Java tutorial
//package com.java2s; // Licensed under the MIT license. import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; public class Main { public static Bitmap highlightSelectedFaceThumbnail(Bitmap originalBitmap) { Bitmap bitmap = originalBitmap.copy(Bitmap.Config.ARGB_8888, true); Canvas canvas = new Canvas(bitmap); Paint paint = new Paint(); paint.setAntiAlias(true); paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.parseColor("#3399FF")); int stokeWidth = Math.max(originalBitmap.getWidth(), originalBitmap.getHeight()) / 10; if (stokeWidth == 0) { stokeWidth = 1; } bitmap.getWidth(); paint.setStrokeWidth(stokeWidth); canvas.drawRect(0, 0, bitmap.getWidth(), bitmap.getHeight(), paint); return bitmap; } }