Android旋转动画

Question

我有一个三角形，每次用户点击屏幕时我都想旋转120度。我有三个旋转动画，从0-120,120-240和240-360度。

旋转1：

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android" 
    android:interpolator="@android:anim/linear_interpolator" 
    android:fillAfter="true"> 
    <rotate 
     android:duration="500" 
     android:pivotX="50%" 
     android:pivotY="50%" 
     android:repeatCount="0" 
     android:startOffset="0" 
     android:fromDegrees="0" 
     android:toDegrees="120" 
     /> 
</set> 

在我的MainActivity的网页我有：

import android.app.Activity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.animation.Animation; 
import android.view.animation.AnimationUtils; 

public class StartPage2 extends Activity { 

    Animation rotate1; 
    Animation rotate2; 
    Animation rotate3; 
    View triangle2; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.start_page_two); 

     rotate1 = AnimationUtils.loadAnimation(this, R.anim.rotate1); 
     rotate2 = AnimationUtils.loadAnimation(this, R.anim.rotate2); 
     rotate3 = AnimationUtils.loadAnimation(this, R.anim.rotate3); 
     triangle2 = (View) findViewById(R.id.triangle2); 
    } 

    public boolean onTouchEvent(MotionEvent event) { 
     if (event.getAction() == MotionEvent.ACTION_DOWN) { 

      triangle2.startAnimation(rotate2); 

      return true; 
     } 
     return super.onTouchEvent(event); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 
} 

Answer 1

使用此

import android.app.Activity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.animation.Animation; 
import android.view.animation.AnimationUtils; 

public class StartPage2 extends Activity { 

    Animation rotate1; 
    Animation rotate2; 
    Animation rotate3; 
    View triangle2; 
    int currentAnimation = 0; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.start_page_two); 

     rotate1 = AnimationUtils.loadAnimation(this, R.anim.rotate1); 
     rotate2 = AnimationUtils.loadAnimation(this, R.anim.rotate2); 
     rotate3 = AnimationUtils.loadAnimation(this, R.anim.rotate3); 
     triangle2 = (View) findViewById(R.id.triangle2); 
    } 

    public boolean onTouchEvent(MotionEvent event) { 
     if (event.getAction() == MotionEvent.ACTION_DOWN) { 

      switch(++currentAnimation){ 
       case 1: 
       triagnle2.startAnimation(rotate1); 
       break; 
       case 2: 
       triagnle2.startAnimation(rotate2); 
       break; 
       case 3: 
       currentAnimation = 0; 
       triagnle2.startAnimation(rotate3); 
       break; 
      } 

      return true; 
     } 
     return super.onTouchEvent(event); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 
} 

，考虑你的变量前使用private