如何从 google 驱动器获取图像到 android 应用程序？

Question

我有下载图片的代码

private class DownloadImage extends AsyncTask<String, Void, Bitmap>
    {
        @Override
        protected void onPreExecute()
        {
            super.onPreExecute();
            // Create a progressdialog
            mProgressDialog = new ProgressDialog(ClusteringMinimaTest.this);
            // Set progressdialog title
            mProgressDialog.setTitle("Download Image Tutorial");
            // Set progressdialog message
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            // Show progressdialog
            mProgressDialog.show();
        }

        @Override
        protected Bitmap doInBackground(String... URL) {

            String imageURL = URL[0];

            Bitmap bitmap = null;
            try {
                // Download Image from URL
                InputStream input = new java.net.URL(imageURL).openStream();
                // Decode Bitmap
                bitmap = BitmapFactory.decodeStream(input);
            } catch (Exception e) {
                e.printStackTrace();
            }
            if(bitmap!= null)
            {
                //saveToInternalStorage(bitmap);
            }
            return bitmap;
        }
}

Answer 1

假设您在插入图像时有一个 DriveId，然后您可以使用 Drive.DriveApi.getFile() 检索文件 - 这个 returns 您是一个 DriveFile。

一旦有了 DriveFile，就可以使用 open() 和诸如

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();
      });