getLocationInWindow和getLocationOnScreen的区别

Android
Android

一个控件在其父窗口中的坐标位置

View.getLocationInWindow(int[] location)

一个控件在其整个屏幕上的坐标位置
View.getLocationOnScreen(int[] location)

Alt text

getLocationInWindow是以B为原点的C的坐标
getLocationOnScreen以A为原点。
下面是getLocationOnScreen示例

下面是getLocationOnScreen示例

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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

getLocationOnScreen 的源码

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public void getLocationOnScreen(@Size(2) int[] outLocation) {
    getLocationInWindow(outLocation);

    final AttachInfo info = mAttachInfo;
    if (info != null) {
        outLocation[0] += info.mWindowLeft;
        outLocation[1] += info.mWindowTop;
    }
}

下面是getLocationInWindow示例

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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

getLocationInWindow 的源码

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public void getLocationInWindow(@Size(2) int[] outLocation) {
    if (outLocation == null || outLocation.length < 2) {
        throw new IllegalArgumentException("outLocation must be an array of two integers");
    }

    outLocation[0] = 0;
    outLocation[1] = 0;

    transformFromViewToWindowSpace(outLocation);
}


public void transformFromViewToWindowSpace(@Size(2) int[] inOutLocation) {
     if (inOutLocation == null || inOutLocation.length < 2) {
         throw new IllegalArgumentException("inOutLocation 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
         inOutLocation[0] = inOutLocation[1] = 0;
         return;
     }

     float position[] = mAttachInfo.mTmpTransformLocation;
     position[0] = inOutLocation[0];
     position[1] = inOutLocation[1];

     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;
     }

     inOutLocation[0] = Math.round(position[0]);
     inOutLocation[1] = Math.round(position[1]);
 }