Androidの多线程之更新ui（Thread+Handler+Message）

流程：

1.点击开始，显示进度对话框，启动线程，循环发送消息（1-100）

2.更新对话框中的进度，和标题栏的进度

3.到达最大进度值时，关闭对话框，标题栏显示更新完成

解析：

1.在主线程处理handler的消息，更新Ui

2.在其他线程里用主线程的handler不停发送消息

3.线程启动，发送消息

package com.bvin.thread;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;

public class MainrActivity extends Activity {
    /** Called when the activity is first created. */
    private Handler handler;
    private ProgressDialog dialog;
    
    private TextView tv;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
        setContentView(R.layout.main);
        setSecondaryProgress(10000); //设置副进度为10000
        handler = new Handler(){

            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                super.handleMessage(msg);
                Log.e("progress:", ""+msg.what);
                setTitle("更新--"+msg.what);
                setProgress(msg.what*100);
                if(msg.what==100){
                    setProgressBarVisibility(false); // 执行完后使进度条隐藏
                    dialog.dismiss();
                    setTitle("更新完成");
                }
            }
            
            
        };
        initViews();
        
    }
    
    private void initViews(){
        
        dialog= new ProgressDialog(MainrActivity.this);
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        dialog.setMax(100);
        Button bt = (Button)findViewById(R.id.bt);
        bt.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                setProgressBarVisibility(true);
                dialog.show();
                exec();
            }
        });
        
        tv  = (TextView)findViewById(R.id.tv);
        
        
        
    }
    
    private void exec(){
        
        new Thread(new Runnable(){

            @Override
            public void run() {
                // TODO Auto-generated method stub
                for(int i=0;i<=100;i++){
                    
                    handler.sendEmptyMessage(i);
                }
            }
            
            
        }).start();
    }
}