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<service

  android:name="MyService"

  android:icon="@drawable/icon"

  android:label="@string/service_name"

  >

</service>

public class MyService extends Service {

  @Override

  public int onStartCommand(Intent intent, int flags, int startId) {

    //TODO do something useful

    return Service.START_NOT_STICKY;

  }

  @Override

  public IBinder onBind(Intent intent) {

  //TODO for communication return IBinder implementation

    return null;

  }

} 

package com.ebrahimi.servicedemo;

import android.app.Service;

import android.content.Intent;

import android.os.IBinder;

public class MyService extends Service {

         @Override

         public int onStartCommand(Intent intent, int flags, int startId) {

           //TODO do something useful

           return Service.START_NOT_STICKY;

         }

         @Override

         public IBinder onBind(Intent intent) {

         //TODO for communication return IBinder implementation

           return null;

         }

}

Intent i= new Intent(context, MyService.class);

// potentially add data to the intent

i.putExtra("KEY1", "Value to be used by the service");

context.startService(i); 

عنوان كليد

شرح عملكرد

Service.START_STICKY

اين سرويس در صورت كشته شدن بصورت خودكار اجرا خواهد شد. ورودي تابع onStartCommand مقدار null خواهد بود. اين كليد براي سرويسهائي استفاده مي شوند كه مستقل بوده و به مقدار ورودي از intent وابستگي ندارند

Service.START_NOT_STICKY

اين سرويس بصورت خودكار اجرا نخواهد شد و مناسب سرويسهائي است كه بصورت دوره اي اجرا مي شود. اين سرويس زماني مجددا اجرا خواهد شد كه متد startService() مجددا فراخواني شود

Service.START_REDELIVER_INTENT

اين سرويس مشابه كليد ثابت Service.START_STICKY  خواهد بود با اين تفاوت كه شي پاس داده شده توسط Intent بصورت كامل به متد onStartCommand پاس داده خواهد شد

<service

  android:name="WordService"

  android:process=":my_process" 

  android:icon="@drawable/icon"

  android:label="@string/service_name"

  >

</service>

Calendar cal = Calendar.getInstance();

Intent intent = new Intent(this, MyService.class);

PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);

AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

// Start every 30 seconds

alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 30*1000, pintent); 

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.URL;

import android.app.Activity;

import android.app.IntentService;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.os.Message;

import android.os.Messenger;

import android.util.Log;

public class DownloadService extends IntentService {

  private int result = Activity.RESULT_CANCELED;

  public static final String URL = "urlpath";

  public static final String FILENAME = "filename";

  public static final String FILEPATH = "filepath";

  public static final String RESULT = "result";

  public static final String NOTIFICATION = "com.vogella.android.service.receiver";

  public DownloadService() {

    super("DownloadService");

  }

  // will be called asynchronously by Android

  @Override

  protected void onHandleIntent(Intent intent) {

    String urlPath = intent.getStringExtra(URL);

    String fileName = intent.getStringExtra(FILENAME);

    File output = new File(Environment.getExternalStorageDirectory(),

        fileName);

    if (output.exists()) {

      output.delete();

    }

    InputStream stream = null;

    FileOutputStream fos = null;

    try {

      URL url = new URL(urlPath);

      stream = url.openConnection().getInputStream();

      InputStreamReader reader = new InputStreamReader(stream);

      fos = new FileOutputStream(output.getPath());

      int next = -1;

      while ((next = reader.read()) != -1) {

        fos.write(next);

      }

      // successfully finished

      result = Activity.RESULT_OK;

    } catch (Exception e) {

      e.printStackTrace();

    } finally {

      if (stream != null) {

        try {

          stream.close();

        } catch (IOException e) {

          e.printStackTrace();

        }

      }

      if (fos != null) {

        try {

          fos.close();

        } catch (IOException e) {

          e.printStackTrace();

        }

      }

    }

    publishResults(output.getAbsolutePath(), result);

  }

  private void publishResults(String outputPath, int result) {

    Intent intent = new Intent(NOTIFICATION);

    intent.putExtra(FILEPATH, outputPath);

    intent.putExtra(RESULT, result);

    sendBroadcast(intent);

  }

} 

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.vogella.android.service.receiver"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="17"

        android:targetSdkVersion="18" />

    <uses-permission android:name="android.permission.INTERNET" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.vogella.android.service.receiver.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <service android:name="com.vogella.android.service.receiver.DownloadService" >

        </service>

    </application>

</manifest> 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="onClick"

        android:text="Download" />

    <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Status: " />

        <TextView

            android:id="@+id/status"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Not started" />

    </LinearLayout>

</LinearLayout> 

package com.vogella.android.service.receiver;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.view.View;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

  private TextView textView;

  private BroadcastReceiver receiver = new BroadcastReceiver() {

    @Override

    public void onReceive(Context context, Intent intent) {

      Bundle bundle = intent.getExtras();

      if (bundle != null) {

        String string = bundle.getString(DownloadService.FILEPATH);

        int resultCode = bundle.getInt(DownloadService.RESULT);

        if (resultCode == RESULT_OK) {

          Toast.makeText(MainActivity.this,

              "Download complete. Download URI: " + string,

              Toast.LENGTH_LONG).show();

          textView.setText("Download done");

        } else {

          Toast.makeText(MainActivity.this, "Download failed",

              Toast.LENGTH_LONG).show();

          textView.setText("Download failed");

        }

      }

    }

  };

