在jpg图像上绘制文本

Question

我有一个作为字节数组的jpg图像。我如何将这个字节数组转储到一个jpg中并写入到它的canavas中，然后将其保存到SD卡上？

欢迎任何想法。谢谢。

Answer 1

使用BitmapFactory.decodeByteArray()获取一个Bitmap，然后使用该位图创建一个Canvas，并在其中绘制文本。最后，使用Bitmap.compress()保存它

Bitmap bmp = BitmapFactory.decodeByteArray(myArray, 0, myArray.length).copy(Bitmap.Config.RGBA_8888, true); //myArray is the byteArray containing the image. Use copy() to create a mutable bitmap. Feel free to change the config-type. Consider doing this in two steps so you can recycle() the immutable bitmap.
Canvas canvas = new Canvas(bmp);
canvas.drawText("Hello Image", xposition, yposition, textpaint); //x/yposition is where the text will be drawn. textpaint is the Paint object to draw with.

OutputStream os = new FileOutputStream(dstfile); //dstfile is a File-object that you want to save to. You probably need to add some exception-handling here.
bmp.compress(CompressFormat.JPG, 100, os); //Output as JPG with maximum quality.
os.flush();
os.close();//Don't forget to close the stream.

Answer 2

1. 解码字节数组使用BitmapFactory
   1. Create a bitmap text on SD storage

to SD storage

1. toSD storage

​

希望这能有所帮助。