HandlerThread in Android

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HandlerThread in Android

The HandlerThread is a convenience class that initiates a Looper within a Thread to process Runnable or Message objects. The Handler is used to handle the insertion of the Runnable or Message objects into the looper's queue: The Handler class supports several other ways to schedule a Message to be processed at a future time:

Queueing tasks

• sendMessage - Pushes a message onto the end of the message queue.
• sendMessageDelayed - Pushes a message onto the end of the message queue.
• sendMessageAtTime - Pushes a message onto the end of the message queue.
• sendEmptyMessage - Sends Message containing only a single int code.
• sendEmptyMessageDelayed - Sends Message to be delivered after the specified time elapses.
• sendEmptyMessageAtTime - Sends Message to be delivered at the specified absolute time.

Stopping

handlerThread.quit(); // quits immediately

01_HandlerThread.java

// Create a new background thread for processing messages or runnables sequentially
HandlerThread handlerThread = new HandlerThread("HandlerThreadName");
// Starts the background thread
handlerThread.start();
// Create a handler attached to the HandlerThread's Looper
mHandler = new Handler(handlerThread.getLooper()) {
    @Override
    public void handleMessage(Message msg) {
        // Process received messages here!
    }
};

02_executing.java

// Execute the specified code on the worker thread
mHandler.post(new Runnable() {
    @Override
    public void run() {
        // Do something here!
    }
});