android中是否有默认的后退键(在设备上)侦听器? [英] is there a default back key(on device) listener in android?

问题描述

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

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.

如何在设备上收听默认返回键?

How i can listen that Default back key on device?

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

推荐答案

@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开发者自己编写的关于如何处理返回键事件的详细说明:

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

使用返回键

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