Android自定义加载控件实现数据加载动画

package com.*****.*****.widget;
 
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
 
 
 
 
/**
 * Created by Xiaomu
 * 数据加载控件
 */
public class LoadingView extends RelativeLayout {
  private Context mContext;
  private ImageView loadingIv;
  private TextView loadingTv;
 
  public LoadingView(Context context) {
    super(context);
    this.mContext = context;
    initView();
  }
 
  public LoadingView(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.mContext = context;
    initView();
  }
 
  private void initView() {
    View view = LayoutInflater.from(mContext).inflate(R.layout.loading, null);
 
    loadingIv = (ImageView) view.findViewById(R.id.loadingIv);
    loadingTv = (TextView) view.findViewById(R.id.loadingTv);
 
    AnimationDrawable animationDrawable = (AnimationDrawable) loadingIv.getBackground();
    if (animationDrawable != null)
      animationDrawable.start();
 
    addView(view);
  }
 
  public ImageView getLoadingIv() {
    return loadingIv;
  }
 
  public TextView getLoadingTv() {
    return loadingTv;
  }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
 
  <ImageView
    android:id="@+id/loadingIv"
    android:layout_width="@dimen/dimen_144_dip"
    android:layout_height="@dimen/dimen_162_dip"
    android:layout_centerHorizontal="true"
    android:background="@anim/loading_anim" />
 
  <TextView
    android:id="@+id/loadingTv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/loadingIv"
    android:layout_centerHorizontal="true"
    android:gravity="center_horizontal"
    android:text="正在加载中..."
    android:textSize="15sp" />
 
</RelativeLayout>

<?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/progress_loading_image_01"
    android:duration="150" />
  <item
    android:drawable="@drawable/progress_loading_image_02"
    android:duration="150" />
</animation-list>