Develop Reference

Receive message from MQTT in android service

I have to create an Android app that can receive message from a sensor and send a notification to the user when a message is received. I have to do this with out using service like Google Firebase because all the system must run locally. I thought to use MQTT in a service, but when I kill the app, it disconnect from the broker. If the app is running in background this implementation works but I need to keep the connection alive also when app is killed.
This is my implementation of the service:
package it.unisalento.sonoff.helper;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;
import android.net.wifi.aware.AttachCallback;
import android.os.Build;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Process;
import android.widget.Toast;
import androidx.core.app.NotificationCompat;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallbackExtended;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import java.util.ArrayList;
import java.util.List;
import it.unisalento.sonoff.R;
import it.unisalento.sonoff.view.MainActivity;
public class Service extends android.app.Service {
private Looper serviceLooper;
private ServiceHandler serviceHandler;
private List ids = new ArrayList();
private MqttHelper mqttHelper;
private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}
#Override
public void handleMessage(Message msg) {
showNotification("Aggiornamento di stato", String.valueOf(msg.arg1));
}
}
#Override
public void onCreate() {
HandlerThread thread = new HandlerThread("ServiceStartArguments",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
serviceLooper = thread.getLooper();
serviceHandler = new ServiceHandler(serviceLooper);
mqttHelper = new MqttHelper(getApplicationContext());
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
mqttHelper = new MqttHelper(getApplicationContext());
mqttHelper.setCallback(new MqttCallbackExtended() {
#Override
public void connectComplete(boolean reconnect, String serverURI) {
}
#Override
public void connectionLost(Throwable cause) {
}
#Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
Message msg = serviceHandler.obtainMessage();
msg.arg1 = startId;
serviceHandler.sendMessage(msg);
}
#Override
public void deliveryComplete(IMqttDeliveryToken token) {
}
});
mqttHelper.connect();
return START_STICKY;
}
#Override
public IBinder onBind(Intent intent) {
// We don't provide binding, so return null
return null;
}
#Override
public void onDestroy() {
Toast.makeText(this, "service done", Toast.LENGTH_SHORT).show();
}
private void showNotification(String title, String message) {
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
String channelId = "notification_channel";
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, channelId)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setPriority(Notification.PRIORITY_MAX)
.setDefaults(Notification.DEFAULT_VIBRATE)
.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager) getSystemService(getApplicationContext().NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(channelId, "lock", NotificationManager.IMPORTANCE_HIGH);
channel.enableVibration(true);
notificationManager.createNotificationChannel(channel);
}
int id;
if(ids.isEmpty()){
id=0;
}
else{
id = ids.size();
}
ids.add(id);
notificationManager.notify(id , notificationBuilder.build());
}
}
And here my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="it.unisalento.sonoff">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme.FullScreen"
android:usesCleartextTraffic="true">
<!-- MqttService -->
<service android:name="org.eclipse.paho.android.service.MqttService" />
<service android:name=".helper.Service"
android:exported="false"
android:stopWithTask="false"/>
<activity android:name=".view.DashboardActivity"/>
<activity
android:name=".view.LoginActivity"
android:exported="true"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".view.MainActivity"/>
</application>

You need to use Foreground Services and pass the notification you built in startForeground method.

Why doesn't the notification appear?

