android 仿淘宝的加载刷新效果

自定义view：

package com.taobao.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class TBProgressBar extends RelativeLayout {
  
  public TBProgressBar(Context context) {
    super(context);
    initView(context);
  }
  
  public TBProgressBar(Context context, AttributeSet attrs) {
    super(context, attrs);
    initView(context);
  }

  private void initView(Context context) {
    
    ImageView round = new ImageView(context);
    round.setImageResource(R.drawable.loading);
    addView(round, new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
    
    LinearInterpolator li = new LinearInterpolator();
        Animation animation = AnimationUtils.loadAnimation(context, R.anim.tb);
        animation.setInterpolator(li);
        round.startAnimation(animation);
  }

}

相关的图片：

load_bk.png

loading.png

anim文件下面的tb.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <rotate
        android:duration="800"
        android:fromDegrees="0.0"
        android:pivotX="50.0%"
        android:pivotY="50.0%"
        android:repeatCount="-1"
        android:toDegrees="+360.0" />

</set>

其他知识：

步骤:

• 用任何图片编辑器编辑一张ProgressBar需要的图片
• 用这张图片创建一个animation drawable

<?xml version="1.0" encoding="utf-8"?>
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/image_for_rotation"
android:pivotX="50%"
android:pivotY="50%" />

   @drawable/image_for_rotation

 就是那张做好的图片

给ProgressBar widget设定android:indeterminateDrawable

<?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:gravity="center">
<ProgressBar
android:indeterminateDrawable="@drawable/my_progress_indeterminate"
android:layout_height="100dp" android:layout_width="100dp"/>
</LinearLayout>

It is very easy!  ​​这里​​

 you can download Sample project with custom Android ProgressBar.