如何在Android下载谷歌驱动器文件

问题描述

我想从谷歌驱动器下载文件。
为此，我已经在Google Drive SDk中实现了这个功能，并使用了以下方法。

  @Override 
保护void onActivityResult（int requestCode，int resultCode，Intent data）{
 switch（requestCode）{
 case REQUEST_CODE_OPENER：$ b $ if（resultCode == RESULT_OK）{
 DriveId driveId =（DriveId ）data.getParcelableExtra（
 OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID）; 
 
 
} 
 finish（）; 
 break; 
默认值：
 super.onActivityResult（requestCode，resultCode，data）; 
 
 
 
 
 $ b我也尝试过使用输出流但不能保存数据到一个文件。
 
 
我试过搜索这个，但找不到任何有用的链接，可以指导我如何下载和存储文件。
解决方案
国际海事组织，你应该阅读下面的一些有用的链接：
 
lockquote 
 
  
 
 
 
  
 
 
然后，请参考以下代码片段，当然在获取输入流时，可以将它保存到设备中的文件中，而不是打印到Logcat中。
  public class GoogleDriveActivity扩展了AppCompatActivity 
实现了GoogleApiClient.ConnectionCallbacks， 
 GoogleApiClient.OnConnectionFailedListener {
 ... 
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 ... 
 mProgressBar = （ProgressBar）findViewById（R.id.progressBar）; 
 mProgressBar.setMax（100）; 
 
 
 @Override 
 protected void onResume（）{
 super.onResume（）; 
 if（mGoogleApiClient == null）{
 mGoogleApiClient = new GoogleApiClient.Builder（this）
 .addApi（Drive.API）
 .addScope（Drive.SCOPE_FILE）
 .addConnectionCallbacks（this）
 .addOnConnectionFailedListener（this）
 .build（）; 
} 
 mGoogleApiClient.connect（）; 
 
 $ b @Override 
 protected void onPause（）{
 if（mGoogleApiClient！= null）{
 mGoogleApiClient.disconnect（）; 
} 
 super.onPause（）; 
 
 $ b @Override 
 protected void onActivityResult（final int requestCode，final int resultCode，final Intent data）{
 if（requestCode == RC_OPENER&& resultCode == RESULT_OK）{
 mSelectedFileDriveId = data.getParcelableExtra（
 OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID）; 
 
 
 $ b @Override 
 public void onConnectionFailed（@NonNull ConnectionResult result）{
 //当API客户端无法连接时调用。 
 //做一些事情... 
} 
 
 @Override 
 public void onConnected（@Nullable Bundle bundle）{
 //如果有选定的文件，打开它的内容。 
 if（mSelectedFileDriveId！= null）{
 open（）; 
 return; 
} 
 
 //让用户选择一个文件... 
 IntentSender intentSender = Drive.DriveApi 
 .newOpenFileActivityBuilder（）
 .setMimeType（new String [] {video / mp4，image / jpeg，text / plain}）
 .build（mGoogleApiClient）; 
 try {
 startIntentSenderForResult（intentSender，RC_OPENER，null，0，0，0）; 
} catch（IntentSender.SendIntentException e）{
 Log.e（TAG，Unable to send intent，e）; 
 
 $ 
 $ b @Override 
 public void onConnectionSuspended（int i）{
} 
 
 private void open（） {
 mProgressBar.setProgress（0）; 
 DriveFile.DownloadProgressListener listener = new DriveFile.DownloadProgressListener（）{
 @Override $ b $ public void onProgress（long bytesDownloaded，long bytesExpected）{
 //使用最新进度更新进度对话框。 
 int progress =（int）（bytesDownloaded * 100 / bytesExpected）; 
 Log.d（TAG，String.format（Loading progress：％d percent，progress））; 
 mProgressBar.setProgress（progress）; 
} 
}; 
 DriveFile driveFile = mSelectedFileDriveId.asDriveFile（）; 
 driveFile.open（mGoogleApiClient，DriveFile.MODE_READ_ONLY，listener）
 .setResultCallback（driveContentsCallback）; 
 mSelectedFileDriveId = null; 
} 
 
 private final ResultCallback< DriveApi.DriveContentsResult> driveContentsCallback = 
 new ResultCallback< DriveApi.DriveContentsResult>（）{
 @Override 
 public void onResult（@NonNull DriveApi.DriveContentsResult result）{
 if（！result.getStatus（） .isSuccess（））{
 Log.w（标记，打开文件内容时出错）; 
 return; 
} 
 Log.i（TAG，File contents opened）; 
 
