Android background thread

在Android上使用Handler預設為Main Thread (UI Thread)工作

但在執行耗時工作時有可能會造成ANR

因此可以改用HandlerThread在背景執行工作，避免UI Thread塞車

--

private HandlerThread mBGThread;

private Handler mHandler;

mBGThread = new HandlerThread("BackgroundThread");

mBGThread.start();

mHandler = new Handler (mBGThread.getLooper()) {

       @Override

        public void handleMessae(@NunNull Message msg) {super.handleMessage(msg);} 

};

此時mHandler即在Background thread工作

以下可判斷是否在Main thread

boolean isMainThread = (Thread.currentThread() == Looper.getMainLooper().getThread());

結束Background thread時

mBGThread.quit();