Use the LocalBroadcastManager class in the support v4 package to facilitate Service and Activity interaction.

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="uk.ac.essex.LocalServiceBroadcaster"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="7" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:name=".LocalServiceBroadcasterActivity"            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="LocalServiceBroadcasterActivity$LocalService"            android:stopWithTask="true" >        </service>    </application></manifest>

LocalBroadcastManagerActivity class:

package uk.ac.essex.LocalServiceBroadcaster;import android.app.Activity;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.os.Handler;import android.os.IBinder;import android.os.Message;import android.support.v4.app.ServiceCompat;import android.support.v4.content.LocalBroadcastManager;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class LocalServiceBroadcasterActivity extends Activity {static final String ACTION_STARTED = "com.example.android.supportv4.STARTED";static final String ACTION_UPDATE = "com.example.android.supportv4.UPDATE";static final String ACTION_STOPPED = "com.example.android.supportv4.STOPPED";LocalBroadcastManager mLocalBroadcastManager;BroadcastReceiver mReceiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// This is where we print the data we get back.final TextView callbackData = (TextView) findViewById(R.id.callback);// Put in some initial text.callbackData.setText("No broadcast received yet");// We use this to send broadcasts within our local process.mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);// We are going to watch for interesting local broadcasts.IntentFilter filter = new IntentFilter();filter.addAction(ACTION_STARTED);filter.addAction(ACTION_UPDATE);filter.addAction(ACTION_STOPPED);mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {if (intent.getAction().equals(ACTION_STARTED)) {callbackData.setText("STARTED");} else if (intent.getAction().equals(ACTION_UPDATE)) {callbackData.setText("Got update: " + intent.getIntExtra("value", 0));} else if (intent.getAction().equals(ACTION_STOPPED)) {callbackData.setText("STOPPED");}}};mLocalBroadcastManager.registerReceiver(mReceiver, filter);// Watch for button clicks.Button button = (Button) findViewById(R.id.start);button.setOnClickListener(mStartListener);button = (Button) findViewById(R.id.stop);button.setOnClickListener(mStopListener);}@Overrideprotected void onDestroy() {super.onDestroy();mLocalBroadcastManager.unregisterReceiver(mReceiver);}private OnClickListener mStartListener = new OnClickListener() {public void onClick(View v) {startService(new Intent(LocalServiceBroadcasterActivity.this, LocalService.class));}};private OnClickListener mStopListener = new OnClickListener() {public void onClick(View v) {stopService(new Intent(LocalServiceBroadcasterActivity.this, LocalService.class));}};public static class LocalService extends Service {LocalBroadcastManager mLocalBroadcastManager;int mCurUpdate;static final int MSG_UPDATE = 1;Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case MSG_UPDATE: {mCurUpdate++;Intent intent = new Intent(ACTION_UPDATE);intent.putExtra("value", mCurUpdate);mLocalBroadcastManager.sendBroadcast(intent);Message nmsg = mHandler.obtainMessage(MSG_UPDATE);mHandler.sendMessageDelayed(nmsg, 1000);}break;default:super.handleMessage(msg);}}};@Overridepublic void onCreate() {super.onCreate();mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);}public int onStartCommand(Intent intent, int flags, int startId) {// Tell any local interested parties about the start.mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STARTED));// Prepare to do update reports.mHandler.removeMessages(MSG_UPDATE);Message msg = mHandler.obtainMessage(MSG_UPDATE);mHandler.sendMessageDelayed(msg, 1000);return ServiceCompat.START_STICKY;}@Overridepublic void onDestroy() {super.onDestroy();// Tell any local interested parties about the stop.mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STOPPED));// Stop doing updates.mHandler.removeMessages(MSG_UPDATE);}@Overridepublic IBinder onBind(Intent intent) {return null;}}}

Main. xml layout file:

<? 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: gravity = "center_horizontal" android: orientation = "vertical" android: padding = "4dip"> <TextView android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: layout_weight = "0" android: paddingBottom = "4dip" android: text = "demonstrate how to use LocalBroadcastManager to communicate between Service and Activity"/> <Button android: id = "@ + id/start" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: text = "enable service"> <requestFocus/> </Button> <Button android: id = "@ + id/stop" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: text = "Stop Service"> </Button> <TextView android: id = "@ + id/callback" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: layout_weight = "0" android: gravity = "center_horizontal" android: paddingTop = "4dip"/> </LinearLayout

Remember to add android-support-v4.jar and add classpath