Android 判断软键盘的状态（显示，隐藏）

先上截图，有图有真相：

自定义RelativeLayout

[java]
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 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);
   }
  }
 }
 
&n

补充：移动开发 , Android ,

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