图片URI到文件 [英] Image Uri to File

问题描述

我有一个开放的形象，使用下面的检索：

I've got an Image Uri, retrieved using the following:

public Uri getImageUri(Context inContext, Bitmap inImage) {
  ByteArrayOutputStream bytes = new ByteArrayOutputStream();
  inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
  String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
  return Uri.parse(path);
}

这工作得惊人用于需要一个图像URI等意图（所以我确切地知道URI是有效的）。

This works just amazing for Intents that require an Image URI, etc (so I know for sure the URI is valid).

但现在我想这个图像URI保存到SD卡中的文件。这是比较困难的，因为URI并没有真正在对SD卡或应用程序的文件点。

But now I want to save this Image URI to a file on the SDCARD. This is more difficult because the URI does not really point at a file on the SDCARD or the app.

我必须首先创建从URI的位图，然后保存位图上的SD卡或者是有一个更快的方式（preferable一个不需要转换为位图在前）。

Will I have to create a bitmap from the URI first, and then save the Bitmap on the SDCARD or is there a quicker way (preferable one that does not require the conversion to a bitmap first).

（我有一个看看这个答案，但它返回未找到文件 - <一个href=\"http://stackoverflow.com/a/13133974/1683141\">http://stackoverflow.com/a/13133974/1683141)

(I've had a look at this answer, but it returns file not found - http://stackoverflow.com/a/13133974/1683141)

推荐答案

的问题是，你被给出的乌里Images.Media.insertImage（） ISN T图像文件，本身。这是在库数据库条目。所以，你需要做的就是从开放的，并使用这个答案 HTTP读取数据的内容： //stackoverflow.com/a/8664605/772095

The problem is that the Uri you've been given by Images.Media.insertImage() isn't to an image file, per se. It is to a database entry in the Gallery. So what you need to do is read the data from that Uri and write it out to a new file in the external storage using this answer http://stackoverflow.com/a/8664605/772095

这不需要创建位图，只需复制链接到URI到一个新文件中的数据。

This doesn't require creating a Bitmap, just duplicating the data linked to the Uri into a new file.

您可以用code像得到使用InputStream中的数据：

You can get the data using an InputStream using code like:

中的InputStream = getContentResolver（）openInputStream（imgUri）;

这是完全未经测试code，但你应该能够做这样的事：

This is completely untested code, but you should be able to do something like this:

Uri imgUri = getImageUri(this, bitmap);  // I'll assume this is a Context and bitmap is a Bitmap

final int chunkSize = 1024;  // We'll read in one kB at a time
byte[] imageData = new byte[chunkSize];

try {
    InputStream in = getContentResolver().openInputStream(imgUri);
    OutputStream out = new FileOutputStream(file);  // I'm assuming you already have the File object for where you're writing to

    int bytesRead;
    while ((bytesRead = in.read(imageData)) > 0) {
        out.write(Arrays.copyOfRange(imageData, 0, Math.max(0, bytesRead)));
    }

} catch (Exception ex) {
    Log.e("Something went wrong.", ex);
} finally {
    in.close();
    out.close();
}

这篇关于图片URI到文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！