Android
SyncAdapter는 주기적으로 데이터를 동기화합니다.

소개

서버에서 요청할 때마다 최소값으로 어댑터를 동기화하십시오.

<provider
        android:name=".DummyContentProvider"
        android:authorities="sample.map.com.ipsyncadapter"
        android:exported="false" />

    <!-- This service implements our SyncAdapter. It needs to be exported, so that the system
    sync framework can access it. -->
    <service android:name=".SyncService"
        android:exported="true">
        <!-- This intent filter is required. It allows the system to launch our sync service
        as needed. -->
        <intent-filter>
            <action android:name="android.content.SyncAdapter" />
        </intent-filter>
        <!-- This points to a required XML file which describes our SyncAdapter. -->
        <meta-data android:name="android.content.SyncAdapter"
            android:resource="@xml/syncadapter" />
    </service>

    <!-- This implements the account we'll use as an attachment point for our SyncAdapter. Since
    our SyncAdapter doesn't need to authenticate the current user (it just fetches a public RSS
    feed), this account's implementation is largely empty.

    It's also possible to attach a SyncAdapter to an existing account provided by another
    package. In that case, this element could be omitted here. -->
    <service android:name=".AuthenticatorService"
        >
        <!-- Required filter used by the system to launch our account service. -->
        <intent-filter>
            <action android:name="android.accounts.AccountAuthenticator" />
        </intent-filter>
        <!-- This points to an XMLf ile which describes our account service. -->
        <meta-data android:name="android.accounts.AccountAuthenticator"
            android:resource="@xml/authenticator" />
    </service>

이 코드는 매니페스트 파일에 추가해야합니다.

위의 코드에서는 syncservice와 conteprovider 및 authenticatorservice가 있습니다.

응용 프로그램에서 xml 패키지를 만들어 syncadpter 및 authenticator xml 파일을 추가해야합니다. authenticator.xml

<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
    android:accountType="@string/R.String.accountType"
    android:icon="@mipmap/ic_launcher"
    android:smallIcon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    />

syncadapter

<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
    android:contentAuthority="@string/R.String.contentAuthority"
    android:accountType="@string/R.String.accountType"
    android:userVisible="true"
    android:allowParallelSyncs="true"
    android:isAlwaysSyncable="true"
    android:supportsUploading="false"/>

인증 기

import android.accounts.AbstractAccountAuthenticator;
import android.accounts.Account;
import android.accounts.AccountAuthenticatorResponse;
import android.accounts.NetworkErrorException;
import android.content.Context;
import android.os.Bundle;

public class Authenticator extends AbstractAccountAuthenticator {
    private Context mContext;
    public Authenticator(Context context) {
        super(context);
         this.mContext=context;
    }

    @Override
    public Bundle editProperties(AccountAuthenticatorResponse accountAuthenticatorResponse, String s) {
        return null;
    }

    @Override
    public Bundle addAccount(AccountAuthenticatorResponse accountAuthenticatorResponse, String s, String s1, String[] strings, Bundle bundle) throws NetworkErrorException {
        return null;
    }

    @Override
    public Bundle confirmCredentials(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, Bundle bundle) throws NetworkErrorException {
        return null;
    }

    @Override
    public Bundle getAuthToken(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, String s, Bundle bundle) throws NetworkErrorException {
        return null;
    }

    @Override
    public String getAuthTokenLabel(String s) {
        return null;
    }

    @Override
    public Bundle updateCredentials(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, String s, Bundle bundle) throws NetworkErrorException {
        return null;
    }

    @Override
    public Bundle hasFeatures(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, String[] strings) throws NetworkErrorException {
        return null;
    }
}

AuthenticatorService

public class AuthenticatorService extends Service {

    private Authenticator authenticator;

    public AuthenticatorService() {
        super();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        IBinder ret = null;
        if (intent.getAction().equals(AccountManager.ACTION_AUTHENTICATOR_INTENT)) ;
        ret = getAuthenticator().getIBinder();
        return ret;
    }

    public Authenticator getAuthenticator() {
        if (authenticator == null)
            authenticator = new Authenticator(this);
        return authenticator;
    }
}

