I come again for an android brain idea!
I would like to put a circle hole hole in a imageView which bitmap is scaled as centerCrop. I know where I need to put the circle hole( in dp from left and bottom) and the hole radius. But don't know how to build it!
I know that I can use Porterduff to do the hole but what you suggest to do?
Thanks
Following Answers there is my CustomImage with hole:
public class MyImageView extends ImageView {
private AttributeSet attrs;
private float y;
private float x;
private float r;
private Paint paint;
private Rect mSrcRect;
private Rect mDestRect;
private Bitmap mBitmap;
private int alreadycalled = 0;
public MyImageView(Context context, AttributeSet attrs) {
super(context, attrs);
this.attrs = attrs;
initView();
}
public MyImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.attrs = attrs;
initView();
}
public MyImageView(Context context, float x, float y, float radius) {
super(context);
this.x = x;
this.y = y;
this.r = radius;
Log.d("parameters", String.format("left:%s , right:%s, radius:%s", String.valueOf(x), String.valueOf(y), String.valueOf(r)));
initView();
}
private void initView() {
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setStrokeWidth(10);
paint.setColor(0xff000000);
}
@Override
protected void onDraw(Canvas canvas) {
alreadycalled++;
Log.d("alreadycalled", "called " + alreadycalled);
Drawable mDrawable = getDrawable();
if (mDrawable == null) {
return; // couldn't resolve the URI
}
int dWidth = mDrawable.getIntrinsicWidth();
int dHeight = mDrawable.getIntrinsicHeight();
float scale = 1.0f;
scale = Math.max(getWidth() * 1.0f / dWidth, getHeight()
* 1.0f / dHeight);
int nWidth = (int) (dWidth * scale);
int nHeight = (int) (dHeight * scale);
int offsetLeft = (nWidth - getWidth()) / 2;
int offsetTop = (nHeight - getHeight()) / 2;
mBitmap = ((BitmapDrawable) mDrawable).getBitmap();
//custom mSrcRect mDestRect to achieve centerCrop
mSrcRect = new Rect(0, 0, dWidth, dWidth);
mDestRect = new Rect(-offsetLeft, -offsetTop, getWidth() + offsetLeft, getHeight() + offsetTop);
Log.d("src", mSrcRect.toString());
Log.d("dest", mDestRect.toString());
int sc = canvas.saveLayer(0, 0, getWidth(), getHeight(), null,
Canvas.MATRIX_SAVE_FLAG | Canvas.CLIP_SAVE_FLAG
| Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
| Canvas.FULL_COLOR_LAYER_SAVE_FLAG
| Canvas.CLIP_TO_LAYER_SAVE_FLAG);
paint.setColor(0xffffffff);
canvas.drawBitmap(mBitmap, mSrcRect, mDestRect, paint);
paint.setColor(0xffff0000);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
Log.d("position", String.format("%s , %s", String.valueOf(x), String.valueOf(y)));
canvas.drawCircle(x, y, r, paint);
paint.setXfermode(null);
canvas.restoreToCount(sc);
}
I called it programmatically with theses lines :
BitmapDrawable bd=(BitmapDrawable) getResources().getDrawable(R.drawable.triangle_bas_accueil2);
MyImageView customImView = new MyImageView(getApplicationContext(), mX, mY, mRadius);
customImView.setImageDrawable(bd);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.BOTTOM;
customImView.setLayoutParams(params);
down_relative.addView(customImView);
But the onDraw() method is called twice (maybe it needs) but that makes me two holes, one that I can change parameters but the other still at the same place ! The container of the MyImageView is a RelativeLayout.
If someOne has an idea? @tiny-sunlight ?
This one is just for CenterCrop and can't deal with scaleType.And this code may have some problems because I'm not good at canvas.
public class MyImageView extends ImageView {
private final AttributeSet attrs;
private Paint paint;
private Rect mSrcRect;
private Rect mDestRect;
private Bitmap mBitmap;
public MyImageView(Context context, AttributeSet attrs) {
super(context, attrs);
this.attrs = attrs;
initView();
}
public MyImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.attrs = attrs;
initView();
}
private void initView() {
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setStrokeWidth(10);
paint.setColor(0xff000000);
}
@Override
protected void onDraw(Canvas canvas) {
// super.onDraw(canvas);
//create the drawable.Maybe you can cache it.
Drawable mDrawable = (BitmapDrawable) getResources().getDrawable(R.drawable.triangle_bas_accueil2);
if (mDrawable == null) {
return; // couldn't resolve the URI
}
int dWidth = mDrawable.getIntrinsicWidth();
int dHeight = mDrawable.getIntrinsicHeight();
float scale = 1.0f;
scale = Math.max(getWidth() * 1.0f / dWidth, getHeight()
* 1.0f / dHeight);
int nWidth = (int) (dWidth*scale);
int nHeight = (int) (dHeight*scale);
int offsetLeft = (nWidth - getWidth())/2;
int offsetTop = (nHeight - getHeight())/2;
//cache mBitmap
mBitmap = mBitmap == null ? ((BitmapDrawable) mDrawable).getBitmap(): mBitmap;
//custom mSrcRect mDestRect to achieve centerCrop
mSrcRect = new Rect(0, 0, dWidth, dWidth);
mDestRect = new Rect(-offsetLeft, -offsetTop,getWidth()+offsetLeft, getHeight()+offsetTop);
int x = 250;int r = 100;
int sc = canvas.saveLayer(0, 0, getWidth(), getHeight(), null,
Canvas.MATRIX_SAVE_FLAG | Canvas.CLIP_SAVE_FLAG
| Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
| Canvas.FULL_COLOR_LAYER_SAVE_FLAG
| Canvas.CLIP_TO_LAYER_SAVE_FLAG);
paint.setColor(0xffffffff);
canvas.drawBitmap(mBitmap,mSrcRect,mDestRect,paint);
paint.setColor(0xff000000);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
canvas.drawCircle(x,x,r,paint);
paint.setXfermode(null);
canvas.restoreToCount(sc);
}
}