Android线程实例讲解

   本文只是一个关于Android线程之间通信的例子，高手请自动略过。例子主要实现如下功能：进度条，音乐播放进度显示，图片的移动。

游戏部分源码:

LoadBar.java

1. package com.dance.mrljdx;  
2.  
3. import android.app.Activity;  
4. import android.content.Intent;  
5. import android.os.Bundle;  
6. import android.os.Handler;  
7. import android.os.Message;  
8. import android.util.DisplayMetrics;  
9. import android.util.Log;  
10. import android.widget.ProgressBar;  
11. import android.widget.TextView;  
12.  
13. public class LoadBar extends Activity {  
14.     /** Called when the activity is first created. */  
15.     TextView txview=null,txload=null;  
16.     ProgressBar pBar=null;  
17.     protected static final int stop=1;  
18.     protected static final int start=2;  
19.     int intCounter=1;  
20.     @Override  
21.     public void onCreate(Bundle savedInstanceState) {  
22.         super.onCreate(savedInstanceState);  
23.         setContentView(R.layout.loadbar);  
24.         //DisplayMetrics 获取屏幕信息  
25.         DisplayMetrics dm=new DisplayMetrics();  
26.         getWindowManager().getDefaultDisplay().getMetrics(dm);  
27.         int screenwith=dm.widthPixels;  
28.         int screenheigh=dm.heightPixels;  
29.         txview=(TextView)findViewById(R.id.textwh);  
30.         txload=(TextView)findViewById(R.id.loadtext);  
31.         pBar=(ProgressBar)findViewById(R.id.pb);  
32.         txview.setText("屏幕宽度:"+screenwith+"\n屏幕长度："+screenheigh);        //通过线程来改变ProgressBar的值  
33.           
34.         new Thread(new Runnable() {  
35.             public void run()  
36.             {  
37.                 for (int i = 0; i <=pBar.getMax(); i++)  
38.                 {  
39.                     try  
40.                     {  
41.                         Thread.sleep(100);  
42.                         iintCounter=i+1;  
43.                         if (i == pBar.getMax())  
44.                         {  
45.                             Message m = new Message();  
46.                             m.what=LoadBar.stop; //what是一个×××值  
47.                             LoadBar.this.myMessageHandler.sendMessage(m);  
48.                             //将处理信息发送给myMessageHandler处理  
49.                             break;  
50.                         }  
51.                         else  
52.                         {  
53.                             Message m = new Message();  
54.                             m.what=LoadBar.start;  
55.                             LoadBar.this.myMessageHandler.sendMessage(m);  
56.                         }  
57.                     }  
58.                     catch (Exception e)  
59.                     {  
60.                         e.printStackTrace();  
61.                     }  
62.                 }  
63.             }  
64.         }).start();  
65. }  
66. //重构Handler方法  
67. Handler myMessageHandler = new Handler()  
68. {  
69.   // @Override   
70.       public void handleMessage(Message msg)  
71.       {  
72.           switch (msg.what)  
73.           {  
74.           //ProgressBar已经是对大值  
75.           case LoadBar.stop:  
76.               //设置Intent，跳转到其他Activity  
77.               Intent mIntent=new Intent();  
78.               mIntent.setClass(LoadBar.this, Menu.class);  
79.               startActivity(mIntent);  
80.               Log.d("Lua", "Main==class");  
81.               Thread.currentThread().interrupt();  
82.               finish();  
83.               break;  
84.           case LoadBar.start:  
85.               if (!Thread.currentThread().isInterrupted())  
86.               {  
87.                   // 改变ProgressBar的当前值  
88.                   pBar.setProgress(intCounter);  
89.                   // 设置标题栏中前景的一个进度条进度值  
90.                   Log.d("Lua", "LoadBar线程");  
91.                   txload.setText("  加载中 "+intCounter+"%");  
92.               }  
93.               break;  
94.           }  
95.           super.handleMessage(msg);  
96.      }  
97.     };  
98. } 

