SyncAdapterの実装メモ ref: http://qiita.com/nein37/items/cf664d0078a6276cf3d6

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.nein37.syncadaptersample" >

    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.USE_CREDENTIALS" />
    <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name">
        <activity
            android:name=".MyActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <provider
            android:exported="false"
            android:syncable="true"
            android:authorities="com.example.nein37.syncadaptersample"
            android:name=".MyContentProvider" />

        <service
            android:name=".MySyncService"
            android:exported="true"
            android:process=":sync">
            <intent-filter>
                <action android:name="android.content.SyncAdapter" />
            </intent-filter>
            <meta-data
                android:name="android.content.SyncAdapter"
                android:resource="@xml/syncadapter" />
        </service>

    </application>

</manifest>

file6.java

    @Override
    public void onClick(View v) {
        Account account = AccountManager.get(this).getAccountsByType("com.google")[0];
        ContentResolver.requestSync(account,SampleColumn.AUTHORITY,new Bundle());        
    }

MyActivity.java

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);
        // 今回は最初に登録されたGoogleアカウントが対象
        Account account = AccountManager.get(this).getAccountsByType("com.google")[0];

        // ネットワークメッセージタイミングで同期
        ContentResolver.setSyncAutomatically(account, AUTHORITY, true);
    }

MySyncAdapter.java

public class MySyncAdapter extends AbstractThreadedSyncAdapter {

    ContentResolver mContentResolver;

    public MySyncAdapter(Context context, boolean autoInitialize) {
        super(context, autoInitialize);
        mContentResolver = context.getContentResolver();
    }

    @Override
    public void onPerformSync(Account account, Bundle extras, String authority,
                              ContentProviderClient provider, SyncResult syncResult) {
        try {
            AccountManager manager =AccountManager.get(getContext());
            // トークンの取得
            String token = manager.blockingGetAuthToken(account, "cl", true);

            // TODO ここで通信処理を行う

            // TODO DBへの反映処理を行う
            ContentValues values = new ContentValues();
            values.put(COLUMN, VALUE);
            getContext().getContentResolver().insert(CONTENT_URI, values);

        } catch (OperationCanceledException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (AuthenticatorException e) {
            e.printStackTrace();
        }
    }
}

MySyncService.java

public class MySyncService extends Service {

    private MySyncAdapter mSyncAdapter;

    @Override
    public void onCreate() {
        super.onCreate();
        mSyncAdapter =new MySyncAdapter(this,true);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mSyncAdapter.getSyncAdapterBinder();
    }
}

syncadapter.xml

<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
    android:accountType="com.google"
    android:allowParallelSyncs="false"
    android:contentAuthority="com.example.nein37.syncadaptersample"
    android:isAlwaysSyncable="true"
    android:supportsUploading="false"
    android:userVisible="true" />