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Bitmap上写文字
public Bitmap drawTextToBitmap(Context mContext, int resourceId, String mText) { try { Resources resources = mContext.getResources(); float scale = resources.getDisplayMetrics().density; Bitmap bitmap = BitmapFactory.decodeResource(resources, resourceId); 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(110,110, 110)); // text size in pixels paint.setTextSize((int) (12 * scale)); // text shadow paint.setShadowLayer(1f, 0f, 1f, Color.DKGRAY); // draw text to the Canvas center Rect bounds = new Rect(); paint.getTextBounds(mText, 0, mText.length(), bounds); int x = (bitmap.getWidth() - bounds.width())/6; int y = (bitmap.getHeight() + bounds.height())/5; canvas.drawText(mText, x * scale, y * scale, paint); return bitmap; } catch (Exception e) { // TODO: handle exception return null; } }
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