android Toast提示異常：java.lang.RuntimeException: Can't create handler inside thread that has not called

仔細檢查了程式碼，不應該異常啊？？  沒有 handler相關程式碼啊？

               原來是在子執行緒彈Toast了， 切記，Toast只能在UI執行緒彈出，如果一定要在子執行緒彈，那麼就通過 new Handler(Looper.getMainLooper()) 來彈

   private void toastTest() {
    	new Thread(new Runnable() {
			
			@Override
			public void run() {
				<span style="color:#cc0000;">Handler handler = new Handler(Looper.getMainLooper());</span>
				handler.post(new Runnable() {
					
					@Override
					public void run() {
						//放在UI執行緒彈Toast
						Toast.makeText(MainActivity.this, "toast in work thread", Toast.LENGTH_LONG).show();
					}
				});
				//此處會發生異常
//				Toast.makeText(MainActivity.this, "toast in work thread", Toast.LENGTH_LONG).show();
			}
		}).start();
    }