public class SlidingMenu extends HorizontalScrollView

{

private LinearLayout mWapper;

private ViewGroup mMenu;

private ViewGroup mContent;

private int mScreenWidth;

private int mMenuWidth;

// dp

private int mMenuRightPadding =0;

private boolean once;

private boolean isOpen;

/**

* 未使用自定義屬性時，調(diào)用

*?

* @param context

* @param attrs

*/

public SlidingMenu(Context context, AttributeSet attrs)

{

this(context, attrs, 0);

}

/**

* 當使用了自定義屬性時，會調(diào)用此構(gòu)造方法

*?

* @param context

* @param attrs

* @param defStyle

*/

public SlidingMenu(Context context, AttributeSet attrs, int defStyle)

{

super(context, attrs, defStyle);

// 獲取我們定義的屬性

TypedArray a = context.getTheme().obtainStyledAttributes(attrs,

R.styleable.SlidingMenu, defStyle, 0);

int n = a.getIndexCount();

for (int i = 0; i < n; i++)

{

int attr = a.getIndex(i);

switch (attr)

{

case R.styleable.SlidingMenu_rightPadding:

mMenuRightPadding = a.getDimensionPixelSize(attr,

(int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, 0, context

.getResources().getDisplayMetrics()));

break;

}

}

a.recycle();

WindowManager wm = (WindowManager) context

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics outMetrics = new DisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

mScreenWidth = outMetrics.widthPixels;

}

public SlidingMenu(Context context)

{

this(context, null);

}

/**

* 設置子View的寬和高 設置自己的寬和高

*/

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

{

if (!once)

{

mWapper = (LinearLayout) getChildAt(0);

mMenu = (ViewGroup) mWapper.getChildAt(0);

mContent = (ViewGroup) mWapper.getChildAt(1);

mMenuWidth = mMenu.getLayoutParams().width = mScreenWidth

- mMenuRightPadding;

mContent.getLayoutParams().width = mScreenWidth;

once = true;

}

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

/**

* 通過設置偏移量，將menu隱藏

*/

@Override

protected void onLayout(boolean changed, int l, int t, int r, int b)

{

super.onLayout(changed, l, t, r, b);

if (changed)

{

this.scrollTo(mMenuWidth, 0);

}

}

@Override

public boolean onTouchEvent(MotionEvent ev)

{

int action = ev.getAction();

switch (action)

{

case MotionEvent.ACTION_UP:

// 隱藏在左邊的寬度

int scrollX = getScrollX();

if (scrollX >= mMenuWidth / 2)

{

this.smoothScrollTo(mMenuWidth, 0);

isOpen = false;

} else

{

this.smoothScrollTo(0, 0);

isOpen = true;

}

return true;

}

return super.onTouchEvent(ev);

}

/**

* 打開菜單

*/

public void openMenu()

{

if (isOpen)

return;

this.smoothScrollTo(0, 0);

isOpen = true;

}

public void closeMenu()

{

if (!isOpen)

return;

this.smoothScrollTo(mMenuWidth, 0);

isOpen = false;

}

/**

* 切換菜單

*/

public void toggle()

{

if (isOpen)

{

closeMenu();

} else

{

openMenu();

}

}

}