先上图:

我们得自定义ProgressBar的样式

<span style="white-space:pre">	</span><style name="self_define_ProgressBar" parent="@android:style/Widget.ProgressBar.Horizontal"> //继承了android横向的ProgressBar的样式
  	    <item name="android:indeterminateOnly">false</item>
  	    <item name="android:progressDrawable">@drawable/self_define_progress</item>
  	</style>

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

	<item android:id="@android:id/background" >	//定义的是背景色
		<shape>
			<corners android:radius="5dip" />
			<gradient android:angle="270" android:centerColor="#efefef"
				android:centerY="0.75" android:endColor="#a3a3a3"
				android:startColor="#c7c7c7" />
		</shape>
	</item>

	<item android:id="@android:id/secondaryProgress">   //如果有2级进度，需要定义这一项,gradient定义的是渐变色，clip如果没有的话，进度条会充满整个Progessbar
		<clip>
			<shape>
				<corners android:radius="5dip" />
				<gradient android:angle="270" android:centerColor="#99CC99"
					android:centerY="0.75" android:endColor="#99CC99"
					android:startColor="#99CC99" />
			</shape>
		</clip>
	</item>

	<item android:id="@android:id/progress">  //这个是定义1级进度，如果1级进度比2级进度大且1级进度不透明，就可以覆盖掉2级进度
		<clip>
			<shape>
				<corners android:radius="5dip" />
				<gradient android:angle="270" android:centerColor="#4abbfd"
					android:centerY="0.75" android:endColor="#4abbfd"
					android:startColor="#4abbfd" />
			</shape>
		</clip>
	</item>

</layer-list>

在代码里这样使用：

	private ProgressBar mProgressBar;
	private Task mTask = new Task();
	private int mCount = 0;
	private Handler mHander = new MyHandler();
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		mProgressBar = (ProgressBar)findViewById(R.id.progress);
		Timer timer = new Timer();
		timer.schedule(mTask, 1000, 1000);
	}
	
	private class MyHandler extends Handler{

		@Override
		public void handleMessage(Message msg) {
			mCount += 10;
			mProgressBar.setProgress(mCount);
			super.handleMessage(msg);
		}
	}
	
	private class Task extends TimerTask{

		@Override
		public void run() {
			mHander.sendEmptyMessage(10);
		}
	}

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
        android:pivotX="50%" 
	android:pivotY="50%"
        android:fromDegrees="0" 
	android:toDegrees="360">
        
    <shape
            android:shape="ring"<span style="font-family:verdana, ms song, 宋体, Arial, 微软雅黑, Helvetica, sans-serif;color:#666666;"><span style="font-size: 14px; line-height: 18px;">  </span></span>            android:innerRadiusRatio="3"
            android:thicknessRatio="8"
            android:useLevel="false">

        <size
                android:width="37dip"
                android:height="37dip"
        />
        
        <gradient
                android:type="sweep"//type为sweep为环形转圈
                android:useLevel="false"
                android:startColor="#F7F7F7"
                android:centerColor="#F7F7F7"
                android:centerY="0.50"
                android:endColor="#B3B4B4"
        />
        
    </shape>
    
</rotate>