Android编程开发之seekBar采用handler消息处理操作的方法

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context=".MainActivity" >
 <SeekBar
  android:id="@+id/seekBar1"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_alignParentLeft="true"
  android:layout_alignParentTop="true" />
</RelativeLayout>

package com.example.lession16_seekbar;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.widget.SeekBar;
public class MainActivity extends Activity {
 private SeekBar seekBar;
 private static final int MAX_PROGRESS =100;
 private int current_progress=10;
 private static final int PRO=1;
 private Handler handler;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  seekBar = (SeekBar) this.findViewById(R.id.seekBar1);
  seekBar.setMax(MAX_PROGRESS);
 /* new Thread(new Runnable() {
   @Override
   public void run() {
    while(true){
     try {
      Thread.sleep(600);
      current_progress+=10;
      seekBar.setProgress(current_progress);
     } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
   }
  }).start();*/
  handler = new Handler(){
    @Override
   public void handleMessage(Message msg) {
    super.handleMessage(msg);
    switch (msg.what) {
    case PRO:
      if(current_progress>=MAX_PROGRESS){
      }else{
       current_progress+=1;
       seekBar.incrementProgressBy(1);
       handler.sendEmptyMessageDelayed(PRO, 600);
      }
     break;
    default:
     break;
    }
   }
  };
  current_progress=current_progress>0?current_progress:0;
  seekBar.setProgress(current_progress);
  handler.sendEmptyMessage(PRO);
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
}