如何保存在Android上的JPEG图像与自定义质量级别 [英] How to save a JPEG image on Android with a custom quality level

问题描述

在Android上，我该如何保存图像文件为JPEG时30％的质量？

On Android, how do I save an image file as a JPEG at 30% quality?

在标准的Java，我会用的ImageIO 读取图像作为的BufferedImage ，然后保存为一个使用 IIOImage的例如JPEG文件：<一href="http://www.universalwebservices.net/web-programming-resources/java/adjust-jpeg-image-com$p$pssion-quality-when-saving-images-in-java">http://www.universalwebservices.net/web-programming-resources/java/adjust-jpeg-image-com$p$pssion-quality-when-saving-images-in-java.它的出现，然而，Android的缺乏的javax.imageio 包。

In standard Java, I would use ImageIO to read the image as a BufferedImage, then save it as a JPEG file using an IIOImage instance: http://www.universalwebservices.net/web-programming-resources/java/adjust-jpeg-image-compression-quality-when-saving-images-in-java. It appears, however, that Android lacks the javax.imageio package.

推荐答案

您可以通过调用COM preSS并设置第二个参数存储为JPEG格式的位图：

You can store your bitmap in the JPEG format by calling compress and setting the second parameter:

    Bitmap bm2 = createBitmap();
    OutputStream stream = new FileOutputStream("/sdcard/test.jpg");
    /* Write bitmap to file using JPEG and 80% quality hint for JPEG. */
    bm2.compress(CompressFormat.JPEG, 80, stream);

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