进度条（Progressbar）

//进度条
public class ProgressBarActivity extends Activity {

    private ProgressBar progressBarDefaultStyle1;
    private ProgressBar progressBarDefaultStyle2;
    private Button button;
    
    private Handler handler = new Handler(){
        public void handleMessage(Message msg) {
            int flag = msg.arg1;
            if(flag <= 100){
                progressBarDefaultStyle1.setProgress(flag);
            }
            if (flag <= 200) {
                progressBarDefaultStyle2.setProgress(flag/2);
                
            }
            if (flag==201){
                progressBarDefaultStyle1.setProgress(0);
                progressBarDefaultStyle2.setProgress(0);
                button.setEnabled(true);
                timerTask.cancel();
            }
        }
    };
    private Timer timer = new Timer();
    private SendMsgTimerTask timerTask = new SendMsgTimerTask();
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.progress_bar);
        
        progressBarDefaultStyle1 = (ProgressBar)findViewById(R.id.progressBarDefaultStyle1Id);
        progressBarDefaultStyle2 = (ProgressBar)findViewById(R.id.progressBarDefaultStyle2Id);
        button = (Button) findViewById(R.id.buttonId);
        
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                button.setEnabled(false);
                timer.schedule(timerTask, 5, 100);
            }
        });
        
    }
    
    class SendMsgTimerTask extends TimerTask{
        int flag = 0;
        public void run() {
            Message msg = new Message();
            msg.arg1 = ++flag;
            handler.sendMessage(msg);
            Log.i("msg.arg1", "发消息:"+msg.arg1);
        }
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        timer.cancel();
    }
    
}

<?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="match_parent"
    android:padding="5dp" >

    <!-- 定义一个普通大小的环形进度条 -->

    <ProgressBar
        android:id="@+id/progressBarInverseStyleId"
        style="@android:style/Widget.ProgressBar.Inverse"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <!-- 定义一个大环形进度条 -->

    <ProgressBar
        android:id="@+id/progressBarLargeStyleId"
        style="@android:style/Widget.ProgressBar.Large"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarInverseStyleId" />

    <!-- 定义一个大环形进度条 -->

    <ProgressBar
        android:id="@+id/progressBarLargeInverseStyleId"
        style="@android:style/Widget.ProgressBar.Large.Inverse"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarLargeStyleId" />

    <!-- 定义一个小环形进度条 -->

    <ProgressBar
        android:id="@+id/progressBarSmallStyleId"
        style="@android:style/Widget.ProgressBar.Small"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarLargeInverseStyleId" />

    <!-- 定义一个小环形进度条 -->
    <ProgressBar
        android:id="@+id/progressBarSmallInverseStyleId"
        style="@android:style/Widget.ProgressBar.Small.Inverse"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarSmallStyleId" />

    <!-- 定义一个默认样式的水平进度条 -->
    <ProgressBar
        android:id="@+id/progressBarDefaultStyle1Id"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarSmallInverseStyleId"
        android:max="100" />

    <!-- 定义一个指定样式的水平进度条 -->
    <!-- bar_state是一个图片状态文件 -->
    <ProgressBar
        android:id="@+id/progressBarDefaultStyle2Id"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarDefaultStyle1Id"
        android:max="100"
        android:progressDrawable="@drawable/bar_state" />

    <Button
        android:id="@+id/buttonId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/progressBarDefaultStyle2Id"
        android:text="模拟耗时操作" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 定义轨道的背景 -->
    <item android:id="@android:id/background" android:drawable="@drawable/no"/>
    <!-- 定义轨道的成功图像 -->
    <item android:id="@android:id/progress" android:drawable="@drawable/yes"/>
</layer-list>