1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 
17 package android.view;
18 
19 import com.android.frameworks.coretests.R;
20 
21 import android.app.Activity;
22 import android.os.Bundle;
23 import android.util.Log;
24 import android.util.TypedValue;
25 import android.view.MotionEvent;
26 import android.view.ScaleGestureDetector;
27 import android.view.ScaleGestureDetector.SimpleOnScaleGestureListener;
28 import android.widget.TextView;
29 
30 public class ScaleGesture extends Activity {
31     private ScaleGestureDetector mScaleGestureDetector;
32     private float mFactor;
33     @Override
onCreate(Bundle savedInstanceState)34     protected void onCreate(Bundle savedInstanceState) {
35         super.onCreate(savedInstanceState);
36         setContentView(R.layout.scale_gesture);
37         mScaleGestureDetector = new ScaleGestureDetector(this, new OnScaleGestureListener());
38         mFactor = 1.0f;
39     }
40 
getScaleFactor()41     public float getScaleFactor() {
42         return mFactor;
43     }
44 
45     @Override
onTouchEvent(MotionEvent event)46     public boolean onTouchEvent(MotionEvent event) {
47         mScaleGestureDetector.onTouchEvent(event);
48         return true;
49     }
50 
51     public class OnScaleGestureListener extends SimpleOnScaleGestureListener {
52         @Override
onScale(ScaleGestureDetector detector)53         public boolean onScale(ScaleGestureDetector detector) {
54             mFactor *= detector.getScaleFactor();
55             return true;
56         }
57     }
58 }
59