IpDataDBHelper

 public class IpDataDBHelper extends SQLiteOpenHelper {
    private static final int DATABASE_VERSION=1;
    private static final String DATABASE_NAME="ip.db";
    public static final String TABLE_IP_DATA="ip";

    public static final String COLUMN_ID="_id";
    public static final String COLUMN_IP="ip";
    public static final String COLUMN_COUNTRY_CODE="country_code";
    public static final String COLUMN_COUNTRY_NAME="country_name";
    public static final String COLUMN_CITY="city";
    public static final String COLUMN_LATITUDE="latitude";
    public static final String COLUMN_LONGITUDE="longitude";

    public IpDataDBHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, DATABASE_NAME, factory, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        String CREATE_TABLE="CREATE TABLE " + TABLE_IP_DATA + "( " + COLUMN_ID + " INTEGER PRIMARY KEY ,"
                + COLUMN_IP + " INTEGER ," + COLUMN_COUNTRY_CODE + " INTEGER ," + COLUMN_COUNTRY_NAME +
                " TEXT ," + COLUMN_CITY + " TEXT ," + COLUMN_LATITUDE + " INTEGER ," + COLUMN_LONGITUDE + " INTEGER)";
        sqLiteDatabase.execSQL(CREATE_TABLE);
        Log.d("SQL",CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
        sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_IP_DATA);
        onCreate(sqLiteDatabase);
    }

    public long AddIPData(ContentValues values)
    {
        SQLiteDatabase sqLiteDatabase =getWritableDatabase();
        long insertedRow=sqLiteDatabase.insert(TABLE_IP_DATA,null,values);
        return insertedRow;
    }

    public Cursor getAllIpData()
    {
        String[] projection={COLUMN_ID,COLUMN_IP,COLUMN_COUNTRY_CODE,COLUMN_COUNTRY_NAME,COLUMN_CITY,COLUMN_LATITUDE,COLUMN_LONGITUDE};
        SQLiteDatabase sqLiteDatabase =getReadableDatabase();
        Cursor cursor = sqLiteDatabase.query(TABLE_IP_DATA,projection,null,null,null,null,null);
        return cursor;
    }

    public int deleteAllIpData()
    {
        SQLiteDatabase sqLiteDatabase=getWritableDatabase();
        int rowDeleted=sqLiteDatabase.delete(TABLE_IP_DATA,null,null);
        return rowDeleted;
    }
}

주요 활동

     public class MainActivity extends AppCompatActivity {
    
        private static final String ACCOUNT_TYPE="sample.map.com.ipsyncadapter";
        private static final String AUTHORITY="sample.map.com.ipsyncadapter";
        private static final String ACCOUNT_NAME="Sync";
    
        public TextView mIp,mCountryCod,mCountryName,mCity,mLatitude,mLongitude;
        CursorAdapter cursorAdapter;
        Account mAccount;
        private String TAG=this.getClass().getCanonicalName();
        ListView mListView;
        public SharedPreferences mSharedPreferences;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            mListView = (ListView) findViewById(R.id.list);
            mIp=(TextView)findViewById(R.id.txt_ip);
            mCountryCod=(TextView)findViewById(R.id.txt_country_code);
            mCountryName=(TextView)findViewById(R.id.txt_country_name);
            mCity=(TextView)findViewById(R.id.txt_city);
            mLatitude=(TextView)findViewById(R.id.txt_latitude);
            mLongitude=(TextView)findViewById(R.id.txt_longitude);
            mSharedPreferences=getSharedPreferences("MyIp",0);
            
//Using shared preference iam displaying values in text view. 
            String txtIp=mSharedPreferences.getString("ipAdr","");
            String txtCC=mSharedPreferences.getString("CCode","");
            String txtCN=mSharedPreferences.getString("CName","");
            String txtC=mSharedPreferences.getString("City","");
            String txtLP=mSharedPreferences.getString("Latitude","");
            String txtLN=mSharedPreferences.getString("Longitude","");
    
            mIp.setText(txtIp);
            mCountryCod.setText(txtCC);
            mCountryName.setText(txtCN);
            mCity.setText(txtC);
            mLatitude.setText(txtLP);
            mLongitude.setText(txtLN);
    
            mAccount=createSyncAccount(this);
//In this code i am using content provider to save data.
           /* Cursor cursor=getContentResolver().query(MyIPContentProvider.CONTENT_URI,null,null,null,null);
            cursorAdapter=new SimpleCursorAdapter(this,R.layout.list_item,cursor,new String []{"ip","country_code","country_name","city","latitude","longitude"},
                                                                new int[] {R.id.txt_ip,R.id.txt_country_code,R.id.txt_country_name,R.id.txt_city,R.id.txt_latitude,R.id.txt_longitude},0);
    
