如何捕捉设备后退按钮事件在android系统？ [英] How to catch device back button event in android?

问题描述

我通过设备后退按钮会自动回到我的应用程序。它正在fine.Here我想捉回来device.I按钮事件覆盖背面button.but是我a​​pplication.when点击已打开pdf文件是不是working.please帮助我。

I have open pdf file through my application.when click on device back button it is automatically come back to my application .It is working fine.Here i want catch back button event in device.I override the back button.but it is not working.please help me.

推荐答案

这是一个例子你问：

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK ) {
        //do your stuff
    }
    return super.onKeyDown(keyCode, event);
}

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