KeyboardListenRelativeLayout.java

package com.yeetou.xinyongkaguanjia.component;

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);
		}
	}