Develop Reference

How to draw part of space between two circles in Android

I would like to draw in Android something like shape in the picture. I have used Path.drawArc but I can't draw two arcs which are parts of cirlces with the same center. Another problem is how to draw two lines which connect these arcs. In iOS I would use bezierPathWithArcCenter:radius:startAngle:endAngle:clockwise:
How to draw shape like in the sketch?

here is simple example using canvas and bitmaps, try this example and get some idea for your requirement. image cropping and transparent

draw canvas 3d rectangle

I Have extended View class and override draw method. In draw method I draw rectangle using canvas. but this rectangle is simple I need to show as blow. how can I draw rectangle like shown in below image?

create a Path for the top side using 4 points (moveTo and lineTo) and then draw it with Canvas.drawPath. Do the same for the right side

Here is the link for the HoloGraphLibrary. Just check it.
It has no 3d effect as you want but it has Same ui as you want. You will have to play little to have effect like 3d rectangle.
Try a look and let me know if it do not help you.
Enjoy Coding and All The Best. :)

Android: Custom masking 2 bitmaps layered one above the other

easy now.
What I want eventually:
I want to have 2 bitmaps overlayed on a view. Same bitmaps with the one above have higher brightness than the below one.
Now when the user strokes(with touch event (like paint brush)) on the upper bitmap, I want those parts of the upper bitmap to go invisible.
For those who are familiar with adobe photoshop perhaps this will make more sense:
I want to draw a mask on an image being display so that only the unmasked parts remain visible. But the mask can be drawn from a brush with variable hardness/size.
How do I achieve this functionality? Direct me in in the line where I should research or give sample code.
Also, is it possible to draw strokes on an imageview with a brush which has variable hardness? I know that I can drawPath and drawArc on a canvas, but I do not know how to achieve the different brush strokes/styles.
Please pardon me if I haven't phrased my question right, or wasn't able to find similar duplicates.

You can use FrameLayout to overlay one image over other in Android and for Custom Masking search FingerPaint on google.

I think the best way is to do your own off-screen compositing, then render the composited image using an ImageView or perhaps a subclass with custom interaction. See this sample code for an example of how to do such compositing using the Porter-Duff transfer modes.

Draw a Circle With Reverse Filling in Android

Not sure how to do this, or what the right terms are for describing this, but here goes:
I want to make a closing circle animation in my android app, much like the end of this video. I'm guessing what I need to do is somehow draw a black circle but instead of filling the inside of the circle fill the outside. How exactly would I do that, given the tools I have with Android's Canvas class?

Have you tried using clipPath to achieve this?
I was working on the same kind of thing and achieved it by using clipPath of canvas.

how to add gradient to my rectangle shape dynamically in android?

I have created rectangle shapes using onDraw method, filled with single colors. Now I have a requirement to add gradient effects to those rectangles. Now I have to fill each rectangle with multiple colors(i.e gradient effect). Could some one suggest me the way to do that. Any response would be great.
thanks in advance.

See the LinearGradient class in the Android graphics library.