我的Android进阶之旅------&gt;android中getLocationInWindow 和 getLocationOnScreen的差别

花门楼前见秋草，岂能贫贱相看老。这篇文章主要讲述我的Android进阶之旅------& gt; android中getLocationInWindow 和 getLocationOnScreen的差别相关的知识，希望能为你提供帮助。
View.getLocationInWindow(int[] location)
一个控件在其父窗体中的坐标位置
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。

以下是getLocationOnScreen演示样例

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

以下是getLocationInWindow演示样例

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; } }

==================================================================================== 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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