为什么逐帧动画无法正常工作？

我想展示一只跳跃的小鸟。我有不同位置的那只鸟的不同图像。我为此使用了逐帧动画。它没有找到运行时异常资源。为什么逐帧动画无法正常工作？

这里是我的代码

public class AnimationDrawableActivity extends Activity { 

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

     im=(ImageView)findViewById(R.id.imageView_hostanimation); 
     im.setBackgroundResource(R.drawable.spain_animation); 
     AnimationDrawable frameAnimation = (AnimationDrawable) im.getBackground(); 
     frameAnimation.setCallback(im); 
     frameAnimation.setVisible(true, true); 

     frameAnimation.start(); 
    } 
}

在绘制-mdpi->我的XML文件spain_animation.xml

<?xml version="1.0" encoding="utf-8"?> 
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android" > 

    <animation-list 
     android:id="@+id/testanimation" android:oneshot="false" > 

     <item 
      android:drawable="@drawable/icon" android:duration="150"/> 
     <item 
      android:drawable="@drawable/pokeslidebird1" android:duration="150"/> 
     <item 
      android:drawable="@drawable/pokeslidebird2" android:duration="150"/> 
     <item 
      android:drawable="@drawable/icon" android:duration="150"/> 
     <item 
      android:drawable="@drawable/pokeslidebird1" android:duration="150"/> 
     <item 
      android:drawable="@drawable/icon" android:duration="150"/> 
    </animation-list> 
</animated-rotate>

这里是布局 - > animation.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <RelativeLayout 
     android:id="@+id/relativeLayout1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentRight="true" 
     android:layout_alignParentTop="true" > 

     <ImageView 
      android:id="@+id/imageView_hostanimation" 
      android:layout_width="200dp" 
      android:layout_height="200dp" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentTop="true" 
      android:layout_marginLeft="56dp" 
      android:layout_marginTop="70dp" 
      android:src="@drawable/icon" > 
     </ImageView> 
    </RelativeLayout> 

</RelativeLayout>

请帮助我，我做错了什么？

这里是我的日志CAT->

11-23 12:45:35.070: ERROR/AndroidRuntime(517): Uncaught handler: thread main exiting due to uncaught exception 
11-23 12:45:35.100: ERROR/AndroidRuntime(517): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.a3.activity/com.a3.activity.AnimationDrawableActivity}: android.content.res.Resources$NotFoundException: File res/drawable-mdpi/spain_animation.xml from drawable resource ID #0x7f020003 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.os.Looper.loop(Looper.java:123) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at java.lang.reflect.Method.invoke(Method.java:521) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at dalvik.system.NativeStart.main(Native Method) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517): Caused by: android.content.res.Resources$NotFoundException: File res/drawable-mdpi/spain_animation.xml from drawable resource ID #0x7f020003 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.content.res.Resources.loadDrawable(Resources.java:1693) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.content.res.Resources.getDrawable(Resources.java:580) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.view.View.setBackgroundResource(View.java:7186) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at com.a3.activity.AnimationDrawableActivity.onCreate(AnimationDrawableActivity.java:17) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  ... 11 more 
11-23 12:45:35.100: ERROR/AndroidRuntime(517): Caused by: java.lang.NullPointerException 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.graphics.drawable.AnimatedRotateDrawable.inflate(AnimatedRotateDrawable.java:222) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:788) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.graphics.drawable.Drawable.createFromXml(Drawable.java:729) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  at android.content.res.Resources.loadDrawable(Resources.java:1690) 
11-23 12:45:35.100: ERROR/AndroidRuntime(517):  ... 16 more

来源

2011-11-23 picaso