Android 判斷軟鍵盤的狀态（顯示，隐藏）

先上截圖，有圖有真相：

自定義RelativeLayout

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);
	}
}
           

用法：

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;

/**
 * 軟鍵盤監聽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://軟鍵盤隐藏
					editText.setVisibility(View.VISIBLE);
					break;
				case KeyboardListenRelativeLayout.KEYBOARD_STATE_SHOW://軟鍵盤顯示
					editText.setVisibility(View.GONE);
					break;
				default:
					break;
				}
			}
		});
    }
}
           

使用到的布局檔案：

<?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>
           

源代碼： http://download.csdn.net/detail/qiaoning13256/4401259