如何在 Android 中创建键盘监听器？答案

【问题标题】：How can i create a keyboard listener in Android?如何在 Android 中创建键盘监听器？
【发布时间】：2014-10-03 19:59:41
【问题描述】：

我想在键盘出现时更改特定布局的可见性。如何为此创建监听器？

【问题讨论】：

标签： android keyboard listener

【解决方案1】：

为软键盘检测创建一个类

public class RelativeLayoutThatDetectsSoftKeyboard extends RelativeLayout {

    public RelativeLayoutThatDetectsSoftKeyboard(Context context, AttributeSet attrs) 
    {
        super(context, attrs);
    }

    public interface Listener
    {
        public void onSoftKeyboardShown(boolean isShowing);
    }

    private Listener listener;

    public void setListener(Listener listener) 
    {
        this.listener = listener;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
    {
        int height = MeasureSpec.getSize(heightMeasureSpec);
        Activity activity = (Activity)getContext();
        Rect rect = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
        int statusBarHeight = rect.top;
        int screenHeight = activity.getWindowManager().getDefaultDisplay().getHeight();
        int diff = (screenHeight - statusBarHeight) - height;

        if (listener != null) 
        {
            listener.onSoftKeyboardShown(diff>128); // assume all soft keyboards are at least 128 pixels high
        }

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);       
    }
}

使用 RelativeLayoutThatDetectsSoftKeyboard 类扩展您的活动并在您的活动中编写以下代码

// 键盘可见时滚动布局

RelativeLayoutThatDetectsSoftKeyboard mChkKeyBoradVisibility;
            mChkKeyBoradVisibility = (RelativeLayoutThatDetectsSoftKeyboard)    mTabLogin_Layout.findViewById(your layout id);
            mChkKeyBoradVisibility.setListener(this);

【讨论】：