android监听键盘

android中的带有输入功能的页面布局经常被弹出的键盘遮挡，一种处理方法是监听键盘的弹出，设置布局的padding或隐藏某些占位控件，使得输入框不被键盘遮挡。一种常用的方法是当Activity设置为android:windowSoftInputMode="adjustResize"的时候，键盘的弹出和隐藏会触发onSizeChaged的事件，用下面的自定义RealativeLayout则能监听这个函数并判断键盘是弹出还是收起。

/*
 * @Project: GZJK
 * @Author: cmcc
 * @Date: 2015年5月6日
 * @Copyright: 2000-2015 CMCC . All rights reserved.
 */
package com.matrix.appsdk.widget.keyboard;

import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.Display;
import android.widget.RelativeLayout;

/** 
* @ClassName: InputMethodRelativeLayout 
* @Description: 监听键盘的现实和隐藏，Activity设置为adjustResize，非全屏
* @author
* @date 2015年5月6日 下午6:48:57 
*/
public class InputMethodRelativeLayout extends RelativeLayout {
    private int width;
    protected OnSizeChangedListenner onSizeChangedListenner;
    private boolean sizeChanged = false; // 变化的标志
    private int height;
    private int screenHeight; // 屏幕高度
    
    public InputMethodRelativeLayout(Context paramContext, AttributeSet paramAttributeSet) {
        super(paramContext, paramAttributeSet);
        Display localDisplay = ((Activity)paramContext).getWindowManager().getDefaultDisplay();
        this.screenHeight = localDisplay.getHeight();
    }
    
    public InputMethodRelativeLayout(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {
        super(paramContext, paramAttributeSet, paramInt);
    }
    
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        this.width = widthMeasureSpec;
        this.height = heightMeasureSpec;
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    }
    
    @Override
    public void onSizeChanged(int w, int h, int oldw, int oldh) {
        // 监听不为空、宽度不变、当前高度与历史高度不为0
        if ((this.onSizeChangedListenner != null) && (w == oldw) && (oldw != 0) && (oldh != 0)) {
            if ((h >= oldh) || (Math.abs(h - oldh) <= 1 * this.screenHeight / 4)) {
                if ((h <= oldh) || (Math.abs(h - oldh) <= 1 * this.screenHeight / 4))
                    return;
                this.sizeChanged = false;
            } else {
                this.sizeChanged = true;
            }
            this.onSizeChangedListenner.onSizeChange(this.sizeChanged, oldh, h);
            measure(this.width - w + getWidth(), this.height - h + getHeight());
        }
    }


    /**
     * 设置监听事件
     * @param paramonSizeChangedListenner
     */
    public void setOnSizeChangedListenner(InputMethodRelativeLayout.OnSizeChangedListenner paramonSizeChangedListenner) {
        this.onSizeChangedListenner = paramonSizeChangedListenner;
    }
    
    /**
     * 大小改变的内部接口
     * @author junjun
     *
     */
    public  interface OnSizeChangedListenner {
        void onSizeChange(boolean showKeyboard, int oldH, int newH);
    }
}

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