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      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
     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