 //从输入流中读取打印到LOGCAT 
 DriveContents driveContents = result.getDriveContents（）; 
 BufferedReader reader = new BufferedReader（new InputStreamReader（driveContents.getInputStream（）））; 
 StringBuilder builder = new StringBuilder（）; 
字符串行; $（b 
 while（（line = reader.readLine（））！= null）{
 builder.append（line）; 
} 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
 String contentsAsString = builder.toString（）; 
 Log.i（TAG，contentsAsString）; 
 
 //关闭文件内容
 driveContents.discard（mGoogleApiClient）; 
} 
}; 
} 
  
希望它有帮助！
 
I wanted to download file from google drive.For this I have implemented in Google Drive SDk and used the following method.
 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case REQUEST_CODE_OPENER:
            if (resultCode == RESULT_OK) {
                DriveId driveId = (DriveId) data.getParcelableExtra(
                        OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID);


            }
            finish();
            break;
        default:
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
I also tried using output stream but not able to save data to a file.
I have tried searching around this, but couldn't find any useful link which can guide me how to download and store file.
 解决方案 
IMO, you should read some useful links below:
Then, please refer to the following snippets, of course when getting the input stream, you can save it to a file in your device instead of printing to Logcat.
public class GoogleDriveActivity extends AppCompatActivity
        implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
        mProgressBar.setMax(100);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (mGoogleApiClient == null) {
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addApi(Drive.API)
                    .addScope(Drive.SCOPE_FILE)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .build();
        }
        mGoogleApiClient.connect();
    }

    @Override
    protected void onPause() {
        if (mGoogleApiClient != null) {
            mGoogleApiClient.disconnect();
        }
        super.onPause();
    }

    @Override
    protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
        if (requestCode == RC_OPENER && resultCode == RESULT_OK) {
            mSelectedFileDriveId = data.getParcelableExtra(
                    OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID);
        }
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult result) {
        // Called whenever the API client fails to connect.
        // Do something...
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        // If there is a selected file, open its contents.
        if (mSelectedFileDriveId != null) {
            open();
            return;
        }

        // Let the user pick a file...
        IntentSender intentSender = Drive.DriveApi
                .newOpenFileActivityBuilder()
                .setMimeType(new String[]{"video/mp4", "image/jpeg", "text/plain"})
                .build(mGoogleApiClient);
        try {
            startIntentSenderForResult(intentSender, RC_OPENER, null, 0, 0, 0);
        } catch (IntentSender.SendIntentException e) {
            Log.e(TAG, "Unable to send intent", e);
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
    }

    private void open() {
        mProgressBar.setProgress(0);
        DriveFile.DownloadProgressListener listener = new DriveFile.DownloadProgressListener() {
            @Override
            public void onProgress(long bytesDownloaded, long bytesExpected) {
                // Update progress dialog with the latest progress.
                int progress = (int) (bytesDownloaded * 100 / bytesExpected);
                Log.d(TAG, String.format("Loading progress: %d percent", progress));
                mProgressBar.setProgress(progress);
            }
        };
        DriveFile driveFile = mSelectedFileDriveId.asDriveFile();
        driveFile.open(mGoogleApiClient, DriveFile.MODE_READ_ONLY, listener)
                .setResultCallback(driveContentsCallback);
        mSelectedFileDriveId = null;
    }

    private final ResultCallback<DriveApi.DriveContentsResult> driveContentsCallback =
            new ResultCallback<DriveApi.DriveContentsResult>() {
                @Override
                public void onResult(@NonNull DriveApi.DriveContentsResult result) {
                    if (!result.getStatus().isSuccess()) {
                        Log.w(TAG, "Error while opening the file contents");
                        return;
                    }
                    Log.i(TAG, "File contents opened");

                    // Read from the input stream an print to LOGCAT
                    DriveContents driveContents = result.getDriveContents();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(driveContents.getInputStream()));
                    StringBuilder builder = new StringBuilder();
                    String line;
                    try {
                        while ((line = reader.readLine()) != null) {
                            builder.append(line);
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    String contentsAsString = builder.toString();
                    Log.i(TAG, contentsAsString);

                    // Close file contents
                    driveContents.discard(mGoogleApiClient);
                }
            };
}
Hope it helps!
                        
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