在使用Handler更新UI的時候出現警告：

意思是說：這個Handler 必須是static的，否則就會引發記憶體洩露。

解決：
讓Handler持有一個對Activity的WeakReference，這樣就不會洩露Activity的上下文了：

public class TestActivity extends AppCompatActivity {

    private final MyHandler mMyHandler = new MyHandler(this);

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super
 
.onCreate(savedInstanceState);

        mMyHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                // TODO: 2018/3/2  
            }
        }, 60 * 10 * 1000);
    }

    private static class MyHandler extends Handler {

        private WeakReference<TestActivity> mWeakReference = null
 
;

        private MyHandler(TestActivity activity) {
            mWeakReference = new WeakReference<TestActivity>(activity);
        }

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            TestActivity activity = mWeakReference.get();
            if
 
 (activity != null) {
                // TODO: 2018/3/2
            }
        }
    }
}