Java ImageView.getLocationOnScreen方法代碼示例

import android.widget.ImageView; //導入方法依賴的package包/類
void convertTargetInfo(ImageView tarView, Context context) {
    if (tarView == null || tarView.getDrawable() == null) {
        throw new NullPointerException("target ImageView or ImageView drawable must not null");
    }

    //get target ImageView info
    tarView.getImageMatrix().getValues(mTargetValues);
    Rect tarRect = tarView.getDrawable().getBounds();
    mTargetWidth = (int) (tarRect.width() * mTargetValues[Matrix.MSCALE_X]);
    mTargetHeight = (int) (tarRect.height() * mTargetValues[Matrix.MSCALE_Y]);

    mTargetViewWidth = tarView.getWidth();
    mTargetViewHeight = tarView.getHeight();
    tarView.getLocationOnScreen(mTargetLocation);

    init(context);
}
 

import android.widget.ImageView; //導入方法依賴的package包/類
public void convertOriginalInfo(ImageView oriView) {
    if (oriView == null || oriView.getDrawable() == null) {
        throw new NullPointerException("original ImageView or ImageView drawable must not null");
    }

    //get original ImageView info
    oriView.getImageMatrix().getValues(mOriginalValues);
    Rect oriRect = oriView.getDrawable().getBounds();
    mOriginalWidth = (int) (oriRect.width() * mOriginalValues[Matrix.MSCALE_X]);
    mOriginalHeight = (int) (oriRect.height() * mOriginalValues[Matrix.MSCALE_Y]);

    mOriginalViewWidth = oriView.getWidth();
    mOriginalViewHeight = oriView.getHeight();
    oriView.getLocationOnScreen(mOriginalLocation);
}
 

import android.widget.ImageView; //導入方法依賴的package包/類
/**
 * Returns the bitmap position inside an imageView.
 *
 * @param imageView source ImageView
 *
 * @return 0: left, 1: top, 2: width, 3: height
 */
public static int[] getDisplayedImageLocation(ImageView imageView) {
  int[] ret = new int[4];

  if (imageView == null || imageView.getDrawable() == null)
    return ret;

  // Get image dimensions
  // Get image matrix values and place them in an array
  float[] f = new float[9];
  imageView.getImageMatrix().getValues(f);

  // Extract the scale values using the constants (if aspect ratio maintained, scaleX == scaleY)
  final float scaleX = f[Matrix.MSCALE_X];
  final float scaleY = f[Matrix.MSCALE_Y];

  // Get the drawable (could also get the bitmap behind the drawable and getWidth/getHeight)
  final Drawable d = imageView.getDrawable();
  final int origW = d.getIntrinsicWidth();
  final int origH = d.getIntrinsicHeight();

  // Calculate the actual dimensions
  final int actW = Math.round(origW * scaleX);
  final int actH = Math.round(origH * scaleY);

  ret[2] = actW;
  ret[3] = actH;

  // Get image position
  // We assume that the image is centered into ImageView
  int imgViewW = imageView.getWidth();
  int imgViewH = imageView.getHeight();

  int[] imgViewScreenLoc = new int[2];
  imageView.getLocationOnScreen(imgViewScreenLoc);

  // get the actual image location inside its image view
  int left = imgViewScreenLoc[0] + (imgViewW - actW) / 2;
  int top = imgViewScreenLoc[1] + (imgViewH - actH) / 2;

  ret[0] = left;
  ret[1] = top;

  return ret;
}