android中的简单animation(三)accelerate(加速),decelerate（减速）,anticipate，overshoot,bounce

animation_3.xml:

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:padding="10dip"
 5     android:layout_width="match_parent"
 6     android:layout_height="wrap_content"
 7     android:clipToPadding="false">
 8 
 9     <TextView
10         android:id="@+id/target"
11         android:layout_width="wrap_content"
12         android:layout_height="wrap_content"
13         android:textSize="26sp"
14         android:text="@string/animation_3_text"/>
15 
16     <TextView
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:layout_marginTop="20dip"
20         android:layout_marginBottom="5dip"
21         android:text="@string/animation_2_instructions" />
22 
23     <Spinner
24         android:id="@+id/spinner"
25         android:layout_width="match_parent"
26         android:layout_height="wrap_content" />
27 
28 </LinearLayout>

Animation3.java:

 1 package com.example.android.apis.view;
 2 
 3 import com.example.android.apis.R;
 4 
 5 import android.app.Activity;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.view.animation.AnimationUtils;
 9 import android.view.animation.Animation;
10 import android.view.animation.TranslateAnimation;
11 import android.widget.AdapterView;
12 import android.widget.ArrayAdapter;
13 import android.widget.Spinner;
14 
15 public class Animation3 extends Activity implements AdapterView.OnItemSelectedListener {
16     private static final String[] INTERPOLATORS = {
17             "Accelerate", "Decelerate", "Accelerate/Decelerate",
18             "Anticipate", "Overshoot", "Anticipate/Overshoot",
19             "Bounce"
20     };
21 
22     @Override
23     public void onCreate(Bundle savedInstanceState) {
24         super.onCreate(savedInstanceState);
25         setContentView(R.layout.animation_3);
26 
27         Spinner s = (Spinner) findViewById(R.id.spinner);
28         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
29                 android.R.layout.simple_spinner_item, INTERPOLATORS);
30         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
31         s.setAdapter(adapter);
32         s.setOnItemSelectedListener(this);
33     }
34 
35     public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
36         final View target = findViewById(R.id.target);
37         final View targetParent = (View) target.getParent();
38 
39         Animation a = new TranslateAnimation(0.0f,
40                 targetParent.getWidth() - target.getWidth() - targetParent.getPaddingLeft() -
41                 targetParent.getPaddingRight(), 0.0f, 0.0f);
42         a.setDuration(1000);
43         a.setStartOffset(300);
44         a.setRepeatMode(Animation.RESTART);
45         a.setRepeatCount(Animation.INFINITE);
46 
47         switch (position) {
48             case 0:
49                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
50                         android.R.anim.accelerate_interpolator));
51                 break;
52             case 1:
53                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
54                         android.R.anim.decelerate_interpolator));
55                 break;
56             case 2:
57                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
58                         android.R.anim.accelerate_decelerate_interpolator));
59                 break;
60             case 3:
61                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
62                         android.R.anim.anticipate_interpolator));
63                 break;
64             case 4:
65                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
66                         android.R.anim.overshoot_interpolator));
67                 break;
68             case 5:
69                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
70                         android.R.anim.anticipate_overshoot_interpolator));
71                 break;
72             case 6:
73                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
74                         android.R.anim.bounce_interpolator));
75                 break;
76         }
77 
78         target.startAnimation(a);
79     }
80 
81     public void onNothingSelected(AdapterView<?> parent) {
82     }
83 }

效果如下，文字会根据不同的效果执行动画显示效果：