Handler消息应用相关

主要用于跨线程 Thread、Healder、Looper、Timer 结合使用

Activity <-> Looper -> MessageQueue
Handler <-> Looper -> MessageQueue

Looper == Message Queue Manager

Looper.getMainLooper(); //获取主线程Looper

Looper.myLooper();//获取当前线程Looper???

Looper.prepare();//创建消息队列，子线程默认没有消息队列，主线程队列无需调用

Looper.prepareMainLooper();//创建主线程消息队列

Looper.loop();//启动队列循环

 

本地消息

    public void btn_click1(View view){
    	new Thread(new Runnable() {
			
			@Override
			public void run() {
				List<String> list1=new ArrayList<String>();
				list1.add("a");
				list1.add("b");
				list1.add("c");
				
				//自定义信息
				Message msg = myHandler.obtainMessage(); 
				
				//信息配置
				Bundle bundle = new Bundle();
				bundle.putBoolean("msg1",true);
				bundle.putInt("msg2",10);
				bundle.putString("msg3","a");
				bundle.putSerializable("msg4", (Serializable)list1);				
				msg.setData(bundle);				
				
				//信息发送方法1
				msg.setTarget(myHandler);
				msg.sendToTarget();
				
				//信息发送方法2 
				//myHandler.sendMessage(msg);
			}
		}).start();    	 	
    }
    
    private final Handler myHandler = new Handler(Looper.getMainLooper()) {
    	@Override
    	public void handleMessage(Message msg) {
    		Bundle bundle = msg.getData();
    		
    		Boolean bool = bundle.getBoolean("msg1");   		
    		int valueInt = bundle.getInt("msg2");    		
    		String valueStr=bundle.getString("msg3");    		
    		Object obj=bundle.get("msg4");
    		
			List<String> list1=(List<String>)obj;
			if(list1!=null){
				for(String item : list1){
					Log.i("acu","msg4=" + item);
				}
			}    		
			
			AlertDialog.Builder builder = new AlertDialog.Builder(Test1.this);
			builder.setIcon(android.R.drawable.ic_menu_help);
			builder.setTitle("提示");
			builder.setMessage("跨线程调用演示");
			builder.setIcon(R.drawable.ic_launcher);		
			builder.setPositiveButton("ok",null);
			builder.setNegativeButton("cancel",null);		
			AlertDialog ad=builder.create();
			ad.show();
			Toast.makeText(Test1.this, "跨线程调用演示", 3000).show();
    		super.handleMessage(msg);
    	}
	};