小弟我的Android进阶之旅->android中getLocationInWindow 和 getLocationOnScreen的区别

我的Android进阶之旅------>android中getLocationInWindow 和 getLocationOnScreen的区别
View.getLocationInWindow(int[] location)

一个控件在其父窗口中的坐标位置

View.getLocationOnScreen(int[] location)

一个控件在其整个屏幕上的坐标位置

getLocationInWindow是以B为原点的C的坐标

getLocationOnScreen以A为原点。

下面是getLocationOnScreen示例

start = (Button) findViewById(R.id.start);		int []location=new int[2];		start.getLocationOnScreen(location);		int x=location[0];//获取当前位置的横坐标		int y=location[1];//获取当前位置的纵坐标

下面是getLocationInWindow示例

start = (Button) findViewById(R.id.start);		int []location=new int[2];		start.getLocationInWindow(location);		int x=location[0];//获取当前位置的横坐标		int y=location[1];//获取当前位置的纵坐标

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 附上源代码

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View.getLocationInWindow(int[] location)

/**     * <p>Computes the coordinates of this view in its window. The argument     * must be an array of two integers. After the method returns, the array     * contains the x and y location in that order.</p>     *     * @param location an array of two integers in which to hold the coordinates     */    public void getLocationInWindow(int[] location) {        if (location == null || location.length < 2) {            throw new IllegalArgumentException("location must be an array of two integers");        }        if (mAttachInfo == null) {            // When the view is not attached to a window, this method does not make sense            location[0] = location[1] = 0;            return;        }        float[] position = mAttachInfo.mTmpTransformLocation;        position[0] = position[1] = 0.0f;        if (!hasIdentityMatrix()) {            getMatrix().mapPoints(position);        }        position[0] += mLeft;        position[1] += mTop;        ViewParent viewParent = mParent;        while (viewParent instanceof View) {            final View view = (View) viewParent;            position[0] -= view.mScrollX;            position[1] -= view.mScrollY;            if (!view.hasIdentityMatrix()) {                view.getMatrix().mapPoints(position);            }            position[0] += view.mLeft;            position[1] += view.mTop;            viewParent = view.mParent;         }        if (viewParent instanceof ViewRootImpl) {            // *cough*            final ViewRootImpl vr = (ViewRootImpl) viewParent;            position[1] -= vr.mCurScrollY;        }        location[0] = (int) (position[0] + 0.5f);        location[1] = (int) (position[1] + 0.5f);    }

View.getLocationOnScreen(int[] location)

  /**     * <p>Computes the coordinates of this view on the screen. The argument     * must be an array of two integers. After the method returns, the array     * contains the x and y location in that order.</p>     *     * @param location an array of two integers in which to hold the coordinates     */    public void getLocationOnScreen(int[] location) {        getLocationInWindow(location);        final AttachInfo info = mAttachInfo;        if (info != null) {            location[0] += info.mWindowLeft;            location[1] += info.mWindowTop;        }    }

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  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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