android上在图片上动态添加文字的方法：
- 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;
- }
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