BackupAgentHelper崩溃与大量的文件

我有一个应用程序，有大量的用户生成的文件，我需要备份。所有内容都存储在数据库，首选项或4个文件夹中的1个中。我写了一个简单的帮助函数来为每个文件夹中的文件生成所有FileBackupHelpers。但是，似乎在我的onCreate()运行FileBackupHelper的框架代码后，窒碍了解析和崩溃我的应用程序的路径数量。BackupAgentHelper崩溃与大量的文件

下面是代码为我的备份代理：

package <packageNameRemovedToProtectClient>.service; 

import android.app.backup.BackupAgentHelper; 
import android.app.backup.FileBackupHelper; 
import android.app.backup.SharedPreferencesBackupHelper; 
import android.content.Context; 
import android.os.Environment; 
import android.util.Log; 

import <packageNameRemovedToProtectClient>.data.DBManager; 

import java.io.File; 
import java.util.Arrays; 
import java.util.Collections; 
import java.util.Vector; 

/** 
* Created by mclark4386 on 9/18/14. 
*/ 
public class AABackupAgent extends BackupAgentHelper { 
private static final String CLASS_NAME = AABackupAgent.class.getSimpleName(); 

private Context mContext; 

public AABackupAgent() { 
    super(); 
} 

@Override 
public void onCreate() { 
    super.onCreate(); 
    mContext = this; 
    AssetManager.setupSingleton(mContext); 
    Log.v(CLASS_NAME,"GO!"); 
    this.addHelper("prefs", new SharedPreferencesBackupHelper(mContext, Service.PREFS_NAME)); 
    String dbfile = DBManager.filePath.replace(".sqlite", ""); 
    Log.v(CLASS_NAME,"DB file:"+dbfile); 
    File dataDirectory = Environment.getDataDirectory(); 
    File db = new File(dataDirectory,DBManager.fullDBPath); 
    Log.v(CLASS_NAME,"path:"+db.getAbsolutePath()); 
    this.addHelper("db", new FileBackupHelper(mContext, db.getAbsolutePath())); 
    AddFolderHelper(AssetManager.thingImageFolder.getAbsolutePath()); 
    AddFolderHelper(AssetManager.userFolder.getAbsolutePath()); 
    AddFolderHelper(AssetManager.categoryImageFolder.getAbsolutePath()); 
    AddFolderHelper(AssetManager.audioFolder.getAbsolutePath()); 
    Log.v(CLASS_NAME,"onCreate Done!"); 
} 

private void AddFolderHelper(String path){ 
    try{ 
     File folder = new File(path); 
     if (folder.isDirectory()){ 
      Log.v(CLASS_NAME,"Filebackup list size::"+folder.list().length+" for path:"+folder.getName()); 
      File[] listFiles = folder.listFiles(); 
      Vector<String> filepaths = new Vector<String>(listFiles.length); 
      for (int i = 0;i< listFiles.length;i++) 
       filepaths.add(listFiles[i].getAbsolutePath()); 
      if (filepaths.size()>512){ 
       int count = (filepaths.size()/511); 
       if(filepaths.size()%511 > 0)count++; 
       Log.v(CLASS_NAME,"should break up the paths in to "+count+" chunks!"); 
       String[] paths = new String[filepaths.size()]; 
       filepaths.toArray(paths); 
       String shortName = folder.getName(); 
       for (int i = 0; i < count; i++) { 
        Log.v(CLASS_NAME,"adding helper for path:"+shortName+i); 
        String[] pathRange = Arrays.copyOfRange(paths, 511 * i, (511 * i) + 511); 
        this.addHelper(shortName+i, new FileBackupHelper(mContext, pathRange)); 
       } 
      }else { 
       String[] paths = new String[filepaths.size()]; 
       filepaths.toArray(paths); 
       this.addHelper(path, new FileBackupHelper(mContext, paths)); 
      } 
     }else{ 
      this.addHelper(path, new FileBackupHelper(mContext, path)); 
     } 
    }catch (Exception e){ 
     Log.e(CLASS_NAME,"ERROR: AddFolderHelper:"); 
     e.printStackTrace(); 
    } 
} 
}

