如何将位图转换为Android的JPEG文件？ [英] How to convert a bitmap to a jpeg file in Android?

问题描述

我在这里失去了一点点。我有一个位图从裁剪的图像转换为JPEG格式文件。我看过其他相关的问题，但他们都不相对于我的。 （大部分被恢复的文件，以位图）

I'm a little bit lost here. I have to convert a bitmap from a cropped image to an .jpeg file. I have looked to other related questions but none of them were relative to mine. (most were reverted as file to bitmap)

在此先感谢

PS。第一次Android开发

ps. first time Android development

推荐答案

使用这样的：

Bitmap bmp = null;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.jpeg, 100, stream);
byte[] byteArray = stream.toByteArray();

对于您可以使用此：

for that you can use this:

    FileInputStream fileInputStream=null;

    File file = new File("yourfile");

    byteArray = new byte[(int) file.length()];

    try {
        //convert file into array of bytes
    fileInputStream = new FileInputStream(file);
    fileInputStream.read(bFile);
    fileInputStream.close();

    //convert array of bytes into file
    FileOutputStream fileOuputStream = 
              new FileOutputStream("C:\\testing2.txt"); 
    fileOuputStream.write(bFile);
    fileOuputStream.close();

    System.out.println("Done");
    }catch(Exception e){
        e.printStackTrace();
    }

，也为更多的信息去与这里

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