ProgressDialog进度

[功能]
ProgressDialog 也是一种Dialog
一般 在出现ProgressDialog  后台都会再开辟Thread 来做一些耗时的工作我演示的是从100数到0 这段时间既不太长 不用浪费时间等待 同时 也能明显地看出效果



[代码]
1. ProgressDialog 使用

Java代码  

1. public void startProgress(){  
2.         //to start Progress  
3.         pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,  
4.                 false);  
5.         //pd.setIcon(R.drawable.icon);  
6.     }  

public void startProgress(){
        //to start Progress
        pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,
                        false);
        //pd.setIcon(R.drawable.icon);
    }

2. 开辟一个Thread来从100数到0 在数完后 关闭ProgressDialog

Java代码  

1. public class TaskLoop implements Runnable {  
2.         @Override  
3.         public void run() {  
4.             // TODO Auto-generated method stub  
5.             loop(5000);  
6.               
7.             messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);  
8.         }  
9.           
10.     }  
11.   
12. public void loop(long i){  
13.         long j = i;  
14.         while(j>0){  
15.             Log.d("tag",j+"");  
16.               
17.             j = j-1;  
18.         }  
19.   
20.     }  

public class TaskLoop implements Runnable {
                @Override
                public void run() {
                        // TODO Auto-generated method stub
                        loop(5000);
                        
                        messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);
                }
        
    }

public void loop(long i){
        long j = i;
        while(j>0){
                Log.d("tag",j+"");
                
                j = j-1;
                }

    }

3. 运行该Thread

Java代码  

1. Thread loop = new Thread(new TaskLoop());  
2. loop.start();  

Thread loop = new Thread(new TaskLoop());
loop.start();

4.定义一个Handler 用于接受 关闭ProgressDialog 的通知

Java代码  

1. private Handler messageListener = new Handler(){  
2.         public void handleMessage(Message msg) {  
3.             switch(msg.arg1){  
4.             case TASK_LOOP_COMPLETE:  
5.                 pd.dismiss();  
6.                 break;  
7.                   
8.             }  
9.         }  
10.     };  

private Handler messageListener = new Handler(){
        public void handleMessage(Message msg) {
                        switch(msg.arg1){
                        case TASK_LOOP_COMPLETE:
                                pd.dismiss();
                                break;
                                
                        }
                }
    };

[所有代码]

Java代码  

1. public class MyProgressUsage extends Activity {  
2.     public final static int TASK_LOOP_COMPLETE = 0;  
3.       
4.     ProgressDialog pd;  
5.       
6.     TextView tv;  
7.       
8.     @Override  
9.     public void onCreate(Bundle savedInstanceState) {  
10.         super.onCreate(savedInstanceState);  
11.         setContentView(R.layout.main);  
12.           
13.         findViewById(R.id.start).setOnClickListener(new OnClickListener(){  
14.             public void onClick(View v) {  
15.                 // TODO Auto-generated method stub  
16.                 startLoop();  
17.             }  
18.         });  
19.     }  
20.       
21.     public void startLoop(){  
22.           
23.         startProgress();  
24.           
25.         Thread loop = new Thread(new TaskLoop());  
26.         loop.start();  
27.     }  
28.       
29.       
30.     public class TaskLoop implements Runnable {  
31.         @Override  
32.         public void run() {  
33.             // TODO Auto-generated method stub  
34.             loop(5000);  
35.               
36.             messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);  
37.         }  
38.           
39.     }  
40.       
41.     public void startProgress(){  
42.         //to start Progress  
43.         pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,  
44.                 false);  
45.         //pd.setIcon(R.drawable.icon);  
46.     }  
47.       
48.     //to do some time-cost task  
49.     public void loop(long i){  
50.         long j = i;  
51.         while(j>0){  
52.             Log.d("tag",j+"");  
53.               
54.             j = j-1;  
55.         }  
56.   
57.     }  
58.       
59.     private Handler messageListener = new Handler(){  
60.         public void handleMessage(Message msg) {  
61.             switch(msg.arg1){  
62.             case TASK_LOOP_COMPLETE:  
63.                 pd.dismiss();  
64.                 break;  
65.                   
66.             }  
67.         }  
68.     };  
69.       
70. }  

public class MyProgressUsage extends Activity {
        public final static int TASK_LOOP_COMPLETE = 0;
        
        ProgressDialog pd;
        
        TextView tv;
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        findViewById(R.id.start).setOnClickListener(new OnClickListener(){
                        public void onClick(View v) {
                                // TODO Auto-generated method stub
                                startLoop();
                        }
        });
    }
    
    public void startLoop(){
        
        startProgress();
        
        Thread loop = new Thread(new TaskLoop());
        loop.start();
    }
    
    
    public class TaskLoop implements Runnable {
                @Override
                public void run() {
                        // TODO Auto-generated method stub
                        loop(5000);
                        
                        messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);
                }
        
    }
    
    public void startProgress(){
        //to start Progress
        pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,
                        false);
        //pd.setIcon(R.drawable.icon);
    }
    
    //to do some time-cost task
    public void loop(long i){
        long j = i;
        while(j>0){
                Log.d("tag",j+"");
                
                j = j-1;
                }

    }
    
    private Handler messageListener = new Handler(){
        public void handleMessage(Message msg) {
                        switch(msg.arg1){
                        case TASK_LOOP_COMPLETE:
                                pd.dismiss();
                                break;
                                
                        }
                }
    };
    
}

http://dl.iteye.com/upload/picture/pic/52676/11cd6622-cb13-337a-bd52-007185e972c0.png
over!