从关闭我的应用程序prevent后退按钮 [英] Prevent Back button from closing my application

问题描述

我使用下面的code。在我的应用程序的活动，以prevent从收盘回到我的应用程序。

I am using the following code in my application's activity to prevent it from closing my app on back.

/* Prevent app from being killed on back */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        // Back?
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // Back
            moveTaskToBack(true);
        }

        // Return
        return super.onKeyDown(keyCode, event);

    }

这是行不通的。该应用程序被设置为Android 1.6的（API等级4）兼容。点击我的应用程序图标重新启动我在飞溅的活动应用程序（这是主要的）。我怎样才能prevent我的应用程序的关闭背？

It does not work. The app is set to be Android 1.6 (API Level 4) compatible. Clicking on my application icon restarts my app at a Splash activity (which is the Main). How can I prevent my app from closing on back?

推荐答案

您是否尝试过把超在else块所以它如果密钥只有所谓的来电没有键code_BACK ？

Have you tried putting the super call in an else block so it is only called if the key is not KEYCODE_BACK ?

/* Prevent app from being killed on back */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        // Back?
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // Back
            moveTaskToBack(true);
            return true;
        }
        else {
            // Return
            return super.onKeyDown(keyCode, event);
        }
    }

不过说实话，你不能依靠这一点，因为一旦你的应用程序放置在后台，在任何时候都有可能被回收的系统回收内存。

In all honesty though, you can't rely on this because once your app is placed in the background, at any moment it could be recycled for the system to reclaim memory.

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