1 /*
2  * Copyright (C) 2013 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 com.example.android.livebutton;
18 
19 import android.app.Activity;
20 import android.os.Bundle;
21 import android.view.MotionEvent;
22 import android.view.View;
23 import android.view.animation.DecelerateInterpolator;
24 import android.view.animation.OvershootInterpolator;
25 import android.widget.Button;
26 
27 /**
28  * This app shows a simple application of anticipation and follow-through techniques as
29  * the button animates into its pressed state and animates back out of it, overshooting
30  * end state before resolving.
31  *
32  * Watch the associated video for this demo on the DevBytes channel of developer.android.com
33  * or on the DevBytes playlist in the androiddevelopers channel on YouTube at
34  * https://www.youtube.com/playlist?list=PLWz5rJ2EKKc_XOgcRukSoKKjewFJZrKV0.
35  */
36 public class LiveButton extends Activity {
37 
38     DecelerateInterpolator sDecelerator = new DecelerateInterpolator();
39     OvershootInterpolator sOvershooter = new OvershootInterpolator(10f);
40 
41     @Override
onCreate(Bundle savedInstanceState)42     protected void onCreate(Bundle savedInstanceState) {
43         super.onCreate(savedInstanceState);
44         setContentView(R.layout.activity_overshoot);
45 
46         final Button clickMeButton = (Button) findViewById(R.id.clickMe);
47         clickMeButton.animate().setDuration(200);
48 
49         clickMeButton.setOnTouchListener(new View.OnTouchListener() {
50 
51             @Override
52             public boolean onTouch(View arg0, MotionEvent arg1) {
53                 if (arg1.getAction() == MotionEvent.ACTION_DOWN) {
54                     clickMeButton.animate().setInterpolator(sDecelerator).
55                             scaleX(.7f).scaleY(.7f);
56                 } else if (arg1.getAction() == MotionEvent.ACTION_UP) {
57                     clickMeButton.animate().setInterpolator(sOvershooter).
58                             scaleX(1f).scaleY(1f);
59                 }
60                 return false;
61             }
62         });
63 
64     }
65 }
66