Android的定时器/ TimerTask的引起我的应用程序崩溃？ [英] Android timer/timertask causing my app to crash?

问题描述

不仅是测试的code是简单的块在我mainActivity的onCreate：

Just testing out a simple block of code in my mainActivity's onCreate:

Timer timer2 = new Timer(); 
        TimerTask testing = new TimerTask() {
            public void run() { 
                Toast.makeText(mainActivity.this, "test", Toast.LENGTH_SHORT).show();

            }
        };
        timer2.schedule(testing, 1000);

我得到的强制关闭的错误虽然。

I get the "force close" error though.

怎么办？

推荐答案

好了为别人谁运行到这一点，我用一个处理程序和可运行做面包，这似乎有需要的用户界面交互解决了这一问题：

Alright for anyone else who runs into this, I fixed the problem by using a Handler and Runnable to do the Toast, which seems to be needed for UI interaction:

    final Handler handler = new Handler(); 
    Timer timer2 = new Timer(); 
    TimerTask testing = new TimerTask() {
        public void run() { 
            handler.post(new Runnable() {
                public void run() {
                    Toast.makeText(mainActivity.this, "test", Toast.LENGTH_SHORT).show();
                }

            });


        }
    };
    timer2.schedule(testing, 1000);

我还是不明白为什么这是必要的，虽然，也许有人能解释一下吗？但是，嘿，至少这个code工作笑。

I still don't understand why this is necessary though, perhaps someone could explain? But hey at least this code works lol.

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