Android 判断软键盘的状态（显示，隐藏）

package com.demo.softkeyboard;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

public class KeyboardListenRelativeLayout extends RelativeLayout {

private static final String TAG = KeyboardListenRelativeLayout.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 = false;
private boolean mHasKeyboard = false;
private int mHeight;

private IOnKeyboardStateChangedListener onKeyboardStateChangedListener;

public KeyboardListenRelativeLayout(Context context) {
super(context);
}
public KeyboardListenRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}

public KeyboardListenRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

public void setOnKeyboardStateChangedListener(IOnKeyboardStateChangedListener onKeyboardStateChangedListener) {
this.onKeyboardStateChangedListener = onKeyboardStateChangedListener;
}

@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(onKeyboardStateChangedListener != null) {
onKeyboardStateChangedListener.onKeyboardStateChanged(KEYBOARD_STATE_INIT);
}
} else {
mHeight = mHeight < b ? b : mHeight;
}

if(mHasInit && mHeight > b) {
mHasKeyboard = true;
if(onKeyboardStateChangedListener != null) {
onKeyboardStateChangedListener.onKeyboardStateChanged(KEYBOARD_STATE_SHOW);
}
}
if(mHasInit && mHasKeyboard && mHeight == b) {
mHasKeyboard = false;
if(onKeyboardStateChangedListener != null) {
onKeyboardStateChangedListener.onKeyboardStateChanged(KEYBOARD_STATE_HIDE);
}
}
}

public interface IOnKeyboardStateChangedListener {
public void onKeyboardStateChanged(int state);
}
}

package com.demo.softkeyboard;

import com.demo.softkeyboard.KeyboardListenRelativeLayout.IOnKeyboardStateChangedListener;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

/**
* 软键盘监听Demo
* @author qiaoning
*
*/
public class SoftKeyboardListenDemoActivity extends Activity {

private EditText editText;
KeyboardListenRelativeLayout relativeLayout;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

relativeLayout = (KeyboardListenRelativeLayout) findViewById(R.id.keyboardRelativeLayout);
editText = (EditText) findViewById(R.id.editText);

relativeLayout.setOnKeyboardStateChangedListener(new IOnKeyboardStateChangedListener() {

public void onKeyboardStateChanged(int state) {
switch (state) {
case KeyboardListenRelativeLayout.KEYBOARD_STATE_HIDE://软键盘隐藏
editText.setVisibility(View.VISIBLE);
break;
case KeyboardListenRelativeLayout.KEYBOARD_STATE_SHOW://软键盘显示
editText.setVisibility(View.GONE);
break;
default:
break;
}
}
});
}
}

<?xml version="1.0" encoding="utf-8"?>
<com.demo.softkeyboard.KeyboardListenRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/keyboardRelativeLayout"
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">
<EditText android:id="@+id/editText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</ScrollView>
</com.demo.softkeyboard.KeyboardListenRelativeLayout>