Android 软键盘的打开关闭监听

软键盘的事件监听，通常软键盘的收起方式大致3种：
1.点击软键盘右下角的Return按钮（系统收起）
2.输入框焦点时按返回按钮（系统收起）
3.点击软键盘和输入框的外部（自发收起）
4.点击软键盘自带的收起按钮（软键盘收起）

前三种事件可以监听，方式都比较简单

1.点击软键盘右下角的Return按钮

给输入框设置监听
editText.setOnEditorActionListener(new OnEditorActionListener() {
@Override
public boolean onEditorAction(final TextView v, final int actionId, final KeyEvent event) {
// 可捕捉右下角的Return按钮
//添加抛出收起事件代码
return false;
}
});

2.输入框焦点时按返回按钮

给输入框增加按钮监听
editText.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (listener != null) {
// 可添加抛出收起事件代码
}
return true;
}
return false;
}
});

3.点击软键盘和输入框的外部

给输入框的父容器增加触摸监听
@Override
public boolean onTouchEvent(MotionEvent event) {

if (indexOfChild(editText) > -1) {
// 可添加抛出收起事件代码
}
return super.onTouchEvent(event);
}

4.点击软键盘自带的收起按钮（软键盘收起）

问题卡在此处，经过资料的搜查，还是么能找到软键盘收起按钮事件监听的办法，最后在stackoverflow网站找到了从布局高度的变化来判断软键盘的打开和收起事件。

import android.graphics.Rect;    import android.view.View;    import android.view.ViewTreeObserver;    import java.util.LinkedList;    import java.util.List;    public class SoftKeyboardStateHelper implements ViewTreeObserver.OnGlobalLayoutListener {        public interface SoftKeyboardStateListener {            void onSoftKeyboardOpened(int keyboardHeightInPx);            void onSoftKeyboardClosed();        }        private final List<SoftKeyboardStateListener> listeners = new LinkedList<SoftKeyboardStateListener>();        private final View activityRootView;        private int        lastSoftKeyboardHeightInPx;        private boolean    isSoftKeyboardOpened;        public SoftKeyboardStateHelper(View activityRootView) {            this(activityRootView, false);        }        public SoftKeyboardStateHelper(View activityRootView, boolean isSoftKeyboardOpened) {            this.activityRootView     = activityRootView;            this.isSoftKeyboardOpened = isSoftKeyboardOpened;            activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(this);        }        @Override        public void onGlobalLayout() {            final Rect r = new Rect();            //r will be populated with the coordinates of your view that area still visible.            activityRootView.getWindowVisibleDisplayFrame(r);            final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);            if (!isSoftKeyboardOpened && heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...                isSoftKeyboardOpened = true;                notifyOnSoftKeyboardOpened(heightDiff);            } else if (isSoftKeyboardOpened && heightDiff < 100) {                isSoftKeyboardOpened = false;                notifyOnSoftKeyboardClosed();            }        }        public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {            this.isSoftKeyboardOpened = isSoftKeyboardOpened;        }        public boolean isSoftKeyboardOpened() {            return isSoftKeyboardOpened;        }        /**       * Default value is zero (0)       * @return last saved keyboard height in px       */        public int getLastSoftKeyboardHeightInPx() {            return lastSoftKeyboardHeightInPx;        }        public void addSoftKeyboardStateListener(SoftKeyboardStateListener listener) {            listeners.add(listener);        }        public void removeSoftKeyboardStateListener(SoftKeyboardStateListener listener) {            listeners.remove(listener);        }        private void notifyOnSoftKeyboardOpened(int keyboardHeightInPx) {            this.lastSoftKeyboardHeightInPx = keyboardHeightInPx;            for (SoftKeyboardStateListener listener : listeners) {                if (listener != null) {                    listener.onSoftKeyboardOpened(keyboardHeightInPx);                }            }        }        private void notifyOnSoftKeyboardClosed() {            for (SoftKeyboardStateListener listener : listeners) {                if (listener != null) {                    listener.onSoftKeyboardClosed();                }            }        }    }    

代码的使用：

[java] view plain copyfinal SoftKeyboardStateHelper softKeyboardStateHelper = new SoftKeyboardStateHelper(findViewById(R.id.activity_main_layout);          softKeyboardStateHelper.addSoftKeyboardStateListener(...)  

这样能一并解决以上4种情况，比较好的监听软键盘的打开和收起事件，目前正在使用中。

原文 ：监听软键盘打开收起事件（软键盘自带收起按钮）