如何在Android上使用硬件后退按钮捕获事件? [英] How to catch event with hardware back button on android?

问题描述

如何使用Android上的硬件后退按钮捕获事件?我需要禁止用户返回，并且单击电话上的后退"按钮以显示消息，而不要继续上一个活动.该怎么做?

How to catch event with hardware back button on android ? I need to supress user to go back and I when click on back button on phone to show message and not to go on previous activity. How to do that ?

推荐答案

您可以这样做

1. 以这种方式将onBackPressed()方法覆盖到您的Activity中

1. override the onBackPressed() method into your Activity like this way

public void onBackPressed(){
     // do something here and don't write super.onBackPressed()
}

覆盖onKeyDown()方法

override the onKeyDown() method

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch(keyCode){
    case KeyEvent.KEYCODE_BACK:
        // do something here 
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

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