Android:检测软键盘打开

Question

当软键盘打开时,我想要滚动视图向下滚动到底部.

为此,我可以使用:fullScroll(View.FOCUS_DOWN);

但是,如何在软键盘打开事件触发后触发该命令？

Answer 1

这是我的解决方案:

1 /一个简单的界面

public interface KeyboardVisibilityListener {
    void onKeyboardVisibilityChanged(boolean keyboardVisible);
}

2 /一个实用工具方法(把它放在你想要的地方,例如在一个名为的类中KeyboardUtil)

public static void setKeyboardVisibilityListener(Activity activity, KeyboardVisibilityListener keyboardVisibilityListener) {
    View contentView = activity.findViewById(android.R.id.content);
    contentView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        private int mPreviousHeight;

        @Override
        public void onGlobalLayout() {
            int newHeight = contentView.getHeight();
            if (mPreviousHeight != 0) {
                if (mPreviousHeight > newHeight) {
                    // Height decreased: keyboard was shown
                    keyboardVisibilityListener.onKeyboardVisibilityChanged(true);
                } else if (mPreviousHeight < newHeight) {
                    // Height increased: keyboard was hidden
                    keyboardVisibilityListener.onKeyboardVisibilityChanged(false);
                } else {
                    // No change
                }
            }
            mPreviousHeight = newHeight;
        }
    });
}

3 /以这种方式使用活动(一个好地方在onCreate):

KeyboardUtil.setKeyboardVisibilityListener(this, mKeyboardVisibilityListener);

Answer 2

根据这篇文章以及关于android-developers的这篇文章,它似乎不可能做你想要的.您可能希望重新检查您的用例以了解您正在做的事情.也许其中一个softInputMode标志对你有用.

Answer 3

看着日期,可能你有一个问题的解决方案,否则:

以下是我对另一个相关问题的回答:有没有办法判断是否显示了软键盘？

但我在这里复制完整的回复以避免死链接:

请检查您的活动的配置更改

这适用于您的AndroidManifest.xml

这适用于您的Activity类http://developer.android.com/reference/android/app/Activity.html#onConfigurationChanged(android.content.res.Configuration)

您将需要@Override您的Activity的onConfigurationChanged(android.content.res.Configuration)的公共方法,以便能够处理,例如,这个值:
hardKeyboardHidden,
keyboard,
keyboardHidden

对于所有可能的值,请查看http://developer.android.com/reference/android/content/res/Configuration.html

你会看到类似这样的东西:

HARDKEYBOARDHIDDEN_NO   
HARDKEYBOARDHIDDEN_UNDEFINED    
HARDKEYBOARDHIDDEN_YES  
KEYBOARDHIDDEN_NO   
KEYBOARDHIDDEN_UNDEFINED    
KEYBOARDHIDDEN_YES  
KEYBOARD_12KEY  
KEYBOARD_NOKEYS 
KEYBOARD_QWERTY 
KEYBOARD_UNDEFINED

在那里你可以阅读这样的东西:

public int  hardKeyboardHidden  A flag indicating whether the hard keyboard has been      hidden.
public int  keyboard    The kind of keyboard attached to the device.
public int  keyboardHidden  A flag indicating whether any keyboard is available.

更新:

这是我正在谈论的具体样本:

http://developer.android.com/guide/topics/resources/runtime-changes.html

    
@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    // Checks the orientation of the screen
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
    } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
        Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
    }
    // Checks whether a hardware keyboard is available
    if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_NO) {
        Toast.makeText(this, "keyboard visible", Toast.LENGTH_SHORT).show();
    } else if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_YES) {
        Toast.makeText(this, "keyboard hidden", Toast.LENGTH_SHORT).show();
    }
}

我希望这对你有帮助