This short article shows you how to draw text on bitmap loaded from resources.
First we read bitmap from resources. This bitmap is immutable, so we create mutable copy. Then we create Paint object and set them text size, color, shadow, etc.
Now we are ready to draw! But where? We need to calculate postion of bottom left corner of drawed text. That's all. Enjoy!
public Bitmap drawTextToBitmap(Context gContext, int gResId, String gText) { Resources resources = gContext.getResources(); float scale = resources.getDisplayMetrics().density; Bitmap bitmap = BitmapFactory.decodeResource(resources, gResId); android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig(); // set default bitmap config if none if(bitmapConfig == null) { bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888; } // resource bitmaps are imutable, // so we need to convert it to mutable one bitmap = bitmap.copy(bitmapConfig, true); Canvas canvas = new Canvas(bitmap); // new antialised Paint Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // text color - #3D3D3D paint.setColor(Color.rgb(61, 61, 61)); // text size in pixels paint.setTextSize((int) (14 * scale)); // text shadow paint.setShadowLayer(1f, 0f, 1f, Color.WHITE); // draw text to the Canvas center Rect bounds = new Rect(); paint.getTextBounds(gText, 0, gText.length(), bounds); int x = (bitmap.getWidth() - bounds.width())/2; int y = (bitmap.getHeight() + bounds.height())/2; canvas.drawText(gText, x * scale, y * scale, paint); return bitmap; }