这里是日志输出：

V/AABackupAgent﹕ GO! 
V/AABackupAgent﹕ DB file:AADataModel 
V/AABackupAgent﹕ path:/data/data/<packageNameRemovedToProtectClient>/databases/AADataModel.sqlite 
V/AABackupAgent﹕ Filebackup list size::551 for path:thingImage 
V/AABackupAgent﹕ should break up the paths in to 2 chunks! 
V/AABackupAgent﹕ adding helper for path:thingImage0 
V/AABackupAgent﹕ adding helper for path:thingImage1 
V/AABackupAgent﹕ Filebackup list size::1 for path:user 
V/AABackupAgent﹕ Filebackup list size::0 for path:categoryImage 
V/AABackupAgent﹕ Filebackup list size::551 for path:audio 
V/AABackupAgent﹕ should break up the paths in to 2 chunks! 
V/AABackupAgent﹕ adding helper for path:audio0 
V/AABackupAgent﹕ adding helper for path:audio1 
V/AABackupAgent﹕ onCreate Done! 
V/BackupServiceBinder﹕ doBackup() invoked 
D/BackupHelperDispatcher﹕ handling existing helper 'db' [email protected] 
D/BackupHelperDispatcher﹕ handling existing helper 'prefs' [email protected] 
D/BackupHelperDispatcher﹕ handling new helper '/storage/emulated/0/Android/data/<packageNameRemovedToProtectClient>/files/categoryImage' 
D/BackupHelperDispatcher﹕ handling new helper '/storage/emulated/0/Android/data/<packageNameRemovedToProtectClient>/files/user' 
D/BackupHelperDispatcher﹕ handling new helper 'audio0' 
E/dalvikvm﹕ JNI ERROR (app bug): local reference table overflow (max=512) 
W/dalvikvm﹕ JNI local reference table (0x7e2ff770) dump: 
W/dalvikvm﹕ Last 10 entries (of 512): 
W/dalvikvm﹕ 511: 0x426c0878 java.lang.String "/data/data/com.m... (132 chars) 
W/dalvikvm﹕ 510: 0x426c0830 java.lang.String "/data/data/com.m... (138 chars) 
W/dalvikvm﹕ 509: 0x426c0500 java.lang.String "/data/data/com.m... (127 chars) 
W/dalvikvm﹕ 508: 0x426c01d8 java.lang.String "/data/data/com.m... (131 chars) 
W/dalvikvm﹕ 507: 0x426ba7d8 java.lang.String "/data/data/com.m... (131 chars) 
W/dalvikvm﹕ 506: 0x426ba790 java.lang.String "/data/data/com.m... (137 chars) 
W/dalvikvm﹕ 505: 0x426bf488 java.lang.String "/data/data/com.m... (135 chars) 
W/dalvikvm﹕ 504: 0x426bf158 java.lang.String "/data/data/com.m... (130 chars) 
W/dalvikvm﹕ 503: 0x426bee38 java.lang.String "/data/data/com.m... (129 chars) 
W/dalvikvm﹕ 502: 0x426b94b0 java.lang.String "/data/data/com.m... (131 chars) 
W/dalvikvm﹕ Summary: 
W/dalvikvm﹕ 1 of java.lang.Class 
W/dalvikvm﹕ 507 of java.lang.String (507 unique instances) 
W/dalvikvm﹕ 2 of java.io.FileDescriptor (2 unique instances) 
W/dalvikvm﹕ 2 of java.lang.String[] (511 elements) (2 unique instances) 
E/dalvikvm﹕ Failed adding to JNI local ref table (has 512 entries) 
I/dalvikvm﹕ "Binder_3" prio=5 tid=20 RUNNABLE 
I/dalvikvm﹕ | group="main" sCount=0 dsCount=0 obj=0x42f4b218 self=0x777b2a98 
I/dalvikvm﹕ | sysTid=10236 nice=0 sched=0/0 cgrp=apps handle=1942542136 
I/dalvikvm﹕ | state=R schedstat=(18035885 5737305 43) utm=1 stm=0 core=3 
I/dalvikvm﹕ at android.app.backup.FileBackupHelperBase.performBackup_native(Native Method) 
I/dalvikvm﹕ at android.app.backup.FileBackupHelperBase.performBackup_checked(FileBackupHelperBase.java:76) 
I/dalvikvm﹕ at android.app.backup.FileBackupHelper.performBackup(FileBackupHelper.java:85) 
I/dalvikvm﹕ at android.app.backup.BackupHelperDispatcher.doOneBackup(BackupHelperDispatcher.java:95) 
I/dalvikvm﹕ at android.app.backup.BackupHelperDispatcher.performBackup(BackupHelperDispatcher.java:76) 
I/dalvikvm﹕ at android.app.backup.BackupAgentHelper.onBackup(BackupAgentHelper.java:66) 
I/dalvikvm﹕ at android.app.backup.BackupAgent$BackupServiceBinder.doBackup(BackupAgent.java:567) 
I/dalvikvm﹕ at android.app.IBackupAgent$Stub.onTransact(IBackupAgent.java:80) 
I/dalvikvm﹕ at android.os.Binder.execTransact(Binder.java:404) 
I/dalvikvm﹕ at dalvik.system.NativeStart.run(Native Method) 
I/dalvikvm﹕ [ 09-20 04:06:45.777 9815:10236 E/dalvikvm ] VM aborting 
A/libc﹕ Fatal signal 6 (SIGABRT) at 0x00002657 (code=-6), thread 10236 (Binder_3) 
W/ContextImpl﹕ Failed to ensure directory: /storage/extSdCard/Android/data/<packageNameRemovedToProtectClient>/files 
W/ContextImpl﹕ Failed to ensure directory: /storage/extSdCard/Android/data/<packageNameRemovedToProtectClient>/files 
V/AABackupAgent﹕ GO! 
V/AABackupAgent﹕ DB file:AADataModel 
V/AABackupAgent﹕ path:/data/data/<packageNameRemovedToProtectClient>/databases/AADataModel.sqlite 
V/AABackupAgent﹕ Filebackup list size::551 for path:thingImage 
V/AABackupAgent﹕ should break up the paths in to 2 chunks! 
V/AABackupAgent﹕ adding helper for path:thingImage0 
V/AABackupAgent﹕ adding helper for path:thingImage1 
V/AABackupAgent﹕ Filebackup list size::1 for path:user 
V/AABackupAgent﹕ Filebackup list size::0 for path:categoryImage 
V/AABackupAgent﹕ Filebackup list size::551 for path:audio 
V/AABackupAgent﹕ should break up the paths in to 2 chunks! 
V/AABackupAgent﹕ adding helper for path:audio0 
V/AABackupAgent﹕ adding helper for path:audio1 
V/AABackupAgent﹕ onCreate Done!

