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://*.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。
上面的方法监听到键盘的隐藏和显示后，还是需要设置布局控件的隐藏，padding或者margin等属性来调节高度。还有一种不用上面自定义RelativeLayout直接让系统adjustRisize简单的方法，如果直接用EditText然后AndroidManifest.xml中设置它的Activtiy为
android:windowSoftInputMode="stateHidden|adjustResize"
键盘出现后会出现部分遮挡输入框，如下图：
最简单的解决方法让遮挡变小，仿照微信的给输入文本加一个下划线，效果（下图右）就好一些。注意下划线用点9的图，编辑区域留出合适的就可以了。这是从效果图上试出来的方法，具体的键盘遮挡和显示隐藏等问题还要看sourcecode啊~~
参考文档：