是否有可能在Java中，Android的编程方式创建的图像？ [英] Is it possible to create image programatically on Java, Android?

问题描述

我需要在我的Andr​​oid应用程序创建.JPEG / .png文件编程。我有简单的图像（黑色背景），它需要编程写些文字就可以了。我该怎么办呢？可能吗？

I need to create .jpeg/.png file on my Android application programatically. I have simple image (black background), and it need to write some text on it programatically. How can I do it? Is it possible?

推荐答案

这是肯定可以的。

为您加载图像到一个位图对象的图像上书写文字。然后绘制位图的画布和颜料等功能。当你完成绘图，你只需输出的位图文件。

To write text on an image you have to load the image in to a Bitmap object. Then draw on that bitmap with the Canvas and Paint functions. When you're done drawing you simply output the Bitmap to a file.

如果你仅仅使用一个黑色的背景，它可能是更好地为您简单地创建一个画布上空白位图，填充黑色，绘制文本，然后转储到一个位图。

If you're just using a black background, it's probably better for you to simply create a blank bitmap on a canvas, fill it black, draw text and then dump to a Bitmap.

我使用本教程学习画布和颜料的基本知识。

这是在code，你将寻找把画布中的图像文件：

This is the code that you'll be looking for to turn the canvas in to an image file:

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); 
}

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