Game.java

1. package com.dance.mrljdx;  
2.  
3. import android.app.Activity;  
4. import android.media.MediaPlayer;  
5. import android.os.Bundle;  
6. import android.os.Handler;  
7. import android.os.Message;  
8. import android.util.Log;  
9. import android.view.KeyEvent;  
10. import android.view.View;  
11. import android.view.View.OnClickListener;  
12. import android.view.animation.Animation;  
13. import android.view.animation.AnimationUtils;  
14. import android.widget.ImageButton;  
15. import android.widget.ImageView;  
16. import android.widget.SeekBar;  
17. public class Game extends Activity {  
18.     MediaPlayer mediaPlayer;  
19.     ImageButton imgbt1,imgbt2,imgbt3,openbt;  
20.     OnClickListener listener1=null;  
21.     OnClickListener listener2=null;  
22.     OnClickListener listener3=null;  
23.     OnClickListener listener4=null;  
24.     OnClickListener openlistener=null;  
25.     SeekBar sBar;  
26.     Animation myAnimation;  
27.     ImageView img1;  
28.     private static final int start=1;  
29.     private static final int end=2;  
30. //  int position=mediaPlayer.getCurrentPosition();  
31.     int pb,i;  
32.     double current;  
33.     @Override  
34.     public void onCreate(Bundle savedInstanceState) {  
35.         super.onCreate(savedInstanceState);  
36.         setContentView(R.layout.game);  
37.         setListener();  
38.         imgbt1=(ImageButton)findViewById(R.id.btleft);  
39.         imgbt1.setOnClickListener(listener1);  
40.         imgbt2=(ImageButton)findViewById(R.id.btright);  
41.         imgbt2.setOnClickListener(listener2);  
42.         imgbt3=(ImageButton)findViewById(R.id.btup);  
43.         imgbt3.setOnClickListener(listener3);  
44. //        openbt=(ImageButton)findViewById(R.id.btopen);  
45.         sBar=(SeekBar)findViewById(R.id.seek);  
46.         pb=sBar.getProgress();  
47.         myAnimation= AnimationUtils.loadAnimation(this,R.anim.img);  
48.         img1=(ImageView) this.findViewById(R.id.img1);  
49.          
50.     }  
51.     void setListener(){  
52.         listener1=new OnClickListener() {  
53.             public void onClick(View v) {  
54.                 initSound();  
55.             }  
56.         };  
57.         listener2=new OnClickListener() {  
58.             public void onClick(View v) {  
59.                 stopMusic();  
60.             }  
61.         };  
62.         listener3=new OnClickListener() {  
63.             public void onClick(View v) {  
64.                 img1.setVisibility(View.INVISIBLE);  
65.             }  
66.         };  
67.         openlistener=new OnClickListener() {  
68.             public void onClick(View v) {  
69.                 // TODO Auto-generated method stub  
70.                 choosMusic();  
71.             }  
72.         };  
73.     }  
74.         //游戏音效  
75.     void initSound(){  
76.         mediaPlayer=MediaPlayer.create(this,R.raw.gf);  
77.         if(!mediaPlayer.isPlaying()){  
78.             mediaPlayer.start();//播放声音  
79.             img1.setVisibility(View.VISIBLE);  
80.             img1.startAnimation(myAnimation);  
81.         }  
82.         new Thread(new Runnable() {  
83.               
84.             public void run() {  
85.                 // TODO Auto-generated method stub  
86.                   
87.                 while(current<1){  
88.                     Message m=new Message();  
89.                     if(mediaPlayer.isPlaying()){  
90.                         current=(double)mediaPlayer.getCurrentPosition()/mediaPlayer.getDuration();  
91. //                      Log.d("Lua", "==当前音乐是否播放="+mediaPlayer.isPlaying());  
92.                         m.what=Game.start;  
93.                         Game.this.musicHandler.sendMessage(m);  
94.                     }else {  
95.                         Log.d("Lua", "当前音乐是否播放="+mediaPlayer.isPlaying());  
96.                         m.what=Game.end;  
97.                         Game.this.musicHandler.sendMessage(m);  
98.                         break;  
99.                     }  
100.                 }  
101.             }  
102.         }).start();  
103.     }  
104.     //停止播放音乐  
105.     void stopMusic(){  
106.         if(mediaPlayer.isPlaying()){  
107.             mediaPlayer.stop();//暂停声音  
108.         }  
109.         this.finish();  
110.     }  
111.     //选择播放的音乐  
112.     void choosMusic(){  
113.           
114.     }  
115.     Handler musicHandler = new Handler(){  
116.         public void handleMessage(Message msg) {  
117.             switch(msg.what)  
118.             {  
119.             case Game.start:  
120.                 if (!Thread.currentThread().isInterrupted())  
121.                 {  
122.                     int i=new Double(current*100).intValue();  
123.                     Log.d("Lua", "==当期音乐播放位置="+i);  
124.                     // 改变ProgressBar的当前值  
125.                     sBar.setProgress(i+1);  
126.                 }  
127.               break;  
128.             case Game.end:  
129.                 Log.d("Lua", "当前音乐是否播放="+mediaPlayer.isPlaying());  
130.                 Thread.currentThread().interrupt();  
131.                 break;  
132.             }  
133.               
134.         }  
135.     };  
136. }  

游戏截图：