I have this simple service that broadcasts the current location of the user. I want to use the binding mechanism just to control the service life-cycle, but the service is just not starting.
What did I do wrong?
public class GPSActivity extends ListActivity {
...
protected void onResume() {
super.onResume();
Log.i("Service", "Service bound");
Intent intent = new Intent(this, LocationService.class);
bindService(intent, service_connection , Context.BIND_AUTO_CREATE);
}
protected void onPause() {
if (dataUpdateReceiver!=null)
unregisterReceiver(dataUpdateReceiver);
unbindService(service_connection);
super.onPause();
}
class LocationServiceConnection implements ServiceConnection{
public void onServiceConnected(ComponentName name, IBinder service) {
Log.i("Service", "Service Connected");
}
public void onServiceDisconnected(ComponentName name) {
}
}
}
LocalBinder.java
public class LocalBinder<S> extends Binder {
private String TAG = "LocalBinder";
private WeakReference<S> mService;
public LocalBinder(S service){
mService = new WeakReference<S>(service);
}
public S getService() {
return mService.get();
}
}
LocationService.java
public class LocationService extends Service {
public void onCreate() {
initLocationListener();
Log.i("Location Service","onCreate()");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("Location Service", "Received start id " + startId + ": " + intent);
return START_NOT_STICKY;
}
private final IBinder mBinder = new LocalBinder<LocationService>(this);
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
}
AndroidManifest.xml
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
...
<service android:name=".LocationService">
</service>
</application>
EDIT: Fixed thanks to NickT's answer.
The manifest entry did not have a intent filter or the correct name
<service
android:enabled="true"
android:name="com.android.gps.services.LocationService">
<intent-filter>
<action android:name="com.android.gps.services.LocationService" />
</intent-filter>
</service>
And the intent I used for binding was like the ones you need to use when starting an activity. the correct one is:
Intent intent = new Intent("com.android.gps.services.LocationService");
The onStartCommand will only execute if the service is explicitly started, it looks like you are just wanting to bind to it, which is fine. I don't see that you have set up the service connection properly though. I'm posting my stub program which shows how to bind to a service and call a method in the service through a binder. You may like to run this and see the sequence of the various log messages. You will obviously need to add your BroadcastReceiver and onLocationChaged code to make it useful for you.
The Activity
package com.servtest.test;
import com.servtest.test.LocationService.LocalBinder;
import android.app.Activity;
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.util.Log;
public class ServiceTestActivity extends Activity {
boolean mServiceConnected = false;
boolean mBound = false;
private LocationService mLocnServ;
ServiceConnection mServconn = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
Log.d("SVTEST", "Activity service connected");
LocalBinder binder = (LocalBinder) service;
mLocnServ = binder.getService();
// Can't call this methodInTheService UNTIL IT'S BOUND!
mLocnServ.methodInTheService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
Log.d("SVTEST", "Activity service disconnected");
mBound = false;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
public void onStart() {
super.onStart();
Log.d("SVTEST", "Activity onStart");
mServiceConnected = bindService(new Intent(
"com.servtest.test.LOCATIONSERVICE"), mServconn,
Context.BIND_AUTO_CREATE);
}
@Override
protected void onResume() {
super.onResume();
Log.d("SVTEST", "Activity onResume");
}
@Override
public void onPause() {
Log.d("SVTEST", "Activity onPause");
super.onPause();
}
@Override
public void onStop() {
Log.d("SVTEST", "Activity onStop");
if (mBound) {
unbindService(mServconn);
mBound = false;
}
super.onStop();
}
}
The Service
package com.servtest.test;
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
public class LocationService extends Service implements LocationListener {
private final IBinder mBinder = new LocalBinder();
@Override
public void onLocationChanged(Location arg0) {}
@Override
public void onProviderDisabled(String arg0) {}
@Override
public void onProviderEnabled(String arg0) {}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {}
@Override
public IBinder onBind(Intent intent) {
Log.d("SVTEST", "Loc service ONBIND");
return mBinder;
}
@Override
public boolean onUnbind(Intent intent) {
Log.d("SVTEST", "Loc service ONUNBIND");
return super.onUnbind(intent);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Won't run unless it's EXPLICITLY STARTED
Log.d("SVTEST", "Loc service ONSTARTCOMMAND");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d("SVTEST", "Loc service ONDESTROY");
}
public class LocalBinder extends Binder {
LocationService getService() {
// Return this instance of LocalService so clients can call public methods
return LocationService.this;
}
}
public void methodInTheService() {
// A method you can call in the service
Log.d("SVTEST", "Loc service EXECUTING THE METHOD");
}
}
The Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.servtest.test"
android:versionCode="1"
android:versionName="1.0" >
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".ServiceTestActivity"
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:enabled="true"
android:name="LocationService">
<intent-filter>
<action android:name="com.servtest.test.LOCATIONSERVICE" />
</intent-filter>
</service>
</application>
</manifest>
Hope this helps
I had my Activity implement ServiceConnection and bound like this:
bindService( new Intent( this, Service.class ), this, Context.BIND_AUTO_CREATE );
Then handled the callbacks for onServiceConnected() and onServiceDisconnected() in my Activity
When you call bindService you may get this error:
ActivityManager java.lang.ClassCastException: android.os.BinderProxy cannot be cast to com.android.server.am.ActivityRecord$Token
Check the output of logcat.
This is a bug of Android.
To solve it, use getApplicationContext().bindService(...)
来源：https://stackoverflow.com/questions/10581827/service-not-being-created-or-connecting-after-bindservice