Android监听的软键盘的状态

有时候需要判断该软键盘是否弹出：

方法1：
通过InputMethodManager类来判断，但是isActive()判断并不准确，有的时候你的键盘已经关闭了，但是依然返回ture。

InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); //得到InputMethodManager的实例
if (imm.isActive()) {//如果开启
 imm.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT,InputMethodManager.HIDE_NOT_ALWAYS
 );//关闭/开启软键盘
}

方法2：
通过判断布局中的RelativeLayout的高度，Activity设置：

android:windowSoftInputMode="adjustResize"

然后键盘弹出的时候RelativeLayout会被挤压，从而高度发生变化，由此判断软键盘的状态。
为了方便使用，我们自定义一个RelativeLayout:

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

/** * 监听软键盘是否处于打开状态，使用方式RelativeLayout一样 */
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);
        Log.e(TAG, "b= " + b);
        if (!mHasInit) {
            mHasInit = true;
            mHeight = b;
            Log.e(TAG, "mHeight= " + b);
            if (onKeyboardStateChangedListener != null) {
                onKeyboardStateChangedListener.onKeyboardStateChanged(KEYBOARD_STATE_INIT);
            }
        } else {
            mHeight = mHeight < b ? b : mHeight;
        }

        if (mHasInit && mHeight > b) {                  //mHeight代表键盘的真实高度 ,b代表在窗口中的高度 mHeight>b 说明键盘隐藏
            mHasKeyboard = true;
            if (onKeyboardStateChangedListener != null) {
                onKeyboardStateChangedListener.onKeyboardStateChanged(KEYBOARD_STATE_SHOW);
            }
        }
        if (mHasInit && mHasKeyboard && mHeight == b) {  // mHeight = b 说明已经弹出
            mHasKeyboard = false;
            if (onKeyboardStateChangedListener != null) {
                onKeyboardStateChangedListener.onKeyboardStateChanged(KEYBOARD_STATE_HIDE);
            }
        }
    }

    public interface IOnKeyboardStateChangedListener {
        void onKeyboardStateChanged(int state);
    }
}

最后给mRelativeLayout设置一个监听：

mRelativeLayout.setOnKeyboardStateChangedListener(new KeyboardListenRelativeLayout.IOnKeyboardStateChangedListener() {

            public void onKeyboardStateChanged(int state) {
                switch (state) {
                    case KeyboardListenRelativeLayout.KEYBOARD_STATE_HIDE://软键盘隐藏
                        LogUtil.e("Keyboard", "软键盘隐藏");
                        break;
                    case KeyboardListenRelativeLayout.KEYBOARD_STATE_SHOW://软键盘显示
                        LogUtil.e("Keyboard", "软键盘显示");
                        break;
                    default:
                        break;
                }
            }
        });

参考不详…