怎么在Android应用中实现一个加载数据帧动画效果

<&#63;xml version="1.0" encoding="utf-8"&#63;>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <TextView
    android:id="@+id/textview"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_alignParentBottom="true"
    android:layout_margin="20dp"
    android:background="@drawable/animationtk"
    android:gravity="center"
    android:text="点击弹出动画"
    android:textColor="#fff"
    android:textSize="18dp" />
</RelativeLayout>

package cll.com.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**
 * @Description 奔跑小人的动画弹框，可以用作加载数据界面
 * 2017-4-3 http://blog.csdn.net/android_cll
 */
public class RuningManActivity extends Activity implements View.OnClickListener {
  private TextView textview;//点击按钮
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.ac_runing_man);
    initlayout();
  }
  /**
   * 实例化
   */
  private void initlayout() {
    textview = (TextView) findViewById(R.id.textview);
    textview.setOnClickListener(this);
  }
  /**
   * 显示美团进度对话框
   *
   * @param v
   */
  public void showmeidialog(View v) {
    CustomProgressDialog dialog = new CustomProgressDialog(this, "正在加载中......", R.anim.animation);
    dialog.setCanceledOnTouchOutside(false);//设置是否可以点击外部消失
    dialog.setCancelable(false);//设置是否可以按退回键取消
    dialog.show();
  }
  @Override
  public void onClick(View view) {
    switch (view.getId()) {
      case R.id.textview:
        showmeidialog(view);
        break;
    }
  }
}

package cll.com.myapplication;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;
/**
 * @Description:自定义加载数据弹框
 * @author 2017-4-3 http://blog.csdn.net/android_cll
 */
public class CustomProgressDialog extends ProgressDialog {
  private AnimationDrawable mAnimation;
  private ImageView mImageView;
  private String mLoadingTip;
  private TextView mLoadingTv;
  private int mResid;
  public CustomProgressDialog(Context context, String content, int id) {
   super(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);
  }
  private void initView() {
   setContentView(R.layout.progress_dialog);
   mLoadingTv = (TextView) findViewById(R.id.loadingTv);
   mImageView = (ImageView) findViewById(R.id.loadingIv);
  }
}

<&#63;xml version="1.0" encoding="utf-8"&#63;>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:orientation="vertical" >
  <ImageView
    android:id="@+id/loadingIv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@anim/animation"/>
  <TextView
    android:id="@+id/loadingTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
   android:layout_alignBottom="@+id/loadingIv"
   android:textColor="#fff"
   android:layout_centerHorizontal="true"
   android:textSize="20sp"
    android:text="正在加载中.." />
</RelativeLayout>

<&#63;xml version="1.0" encoding="utf-8"&#63;> 
<animation-list 
  android:oneshot="false"
  xmlns:android="http://schemas.android.com/apk/res/android" 
  >  
  <item android:drawable="@mipmap/progress_loading_image" android:duration="150"/>
   <item android:drawable="@mipmap/progress_loading_imagey" android:duration="150"/>
</animation-list>