android软键盘现实和隐藏的监听

最新推荐文章于 2024-08-05 03:05:54 发布

原创最新推荐文章于 2024-08-05 03:05:54 发布 · 728 阅读

0 ·

CC 4.0 BY-SA版权

Android学习专栏收录该内容

530 篇文章

订阅专栏

本文介绍如何在Android应用中监听视图高度变化，从而判断软件键盘的显示与隐藏，通过实现KeyboardDetectorRelativeLayout类，该类在高度变化时触发键盘状态改变事件通知。

http://stackoverflow.com/questions/4312319/howto-capture-the-virtual-keyboard-show-hide-event-in-android

http://stackoverflow.com/questions/2150078/how-to-check-visibility-of-software-keyboard-in-android?lq=1

大概的方法就是监听view的的高度的变化，来判断软键盘的显示和隐藏。

注意：一点就是属性要设置的好，很多情况下试adjustResize才有效。

import java.util.Arraylist;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

public class KeyboardDetectorRelativeLayout extends RelativeLayout {

    public interface IKeyboardChanged {
        void onKeyboardShown();
        void onKeyboardHidden();
    }

    private ArrayList<IKeyboardChanged> keyboardListener = new ArrayList<IKeyboardChanged>();

    public KeyboardDetectorRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

    public KeyboardDetectorRelativeLayout(Context context) {
        super(context);
    }

    public void addKeyboardStateChangedListener(IKeyboardChanged listener) {
        keyboardListener.add(listener);
    }

    public void removeKeyboardStateChangedListener(IKeyboardChanged listener) {
        keyboardListener.remove(listener);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int proposedheight = MeasureSpec.getSize(heightMeasureSpec);
        final int actualHeight = getHeight();

        if (actualHeight > proposedheight) {
            notifyKeyboardShown();
        } else if (actualHeight < proposedheight) {
            notifyKeyboardHidden();
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    private void notifyKeyboardHidden() {
        for (IKeyboardChanged listener : keyboardListener) {
            listener.onKeyboardHidden();
        }
    }

    private void notifyKeyboardShown() {
        for (IKeyboardChanged listener : keyboardListener) {
            listener.onKeyboardShown();
        }
    }

}