handler优化

最新推荐文章于 2021-05-27 14:25:39 发布

原创最新推荐文章于 2021-05-27 14:25:39 发布 · 137 阅读

0 ·

CC 4.0 BY-SA版权

本文介绍了一个使用弱引用的自定义Handler类实现，该类用于在特定消息到达时更新UI组件，确保了即使在Activity销毁后也不会尝试访问已不存在的对象。

private static final class MyHandler extends Handler {

    private WeakReference<AnswerCardActivity> activityWeakReference;

    MyHandler(AnswerCardActivity answerCardActivity) {
        this.activityWeakReference = new WeakReference<>(answerCardActivity);
    }

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Override
    public void dispatchMessage(Message msg) {

        AnswerCardActivity answerCardActivity = activityWeakReference.get();
        if (answerCardActivity == null || answerCardActivity.isFinishing()) {
            return;
        }

        switch (msg.what) {
            case 100:
                answerCardActivity.receiveSignalAndGood((WebSocketEnty.ResultEntity) msg.obj);
                break;
           
            default:
                break;
        }
    }
}