Android.view.ViewRoot$CalledFromWrongThreadException

 1、发生Android.view.ViewRoot$CalledFromWrongThreadException异常：

诞生一个主线程的Handler的物件，当做Listener去让子线程能够将讯息Push到主线程的message Quene里，以便触发主线程的handlerMessage()函数，让主线程知道子线程的状态，并在主线程更新UI。

创建一个Handler对象， @Override中handleMessage

public final static int GET_FROM_BACKEND_SUCCESS = 1;
public final static int GET_FROM_BACKEND_FAILED = -1;

private Handler getDataHandler = new Handler(){
        /* (non-Javadoc)
         * @see android.os.Handler#handleMessage(android.os.Message)
         */
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            super.handleMessage(msg);
            int id = msg.what;
            switch(id){
            case GET_FAVORITE_LIST_FROM_BACKEND_SUCCESS:

                break;
            case GET_FAVORITE_LIST_FROM_BACKEND_FAILED:

                break;
            }
            ....setVisibility(View.GONE);
        }
    };
    private Runnable runnable = new Runnable(){
        @Override
        public void run() {
            try {
                ...........
                getDataHandler.sendEmptyMessage(GET_FROM_BACKEND_SUCCESS);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                getDataHandler.sendEmptyMessage(GET_FROM_BACKEND_FAILED);
            }
        }
    };
    private Thread getDataThread;

if(!msalApp.haveAvaliableNetWork()){
            Toast.makeText(this, R.string.no_internet, Toast.LENGTH_SHORT).show();
        }else{
            ....setVisibility(View.VISIBLE);
            getDataThread = new Thread(runnable);
            getDataThread.setPriority(Thread.NORM_PRIORITY);
            getDataThread.start();
        }
}