[经典技巧]android 如何监听输入法是否弹出或隐藏，监听手机是否是全屏切换
1.创建一个宽度为0，高度为MATCH_PARENT的浮窗。浮窗要求能够被输入法盖住。
现象：
1.当输入法调起时，浮窗的高度会变化。变化为viewHeight=oldviewHeight-inputHeight；
2.当全屏时，浮窗的高度会变化为。viewHeight=screenHeight；
3.高度变化时，会回调onSizeChanged方法。所以在onSizeChanged中就可以进行监听
直接上代码：
package com.milo.test;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.WindowManager;
public class FloatKeyboardMonitor extends View{
private static final boolean DEBUG = true;
private static final String TAG ="float.KeyboardMonitor";
private final WindowManagerwindowManager;
private final WindowManager.LayoutParamslayoutParams;
private int screenHeight = 0;
private int softKeyboardHeight = 0;
private int oldOrientation=0;
public FloatKeyboardMonitor(Context context){
super(context);
windowManager =((WindowManager)context.getSystemService("window"));
layoutParams = newWindowManager.LayoutParams();
layoutParams.width= 0;
layoutParams.x=0;
layoutParams.height =WindowManager.LayoutParams.MATCH_PARENT;
layoutParams.type =WindowManager.LayoutParams.TYPE_PHONE;
//关键是WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM
//要求能够被输入法遮挡
layoutParams.flags= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM|WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
layoutParams.format= PixelFormat.TRANSPARENT;
layoutParams.gravity= Gravity.LEFT | Gravity.TOP;
windowManager.addView(this, layoutParams);
setScreenHeight(context);
setSoftKeyboardHeight(context);
}
private void setScreenHeight(Contextcontext){
DisplayMetrics dm =context.getResources().getDisplayMetrics();
screenHeight =dm.heightPixels;//手机屏幕高度
}
private void setSoftKeyboardHeight(Contextcontext){
DisplayMetrics dm =context.getResources().getDisplayMetrics();
softKeyboardHeight =(int)(dm.density*100f+0.5f);//软键盘的高度，这里定义了一个随机值，假设所有手机输入法最小高度为100dp
}
@Override
protected void onSizeChanged(int w, int h,int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (DEBUG) {
Log.i(TAG, "screenHeight=" + screenHeight + ";w=" + w +";h=" + h + ";oldw=" + oldw + ";oldh=" + oldh);
}
if (h ==screenHeight) {
if (oldh != 0) {
if (DEBUG) {
Log.i(TAG, "变化为全屏了.");
}
}else{
if (DEBUG) {
Log.i(TAG, "初始化，当前为全屏状态.");
}
}
} else if(Math.abs(h - oldh) > softKeyboardHeight) {
if (h >= oldh) {
if (DEBUG) {
Log.i(TAG, "变化为正常状态(输入法关闭).");
}
}else{
if (DEBUG) {
Log.i(TAG, "输入法显示了.");
}
}
} else{
if (oldh != 0) {
if (DEBUG) {
Log.i(TAG, "变化为正常状态.(全屏关闭)");
}
}else{
if (DEBUG) {
Log.i(TAG, "初始化，当前为正常状态.");
}
}
}
}
@Override
protected voidonConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (DEBUG) {
Log.i(TAG, "onConfigurationChanged neworientation=" +newConfig.orientation + ";oldOrientation=" + oldOrientation);
}
if (oldOrientation !=newConfig.orientation) {
setScreenHeight(getContext());
oldOrientation = newConfig.orientation;
}
}
}