android检测软键盘是否弹起

android.view.ViewGroup

protected void onLayout(boolean changed, int l, int t, int r, int b)

执行layout操作时调用onLayout方法。View要给它的每个Child设定size和position。拥有Children的子类需要重写onLayout方法并且调用每个Child的layout方法。

参数changed表示view的size或position发生变化。参数l, t, r, b分别表示相对于parent的left, top, right, bottom position。

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

测量View及其Content，确定measuredWidth和measuredHeight。在方法measure(int, int)中调用。重写onMeasure方法时，需要调用方法setMeasuredDimension(int, int)，存储View的measuredWidth和measuredHeight。若存储失败，方法measure(int, int)会抛出异常IllegalStateException。可以调用super.onMeasure(int, int)方法。

除非MeasureSpec准许更大的size，否则measure的默认实现是background size。子类重写onMeasure(int, int)提供Content的更佳测量。如果onMeasure被重写，子类必须保证measuredWidth和measuredHeight至少是view的minHeight和minWidth。minHeight/Width通过getSuggestedMinimumHight/Width()获取。

参数width/heightMeasureSpec表示parent强加的horizontal/vertical space要求。

void android.view.ViewGroup.layout(int l, int t, int r, int b)

给view及其descendants设定size和position。它正是layout机制的第2个步，每个parent调用它的chlidren的layout操作。使用在measure阶段测量得到的size和position数据完成layout操作。拥有child的子类必须重写onLayout方法，调用每个child的layout操作。

void android.view.ViewGroup.measureChildren(int widthMeasureSpec, int heightMeasureSpec)

请View的所有children测量themseles, 测量依据是View的MeasureSpec和padding。忽略处于GONE状态的children，是否GONE状态由getChildMeasureSpec来确定。

参数width/heightMeasureSpec表示view的width/height要求。

使用自定义布局，页面布局中包含ScrollVIew，在软键盘弹起后，布局的高度会发生改变，根据布局的高度来判断软键盘的状态。

package com.ransj.keyboard;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.widget.RelativeLayout;

public class KeyboardLayout extends RelativeLayout {

private static final String TAG = KeyboardLayout.class.getSimpleName();

public static final byte KEYBOARD_STATE_SHOW = -3;

public static final byte KEYBOARD_STATE_HIDE = -2;

public static final byte KEYBOARD_STATE_INIT = -1;

private boolean mHasInit;

private boolean mHasKeybord;

private int mHeight;

private onKybdsChangeListener mListener;

public KeyboardLayout(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

public KeyboardLayout(Context context, AttributeSet attrs) {

super(context, attrs);

}

public KeyboardLayout(Context context) {

super(context);

}

/**

* set keyboard state listener

*/

public void setOnkbdStateListener(onKybdsChangeListener listener){

mListener = listener;

}

@Override

protected void onLayout(boolean changed, int l, int t, int r, int b) {

super.onLayout(changed, l, t, r, b);

if (!mHasInit) {

mHasInit = true;

mHeight = b;

if (mListener != null) {

mListener.onKeyBoardStateChange(KEYBOARD_STATE_INIT);

}

} else {

mHeight = mHeight < b ? b : mHeight;

}

if (mHasInit && mHeight > b) {

mHasKeybord = true;

if (mListener != null) {

mListener.onKeyBoardStateChange(KEYBOARD_STATE_SHOW);

}

Log.w(TAG, "show keyboard.......");

}

if (mHasInit && mHasKeybord && mHeight == b) {

mHasKeybord = false;

if (mListener != null) {

mListener.onKeyBoardStateChange(KEYBOARD_STATE_HIDE);

}

Log.w(TAG, "hide keyboard.......");

}

}

public interface onKybdsChangeListener{

public void onKeyBoardStateChange(int state);

}

}

复制代码
这个是自定义的布局，自定义布局可以继承各种常见布局。自定义布局有键盘状态改变监听器，可以通过注册监听器来监听软键盘状态。

<?xml version="1.0" encoding="utf-8"?>

<com.ransj.keyboard.KeyboardLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/keyboardLayout1"

android:layout_width="fill_parent"

android:layout_height="fill_parent" >

<ScrollView

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:layout_alignParentLeft="true"

android:layout_alignParentTop="true"

android:fillViewport="true" >

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="vertical" >

<TextView

android:id="@+id/testone_tv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:background="#000000"

android:gravity="center"

android:text="软件盘弹起，我将消失!软键盘隐藏，我将回来!"

android:layout_weight="1.0"

android:textColor="#00ff00"

android:textStyle="bold" />

<EditText

android:id="@+id/testone_et"

android:layout_width="fill_parent"

android:layout_height="wrap_content"></EditText>

</LinearLayout>

</ScrollView>

</com.ransj.keyboard.KeyboardLayout>

复制代码
这个是优化页面的布局，从上面可以看出自定义布局的用法。

package com.ransj.keyboard;

import com.ransj.keyboard.KeyboardLayout.onKybdsChangeListener;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.TextView;

import android.widget.Toast;

/**

*

*

*/

public class TestOne extends Activity{

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.testone);

KeyboardLayout mainView = (KeyboardLayout) findViewById(R.id.keyboardLayout1);

final TextView tv = (TextView) findViewById(R.id.testone_tv);

mainView.setOnkbdStateListener(new onKybdsChangeListener() {

public void onKeyBoardStateChange(int state) {

switch (state) {

case KeyboardLayout.KEYBOARD_STATE_HIDE:

tv.setVisibility(View.VISIBLE);

Toast.makeText(getApplicationContext(), "软键盘隐藏", Toast.LENGTH_SHORT).show();

break;

case KeyboardLayout.KEYBOARD_STATE_SHOW:

tv.setVisibility(View.INVISIBLE);

Toast.makeText(getApplicationContext(), "软键盘弹起", Toast.LENGTH_SHORT).show();

break;

}

}

});

}

@Override

protected void onDestroy() {

super.onDestroy();

}

@Override

protected void onPause() {

super.onPause();

}

}

复制代码
这个是优化页面的代码逻辑，通过注册监听器，来监听软键盘事件。在软键盘弹起时隐藏Textview，在软键盘隐藏时显示Textview。

msg_send_view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener()
{

@Override

public void onGlobalLayout() {

int total_msg_height=msg_send_view.getRootView().getHeight()-msg_send_view.getHeight();

LogHelper.info("******************************2布局高度："+currentHeight);//获取当前短信布局高度

LogHelper.info("******************************2屏幕高度："+globleHeight);//获取当前短信布局高度

LogHelper.info("******************************2适配器高度："+msgHeight);//获取当前短信布局高度

msgHeight=mPullRefreshListView.getMeasuredHeight();

if(total_msg_height>100){

if(currentHeight>msgHeight){

actualListView.setStackFromBottom(true);

}

else{

actualListView.setStackFromBottom(false);

}

}else{

if(currentHeight>globleHeight){

actualListView.setStackFromBottom(true);

}

else{

actualListView.setStackFromBottom(false);

}

}

}

});

}