是否可以在Java，Android上以编程方式创建图像？

问题描述

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），它需要以编程方式在其上写一些文字。我该怎么做？可能吗？

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

推荐答案

这绝对是可能的。

在图像上写文字您必须将图像加载到Bitmap对象。然后使用Canvas和Paint函数在该位图上绘制。当你完成绘图时，你只需将位图输出到一个文件。

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.

如果你只是使用黑色背景，你可能最好只创建一个空白画布上的位图，填充黑色，绘制文本然后转储到位图。

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.

这是您要将画布转换为图像文件的代码：

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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