Issue
I try to create like this drawable
I wrote code and almost working correctly
public class GetsugaDrawable extends Drawable {
private final Context context;
private final float radiusScale = 1.2f;
private final float yOffset = 0.3f;
private final int colorLower = Color.RED;
private final int colorUpper = Color.BLACK;
private final Paint upperPaint = new Paint();
public GetsugaDrawable(Context c) {
context = c;
upperPaint.setColor(colorUpper);
upperPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
}
@Override
public void draw(@NonNull Canvas canvas) {
final Rect bounds = new Rect(getBounds());
canvas.drawColor(colorLower, PorterDuff.Mode.SRC);
final float radius = radiusScale * bounds.height();
final int x = bounds.centerX();
final float y = (bounds.centerY() - bounds.height() * yOffset) - radius;
canvas.drawCircle(x, y, radius, upperPaint);
}
@Override
public void setAlpha(int alpha) {
// ignored TODO impl.
}
@Override
public void setColorFilter(@Nullable ColorFilter colorFilter) {
// ignored TODO impl.
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
}
Here is my result
I tried to change
private final int colorUpper = Color.BLACK;
with
private final int colorUpper = Color.TRANSPARENT;
but when I run my app again with transparent color, the result is like this
What am i doing wrong ? Thanks
Solution
Add upperPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
public class GetsugaDrawable extends Drawable {
private final Context context;
private final float radiusScale = 1.2f;
private final float yOffset = 0.3f;
private final int colorLower = Color.RED;
private final int colorUpper = Color.BLACK;
private final Paint upperPaint = new Paint();
public GetsugaDrawable(Context c) {
context = c;
upperPaint.setAntiAlias(true);
upperPaint.setColor(colorUpper);
upperPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
}
@Override
public void draw(@NonNull Canvas canvas) {
final Rect bounds = new Rect(getBounds());
canvas.drawColor(colorLower);
final float radius = radiusScale * bounds.height();
final int x = bounds.centerX();
final float y = (bounds.centerY() - bounds.height() * yOffset) - radius;
canvas.drawCircle(x, y, radius, upperPaint);
}
@Override
public void setAlpha(int alpha) {
}
@Override
public void setColorFilter(@Nullable ColorFilter colorFilter) {
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}}
And don't forget to view.setLayerType(View.LAYER_TYPE_HARDWARE, null); on target view
Answered By - Ravi Kant
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