移动开发HandlerThread 使用实例介绍

HandlerThread 继承了 Thread，它是一种可以使用 Handler 的 Thread。

public class MainActivity extends AppCompatActivity {

    private HandlerThread mHandlerThread;
    private Handler mHandler;
    private boolean isUpdateData;

    private static final int MSG_UPDATE_DATA = 0x110;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initBackThread();
    }

    @Override
    protected void onResume() {
        super.onResume();
        isUpdateData = true;
        mHandler.sendEmptyMessage(MSG_UPDATE_DATA);
    }

    @Override
    protected void onPause() {
        super.onPause();
        isUpdateData = false;
        mHandler.removeMessages(MSG_UPDATE_DATA);
    }

    private void initBackThread() {
        // 创建并启动 HandlerThread
        mHandlerThread = new HandlerThread("update data");
        mHandlerThread.start();
        // 创建 HandlerThread
        mHandler = new Handler(mHandlerThread.getLooper()) {
            @Override
            public void handleMessage(Message msg) {
                Log.d("Guu", String.valueOf(Math.random() * 300 + 100));
                if (isUpdateData) {
                    mHandler.sendEmptyMessageDelayed(MSG_UPDATE_DATA, 1000);
                }
            }
        };
    }

}