Handler 静态内部类弱引用防止内存泄漏

https://blog.csdn.net/l707941510/article/details/80641444

写了一个简答的倒计时 记录一下防止遗忘

public class WelcomeActivity extends BaseActivity {

    private MyHandler myHandler;

    /*
     * 引导页
     * */
    @Override
    protected int getContentViewId() {
        return R.layout.activity_welcome;
    }

    private int time = 2;

    @Override
    protected void initUI() {
        myHandler = new MyHandler(this);
        myHandler.post(runnable);

    }


    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            time--;
            if (time > 0) {
                myHandler.postDelayed(runnable, 2000);
            } else {
                startActivity(MainActivity.class);
            }
        }
    };

    @Override
    protected void initData() {

    }

    /**
     * 声明一个静态的Handler内部类，并持有外部类的弱引用
     */
    private static class MyHandler extends Handler {

        private final WeakReference<WelcomeActivity> mActivty;

        private MyHandler(WelcomeActivity mActivty) {

            this.mActivty = new WeakReference<WelcomeActivity>(mActivty);

        }

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

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //删除所有的消息
        myHandler.removeCallbacksAndMessages(null);
    }
}