Android在非UI线程中显示Toast

1. [java] view plaincopyprint?

   1. public void showToast(String msg){  
   2.         Looper.prepare();  
   3.         Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();  
   4.         Looper.loop();  
   5.     }  

   public void showToast(String msg){Looper.prepare();Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();Looper.loop();}

   只需要加上那两句就能在非UI线程中显示Toast

   [java] view plaincopyprint?

   1. Toast里面的show()  
   2.     public void show() {  
   3.       ...  
   4.         service.enqueueToast(pkg, tn, mDuration);   //把这个toast插入到一个队列里面  
   5.         ...  
   6.     }  

   Toast里面的show()    public void show() {      ...        service.enqueueToast(pkg, tn, mDuration);   //把这个toast插入到一个队列里面        ...    }

   
   
   [java] view plaincopyprint?

   1. Looper  
   2. public static final void prepare() {  
   3.         if (sThreadLocal.get() != null) {  
   4.             throw new RuntimeException("Only one Looper may be created per thread");  
   5.         }  
   6.        sThreadLocal.set(new Looper());  //在当前线程中创建一个Looper  
   7.     }  
   8.   
   9. private Looper() {  
   10.         mQueue = new MessageQueue();  //关键在这，创建Looper都干了什么。 其实是创建了消息队列  
   11.         mRun = true;  
   12.         mThread = Thread.currentThread();  
   13.     }  

   Looperpublic static final void prepare() {        if (sThreadLocal.get() != null) {            throw new RuntimeException("Only one Looper may be created per thread");        }       sThreadLocal.set(new Looper());  //在当前线程中创建一个Looper    }private Looper() {        mQueue = new MessageQueue();  //关键在这，创建Looper都干了什么。 其实是创建了消息队列        mRun = true;        mThread = Thread.currentThread();    }

   
   

 

 

 

 

 

[java] view plaincopyprint?

1. public int onStartCommand(Intent intent, int flags, int startId) {  
2.         // TODO Auto-generated method stub  
3.           
4.         System.out.println("OnStartCommand");  
5.         handler = new Handler(Looper.getMainLooper());  
6.         handler.post(new Runnable(){  
7.   
8.             public void run() {  
9.                 // TODO Auto-generated method stub  
10.                 System.out.println("in run");  
11.                 Toast toast = Toast.makeText(getApplicationContext(),"onStartCommand",Toast.LENGTH_SHORT);  
12.                 toast.setGravity(Gravity.TOP,0, 220);  
13.                 toast.show();  
14.             }  
15.               
16.         });  
17.         return super.onStartCommand(intent, flags, startId);  
18.     }  

public int onStartCommand(Intent intent, int flags, int startId) {// TODO Auto-generated method stubSystem.out.println("OnStartCommand");handler = new Handler(Looper.getMainLooper());handler.post(new Runnable(){public void run() {// TODO Auto-generated method stubSystem.out.println("in run");Toast toast = Toast.makeText(getApplicationContext(),"onStartCommand",Toast.LENGTH_SHORT);toast.setGravity(Gravity.TOP,0, 220);toast.show();}});return super.onStartCommand(intent, flags, startId);}