软键盘弹出和收回的三种方式

第一种

import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.widget.EditText;

/**
 *  拦截键盘向下的 EditTextView
 */
public class TextEditTextView extends EditText {
    public TextEditTextView(Context context) {
        super(context);
    }

    public TextEditTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TextEditTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }


    @Override
    public boolean onKeyPreIme(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == 1) {
            super.onKeyPreIme(keyCode, event);
            onKeyBoardHideListener.onKeyHide(keyCode, event);
            return false;
        }
        return super.onKeyPreIme(keyCode, event);
    }

    /**
     *键盘监听接口
     */
    OnKeyBoardHideListener onKeyBoardHideListener;
    public void setOnKeyBoardHideListener(OnKeyBoardHideListener onKeyBoardHideListener) {
        this.onKeyBoardHideListener = onKeyBoardHideListener;
    }

    public interface OnKeyBoardHideListener{
        void onKeyHide(int keyCode, KeyEvent event);
    }
}

为什么 重写 Activity.onKeyDown() 方法为什么没有用？而用的是 onKeyPreIme，该博客写的很明白http://blog.csdn.net/yxhuang2008/article/details/53822072，感谢该博客博主

用法

软键盘收回监听

//键盘隐藏监听
customized_edit.setOnKeyBoardHideListener(new TextEditTextView.OnKeyBoardHideListener(){

@Override
public void onKeyHide(int keyCode, KeyEvent event) {
    SysoutUtils.out("软键盘隐藏");
    customized_submit.setVisibility(View.VISIBLE);
}

});

第二种

软键盘弹出监听（通过高度计算，但是这种方式有问题，不推荐用）：

  
//键盘显示监听
customized_edit.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener(){
 
    //当键盘弹出隐藏的时候会 调用此方法。
    @Override
    public void onGlobalLayout() {
        final Rect rect = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
        final int screenHeight = activity.getWindow().getDecorView().getRootView().getHeight();
        Log.e("TAG",rect.bottom+"#"+screenHeight);
        final int heightDifference = screenHeight - rect.bottom;
        boolean visible = heightDifference > screenHeight / 3;
        if(visible){
            SysoutUtils.out("软键盘显示");
            customized_submit.setVisibility(View.GONE);
        }else {
            SysoutUtils.out("软键盘隐藏");
            customized_submit.setVisibility(View.VISIBLE);
        }
    }
});

第三种

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 onKeyboaddsChangeListener 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(onKeyboaddsChangeListener listener){
        mListener = listener;
    }
    @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 (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 onKeyboaddsChangeListener{
        public void onKeyBoardStateChange(int state);
    }
}

用法

//监听软件盘是否弹起
    private void onKeyBoardListener(){
        xxxEdittext.setOnkbdStateListener(new KeyboardLayout.onKeyboaddsChangeListener() {

            public void onKeyBoardStateChange(int state) {
                switch (state) {
                    case KeyboardLayout.KEYBOARD_STATE_HIDE:
//
                        UtilsToast.showToast("软键盘隐藏");
                        customized_submit.setVisibility(View.VISIBLE);
                        break;
                    case KeyboardLayout.KEYBOARD_STATE_SHOW:
                        UtilsToast.showToast("软键盘弹起");
                        customized_submit.setVisibility(View.INVISIBLE);
                        break;
                }
            }
        });
    }