如何在Android中将位图转换为jpeg文件？

How to convert a bitmap to a jpeg file in Android?

提问by Carlo Matulessy

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)

我有点迷失在这里。我必须将位图从裁剪图像转换为 .jpeg 文件。我查看了其他相关问题，但没有一个与我的相关。（大多数被恢复为文件到位图）

Thanks in advance

提前致谢

ps. first time Android development

附：第一次安卓开发

回答by Piyush

Use this:

用这个：

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

for that you can use this:

为此，您可以使用它：

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();
}

and also for more info go with here

以及更多信息去这里

回答by Karthi

Try this

尝试这个

bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outStream);

Here is a sample Program

这是一个示例程序

compressing-a-bitmap-to-jpg-format-android

压缩位图到 jpg 格式 android

回答by Pooja Sangle

I think this is what you need

我认为这就是你所需要的

bitmap.compress(CompressFormat.JPEG, 90, outputStream);

I hope this will help you.

我希望这能帮到您。