I am creating an Android App that is providing a button to the user to refresh the database so that the local data and the data on the server remains in sync.
I have created the Account Authenticator, Content Provider and have bind them through a service. The ContentResolver.requestSync() isnt triggering onPerformSync().
Here is what I have got for the code:
public void refreshButton(View view) {
Log.v("aye", "reached here");
Bundle settings = new Bundle();
settings.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL,true);
settings.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true);
Account dummyAccount = createDummyAccount(this);
ContentResolver.requestSync(dummyAccount,MyContract.AUTHORITY,settings);
}
private Account createDummyAccount(Context context) {
Account dummyAccount = new Account("dummyaccount","com.example.sid.fetchdata");
AccountManager accountManager = (AccountManager) context.getSystemService(ACCOUNT_SERVICE);
try {
accountManager.addAccountExplicitly(dummyAccount, null, null);
} catch (Exception e) {
e.printStackTrace();
}
ContentResolver.setSyncAutomatically(dummyAccount, MyContract.AUTHORITY, true);
ContentResolver.setIsSyncable(dummyAccount,MyContract.AUTHORITY,1);
return dummyAccount;
}
I am using a dummy account and have created a stub account authenticator according to the Android Developers Guide.
Here's how my SyncAdapter class looks like:
public class MySyncAdapter extends AbstractThreadedSyncAdapter {
private ContentResolver contentResolver;
public MySyncAdapter(Context context,boolean autoInitialize) {
super(context,autoInitialize);
contentResolver = context.getContentResolver();
}
public MySyncAdapter(Context context,boolean autoInitialize,boolean allowParallelSyncs) {
super(context,autoInitialize,allowParallelSyncs);
contentResolver = context.getContentResolver();
}
@Override
public void onPerformSync(Account account,Bundle extras,String authority,ContentProviderClient providerClient,SyncResult syncResult) {
// android.os.Debug.waitForDebugger();
// Log.e("first","Sync Started");
GetData getData = new GetData(getContext());
ContentValues[] questionsContentValues = getData.getAndParseDataContentValues();
try {
Log.d("inside","Inside");
int deletedRows = providerClient.delete(MyContract.CONTENT_URI, null, null);
// int addedRows = contentResolver.bulkInsert(MyContract.CONTENT_URI,questionsContentValues);
// providerClient.insert(MyContract.CONTENT_URI,questionsContentValues[0]);
// Log.v("third1","" + addedRows);
contentResolver.notifyChange(MyContract.CONTENT_URI,null);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Here's how my AndroidManfiest.xml is structured:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sid.fetchdata">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_SYNC_STATS" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<service
android:name=".RetrieveService"
android:exported="false" />
<activity
android:name=".FetchActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ListActivity"
android:label="@string/title_activity_list"
android:parentActivityName=".FetchActivity"
android:theme="@style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.sid.fetchdata.FetchActivity" />
</activity>
<activity
android:name=".SwipeActivity"
android:label="@string/title_activity_swipe"
android:parentActivityName=".ListActivity"
android:theme="@style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.sid.fetchdata.ListActivity" />
</activity>
<provider
android:name=".MyContentProvider"
android:syncable="true"
android:exported="true"
android:authorities="com.example.sid.fetchdata.provider" />
<service
android:name=".MyService"
android:enabled="true"
android:exported="true" >
<intent-filter>
<action android:name="android.accounts.AccountAuthenticator"/>
</intent-filter>
<meta-data
android:name="android.accounts.AccountAuthenticator"
android:resource="@xml/account_authenticator" />
</service>
<service
android:name=".SyncService"
android:process=":sync"
android:exported="true">
<intent-filter>
<action android:name="android.content.SyncAdapter"/>
</intent-filter>
<meta-data
android:name="android.content.SyncAdapter"
android:resource="@xml/my_sync_adapter" />
</service>
</application>
The corresponding classes are, MyService is bound to the MyStubAuthenticator and SyncService is bound to SyncAdapter.
The xml files for MyStubAuthenticaor:
<?xml version="1.0" encoding="utf-8"?>
<account-authenticator
xmlns:android="http://schemas.android.com/apk/res/android"
android:icon="@mipmap/ic_launcher"
android:smallIcon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:accountType="com.example.sid.fetchdata" />
The xml file for SyncAdapter is:
<?xml version="1.0" encoding="utf-8"?>
<sync-adapter
xmlns:android="http://schemas.android.com/apk/res/android"
android:isAlwaysSyncable="true"
android:allowParallelSyncs="false"
android:supportsUploading="false"
android:userVisible="true"
android:accountType="com.example.sid.fetchdata"
android:contentAuthority="com.example.sid.fetchdata.provider" />
The contract class for the Provider is as follows:
public class MyContract {
public static final String AUTHORITY = "com.example.sid.fetchdata.provider";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + QuestionDataBaseHelper.TABLE_QUESTIONS);
public static final int QUESTIONS = 1;
public static final int QUESTIONS_ID = 2;
public static final String SINGLE_RECORD_MIME_TYPE = "vnd.android.cursor.item/vnd.com.example.sid.fetchdata.provider.questions";
public static final String MULTIPLE_RECORDS_MIME_TYPE = "vnd.android.cursor.dir/vnd.com.example.sid.fetchdata.provider.questions";
}
I have checked that the ContentProvider is working by using it on a separate thread. The account is showing up in the Accounts section in the Settings option of the phone. The Syncing is stuck at Syncing Now...
Finally fixed the problem. The problem was with the onPerformSync() function. The function was being triggered by requestSync() but
contentResolver.notifyChange(MyContract.CONTENT_URI,null);
was the problem. The function as given in the Docs tells that the last argument syncToNetwork determines if the changes are synced to the network. Since I wasn't passing it false, an infinite loop was triggered and hence the sync was taking infinite time to complete.
So the correct call would be,
contentResolver.notifyChange(MyContract.CONTENT_URI,null,false);