I have made an app to test to show a foreground service and then tried to implement it in real app to close wifi after certain time, the code is the same as my test app but it doesn't show notification.
the service works fine but without notification
Main Activity
package com.example.countdownclosewifi.UI;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.widget.Toast;
import com.example.countdownclosewifi.MyService;
import com.example.countdownclosewifi.R;
import com.example.countdownclosewifi.databinding.ActivityMainBinding;
public class MainActivity extends AppCompatActivity {
private ActivityMainBinding binding;
private BroadcastReceiver receiver;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
// Intent filter to set the same action of the broadcast sender
IntentFilter intentFilter_getRemainingTime = new IntentFilter();
intentFilter_getRemainingTime.addAction("Count");
// what will happen when the app receive a broadcast
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
int i = intent.getIntExtra("Show", 0);
binding.timeLeft.setText(String.valueOf(i));
}
};
registerReceiver(receiver, intentFilter_getRemainingTime);
binding.start.setOnClickListener(view -> {
if (binding.setTime.getText().toString().isEmpty() || Long.parseLong(binding.setTime.getText().toString()) == 0) {
Toast.makeText(MainActivity.this, "Enter the duration", Toast.LENGTH_SHORT).show();
} else {
Intent serviceIntent = new Intent(this, MyService.class);
int time = Integer.parseInt(binding.setTime.getText().toString());
serviceIntent.putExtra("Time", time);
if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.O){
startForegroundService(serviceIntent);
}
else {
startService(serviceIntent);
}
}
});
}
#Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
}
Service class
package com.example.countdownclosewifi;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
//import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.os.IBinder;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
import com.example.countdownclosewifi.UI.MainActivity;
import java.util.Timer;
import java.util.TimerTask;
public class MyService extends Service {
private WifiManager wifiManager;
private int timeRemaining;
private Timer timer;
// Intent intent;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
IntentFilter intentFilter_stop = new IntentFilter();
intentFilter_stop.addAction("Stop timer");
timeRemaining = intent.getIntExtra("Time", 0);
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
if (timeRemaining == 0) {
wifiManager.setWifiEnabled(false);
timer.cancel();
stopSelf();
}
setNotification(timeRemaining);
Intent intent = new Intent();
intent.setAction("Count");
intent.putExtra("Show", timeRemaining);
sendBroadcast(intent);
timeRemaining -= 1;
}
}, 0, 1000);
return START_STICKY;
}
public void setNotification(int timeRemaining) {
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent =
PendingIntent.getActivity(this, 0, notificationIntent, 0);
String channel_id = "id";
Notification notification;
if (Build.VERSION.SDK_INT>= Build.VERSION_CODES.O) {
notification = new Notification.Builder(this, channel_id)
.setContentTitle("You are running out of time")
.setContentText(String.valueOf(timeRemaining))
.setSmallIcon(R.drawable.wifi_24)
.setContentIntent(pendingIntent)
.setOnlyAlertOnce(true)
.build();
} else {
notification = new NotificationCompat.Builder(this, channel_id)
.setContentTitle("You are running out of time")
.setContentText(String.valueOf(timeRemaining))
.setSmallIcon(R.drawable.wifi_24)
.setContentIntent(pendingIntent)
.setOnlyAlertOnce(true)
.build();
}
// Notification ID cannot be 0.
startForeground(1, notification);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
String id = "Notification Channel";
CharSequence name = "notification";
NotificationChannel notificationChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_DEFAULT);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(notificationChannel);
}
}
#Override
public void onDestroy() {
super.onDestroy();
stopForeground(true);
}
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.countdownclosewifi">
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.CountDownCloseWIFI">
<activity android:name=".UI.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".MyService"/>
</application>
</manifest>
it's so clear but i cant see what i am missing to show this notification.

use countdowntimer class instead of timerTask
and set the priority as MAX
NotificationManager.IMPORTANCE_HIGH

I Solved it, the problem was that the Notification ID was not the same as the Channel ID

Cannot start Service in API 23

I am trying to experiment with services, and I found this example:
Alarm Manager Example.
I tried using the accepted answer, and the changes AndroidDev suggested, but I cant get it to work. Based on the fact that none of my Log messages appear, I think that the Service isn't called.
My onCreate method is this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Intent serviceIntent = new Intent(this, YourService.class);
startService(serviceIntent);
Vibrator v=(Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 500 milliseconds
v.vibrate(500);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
the Service is this:
package habos.alarmtest;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class YourService extends Service
{
Alarm alarm = new Alarm();
String tag="Babis service";
public void onCreate()
{
super.onCreate();
Log.i(tag, "oncreate");
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.i(tag, "onstartcommand");
alarm.setAlarm(this);
return START_STICKY;
}
#Override
public void onStart(Intent intent, int startId)
{
alarm.setAlarm(this);
}
#Override
public IBinder onBind(Intent intent)
{
return null;
}
}
The onStart method is deprecated, but onStartCommand should work.
the manifest is this
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="habos.alarmtest">
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
<uses-permission android:name="android.permission.VIBRATE"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<receiver android:name=".Alarm" android:exported="true">
<intent-filter>
<action android:name="habos.START_ALARM" >
</action>
</intent-filter>
</receiver>
<activity
android:name=".MainActivity"
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>
</application>
and the alarm is this
package habos.alarmtest;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;
import android.util.Log;
import android.widget.Toast;
import android.os.Vibrator;
public class Alarm extends BroadcastReceiver
{
String tag="Babis alarm";
#Override
public void onReceive(Context context, Intent intent)
{
Log.i(tag, "onreceive");
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
wl.acquire();
// Put here YOUR code.
Toast.makeText(context, "Alarm !!!!!!!!!!", Toast.LENGTH_LONG).show(); // For example
Vibrator v=(Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 500 milliseconds
v.vibrate(500);
wl.release();
}
public void setAlarm(Context context)
{
Log.i(tag,"setalarm");
AlarmManager am =( AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent("mypackage.START_ALARM");
PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * 30,pi); // Millisec * Second * Minute
}
public void cancelAlarm(Context context)
{
Intent intent = new Intent(context, Alarm.class);
PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(sender);
}
}
added 2 more Logs, before and after the startService,the logcat is here:
https://www.dropbox.com/s/0ksdrfzyjb0qafe/logcat.txt?dl=0
(sorry I didn't paste it directly here, the code block didn't work for some reason)