  @Override

  public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    textView = (TextView) findViewById(R.id.status);

  }

  @Override

  protected void onResume() {

    super.onResume();

    registerReceiver(receiver, new IntentFilter(DownloadService.NOTIFICATION));

  }

  @Override

  protected void onPause() {

    super.onPause();

    unregisterReceiver(receiver);

  }

  public void onClick(View view) {

    Intent intent = new Intent(this, DownloadService.class);

    // add infos for the service which file to download and where to store

    intent.putExtra(DownloadService.FILENAME, "index.html");

    intent.putExtra(DownloadService.URL,

        "http://www.vogella.com/index.html");

    startService(intent);

    textView.setText("Service started");

  }

} 

package de.vogella.android.ownservice.local;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

import android.app.Service;

import android.content.Intent;

import android.os.Binder;

import android.os.IBinder;

public class LocalWordService extends Service {

  private final IBinder mBinder = new MyBinder();

  private ArrayList<String> list = new ArrayList<String>();

  @Override

  public int onStartCommand(Intent intent, int flags, int startId) {

    Random random = new Random();

    if (random.nextBoolean()) {

      list.add("Linux");

    }

    if (random.nextBoolean()) {

      list.add("Android");

    }

    if (random.nextBoolean()) {

      list.add("iPhone");

    }

    if (random.nextBoolean()) {

      list.add("Windows7");

    }

    if (list.size() >= 20) {

      list.remove(0);

    }

    return Service.START_NOT_STICKY;

  }

  @Override

  public IBinder onBind(Intent arg0) {

    return mBinder;

  }

  public class MyBinder extends Binder {

    LocalWordService getService() {

      return LocalWordService.this;

    }

  }

  public List<String> getWordList() {

    return list;

  }

} 

package de.vogella.android.ownservice.local;

import java.util.Calendar;

import android.app.AlarmManager;

import android.app.PendingIntent;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

public class MyScheduleReceiver extends BroadcastReceiver {

  // restart service every 30 seconds

  private static final long REPEAT_TIME = 1000 * 30;

  @Override

  public void onReceive(Context context, Intent intent) {

    AlarmManager service = (AlarmManager) context

        .getSystemService(Context.ALARM_SERVICE);

    Intent i = new Intent(context, MyStartServiceReceiver.class);

    PendingIntent pending = PendingIntent.getBroadcast(context, 0, i,

        PendingIntent.FLAG_CANCEL_CURRENT);

    Calendar cal = Calendar.getInstance();

    // start 30 seconds after boot completed

    cal.add(Calendar.SECOND, 30);

    // fetch every 30 seconds

    // InexactRepeating allows Android to optimize the energy consumption

    service.setInexactRepeating(AlarmManager.RTC_WAKEUP,

        cal.getTimeInMillis(), REPEAT_TIME, pending);

    // service.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),

    // REPEAT_TIME, pending);

  }

} 

package de.vogella.android.ownservice.local;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

public class MyStartServiceReceiver extends BroadcastReceiver {

  @Override

  public void onReceive(Context context, Intent intent) {

    Intent service = new Intent(context, LocalWordService.class);

    context.startService(service);

  }

}

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="de.vogella.android.ownservice.local"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <application

        android:icon="@drawable/icon"

        android:label="@string/app_name" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <service

            android:name=".LocalWordService"

            android:icon="@drawable/icon"

            android:label="@string/service_name" >

        </service>

        <receiver android:name="MyScheduleReceiver" >

            <intent-filter>

                <action android:name="android.intent.action.BOOT_COMPLETED" />

            </intent-filter>

        </receiver>

        <receiver android:name="MyStartServiceReceiver" >

        </receiver>

    </application>

</manifest> 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="onClick"

        android:text="Update" > 

    </Button>

    <ListView

        android:id="@id/android:list"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

    </ListView>

</LinearLayout> 

package de.vogella.android.ownservice.local;

import java.util.ArrayList;

import java.util.List;

import android.app.ListActivity;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.view.View;

import android.widget.ArrayAdapter;

import android.widget.Toast;

public class MainActivity extends ListActivity {

  private LocalWordService s;

  @Override

  public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    wordList = new ArrayList<String>();

    adapter = new ArrayAdapter<String>(this,

        android.R.layout.simple_list_item_1, android.R.id.text1,

        wordList);

    setListAdapter(adapter);

  }

  @Override

  protected void onResume() {

    super.onResume();

    Intent intent= new Intent(this, LocalWordService.class);

    bindService(intent, mConnection,

        Context.BIND_AUTO_CREATE);

  }

  @Override

  protected void onPause() {

    super.onPause();

    unbindService(mConnection);

  }

  private ServiceConnection mConnection = new ServiceConnection() {

    public void onServiceConnected(ComponentName className, 

        IBinder binder) {

      LocalWordService.MyBinder b = (LocalWordService.MyBinder) binder;

      s = b.getService();

      Toast.makeText(MainActivity.this, "Connected", Toast.LENGTH_SHORT)

          .show();

    }

    public void onServiceDisconnected(ComponentName className) {

      s = null;

    }

  };

  private ArrayAdapter<String> adapter;

  private List<String> wordList;

  public void onClick(View view) {

    if (s != null) {

      Toast.makeText(this, "Number of elements" + s.getWordList().size(),

          Toast.LENGTH_SHORT).show();

      wordList.clear();

      wordList.addAll(s.getWordList());

      adapter.notifyDataSetChanged();

    }

  }

}