Java tutorial
/* Copyright 2014 John Bailey Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package com.brightsilence.dev.androidphotobackup; import android.app.IntentService; import android.app.NotificationManager; import android.app.PendingIntent; import android.preference.PreferenceManager; import android.support.v4.app.NotificationCompat; import android.support.v4.app.TaskStackBuilder; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.database.Cursor; import android.net.Uri; import android.provider.MediaStore; import android.util.Log; import java.io.FileInputStream; import java.util.HashSet; import java.util.Set; /** Implements an Android Service which actually does the work of backing up the media files based on the setting entered by the user. */ public class PhotoBackupService extends IntentService { public static final String TAG = "PhotoBackup::PhotoBackupService"; public static final int m_notificationId = 111; private DropBoxWrapper mDropBoxWrapper = null; /** Map of all of the directories that have been checked for existence (or created) */ private Set<String> mExistingDirs; private String mTargetDir; private SharedPreferences mSharedPreferences; public PhotoBackupService() { super("PhotoBackupService"); } /** Update the stored time at which a backup was last performed. */ private void updateLastBackupTime() { SharedPreferences.Editor preferenceEditor = mSharedPreferences.edit(); preferenceEditor.putLong("last_backup_time", System.currentTimeMillis()); preferenceEditor.apply(); } /** Handles the backing up of all files pointed to by the supplied database cursor * * @param cursor Cursor to be iterated. */ private void handleFiles(Cursor cursor) { final int displayNameColIdx = cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME); final int bucketDisplayNameColIdx = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_DISPLAY_NAME); final int dateModColIdx = cursor.getColumnIndex(MediaStore.Images.Media.DATE_MODIFIED); do { String bucketName = cursor.getString(bucketDisplayNameColIdx); /* Check to see if the directory has already been checked & if not, attempt to create it. */ if (mExistingDirs.contains(bucketName) || (mDropBoxWrapper.createDir(mTargetDir + "/" + bucketName) && mExistingDirs.add(bucketName))) { String mediaFileName = cursor.getString(displayNameColIdx); String mediaModified = cursor.getString(dateModColIdx); String targetMediaFileName = mediaFileName + "." + mediaModified + ".zip"; String fileSrc = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); String targetPathAndName = mTargetDir + "/" + bucketName + "/" + targetMediaFileName; Log.d(TAG, "File Source: " + fileSrc); handleIndividualFile(fileSrc, targetPathAndName); } else { Log.d(TAG, "Failed to create bucket directory for: " + bucketName); } } while (cursor.moveToNext()); } /** Handles the backing up of a particular file * @param fileSrc The path to the local file on the Android device * @param targetPathAndName The fully qualified destination path */ private void handleIndividualFile(String fileSrc, String targetPathAndName) { if (!mDropBoxWrapper.fileExists(targetPathAndName)) { Log.d(TAG, "File doesn't already exist"); try { ZipInputStream zipStream = new ZipInputStream(new FileInputStream(fileSrc), fileSrc, mSharedPreferences.getString("password_text", ""), mSharedPreferences.getString("zip_encryption_type", "")); mDropBoxWrapper.upload(targetPathAndName, zipStream); } catch (Exception e) { e.printStackTrace(); } } else { Log.d(TAG, "File exists"); } } /** Method to examine media stores on both internal and external storage and backup the files (via the handleFiles method) */ private void backupContent() { ContentResolver contentResolver = getContentResolver(); for (int i = 0; i < 2; i++) { Uri src; if (i == 0) { src = MediaStore.Images.Media.INTERNAL_CONTENT_URI; Log.d(TAG, "Examining internal media storage\n"); } else { src = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; Log.d(TAG, "Examining external media storage\n"); } Cursor cursor = contentResolver.query(src, null, null, null, null); if (cursor.moveToFirst()) { mExistingDirs = new HashSet<String>(); handleFiles(cursor); } Log.d(TAG, "Finished storage examination"); cursor.close(); } } @Override protected void onHandleIntent(Intent intent) { String resultString = ""; mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); Log.d(TAG, "onHandleIntent"); if (mSharedPreferences.getString("password_text", "").length() == 0) { resultString = "No password set"; } else if (mSharedPreferences.getBoolean("enable_dropbox_checkbox", false) && mSharedPreferences.getBoolean("connection_to_dropbox", false)) { resultString = startBackup(); } else { resultString = "Dropbox not enabled"; } doNotification(resultString); updateLastBackupTime(); } private String startBackup() { String resultString = ""; mDropBoxWrapper = new DropBoxWrapper(getApplicationContext()); if (mDropBoxWrapper.isConnected()) { Log.d(TAG, "DropBox connected"); mTargetDir = mSharedPreferences.getString("dropbox_target_dir", ""); Log.d(TAG, "Creating directory " + mTargetDir); if (mDropBoxWrapper.createDir(mTargetDir)) { backupContent(); // TODO: Complete, but maybe with errors resultString = "Backup complete"; } else { Log.d(TAG, "Top-level directory creation failed"); resultString = "Couldn't create container directory"; } } else { Log.d(TAG, "DropBox not connected"); resultString = "Dropbox not connected"; } return resultString; } private void doNotification(String notificationText) { NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this) .setSmallIcon(R.drawable.ic_launcher).setContentTitle("Android Photo Backup Complete") .setContentText(notificationText); // Creates an explicit intent for an Activity in your app Intent resultIntent = new Intent(this, PhotoBackupSettingsActivity.class); // The stack builder object will contain an artificial back stack for the // started Activity. // This ensures that navigating backward from the Activity leads out of // your application to the Home screen. TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); // Adds the back stack for the Intent (but not the Intent itself) stackBuilder.addParentStack(PhotoBackupSettingsActivity.class); // Adds the Intent that starts the Activity to the top of the stack stackBuilder.addNextIntent(resultIntent); PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); mBuilder.setContentIntent(resultPendingIntent); NotificationManager mNotificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE); // mId allows you to update the notification later on. mNotificationManager.notify(m_notificationId, mBuilder.build()); } }