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android 监听软键盘弹出和隐藏

参考：
http://blog.csdn.net/u011181222/article/details/52043001

工具类：
public class SoftKeyBoardListener {
private View rootView;//activity的根视图
int rootViewVisibleHeight;//纪录根视图的显示高度
private OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener;

public SoftKeyBoardListener(Activity activity) {
    //获取activity的根视图
    rootView = activity.getWindow().getDecorView();

    //监听视图树中全局布局发生改变或者视图树中的某个视图的可视状态发生改变
    rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            //获取当前根视图在屏幕上显示的大小
            Rect r = new Rect();
            rootView.getWindowVisibleDisplayFrame(r);

            int visibleHeight = r.height();
            System.out.println(""+visibleHeight);
            if (rootViewVisibleHeight == 0) {
                rootViewVisibleHeight = visibleHeight;
                return;
            }

            //根视图显示高度没有变化，可以看作软键盘显示／隐藏状态没有改变
            if (rootViewVisibleHeight == visibleHeight) {
                return;
            }

            //根视图显示高度变小超过200，可以看作软键盘显示了
            if (rootViewVisibleHeight - visibleHeight > 200) {
                if (onSoftKeyBoardChangeListener != null) {
                    onSoftKeyBoardChangeListener.keyBoardShow(rootViewVisibleHeight - visibleHeight);
                }
                rootViewVisibleHeight = visibleHeight;
                return;
            }

            //根视图显示高度变大超过200，可以看作软键盘隐藏了
            if (visibleHeight - rootViewVisibleHeight > 200) {
                if (onSoftKeyBoardChangeListener != null) {
                    onSoftKeyBoardChangeListener.keyBoardHide(visibleHeight - rootViewVisibleHeight);
                }
                rootViewVisibleHeight = visibleHeight;
                return;
            }

        }
    });
}

private void setOnSoftKeyBoardChangeListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
    this.onSoftKeyBoardChangeListener = onSoftKeyBoardChangeListener;
}

public interface OnSoftKeyBoardChangeListener {
    void keyBoardShow(int height);

    void keyBoardHide(int height);
}

public static void setListener(Activity activity, OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
    SoftKeyBoardListener softKeyBoardListener 
    = new SoftKeyBoardListener(activity);
    softKeyBoardListener.setOnSoftKeyBoardChangeListener(onSoftKeyBoardChangeListener);
}

}

activity中调用：
SoftKeyBoardListener.setListener(AdjustResizeActivity.this, new SoftKeyBoardListener.OnSoftKeyBoardChangeListener() {
@Override
public void keyBoardShow(int height) {
Toast.makeText(AdjustResizeActivity.this, “键盘显示 高度” + height, Toast.LENGTH_SHORT).show();
}

        @Override
        public void keyBoardHide(int height) {
            Toast.makeText(AdjustResizeActivity.this, "键盘隐藏 高度" + height, Toast.LENGTH_SHORT).show();
        }
    });

遇到问题：title被软键盘顶上
解决办法：在layout嵌套scrollview