Java tutorial
/* * This file is part of GPSLogger for Android. * * GPSLogger for Android is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * GPSLogger for Android is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GPSLogger for Android. If not, see <http://www.gnu.org/licenses/>. */ package com.mendhak.gpslogger.senders.gdocs; import android.content.Context; import android.content.SharedPreferences; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.preference.PreferenceManager; import com.google.android.gms.auth.GoogleAuthUtil; import com.mendhak.gpslogger.common.IActionListener; import com.mendhak.gpslogger.common.Utilities; import com.mendhak.gpslogger.senders.IFileSender; import org.json.JSONObject; import java.io.*; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.List; public class GDocsHelper implements IActionListener, IFileSender { Context ctx; IActionListener callback; /* To revoke permissions: (new Android) ./adb -e shell 'sqlite3 /data/system/users/0/accounts.db "delete from grants;"' or (old Android) ./adb -e shell 'sqlite3 /data/system/accounts.db "delete from grants;"' */ public GDocsHelper(Context applicationContext, IActionListener callback) { this.ctx = applicationContext; this.callback = callback; } public static String GetOauth2Scope() { return "oauth2:https://www.googleapis.com/auth/drive.file"; } /** * Gets the stored authToken, which may be expired */ public static String GetAuthToken(Context applicationContext) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext); return prefs.getString("GDRIVE_AUTH_TOKEN", ""); } /** * Gets the stored account name */ public static String GetAccountName(Context applicationContext) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext); return prefs.getString("GDRIVE_ACCOUNT_NAME", ""); } public static void SetAccountName(Context applicationContext, String accountName) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext); SharedPreferences.Editor editor = prefs.edit(); editor.putString("GDRIVE_ACCOUNT_NAME", accountName); editor.commit(); } /** * Saves the authToken and account name into shared preferences */ public static void SaveAuthToken(Context applicationContext, String authToken) { try { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext); SharedPreferences.Editor editor = prefs.edit(); Utilities.LogDebug("Saving GDocs authToken: " + authToken); editor.putString("GDRIVE_AUTH_TOKEN", authToken); editor.commit(); } catch (Exception e) { Utilities.LogError("GDocsHelper.SaveAuthToken", e); } } /** * Removes the authToken and account name from storage */ public static void ClearAuthToken(Context applicationContext) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext); SharedPreferences.Editor editor = prefs.edit(); editor.remove("GDRIVE_AUTH_TOKEN"); editor.remove("GDRIVE_ACCOUNT_NAME"); editor.commit(); } /** * Returns whether the app is authorized to perform Google API operations * * @param applicationContext * @return */ public static boolean IsLinked(Context applicationContext) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext); String gdocsAuthToken = prefs.getString("GDRIVE_AUTH_TOKEN", ""); String gdocsAccount = prefs.getString("GDRIVE_ACCOUNT_NAME", ""); return gdocsAuthToken.length() > 0 && gdocsAccount.length() > 0; } @Override public void UploadFile(List<File> files) { File zipFile = null; for (File f : files) { if (f.getName().contains(".zip")) { zipFile = f; break; } } if (zipFile != null) { UploadFile(zipFile.getName()); } else { for (File f : files) { UploadFile(f.getName()); } } } public void UploadFile(final String fileName) { if (!IsLinked(ctx)) { callback.OnFailure(); return; } try { File gpsDir = new File(Environment.getExternalStorageDirectory(), "GPSLogger"); File gpxFile = new File(gpsDir, fileName); FileInputStream fis = new FileInputStream(gpxFile); Thread t = new Thread(new GDocsUploadHandler(fis, fileName, GDocsHelper.this)); t.start(); } catch (Exception e) { callback.OnFailure(); Utilities.LogError("GDocsHelper.UploadFile", e); } } private class GDocsUploadHandler implements Runnable { String fileName; InputStream inputStream; IActionListener callback; GDocsUploadHandler(InputStream inputStream, String fileName, IActionListener callback) { this.inputStream = inputStream; this.fileName = fileName; this.callback = callback; } @Override public void run() { try { String token = GoogleAuthUtil.getTokenWithNotification(ctx, GetAccountName(ctx), GetOauth2Scope(), new Bundle()); GDocsHelper.SaveAuthToken(ctx, token); Utilities.LogDebug(token); String gpsLoggerFolderId = GetFileIdFromFileName(token, "GPSLogger For Android"); if (Utilities.IsNullOrEmpty(gpsLoggerFolderId)) { //Couldn't find folder, must create it gpsLoggerFolderId = CreateEmptyFile(token, "GPSLogger For Android", "application/vnd.google-apps.folder", "root"); if (Utilities.IsNullOrEmpty(gpsLoggerFolderId)) { callback.OnFailure(); return; } } //Now search for the file String gpxFileId = GetFileIdFromFileName(token, fileName); if (Utilities.IsNullOrEmpty(gpxFileId)) { //Create empty file first gpxFileId = CreateEmptyFile(token, fileName, "application/xml", gpsLoggerFolderId); if (Utilities.IsNullOrEmpty(gpxFileId)) { callback.OnFailure(); return; } } if (!Utilities.IsNullOrEmpty(gpxFileId)) { //Set file's contents UpdateFileContents(token, gpxFileId, Utilities.GetByteArrayFromInputStream(inputStream)); } callback.OnComplete(); } catch (Exception e) { Utilities.LogError("GDocsUploadHandler", e); callback.OnFailure(); } } } private String UpdateFileContents(String authToken, String gpxFileId, byte[] fileContents) { HttpURLConnection conn = null; String fileId = null; String fileUpdateUrl = "https://www.googleapis.com/upload/drive/v2/files/" + gpxFileId + "?uploadType=media"; try { if (Integer.parseInt(Build.VERSION.SDK) < Build.VERSION_CODES.FROYO) { //Due to a pre-froyo bug //http://android-developers.blogspot.com/2011/09/androids-http-clients.html System.setProperty("http.keepAlive", "false"); } URL url = new URL(fileUpdateUrl); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("PUT"); conn.setRequestProperty("User-Agent", "GPSLogger for Android"); conn.setRequestProperty("Authorization", "Bearer " + authToken); conn.setRequestProperty("Content-Type", "application/xml"); conn.setRequestProperty("Content-Length", String.valueOf(fileContents.length)); conn.setUseCaches(false); conn.setDoInput(true); conn.setDoOutput(true); DataOutputStream wr = new DataOutputStream(conn.getOutputStream()); wr.write(fileContents); wr.flush(); wr.close(); String fileMetadata = Utilities.GetStringFromInputStream(conn.getInputStream()); JSONObject fileMetadataJson = new JSONObject(fileMetadata); fileId = fileMetadataJson.getString("id"); Utilities.LogDebug("File updated : " + fileId); } catch (Exception e) { System.out.println(e.getMessage()); } finally { if (conn != null) { conn.disconnect(); } } return fileId; } private String CreateEmptyFile(String authToken, String fileName, String mimeType, String parentFolderId) { String fileId = null; HttpURLConnection conn = null; String createFileUrl = "https://www.googleapis.com/drive/v2/files"; String createFilePayload = " {\n" + " \"title\": \"" + fileName + "\",\n" + " \"mimeType\": \"" + mimeType + "\",\n" + " \"parents\": [\n" + " {\n" + " \"id\": \"" + parentFolderId + "\"\n" + " }\n" + " ]\n" + " }"; try { if (Integer.parseInt(Build.VERSION.SDK) < Build.VERSION_CODES.FROYO) { //Due to a pre-froyo bug //http://android-developers.blogspot.com/2011/09/androids-http-clients.html System.setProperty("http.keepAlive", "false"); } URL url = new URL(createFileUrl); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("User-Agent", "GPSLogger for Android"); conn.setRequestProperty("Authorization", "Bearer " + authToken); conn.setRequestProperty("Content-Type", "application/json"); conn.setUseCaches(false); conn.setDoInput(true); conn.setDoOutput(true); DataOutputStream wr = new DataOutputStream(conn.getOutputStream()); wr.writeBytes(createFilePayload); wr.flush(); wr.close(); fileId = null; String fileMetadata = Utilities.GetStringFromInputStream(conn.getInputStream()); JSONObject fileMetadataJson = new JSONObject(fileMetadata); fileId = fileMetadataJson.getString("id"); Utilities.LogDebug("File created with ID " + fileId); } catch (Exception e) { System.out.println(e.getMessage()); System.out.println(e.getMessage()); } finally { if (conn != null) { conn.disconnect(); } } return fileId; } private String GetFileIdFromFileName(String authToken, String fileName) { HttpURLConnection conn = null; String fileId = ""; try { fileName = URLEncoder.encode(fileName, "UTF-8"); String searchUrl = "https://www.googleapis.com/drive/v2/files?q=title%20%3D%20%27" + fileName + "%27%20and%20trashed%20%3D%20false"; if (Integer.parseInt(Build.VERSION.SDK) < Build.VERSION_CODES.FROYO) { //Due to a pre-froyo bug //http://android-developers.blogspot.com/2011/09/androids-http-clients.html System.setProperty("http.keepAlive", "false"); } URL url = new URL(searchUrl); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setRequestProperty("User-Agent", "GPSLogger for Android"); conn.setRequestProperty("Authorization", "OAuth " + authToken); String fileMetadata = Utilities.GetStringFromInputStream(conn.getInputStream()); JSONObject fileMetadataJson = new JSONObject(fileMetadata); if (fileMetadataJson.getJSONArray("items") != null && fileMetadataJson.getJSONArray("items").length() > 0) { fileId = fileMetadataJson.getJSONArray("items").getJSONObject(0).get("id").toString(); Utilities.LogDebug("Found file with ID " + fileId); } } catch (Exception e) { Utilities.LogError("SearchForGPSLoggerFile", e); } finally { if (conn != null) { conn.disconnect(); } } return fileId; } @Override public boolean accept(File dir, String name) { return name.toLowerCase().endsWith(".zip") || name.toLowerCase().endsWith(".gpx") || name.toLowerCase().endsWith(".kml"); } @Override public void OnComplete() { callback.OnComplete(); } @Override public void OnFailure() { callback.OnFailure(); } }