            mListView.setAdapter(cursorAdapter);
            getContentResolver().registerContentObserver(MyIPContentProvider.CONTENT_URI,true,new StockContentObserver(new Handler()));
    */
            Bundle settingBundle=new Bundle();
            settingBundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL,true);
            settingBundle.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED,true);
            ContentResolver.requestSync(mAccount,AUTHORITY,settingBundle);
            ContentResolver.setSyncAutomatically(mAccount,AUTHORITY,true);
            ContentResolver.addPeriodicSync(mAccount,AUTHORITY,Bundle.EMPTY,60);
        }
    
        private Account createSyncAccount(MainActivity mainActivity) {
            Account account=new Account(ACCOUNT_NAME,ACCOUNT_TYPE);
            AccountManager accountManager=(AccountManager)mainActivity.getSystemService(ACCOUNT_SERVICE);
            if(accountManager.addAccountExplicitly(account,null,null))
            {
    
            }else
            {
    
            }
            return account;
        }
    
    
        private class StockContentObserver extends ContentObserver {
            @Override
            public void onChange(boolean selfChange, Uri uri) {
                Log.d(TAG, "CHANGE OBSERVED AT URI: " + uri);
                cursorAdapter.swapCursor(getContentResolver().query(MyIPContentProvider.CONTENT_URI, null, null, null, null));
            }
    
            public StockContentObserver(Handler handler) {
                super(handler);
    
            }
        }
        @Override
        protected void onResume() {
            super.onResume();
            registerReceiver(syncStaredReceiver, new IntentFilter(SyncAdapter.SYNC_STARTED));
            registerReceiver(syncFinishedReceiver, new IntentFilter(SyncAdapter.SYNC_FINISHED));
        }
    
        @Override
        protected void onPause() {
            super.onPause();
            unregisterReceiver(syncStaredReceiver);
            unregisterReceiver(syncFinishedReceiver);
        }
        private BroadcastReceiver syncFinishedReceiver = new BroadcastReceiver() {
    
            @Override
            public void onReceive(Context context, Intent intent) {
                Log.d(TAG, "Sync finished!");
                Toast.makeText(getApplicationContext(), "Sync Finished", Toast.LENGTH_SHORT).show();
            }
        };
        private BroadcastReceiver syncStaredReceiver = new BroadcastReceiver() {
    
            @Override
            public void onReceive(Context context, Intent intent) {
                Log.d(TAG, "Sync started!");
                Toast.makeText(getApplicationContext(), "Sync started...", Toast.LENGTH_SHORT).show();
            }
        };
    }

MyIPContentProvider

public class MyIPContentProvider extends ContentProvider {

public static final int IP_DATA=1;
private static final String AUTHORITY="sample.map.com.ipsyncadapter";
private static final String TABLE_IP_DATA="ip_data";
public static final Uri CONTENT_URI=Uri.parse("content://" + AUTHORITY + '/' + TABLE_IP_DATA);
private static final UriMatcher URI_MATCHER= new UriMatcher(UriMatcher.NO_MATCH);

static
{
    URI_MATCHER.addURI(AUTHORITY,TABLE_IP_DATA,IP_DATA);
}

private IpDataDBHelper myDB;

@Override
public boolean onCreate() {
    myDB=new IpDataDBHelper(getContext(),null,null,1);
    return false;
}

@Nullable
@Override
public Cursor query(Uri uri, String[] strings, String s, String[] strings1, String s1) {
    int uriType=URI_MATCHER.match(uri);
    Cursor cursor=null;
    switch (uriType)
    {
        case IP_DATA:
            cursor=myDB.getAllIpData();
            break;
        default:
            throw new IllegalArgumentException("UNKNOWN URL");
    }
    cursor.setNotificationUri(getContext().getContentResolver(), uri);
    return cursor;
}

@Nullable
@Override
public String getType(Uri uri) {
    return null;
}

@Nullable
@Override
public Uri insert(Uri uri, ContentValues contentValues) {
    int uriType=URI_MATCHER.match(uri);
    long id=0;
    switch (uriType)
    {
        case IP_DATA:
            id=myDB.AddIPData(contentValues);
            break;
        default:
            throw new IllegalArgumentException("UNKNOWN URI :" +uri);
    }
    getContext().getContentResolver().notifyChange(uri,null);
    return Uri.parse(contentValues + "/" + id);
}

