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;

 }

 

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