Scheduled notifications don't appear

I'm developing my first Android app, Todo List, and i have to schedule notification at custom date(in 24 hr format) & time with date & timepicker.
Notifications don't appear as scheduled !
Can someone tell me what is the problem with my code?
My code :
Manifest :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.todo.amine.mytodo"
android:versionCode="2"
android:versionName="1.1">
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".Main"
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=".MyAlarm"
android:enabled="true" />
<receiver android:name=".MyReceiver">
</receiver>
</application>
</manifest>
CreateNotify Method :
public void createNotify(int month, int year, int day, int hour, int m){
Calendar c = Calendar.getInstance();
Date temp = c.getTime();
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.DAY_OF_MONTH, day);
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, 0);
/** calendar.set(Calendar.AM_PM,Calendar.PM);**/
Date pm = calendar.getTime();
if(pm.after(temp))
{
Intent myIntent = new Intent(Main.this, MyReceiver.class);
pendingIntent = PendingIntent.getBroadcast(Main.this, 0, myIntent,0);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent);
}
}
MyAlarm.class
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
public class MyAlarm extends Service
{
private NotificationManager mManager;
#Override
public IBinder onBind(Intent arg0)
{
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate()
{
// TODO Auto-generated method stub
super.onCreate();
}
#SuppressWarnings("static-access")
#Override
public void onStart(Intent intent, int startId)
{
super.onStart(intent, startId);
mManager = (NotificationManager) this.getApplicationContext().getSystemService(this.getApplicationContext().NOTIFICATION_SERVICE);
Intent intent1 = new Intent(this.getApplicationContext(),Main.class);
Notification notification = new Notification(R.drawable.ic_appxhdpi,"This is a test message!", System.currentTimeMillis());
intent1.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP| Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingNotificationIntent = PendingIntent.getActivity( this.getApplicationContext(),0, intent1,PendingIntent.FLAG_UPDATE_CURRENT);
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.setLatestEventInfo(this.getApplicationContext(), `"AlarmManagerDemo", "This is a test message!", pendingNotificationIntent);`
mManager.notify(0, notification);
}
#Override
public void onDestroy()
{
// TODO Auto-generated method stub
super.onDestroy();
}
}
MyReceive.class
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class MyReceiver extends BroadcastReceiver
{
#Override
public void onReceive(Context context, Intent intent)
{
Intent service1 = new Intent(context, MyAlarm.class);
context.startService(service1);
}
}

proximity alert does not fire and notify

Does anyone know what is the issue that cause fire alert not working when get into the proximity radius? I has been struggled for a week in solving this issue and I will really appreciated if anyone can help me out on this issue or give me some guide to complete it.
MainActivity.java
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
public class MainActivity extends Activity {
private static final long POINT_RADIUS = 150; // in Meters
private static final long PROX_ALERT_EXPIRATION = -1; // will not expire
private static final String PROX_ALERT_INTENT = "com.example.myalert";
private LocationManager locationManager;
double latitude = 2.81202, longitude = 101.75989;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Intent intent = new Intent(PROX_ALERT_INTENT);
PendingIntent proximityIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
locationManager.addProximityAlert(latitude, longitude, POINT_RADIUS, PROX_ALERT_EXPIRATION, proximityIntent);
}
}
ProximityReceiver.java
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.location.LocationManager;
import android.util.Log;
public class ProximityReceiver extends BroadcastReceiver{
private static final int NOTIFICATION_ID = 1000;
#SuppressWarnings("deprecation")
#Override
public void onReceive(Context context, Intent intent) {
String key = LocationManager.KEY_PROXIMITY_ENTERING;
Boolean entering = intent.getBooleanExtra(key, false);
if (entering) {
Log.d(getClass().getSimpleName(), "entering");
}else {
Log.d(getClass().getSimpleName(), "exiting");
}
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent notificationIntent = new Intent(context, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
Notification notification = createNotification();
notification.setLatestEventInfo(context, "Proximity Alert!", "You are near your point of interest.", pendingIntent);
notificationManager.notify(NOTIFICATION_ID, notification);
}
private Notification createNotification() {
Notification notification = new Notification();
notification.icon = R.drawable.ic_launcher;
notification.when = System.currentTimeMillis();
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.flags |= Notification.FLAG_SHOW_LIGHTS;
notification.defaults |= Notification.DEFAULT_VIBRATE;
notification.defaults |= Notification.DEFAULT_LIGHTS;
notification.ledARGB = Color.WHITE;
notification.ledOnMS = 1500;
notification.ledOffMS = 1500;
return notification;
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myalert"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.VIBRATE" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.myalert.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>
<activity
android:name="ProximityReceiver">
</activity>
</application>
</manifest>

you have not set the receiver in the manifest, "ProximityReceiver" is not an Activity but a receiver.
Try something like this.
<receiver android:name="ProximityReceiver" >
<intent-filter>
<action android:name="com.example.myalert" />
</intent-filter>
</receiver>
Cheers.