检测软键盘的弹起与隐藏【绝对经典，好用】
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。
转自：http://www.eoeandroid.com/thread-157446-1-1.html
1. 新建一个布局类KeyboardLayout
/** * @文件名: KeyboardLayout.java * @包 com.nhii.widget * @描述: TODO(用一句话描述该文件做什么) * @作者：MaLijun * @创建时间 2013-12-15 上午10:16:37 * @版本 V1.0 */package com.nhii.widget;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;}@Overrideprotected 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);}}package com.nhii.ui;import android.content.pm.ActivityInfo;import android.os.Bundle;import android.view.Window;import android.widget.Toast;import com.nhii.R;import com.nhii.widget.KeyboardLayout;import com.nhii.widget.KeyboardLayout.onKybdsChangeListener;import com.ta.annotation.TAInjectView;public class TestPageActivity extends BaseActivity {@TAInjectView(id = R.id.keyboardLayout1)KeyboardLayout mainView;@Overrideprotected void onPreOnCreate(Bundle savedInstanceState) {super.onPreOnCreate(savedInstanceState);// 取消标题this.requestWindowFeature(Window.FEATURE_NO_TITLE);// 竖屏锁定this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}@Overrideprotected void onAfterSetContentView() {super.onAfterSetContentView();mainView.setOnkbdStateListener(new onKybdsChangeListener() {public void onKeyBoardStateChange(int state) {switch (state) {case KeyboardLayout.KEYBOARD_STATE_HIDE:Toast.makeText(getApplicationContext(), "软键盘隐藏", Toast.LENGTH_SHORT).show();break; case KeyboardLayout.KEYBOARD_STATE_SHOW:Toast.makeText(getApplicationContext(), "软键盘弹起", Toast.LENGTH_SHORT).show();break;}}}); }}<com.nhii.widget.KeyboardLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/keyboardLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/light_pink" android:orientation="vertical" > <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="fill_parent" android:orientation="vertical" > <EditText android:id="@+id/testone_et" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入..." /> </LinearLayout> </ScrollView></com.nhii.widget.KeyboardLayout>