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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); } }
这样,使用该自定义layout的Activity只需要在回调onSizeChange中进行处理就可以了。
但是,当Activity设置为全屏时,即使activity属性设置为adjustResize,当键盘显示或隐藏时,这个方法也不会被触发,此时可以监听根View的变化。在Activity设置完layout后使用下面的一句话:
AndroidBug5497Workaround.assistActivity(this);
AndroidBug5497Workaround的代码如下:
package com.matrix.appsdk.widget.keyboard; import android.app.Activity; import android.graphics.Rect; import android.view.View; import android.view.ViewTreeObserver; import android.widget.FrameLayout; /** * @author BMR * @ClassName: AndroidBug5497Workaround * @Description: 解决Activity为全屏时设置为adjustResize,InputMethodRelativeLayout检测键盘不触发onSizeChanged * @date 2016/1/9 21:09 */ //Workaround to get adjustResize functionality for input methos when the fullscreen mode is on //found by Ricardo //taken from http://stackoverflow.com/a/19494006 public class AndroidBug5497Workaround { // For more information, see https://code.google.com/p/android/issues/detail?id=5497 // To use this class, simply invoke assistActivity() on an Activity that already has its content view set. public static void assistActivity (Activity activity) { new AndroidBug5497Workaround(activity); } private View mChildOfContent; private int usableHeightPrevious; private FrameLayout.LayoutParams frameLayoutParams; private AndroidBug5497Workaround(Activity activity) { FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content); mChildOfContent = content.getChildAt(0); mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { public void onGlobalLayout() { possiblyResizeChildOfContent(); } }); frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams(); } private void possiblyResizeChildOfContent() { int usableHeightNow = computeUsableHeight(); if (usableHeightNow != usableHeightPrevious) { int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight(); int heightDifference = usableHeightSansKeyboard - usableHeightNow; if (heightDifference > (usableHeightSansKeyboard/4)) { // keyboard probably just became visible frameLayoutParams.height = usableHeightSansKeyboard - heightDifference; } else { // keyboard probably just became hidden frameLayoutParams.height = usableHeightSansKeyboard; } mChildOfContent.requestLayout(); usableHeightPrevious = usableHeightNow; } } private int computeUsableHeight() { Rect r = new Rect(); mChildOfContent.getWindowVisibleDisplayFrame(r); return (r.bottom - r.top); } }
这样,在利用开始的方法就可以了,onSizeChange就可以处理键盘事件了。
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原文地址:http://www.cnblogs.com/permanent2012moira/p/5120282.html