android 中是否有默认的后退键（在设备上）侦听器？

发布于 2024-08-28 03:46:35 字数 355 浏览 6 评论 0 原文

我有两个活动 A 和 B。当我单击 A 中的按钮时，将显示 B。当我单击 B 中的按钮时，它将返回到 A。我在 finish() 方法之后设置了 overridePendingTransition 方法。它工作正常。但如果当前的 Activity 是 B。当时我单击设备中的默认后退按钮。它显示从右到左的过渡以显示活动 A。

我如何收听设备上的默认后退键？

编辑：

Log.v(TAG, "back pressed");
finish();
overridePendingTransition(R.anim.slide_top_to_bottom, R.anim.hold);

原文

I am having two activities A and B. when i click the button in A that will shows B. when i click the Button in B it backs to A. i had set the overridePendingTransition method after the finish() method. it works properly. but in case the current Activity is B. on that time i click the default back button in the device. it shows the right to left transition to show the Activity A.

How i can listen that Default back key on device?

EDIT:

Log.v(TAG, "back pressed");
finish();
overridePendingTransition(R.anim.slide_top_to_bottom, R.anim.hold);

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木格 2024-09-04 03:46:35

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

以下链接是 Android 开发人员自己编写的有关如何处理后退键事件的详细说明：

使用后退键

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

The following link is a detailed explanation on how to handle back key events, written by the Android developers themselves:

Using the back key

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旧故 2024-09-04 03:46:35

对于Android 2.0及更高版本，Activity类中有一个具体的方法：

@Override  
public void onBackPressed() {
    super.onBackPressed();   
    // Do extra stuff here
}

For Android 2.0 and later, there is a specific method in the Activity class:

@Override  
public void onBackPressed() {
    super.onBackPressed();   
    // Do extra stuff here
}

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转身以后 2024-09-04 03:46:35

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(keyCode == KeyEvent.KEYCODE_BACK){
        //Do stuff
    }

    return super.onKeyDown(keyCode, event);
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(keyCode == KeyEvent.KEYCODE_BACK){
        //Do stuff
    }

    return super.onKeyDown(keyCode, event);
}

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厌倦 2024-09-04 03:46:35

有关后退键内容的更多信息可以在这里找到： http://android-developers.blogspot.com/2009/12/back-and-other-hard-keys- Three-stories.html

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转身泪倾城 2024-09-04 03:46:35

我在带有媒体播放器的活动中使用此代码。当用户按下后退按钮时，我需要停止播放，但仍然能够返回到之前的活动。

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        try{
            mp.stop(); //this line stops the player
            return super.onKeyDown(keyCode, event);//this line does the rest 
        }
        catch(IllegalStateException e){
            e.printStackTrace();
        }
        return true;
    }

    return super.onKeyDown(keyCode, event); //handles other keys
}

I use this code on an activity with a media player. I needed to stop the playback when user pressed the back button but still be able to go back to previous activity.

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        try{
            mp.stop(); //this line stops the player
            return super.onKeyDown(keyCode, event);//this line does the rest 
        }
        catch(IllegalStateException e){
            e.printStackTrace();
        }
        return true;
    }

    return super.onKeyDown(keyCode, event); //handles other keys
}

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