += dx;
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mPosY += dy;
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invalidate();
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}
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public void onScale(float scaleFactor) {
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mScaleFactor *= scaleFactor;
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// Don't let the object get too small or too large.
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mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
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invalidate();
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}
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}
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}
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@@ -0,0 +1,165 @@
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/*
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* Copyright (C) 2010 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.touchexample;
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import android.content.Context;
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import android.os.Build;
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import android.util.Log;
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import android.view.MotionEvent;
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import android.view.ScaleGestureDetector;
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public abstract class VersionedGestureDetector {
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private static final String TAG = "VersionedGestureDetector";
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OnGestureListener mListener;
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public static VersionedGestureDetector newInstance(Context context,
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OnGestureListener listener) {
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final int sdkVersion = Integer.parseInt(Build.VERSION.SDK);
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VersionedGestureDetector detector = null;
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if (sdkVersion < Build.VERSION_CODES.ECLAIR) {
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detector = new CupcakeDetector();
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} else if (sdkVersion < Build.VERSION_CODES.FROYO) {
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detector = new EclairDetector();
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} else {
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detector = new FroyoDetector(context);
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}
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Log.d(TAG, "Created new " + detector.getClass());
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detector.mListener = listener;
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return detector;
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}
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public abstract boolean onTouchEvent(MotionEvent ev);
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public interface OnGestureListener {
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public void onDrag(float dx, float dy);
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public void onScale(float scaleFactor);
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}
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private static class CupcakeDetector extends VersionedGestureDetector {
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float mLastTouchX;
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float mLastTouchY;
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float getActiveX(MotionEvent ev) {
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return ev.getX();
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}
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float getActiveY(MotionEvent ev) {
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return ev.getY();
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}
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boolean shouldDrag() {
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return true;
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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switch (ev.getAction()) {
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case MotionEvent.ACTION_DOWN: {
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mLastTouchX = getActiveX(ev);
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mLastTouchY = getActiveY(ev);
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break;
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}
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case MotionEvent.ACTION_MOVE: {
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final float x = getActiveX(ev);
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final float y = getActiveY(ev);
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if (shouldDrag()) {
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mListener.onDrag(x - mLastTouchX, y - mLastTouchY);
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}
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mLastTouchX = x;
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mLastTouchY = y;
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break;
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}
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}
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return true;
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}
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}
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private static class EclairDetector extends CupcakeDetector {
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private static final int INVALID_POINTER_ID = -1;
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private int mActivePointerId = INVALID_POINTER_ID;
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private int mActivePointerIndex = 0;
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@Override
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float getActiveX(MotionEvent ev) {
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return ev.getX(mActivePointerIndex);
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}
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@Override
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float getActiveY(MotionEvent ev) {
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return ev.getY(mActivePointerIndex);
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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final int action = ev.getAction();
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switch (action & MotionEvent.ACTION_MASK) {
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case MotionEvent.ACTION_DOWN:
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mActivePointerId = ev.getPointerId(0);
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break;
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case MotionEvent.ACTION_CANCEL:
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case MotionEvent.ACTION_UP:
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mActivePointerId = INVALID_POINTER_ID;
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break;
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case MotionEvent.ACTION_POINTER_UP:
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final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
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>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
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final int pointerId = ev.getPointerId(pointerIndex);
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if (pointerId == mActivePointerId) {
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// This was our active pointer going up. Choose a new
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// active pointer and adjust accordingly.
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final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
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mActivePointerId = ev.getPointerId(newPointerIndex);
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mLastTouchX = ev.getX(newPointerIndex);
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mLastTouchY = ev.getY(newPointerIndex);
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}
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break;
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}
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mActivePointerIndex = ev.findPointerIndex(mActivePointerId);
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return super.onTouchEvent(ev);
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}
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}
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private static class FroyoDetector extends EclairDetector {
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private ScaleGestureDetector mDetector;
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public FroyoDetector(Context context) {
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mDetector = new ScaleGestureDetector(context,
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new ScaleGestureDetector.SimpleOnScaleGestureListener() {
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@Override public boolean onScale(ScaleGestureDetector detector) {
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mListener.onScale(detector.getScaleFactor());
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return true;
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}
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});
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}
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@Override
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boolean shouldDrag() {
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return !mDetector.isInProgress();
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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mDetector.onTouchEvent(ev);
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return super.onTouchEvent(ev);
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}
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}
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}
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