Android Open Source - TextFileXpanderAndroid Google Drive

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License

The source code is released under:

Apache License

Java Source Code

//
//  GoogleDrive.java
//  TextFileXpander
///*w ww  . j a v  a  2  s . com*/
//  Created by wanswings on 2014/10/05.
//  Copyright (c) 2014 wanswings. All rights reserved.
//
package com.wanswings.TextFileXpander;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpResponse;
import com.google.api.services.drive.Drive.Files;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;

import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import android.widget.Toast;

public class GoogleDrive extends Storage {

  private static final String MIME_FOLDER = "application/vnd.google-apps.folder";
  private static final String MIME_TEXT_PLAIN = "text/plain";

  private String classNameForLog;
  private AuthCommon common;
  private List<File> mFileList;

  public GoogleDrive(Context ct, boolean refresh, StorageListenerInterface listener) {
    super(ct, refresh, listener);

    classNameForLog = this.getClass().getName() + "...";
    common = (AuthCommon)ct.getApplicationContext();
    mFileList = new ArrayList<File>();
    storageListener.readyToStartGoogleAuthActivity();
  }

  @Override
  public boolean onNewIntent(Intent intent) {
    boolean result = true;

    if (!isStorageAvailable()) {
      // offline
      result = false;
    }
    else if (intent != null) {
      boolean fromGoogle = intent.getBooleanExtra(GoogleAuthActivity.EXTRA_FROM_GOOGLE, false);
      Log.i(packageName, classNameForLog + GoogleAuthActivity.EXTRA_FROM_GOOGLE + "..." + fromGoogle);
      if (fromGoogle) {
        result = intent.getBooleanExtra(GoogleAuthActivity.EXTRA_RESULT_GOOGLE, false);
        if (result) {
          selectDir();
        }
      }
    }
    return result;
  }

  @Override
  public boolean isStorageAvailable() {
    boolean result = false;

    ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = cm.getActiveNetworkInfo();
    if (info != null && info.isConnected()) {
      // online
      result = true;
    }
    else {
      Toast.makeText(mContext, R.string.error_internet_not_available, Toast.LENGTH_LONG).show();
    }

    return result;
  }

  @Override
  public void close() {
    common.mDriveService = null;
    common.mGoogleCredential = null;

    super.close();
  }

  @Override
  protected List<String> getEntriesAPI(boolean isDir, String tPath) {
    List<String> result = new ArrayList<String>();

    String parent = null;
    for (File f : mFileList) {
      if (tPath.endsWith(f.getTitle())) {
        parent = "'" + f.getId() + "'";
        String[] keys = prefs.getKeys(PrivateSharedPrefs.SAVE_KEYS_GOOGLE);
        prefs.storeKeys(PrivateSharedPrefs.SAVE_KEYS_GOOGLE, new String[]{keys[0], parent});
        break;
      }
    }
    if (parent == null) {
      parent = "'" + common.mDriveRootFolderId + "'";
      if (isRefresh) {
        String[] keys = prefs.getKeys(PrivateSharedPrefs.SAVE_KEYS_GOOGLE);
        if (keys != null) {
          parent = keys[1];
        }
      }
    }
    mFileList.clear();

    if (isStorageAvailable() && common.mGoogleCredential != null && common.mDriveService != null) {
      StringBuffer sb = new StringBuffer();
      sb.append(parent);
      sb.append(" in parents and trashed=false and mimeType = '");
      if (isDir) {
        sb.append(MIME_FOLDER);
      }
      else {
        sb.append(MIME_TEXT_PLAIN);
      }
      sb.append("'");

      try {
        Files.List request = common.mDriveService.files().list().setQ(sb.toString());
        do {
          FileList files = request.execute();
          mFileList.addAll(files.getItems());
          request.setPageToken(files.getNextPageToken());
        } while (request.getPageToken() != null && request.getPageToken().length() > 0);

        for (File f : mFileList) {
          if (isDir) {
            result.add(f.getTitle());
          }
          else {
            if (f.getTitle().toLowerCase(Locale.ENGLISH).endsWith(TEXT_FILE_EXTENSION)) {
              result.add(f.getTitle());
            }
          }
        }
      }
      catch (IOException e) {
        Log.e(packageName, classNameForLog + e.toString());
      }
    }
    return result;
  }

  @Override
  protected boolean getFileAPI(String fpath, String fname) {
    boolean result = false;

    File file = null;
    for (File f : mFileList) {
      if (fname.equals(f.getTitle())) {
        file = f;
        break;
      }
    }

    if (isStorageAvailable() && file != null &&
            file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
      InputStream is = null;
      FileOutputStream fos = null;
      try {
        HttpResponse resp = common.mDriveService.getRequestFactory()
                .buildGetRequest(new GenericUrl(file.getDownloadUrl())).execute();
        is = resp.getContent();
        fos = mContext.openFileOutput(fname, Context.MODE_PRIVATE);
        byte[] readBytes = new byte[1024];
        int size = 0;
        while ((size = is.read(readBytes)) > 0) {
          fos.write(readBytes, 0, size);
        }
        result = true;
      }
      catch (IOException e) {
        Log.e(packageName, classNameForLog + e.toString());
      }
      finally {
        try {
          if (fos != null) fos.close();
          if (is != null) is.close();
        }
        catch (IOException e) {
          Log.e(packageName, classNameForLog + e.toString());
        }
      }
    }

    return result;
  }
}

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