是否可以在Java，Android上以编程方式创建图像？

Question

我需要以编程方式在我的Android应用程序上创建.jpeg/.png文件。我有简单的图像（黑色背景），它需要编写一些文本编程。我该怎么做？可能吗？

Answer 1

是，see here

Bitmap b = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888); 
Canvas c = new Canvas(b); 

您还可以使用AWT的Graphics2D的与this compatibility project

Answer 2

这是肯定可以的。

要在图像上写入文本，必须将图像加载到Bitmap对象中。然后用Canvas和Paint函数绘制该位图。完成绘图后，只需将位图输出到文件即可。

如果您只是使用黑色背景，最好在画布上创建空白位图，填充黑色，绘制文本然后转储到位图。

I used this tutorial to learn the basics of the canvas and paint.

这就是你要寻找的代码把画布中的图像文件：

OutputStream os = null; 
try { 
    File file = new File(dir, "image" + System.currentTimeMillis() + ".png"); 
    os = new FileOutputStream(file); 
    finalBMP.compress(CompressFormat.PNG, 100, os); 
    finalBMP.recycle(); // this is very important. make sure you always recycle your bitmap when you're done with it. 
    screenGrabFilePath = file.getPath(); 
} catch(IOException e) { 
    finalBMP.recycle(); // this is very important. make sure you always recycle your bitmap when you're done with it. 
    Log.e("combineImages", "problem combining images", e); 
} 

Answer 3

使用Graphics2d你可以创建一个PNG图像，以及：

public class Imagetest { 

    public static void main(String[] args) throws IOException { 
     File path = new File("image/base/path"); 
     BufferedImage img = new BufferedImage(100, 100, 
       BufferedImage.TYPE_INT_ARGB); 

     Graphics2D g2d = img.createGraphics(); 

     g2d.setColor(Color.YELLOW); 
     g2d.drawLine(0, 0, 50, 50); 

     g2d.setColor(Color.BLACK); 
     g2d.drawLine(50, 50, 0, 100); 

     g2d.setColor(Color.RED); 
     g2d.drawLine(50, 50, 100, 0); 

     g2d.setColor(Color.GREEN); 
     g2d.drawLine(50, 50, 100, 100); 

     ImageIO.write(img, "PNG", new File(path, "1.png")); 
    } 
}