预先感谢任何帮助，您可以给！如果您需要任何其他信息，请让我知道。

来源

2014-09-20 Matthew Clark

不确定BackupAgentHelper的强大程度足以备份和恢复大量数据。此外还存在安全问题，并且在所有设备上似乎都不可用。 – 2014-09-26 02:08:09

这是有点我精神上的标题。如果你可以建议合适的选择，我很可能会接受它^^ – 2014-09-26 05:36:25

数据有多大？你这样做是为了让你的用户能够在Internet上备份和恢复他们的数据吗？ – 2014-09-26 06:20:58

下面是我所做的细节。在开始时，我尝试了与你一样的方式，我实现了BackupAgentHelper，但我很快意识到它不足以备份和恢复文件，我认为对于真正轻量的数据或用户首选项来说，这样做确实没问题。在我的情况下，我需要备份一个SQLite数据库和许多图片相关。

这里基本上是这个过程中我设置：

对于备份：

第一步：一个AsyncTask副本，并收集不同的文件备份在同一文件夹上的外部存储。
第二步：另一个AsyncTask压缩所有文件一起
第三步：再AsyncTask传输压缩到Dropbox的（我想我也可能会与谷歌驱动器以后做）

对于修复：

第一步：一个AsyncTask将Drop从Dropbox传输到设备。
第二步：另一个AsyncTask解压缩所有文件
第三步：另一个AsyncTask将文件移动到应该位置。

这样我确信所有的都是按时完成的，我可以按照所发生的事情做。有了BackupAgentHelper，你无法轻易的跟进和完成任务。

PS：对于Dropbox，我使用了Core API，他们给出了一个很好的项目示例（“DBRoulette”）。

来源

2014-09-27 01:20:24

我正在做这样的事情，但与谷歌驱动器。再次感谢！ – 2014-10-31 06:06:32

BackupAgentHelper崩溃与大量的文件

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