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

animation_3.xml:

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:padding="10dip"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:clipToPadding="false">

     <TextView
         android:id="@+id/target"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:textSize="26sp"
         android:text="@string/animation_3_text"/>

     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginTop="20dip"
         android:layout_marginBottom="5dip"
         android:text="@string/animation_2_instructions" />

     <Spinner
         android:id="@+id/spinner"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />

 </LinearLayout>

Animation3.java:

 package com.example.android.apis.view;

 import com.example.android.apis.R;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.animation.AnimationUtils;
 import android.view.animation.Animation;
 import android.view.animation.TranslateAnimation;
 import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Spinner;

 public class Animation3 extends Activity implements AdapterView.OnItemSelectedListener {
     private static final String[] INTERPOLATORS = {
             "Accelerate", "Decelerate", "Accelerate/Decelerate",
             "Anticipate", "Overshoot", "Anticipate/Overshoot",
             "Bounce"
     };

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.animation_3);

         Spinner s = (Spinner) findViewById(R.id.spinner);
         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                 android.R.layout.simple_spinner_item, INTERPOLATORS);
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
         s.setAdapter(adapter);
         s.setOnItemSelectedListener(this);
     }

     public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
         final View target = findViewById(R.id.target);
         final View targetParent = (View) target.getParent();

         Animation a = new TranslateAnimation(0.0f,
                 targetParent.getWidth() - target.getWidth() - targetParent.getPaddingLeft() -
                 targetParent.getPaddingRight(), 0.0f, 0.0f);
         a.setDuration(1000);
         a.setStartOffset(300);
         a.setRepeatMode(Animation.RESTART);
         a.setRepeatCount(Animation.INFINITE);

         switch (position) {
             case 0:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.accelerate_interpolator));
                 break;
             case 1:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.decelerate_interpolator));
                 break;
             case 2:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.accelerate_decelerate_interpolator));
                 break;
             case 3:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.anticipate_interpolator));
                 break;
             case 4:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.overshoot_interpolator));
                 break;
             case 5:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.anticipate_overshoot_interpolator));
                 break;
             case 6:
                 a.setInterpolator(AnimationUtils.loadInterpolator(this,
                         android.R.anim.bounce_interpolator));
                 break;
         }

         target.startAnimation(a);
     }

     public void onNothingSelected(AdapterView<?> parent) {
     }
 }

效果如下，文字会根据不同的效果执行动画显示效果：