Android实现仿美团、顺丰快递数据加载效果

<?xml version="1.0" encoding="utf-8"?> 
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" 
 android:oneshot="false" > 
 <item 
  android:drawable="@drawable/app_loading0" 
  android:duration="150"/> 
 <item 
  android:drawable="@drawable/app_loading1" 
  android:duration="150"/> 
</animation-list> 

/** 
 * @Description:自定义对话框 
 * @author http://blog.csdn.net/finddreams 
 */ 
public class CustomProgressDialog extends ProgressDialog { 
 private AnimationDrawable mAnimation; 
 private Context mContext; 
 private ImageView mImageView; 
 private String mLoadingTip; 
 private TextView mLoadingTv; 
 private int count = 0; 
 private String oldLoadingTip; 
 private int mResid; 
 public CustomProgressDialog(Context context, String content, int id) { 
  super(context); 
  this.mContext = context; 
  this.mLoadingTip = content; 
  this.mResid = id; 
  setCanceledOnTouchOutside(true); 
 } 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  initView(); 
  initData(); 
 } 
 private void initData() { 
  mImageView.setBackgroundResource(mResid); 
  // 通过ImageView对象拿到背景显示的AnimationDrawable 
  mAnimation = (AnimationDrawable) mImageView.getBackground(); 
  // 为了防止在onCreate方法中只显示第一帧的解决方案之一 
  mImageView.post(new Runnable() { 
   @Override 
   public void run() { 
    mAnimation.start(); 
   } 
  }); 
  mLoadingTv.setText(mLoadingTip); 
 } 
 public void setContent(String str) { 
  mLoadingTv.setText(str); 
 } 
 private void initView() { 
  setContentView(R.layout.progress_dialog); 
  mLoadingTv = (TextView) findViewById(R.id.loadingTv); 
  mImageView = (ImageView) findViewById(R.id.loadingIv); 
 } 
} 

@Override 
 public void onWindowFocusChanged(boolean hasFocus) { 
  // TODO Auto-generated method stub 
  mAnimation.start(); 
  super.onWindowFocusChanged(hasFocus); 
 } 

CustomProgressDialog dialog =new CustomProgressDialog(this, "正在加载中",R.anim.frame); 
  dialog.show();