使用Google Drive Android API从Google云端硬盘下载图片？ [英] Downloading Images from Google Drive using Google Drive Android API?

问题描述

基本上，我一直在使用本指南： https://developers.google.com/drive / android / intro

Basically, I have been using this guide: https://developers.google.com/drive/android/intro

我已经把照片上传到驱动器的帮助下： https://github.com/googledrive/android-demos/tree/master/ src / com / google / android / gms / drive / sample / demo

I have gotten the picture to upload into drive with the help of: https://github.com/googledrive/android-demos/tree/master/src/com/google/android/gms/drive/sample/demo

但是，上面链接的GitHub项目没有提供任何方法来检索驱动器，它只显示文本文件。我知道QueryNonTextFilesActivity.java，但是这会给MetaDataBuffer中的结果添加到ResultsAdapter中。我的问题是：如何使用这些数据并转换为图像（.png）？

However, the GitHub project linked above does not provide any way to retrieve Images from Drive, it only shows text files. I am aware of the QueryNonTextFilesActivity.java but this gives the result in MetaDataBuffer which is appended onto ResultsAdapter. My question is: how do I use this data and convert to images (.png)?

谢谢

推荐答案

假设你有一个 DriveId ，然后您可以使用 Drive.DriveApi.getFile（） - 这将返回一个 DriveFile 。

Assuming you have a DriveId from when you inserted the image, you can then retrieve the file using Drive.DriveApi.getFile() - this returns you a DriveFile.

一旦你有一个 DriveFile ，你可以得到一个 InputStream 作为Bitmap使用 open（）和代码如

Once you have a DriveFile, you can get an InputStream to the contents of the file as a Bitmap using open() and code such as

file.open(mGoogleApiClient, DriveFile.MODE_READ_ONLY, null)
    .setResultCallback(
      new ResultCallback<DriveApi.DriveContentsResult>() {
        @Override
        public void onResult(DriveApi.DriveContentsResult result) {
        if (!result.getStatus().isSuccess()) {
          // Handle an error
        }
        DriveContents driveContents = result.getDriveContents();
        InputStream is = driveContents.getInputStream();
        Bitmap bitmap = BitmapFactory.decodeStream(is);
        // Do something with the bitmap

        // Don't forget to close the InputStream
        is.close();
      });

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