Android 启动界面的实现（转载）

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package wht.android.loading;   import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.widget.ImageView;   public class LoadingView extends ImageView implements Runnable {         private boolean isStop = false;                   private int[] imageIds;         private int index = 0;         private int length = 1;                   public LoadingView(Context context)         {                 this(context, null);         }           public LoadingView(Context context, AttributeSet attrs)         {                 super(context, attrs);         }                   public void setImageIds(int[] imageId)         {                 this.imageIds = imageId;                 if(imageIds != null && imageIds.length > 0)                 {                         length = imageIds.length;                 }         }                           @Override         protected void onDetachedFromWindow()         {                 // TODO Auto-generated method stub                 super.onDetachedFromWindow();                 isStop = true;         }           @Override         protected void onDraw(Canvas canvas)         {                 // TODO Auto-generated method stub                 super.onDraw(canvas);                 if(imageIds != null && imageIds.length > 0)                 {                         this.setImageResource(imageIds[index]);                 }         }           @Override         public void run()         {                 while(!isStop)                 {                         index = ++index % length;                         postInvalidate();                         try                         {                                 Thread.sleep(400);                         }                         catch (InterruptedException e)                         {                                 e.printStackTrace();                         }                 }         }                   public void startAnim()         {                 new Thread(this).start();         }   }

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package wht.android.loading;   import android.app.Activity; import android.os.Bundle;   public class MainActivity extends Activity {           private LoadingView main_imageview;           @Override     public void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         main_imageview = (LoadingView)findViewById(R.id.main_imageview);         initLoadingImages();                   new Thread()         {             @Override             public void run()             {                 main_imageview.startAnim();             }         }.start();               }           private void initLoadingImages()     {         int[] imageIds = new int[6];         imageIds[0] = R.drawable.loader_frame_1;         imageIds[1] = R.drawable.loader_frame_2;         imageIds[2] = R.drawable.loader_frame_3;         imageIds[3] = R.drawable.loader_frame_4;         imageIds[4] = R.drawable.loader_frame_5;         imageIds[5] = R.drawable.loader_frame_6;                   main_imageview.setImageIds(imageIds);     } }

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"         android:orientation="vertical" android:layout_width="fill_parent"         android:layout_height="fill_parent" android:background="#e1e1e1">         <wht.android.loading.LoadingView                 android:layout_gravity="center_horizontal" android:layout_height="wrap_content"                 android:id="@+id/main_imageview" android:src="@drawable/loader_frame_1"                 android:layout_marginTop="190dp" android:layout_width="wrap_content"                 ></wht.android.loading.LoadingView>   <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="启动中..."         android:layout_marginTop="10dip"         android:textColor="#666666"         android:layout_gravity="center_horizontal"         android:textSize="20sp" /> </LinearLayout>