Android-监听软键盘状态

检测软键盘是否显示或隐藏的功能，下面展示下效果图:

我们接下来看实现：

activity_main_xml:

<com.zihao.view.InputMethodLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/input_method_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/title_tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="这是一个软键盘监听Demo" />

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@id/title_tv" >

        <EditText
            android:id="@+id/mEdit"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:hint="监听软键盘是否弹出" />
    </ScrollView>

</com.zihao.view.InputMethodLayout>

InputMethodLayout.java:

package com.zihao.view;

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

/**
 * 一个继承自RelativeLayout的输入法监听布局
 * 
 */
public class InputMethodLayout extends RelativeLayout {

private static final String TAG = "InputMethodLayout";
/** 初始化状态 **/
public static final byte KEYBOARD_STATE_INIT = -1;
/** 隐藏状态 **/
public static final byte KEYBOARD_STATE_HIDE = -2;
/** 打开状态 **/
public static final byte KEYBOARD_STATE_SHOW = -3;
private boolean isInit;// 是否为初始化状态
private boolean hasKeybord;// 标识是否打开了软键盘
private int viewHeight;// 布局高度
private onKeyboardsChangeListener keyboarddsChangeListener;// 键盘状态监听

public InputMethodLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}

public InputMethodLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}

public InputMethodLayout(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

/**
 * 设置软键盘状态监听
 * 
 * @param listener
 */
public void setOnkeyboarddStateListener(onKeyboardsChangeListener listener) {
keyboarddsChangeListener = listener;
}

/**
 * 布局状态发生改变时，会触发onLayout
 */
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
if (!isInit) {
isInit = true;
viewHeight = b;
keyboardSateChange(KEYBOARD_STATE_INIT);
} else {
viewHeight = viewHeight < b ? b : viewHeight;
}
if (isInit && viewHeight > b) {
hasKeybord = true;
keyboardSateChange(KEYBOARD_STATE_SHOW);
Log.w(TAG, "显示软键盘");
}
if (isInit && hasKeybord && viewHeight == b) {
hasKeybord = false;
keyboardSateChange(KEYBOARD_STATE_HIDE);
Log.w(TAG, "隐藏软键盘");
}
}

/**
 * 切换软键盘状态
 * 
 * @param state
 *            // 状态
 */
public void keyboardSateChange(int state) {
if (keyboarddsChangeListener != null) {
keyboarddsChangeListener.onKeyBoardStateChange(state);
}
}

/**
 * 软键盘状态切换监听
 * 
 * @author zihao
 * 
 */
public interface onKeyboardsChangeListener {
public void onKeyBoardStateChange(int state);
}
}

MainActivity.java

package com.zihao;

import com.zihao.view.InputMethodLayout;
import com.zihao.view.InputMethodLayout.onKeyboardsChangeListener;

import android.os.Bundle;
import android.widget.Toast;
import android.app.Activity;

public class MainActivity extends Activity {

private InputMethodLayout layout;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}

/**
 * 初始化视图
 */
private void initView() {
layout = (InputMethodLayout) findViewById(R.id.input_method_layout);
layout.setOnkeyboarddStateListener(new onKeyboardsChangeListener() {// 监听软键盘状态

@Override
public void onKeyBoardStateChange(int state) {
// TODO Auto-generated method stub
switch (state) {
case InputMethodLayout.KEYBOARD_STATE_SHOW:
Toast.makeText(MainActivity.this, "打开软键盘", 1000).show();
break;
case InputMethodLayout.KEYBOARD_STATE_HIDE:
Toast.makeText(MainActivity.this, "关闭软键盘", 1000).show();
break;
}
}
});
}
}

图片显示的功能就实现啦！

下载地址如下：

http://download.csdn.net/detail/hehaiminginadth/9104141