Display certain version of adaptive icon as ImageView on Android

Question

When adding an adaptive icon to an ImageView in an Activity in Android, it seems to adopt the same version as OEM design. In my case right now this is the rounded version. But I want to display this as an icon in my main activity and thus want to use for example the square version with rounded corners. If this is possible, how can I achieve this? If this is not possible I can create a new resource, but it needs to use ic_launcher_background and ic_launcher_foreground so that the icon is not defined in multiple places.

This is my ic_launcher.xml :

<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@drawable/ic_launcher_background" />
    <foreground android:drawable="@drawable/ic_launcher_foreground" />
</adaptive-icon>

This is my ImageView :

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@mipmap/ic_launcher" />

Answer 1

Before telling the solution directly, you'd know how system draw an adaptive icon in a image view. It mainly contains three steps.

1. Draw a background.
2. Draw a foreground.
3. Set a transparent area with a mask.

If you put an adaptive icon into an ImageView , this steps will be completed automatically. Hence there will be a system defined mask on that. So your question is how to draw a customized mask there. Then let's see how we can achieve this.

1. Get the adaptive drawable as well as its layers.

    Drawable rawDrawable = getResources().getDrawable(R.mipmap.ic_launcher, null);
    Drawable foreground = rawDrawable.getForeground();
    Drawable background = rawDrawable.getBackground();

2. Create a bitmap with a customized size.

    Bitmap bitmap = Bitmap.createBitmap(bitmapSize, bitmapSize, Bitmap.Config.ARGB_8888);

3. Create a Canvas used for drawing drawable layers.

    Canvas canvas = new Canvas(bitmap);

4. Draw the layers.

    background.setBounds(0, 0, bitmapSize, bitmapSize);
    background.draw(canvas);
    foreground.setBounds(0, 0, bitmapSize, bitmapSize);
    foreground.draw(canvas);

5. After step 4, you will get an icon as a square version. And if you need to add round corners to it. You need to draw the mask yourself.

    Bitmap maskBitmap = Bitmap.createBitmap(bitmapSize, bitmapSize, Bitmap.Config.ARGB_8888);
    Canvas maskCanvas = new Canvas(maskBitmap);

    Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    xferPaint.setStyle(Paint.Style.FILL_AND_STROKE);
    xferPaint.setColor(Color.RED);
    maskCanvas.drawRoundRect(0,0,bitmapSize, bitmapSize, 12, 12, xferPaint);

    xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
    canvas.drawBitmap(maskBitmap, 0, 0, xferPaint);

6. Then put the bitmap into the ImageView ,

    ((ImageView) findViewById(R.id.imageView)).setImageBitmap(bitmap);