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>