Added helper app to work around the issue of lost credentials at boot time affecting ownCloud apps installed from the Google Play Store in Android 4.1.x

oc_jb_workaround/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
+	<classpathentry kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="gen"/>
+	<classpathentry kind="output" path="bin/classes"/>
+</classpath>

oc_jb_workaround/.gitignore

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+# built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Mac .DS_Store files
+.DS_Store

oc_jb_workaround/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>owncloud-android-workaround-accounts</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ApkBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

oc_jb_workaround/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.source=1.6

oc_jb_workaround/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.owncloud.android.workaround.accounts"
+    android:versionCode="0100000"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="16"
+        android:targetSdkVersion="16" />
+
+    <application
+        android:allowBackup="false"
+        android:icon="@drawable/oc_workaround_icon"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <service
+            android:name=".AccountAuthenticatorService"
+            android:exported="false">
+            <intent-filter android:priority="1">
+                <action android:name="android.accounts.AccountAuthenticator" />
+            </intent-filter>
+            <meta-data
+                android:name="android.accounts.AccountAuthenticator"
+                android:resource="@xml/authenticator" />
+        </service>
+    </application>
+
+</manifest>

oc_jb_workaround/README.md

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+ownCloud Jelly Bean Workaround
+==============================
+
+Helper app to work around the problem of lost credentials at reboot time found
+in devices with Android 4.1.x. 
+
+Only needed for ownCloud apps installed from the Google Play Store.
+
+See more information about the bug here: 
+http://code.google.com/p/android/issues/detail?id=34880

oc_jb_workaround/proguard-project.txt

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+# To enable ProGuard in your project, edit project.properties
+# to define the proguard.config property as described in that file.
+#
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in ${sdk.dir}/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the ProGuard
+# include property in project.properties.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

oc_jb_workaround/project.properties

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+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-16

oc_jb_workaround/res/values-v11/styles.xml

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+<resources>
+
+    <!--
+        Base application theme for API 11+. This theme completely replaces
+        AppBaseTheme from res/values/styles.xml on API 11+ devices.
+    -->
+    <style name="AppBaseTheme" parent="android:Theme.Holo.Light">
+        <!-- API 11 theme customizations can go here. -->
+    </style>
+
+</resources>

oc_jb_workaround/res/values-v14/styles.xml

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+<resources>
+
+    <!--
+        Base application theme for API 14+. This theme completely replaces
+        AppBaseTheme from BOTH res/values/styles.xml and
+        res/values-v11/styles.xml on API 14+ devices.
+    -->
+    <style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">
+        <!-- API 14 theme customizations can go here. -->
+    </style>
+
+</resources>

oc_jb_workaround/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="app_name">ownCloud Jelly Bean Workaround for lost credentials</string>
+
+</resources>

oc_jb_workaround/res/values/styles.xml

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+<resources>
+
+    <!--
+        Base application theme, dependent on API level. This theme is replaced
+        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
+    -->
+    <style name="AppBaseTheme" parent="android:Theme.Light">
+        <!--
+            Theme customizations available in newer API levels can go in
+            res/values-vXX/styles.xml, while customizations related to
+            backward-compatibility can go here.
+        -->
+    </style>
+
+    <!-- Application theme. -->
+    <style name="AppTheme" parent="AppBaseTheme">
+        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
+    </style>
+
+</resources>

oc_jb_workaround/res/xml/authenticator.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
+                       android:accountType="owncloud"
+                       android:icon="@drawable/oc_icon"
+                       android:label="@string/app_name"
+                       android:smallIcon="@drawable/oc_icon">  
+</account-authenticator>

oc_jb_workaround/src/com/owncloud/android/workaround/accounts/AccountAuthenticatorService.java

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+/* ownCloud Jelly Bean Workaround for lost credentials
+ *
+ *   Copyright (C) 2013 ownCloud Inc.
+ */
+
+package com.owncloud.android.workaround.accounts;
+
+import android.accounts.AbstractAccountAuthenticator;
+import android.accounts.Account;
+import android.accounts.AccountAuthenticatorResponse;
+import android.accounts.AccountManager;
+import android.accounts.NetworkErrorException;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.IBinder;
+
+public class AccountAuthenticatorService extends Service {
+
+    private AccountAuthenticator mAuthenticator;
+    static final public String ACCOUNT_TYPE = "owncloud";
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        mAuthenticator = new AccountAuthenticator(this);
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return mAuthenticator.getIBinder();
+    }
+    
+    
+    public static class AccountAuthenticator extends AbstractAccountAuthenticator {
+
+    	public AccountAuthenticator(Context context) {
+            super(context);
+        }
+
+        @Override
+        public Bundle addAccount(AccountAuthenticatorResponse response,
+                String accountType, String authTokenType,
+                String[] requiredFeatures, Bundle options)
+                throws NetworkErrorException {
+            return getCommonResultBundle();
+        }
+
+        
+		@Override
+        public Bundle confirmCredentials(AccountAuthenticatorResponse response,
+                Account account, Bundle options) throws NetworkErrorException {
+            return getCommonResultBundle();
+        }
+
+        @Override
+        public Bundle editProperties(AccountAuthenticatorResponse response,
+                String accountType) {
+            return getCommonResultBundle();
+        }
+
+        @Override
+        public Bundle getAuthToken(AccountAuthenticatorResponse response,
+                Account account, String authTokenType, Bundle options)
+                throws NetworkErrorException {
+            return getCommonResultBundle();
+        }
+
+        @Override
+        public String getAuthTokenLabel(String authTokenType) {
+            return "";
+        }
+
+        @Override
+        public Bundle hasFeatures(AccountAuthenticatorResponse response,
+                Account account, String[] features) throws NetworkErrorException {
+            return getCommonResultBundle();
+        }
+
+        @Override
+        public Bundle updateCredentials(AccountAuthenticatorResponse response,
+                Account account, String authTokenType, Bundle options)
+                throws NetworkErrorException {
+            return getCommonResultBundle();
+        }
+
+        @Override
+        public Bundle getAccountRemovalAllowed(
+                AccountAuthenticatorResponse response, Account account)
+                throws NetworkErrorException {
+            return getCommonResultBundle();
+        }
+
+        private Bundle getCommonResultBundle() {
+        	Bundle resultBundle = new Bundle();
+            resultBundle.putInt(AccountManager.KEY_ERROR_CODE, AccountManager.ERROR_CODE_UNSUPPORTED_OPERATION);
+            resultBundle.putString(AccountManager.KEY_ERROR_MESSAGE, "This is just a workaround, not a real account authenticator");
+            return resultBundle;
+		}
+
+    }
+}