@Override
public int delete(Uri uri, String s, String[] strings) {
    int uriType=URI_MATCHER.match(uri);
    int rowsDeleted=0;

    switch (uriType)
    {
        case IP_DATA:
            rowsDeleted=myDB.deleteAllIpData();
            break;
        default:
            throw new IllegalArgumentException("UNKNOWN URI :" +uri);
    }
    getContext().getContentResolver().notifyChange(uri,null);
    return rowsDeleted;
}

@Override
public int update(Uri uri, ContentValues contentValues, String s, String[] strings) {
    return 0;
}

}

SyncAdapter

public class SyncAdapter extends AbstractThreadedSyncAdapter {
ContentResolver mContentResolver;
Context mContext;
public static final String SYNC_STARTED="Sync Started";
public static final String SYNC_FINISHED="Sync Finished";
private static final String TAG=SyncAdapter.class.getCanonicalName();
public SharedPreferences mSharedPreferences;

public SyncAdapter(Context context, boolean autoInitialize) {
    super(context, autoInitialize);
    this.mContext=context;
    mContentResolver=context.getContentResolver();
    Log.i("SyncAdapter","SyncAdapter");
}

@Override
public void onPerformSync(Account account, Bundle bundle, String s, ContentProviderClient contentProviderClient, SyncResult syncResult) {

    Intent intent = new Intent(SYNC_STARTED);
    mContext.sendBroadcast(intent);

    Log.i(TAG, "onPerformSync");

    intent = new Intent(SYNC_FINISHED);
    mContext.sendBroadcast(intent);
    mSharedPreferences =mContext.getSharedPreferences("MyIp",0);
    SharedPreferences.Editor editor=mSharedPreferences.edit();

    mContentResolver.delete(MyIPContentProvider.CONTENT_URI,null,null);

    String data="";

    try {
        URL url =new URL("https://freegeoip.net/json/");
        Log.d(TAG, "URL :"+url);
        HttpURLConnection connection=(HttpURLConnection)url.openConnection();
        Log.d(TAG,"Connection :"+connection);
        connection.connect();
        Log.d(TAG,"Connection 1:"+connection);
        InputStream inputStream=connection.getInputStream();
        data=getInputData(inputStream);
        Log.d(TAG,"Data :"+data);

        if (data != null || !data.equals("null")) {
            JSONObject jsonObject = new JSONObject(data);


            String ipa = jsonObject.getString("ip");
            String country_code = jsonObject.getString("country_code");
            String country_name = jsonObject.getString("country_name");
            String region_code=jsonObject.getString("region_code");
            String region_name=jsonObject.getString("region_name");
            String zip_code=jsonObject.getString("zip_code");
            String time_zone=jsonObject.getString("time_zone");
            String metro_code=jsonObject.getString("metro_code");

            String city = jsonObject.getString("city");
            String latitude = jsonObject.getString("latitude");
            String longitude = jsonObject.getString("longitude");
           /* ContentValues values = new ContentValues();
            values.put("ip", ipa);
            values.put("country_code", country_code);
            values.put("country_name", country_name);
            values.put("city", city);
            values.put("latitude", latitude);
            values.put("longitude", longitude);*/
            //Using cursor adapter for results.
            //mContentResolver.insert(MyIPContentProvider.CONTENT_URI, values);

            //Using Shared preference for results.
            editor.putString("ipAdr",ipa);
            editor.putString("CCode",country_code);
            editor.putString("CName",country_name);
            editor.putString("City",city);
            editor.putString("Latitude",latitude);
            editor.putString("Longitude",longitude);
            editor.commit();

        }
        }catch(Exception e){
            e.printStackTrace();
        }

}

private String getInputData(InputStream inputStream) throws IOException {
    StringBuilder builder=new StringBuilder();
    BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream));
    //String data=null;
    /*Log.d(TAG,"Builder 2:"+ bufferedReader.readLine());
    while ((data=bufferedReader.readLine())!= null);
    {
        builder.append(data);
        Log.d(TAG,"Builder :"+data);
    }
    Log.d(TAG,"Builder 1 :"+data);
    bufferedReader.close();*/
    String data=bufferedReader.readLine();
    bufferedReader.close();
    return data.toString();
}

}

SyncService

public class SyncService extends Service {
private static SyncAdapter syncAdapter=null;
private static final Object syncAdapterLock=new Object();

@Override
public void onCreate() {
    synchronized (syncAdapterLock)
    {
        if(syncAdapter==null)
        {
            syncAdapter =new SyncAdapter(getApplicationContext(),true);
        }
    }
}

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

}