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
1 package com.bvin.thread; 2 3 import android.app.Activity; 4 import android.app.ProgressDialog; 5 import android.os.Bundle; 6 import android.os.Handler; 7 import android.os.Message; 8 import android.util.Log; 9 import android.view.View; 10 import android.view.Window; 11 import android.widget.Button; 12 import android.widget.TextView; 13 14 public class MainrActivity extends Activity { 15 /** Called when the activity is first created. */ 16 private Handler handler; 17 private ProgressDialog dialog; 18 19 private TextView tv; 20 21 @Override 22 public void onCreate(Bundle savedInstanceState) { 23 super.onCreate(savedInstanceState); 24 this.getWindow().requestFeature(Window.FEATURE_PROGRESS); 25 setContentView(R.layout.main); 26 setSecondaryProgress(10000); //设置副进度为10000 27 handler = new Handler(){ 28 29 @Override 30 public void handleMessage(Message msg) { 31 // TODO Auto-generated method stub 32 super.handleMessage(msg); 33 Log.e("progress:", ""+msg.what); 34 setTitle("更新--"+msg.what); 35 setProgress(msg.what*100); 36 if(msg.what==100){ 37 setProgressBarVisibility(false); // 执行完后使进度条隐藏 38 dialog.dismiss(); 39 setTitle("更新完成"); 40 } 41 } 42 43 44 }; 45 initViews(); 46 47 } 48 49 private void initViews(){ 50 51 dialog= new ProgressDialog(MainrActivity.this); 52 dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 53 dialog.setMax(100); 54 Button bt = (Button)findViewById(R.id.bt); 55 bt.setOnClickListener(new View.OnClickListener() { 56 57 @Override 58 public void onClick(View v) { 59 // TODO Auto-generated method stub 60 setProgressBarVisibility(true); 61 dialog.show(); 62 exec(); 63 } 64 }); 65 66 tv = (TextView)findViewById(R.id.tv); 67 68 69 70 } 71 72 private void exec(){ 73 74 new Thread(new Runnable(){ 75 76 @Override 77 public void run() { 78 // TODO Auto-generated method stub 79 for(int i=0;i<=100;i++){ 80 81 handler.sendEmptyMessage(i); 82 } 83 } 84 85 86 }).start(); 87 } 88 }