/**
* Sets the content of this ImageView to the specified Uri.
*
* @param uri The Uri of an image
*/
public void setImageURI(Uri uri) {
if (mResource != 0 || (mUri != uri && (uri == null || mUri == null || !uri.equals(mUri)))) {
updateDrawable(null);
mResource = 0;
mUri = uri;
resolveUri();
requestLayout();
invalidate();
}
}
/**
* Sets a drawable as the content of this ImageView.
*
* @param resId the resource identifier of the the drawable
* @attr ref android.R.styleable#ImageView_src
*/
public void setImageResource(int resId) {
if (mUri != null || mResource != resId) {
updateDrawable(null);
mResource = resId;
mUri = null;
resolveUri();
requestLayout();
invalidate();
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
resolveUri();
int w;
int h;
// Desired aspect ratio of the view's contents (not including padding)
float desiredAspect = 0.0f;
// We are allowed to change the view's width
boolean resizeWidth = false;
// We are allowed to change the view's height
boolean resizeHeight = false;
if (mDrawable == null) {
// If no drawable, its intrinsic size is 0.
mDrawableWidth = -1;
mDrawableHeight = -1;
w = h = 0;
} else {
w = mDrawableWidth;
h = mDrawableHeight;
if (w <= 0) w = 1;
if (h <= 0) h = 1;
// We are supposed to adjust view bounds to match the aspect
// ratio of our drawable. See if that is possible.
if (mAdjustViewBounds) {
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
resizeWidth = widthSpecMode != MeasureSpec.EXACTLY;
resizeHeight = heightSpecMode != MeasureSpec.EXACTLY;
desiredAspect = (float) w / (float) h;
}
}
int pleft = mPaddingLeft;
int pright = mPaddingRight;
int ptop = mPaddingTop;
int pbottom = mPaddingBottom;
int widthSize;
int heightSize;
if (resizeWidth || resizeHeight) {
/* If we get here, it means we want to resize to match the
drawables aspect ratio, and we have the freedom to change at
least one dimension.
*/
// Get the max possible width given our constraints
widthSize = resolveAdjustedSize(w + pleft + pright, mMaxWidth, widthMeasureSpec);
// Get the max possible height given our constraints
heightSize = resolveAdjustedSize(h + ptop + pbottom, mMaxHeight, heightMeasureSpec);
if (desiredAspect != 0.0f) {
// See what our actual aspect ratio is
float actualAspect = (float) (widthSize - pleft - pright) / (heightSize - ptop - pbottom);
if (Math.abs(actualAspect - desiredAspect) > 0.0000001) {
boolean done = false;
// Try adjusting width to be proportional to height
if (resizeWidth) {
int newWidth = (int) (desiredAspect * (heightSize - ptop - pbottom)) + pleft + pright;
if (newWidth <= widthSize) {
widthSize = newWidth;
done = true;
}
}
// Try adjusting height to be proportional to width
if (!done && resizeHeight) {
int newHeight = (int) ((widthSize - pleft - pright) / desiredAspect) + ptop + pbottom;
if (newHeight <= heightSize) {
heightSize = newHeight;
}
}
}
}
} else {
/* We are either don't want to preserve the drawables aspect ratio,
or we are not allowed to change view dimensions. Just measure in
the normal way.
*/
w += pleft + pright;
h += ptop + pbottom;
w = Math.max(w, getSuggestedMinimumWidth());
h = Math.max(h, getSuggestedMinimumHeight());
widthSize = resolveSize(w, widthMeasureSpec);
heightSize = resolveSize(h, heightMeasureSpec);
}
setMeasuredDimension(widthSize, heightSize);
}
