Android监控软键盘变化实例

public class ResizeLayout extends FrameLayout {


    private OnkeyboardShowListener mChangedListener;
    private boolean misKeyboardshow = false;
    private RRSharedPreferences preferences;
    private int keyboardHeight = DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT);
    private final int THRESHOLD = 100;
    /**
     * @param context
     * @param attrs
     */
    public ResizeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        preferences = new RRSharedPreferences(context);
    }
    
    public static interface OnkeyboardShowListener {
        public void onKeyboardShow();
        public void onKeyboardHide();
        public void onKeyboardShowOver();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        if (oldh - h > THRESHOLD) { //键盘弹出了
            misKeyboardshow = true;
            keyboardHeight = oldh - h;
            preferences.putIntValue(Config.KEYBOARD_HIGHT, keyboardHeight);
            if (mChangedListener != null) {
                mChangedListener.onKeyboardShow();
            }
        } else if (h < oldh && misKeyboardshow) { //键盘变高了
            if (keyboardHeight == DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT)) {
                preferences.getIntValue(Config.KEYBOARD_HIGHT, DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT));
            }
            if (keyboardHeight != DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT)) {
                keyboardHeight += oldh - h;
                preferences.putIntValue(Config.KEYBOARD_HIGHT, keyboardHeight);
            }
            if (mChangedListener != null) {
                mChangedListener.onKeyboardShow();
            }
        } else if (h - oldh > THRESHOLD) { //键盘隐藏了
            misKeyboardshow = false;
            if (mChangedListener != null) {
                mChangedListener.onKeyboardHide();
            }
        } else if (h > oldh && misKeyboardshow) { //键盘收缩了
            if (keyboardHeight == DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT)) {
                preferences.getIntValue(Config.KEYBOARD_HIGHT, DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT));
            }
            if (keyboardHeight != DipUtil.calcFromDip(Config.DEFAULT_KEYBOARD_HIGHT)) {
                keyboardHeight -= h - oldh;
                preferences.putIntValue(Config.KEYBOARD_HIGHT, keyboardHeight);
            }
            if (mChangedListener != null) {
                mChangedListener.onKeyboardShow();
            }
        }
        CommonUtil.log("NCS", "keyboard height:"+ keyboardHeight);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right,
            int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        CommonUtil.log("NCS", "top:" + top + "--bottom:" + bottom);
        if (mChangedListener != null && misKeyboardshow) {
            mChangedListener.onKeyboardShowOver();
        }
    }
    
    public boolean isKeyboardShowing() {
        return misKeyboardshow;
    }

    public void setOnKeyboardShowListener(OnkeyboardShowListener listener) {
        mChangedListener = listener;
    }
}

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