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;}@Overrideprotected 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…
