Android编程开发之seekBar采用handler消息处理操作的方法

本文实例讲述了Android编程开发之seekBar采用handler消息处理操作的方法。分享给大家供大家参考，具体如下：

该案例简单实现进度条可走，可拖拽的功能，下面请看源码：

布局文件：

java文件：

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);
 
  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;
 }
}

效果图（自动走）：

希望本文所述对大家Android程序设计有所帮助。