I like to exit my application immediately after starting a service.
The code below causes the activity to finish before the service is started.
How do I set a listener to prompt me when the service is started?
btn = (ImageButton) findViewById(R.id.button );
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startService(new Intent(MainActivity.this, MyService.class));
//I want to exit the activity here.
finish(); // this exits the activity before the service is started
}
});
The following are the codes I used, based on the proposal by #Er.Arjunsaini
on the ACTIVITY file, I register to listen for an "Exit App" broadcast.
private final BroadcastReceiver exitAppReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//activity exits when "exit app" broadcast received.
finish();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//REGISTER TO LISTEN FOR THE BROADCAST
LocalBroadcastManager.getInstance(this).
registerReceiver(exitAppReceiver, new IntentFilter(getString(R.string.exit_app)));
btn = (ImageButton) findViewById(R.id.my_button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startService( new Intent(this, MyService.class));
}
});
}
#Override
public void onDestroy() {
//UNREGISTER THE RECEIVER
LocalBroadcastManager.getInstance(this).
unregisterReceiver(exitFloatingWindowReceiver);
super.onDestroy();
}
on the SERVICE file, I send an "Exit APP" broadcast.
#Override
public void onCreate() {
super.onCreate();
//... do the rest of the Service initializing
//CLOSE ACTIVITY
LocalBroadcastManager.getInstance(this).
sendBroadcast(new Intent(getString(R.string.exit_app)));
}
check out ServiceConnection, onServiceConnected may be method you are looking for to call finish()
HERE you have example
If you use bindService() instead of startService(), you can use the Message based communication system between Activity and Service.
This is explained in this reference.
At the end of the section there's a link to sample classes:
-MessengerService.java
-MessengerServiceActivities.java
Here an example of an Activity with 2 button, one for starting the Service and one for sending a message to the Service that will resend a message to the Activity to close it.
MainActivity.java
package com.pasquapp.brodcasttest01;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.view.View;
import android.widget.Button;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
public final static int WHAT_CLOSE_ACTIVITY=1;
private Button startServiceButton;
private Button closeButton;
private Messenger activityMessenger;
private Messenger serviceMessenger;
private MyServiceConnection serviceConnection;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activityMessenger =new Messenger(new ActivityHandler());
initView();
}
#Override
protected void onDestroy() {
super.onDestroy();
if(serviceConnection!=null)
unbindService(serviceConnection);
}
private void initView(){
startServiceButton=findViewById(R.id.button_start_service);
startServiceButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startService();
}
});
closeButton=findViewById(R.id.button_close);
closeButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(serviceMessenger!=null){
Message msg=Message.obtain();
msg.replyTo=activityMessenger;
msg.what=MyService.WHAT_CLOSE_ACTIVITY;
try {
serviceMessenger.send(msg);
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
});
}
private class MyServiceConnection implements ServiceConnection{
#Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
serviceMessenger=new Messenger(iBinder);
}
#Override
public void onServiceDisconnected(ComponentName componentName) {
serviceMessenger=null;
}
}
private void startService(){
serviceConnection=new MyServiceConnection();
bindService(new Intent(this,MyService.class),serviceConnection,BIND_AUTO_CREATE);
}
private class ActivityHandler extends Handler{
#Override
public void handleMessage(#NonNull Message msg) {
int what=msg.what;
switch (what){
case WHAT_CLOSE_ACTIVITY:
MainActivity.this.finish();
break;
default:
super.handleMessage(msg);
}
}
}}
MyService.java
package com.pasquapp.brodcasttest01;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import androidx.annotation.NonNull;
public class MyService extends Service {
public static final int WHAT_CLOSE_ACTIVITY=1;
private Messenger mMessenger;
public MyService() {
}
#Override
public void onCreate() {
super.onCreate();
mMessenger=new Messenger(new ServiceHandler());
}
#Override
public IBinder onBind(Intent intent) {
return mMessenger.getBinder();
}
private class ServiceHandler extends Handler{
#Override
public void handleMessage(#NonNull Message msg) {
int what=msg.what;
switch (what){
case WHAT_CLOSE_ACTIVITY:
Messenger messenger=msg.replyTo;
Message closeMsg=Message.obtain();
closeMsg.what=MainActivity.WHAT_CLOSE_ACTIVITY;
try {
messenger.send(closeMsg);
} catch (RemoteException e) {
e.printStackTrace();
}
break;
default:
super.handleMessage(msg);
}
}
}
}
Related
I am studying services, and I have written a code to bind a service by clicking on a button, run a method of the service by clicking on another button and unbinding service by clicking on a third button.
If I try to run the method of the service before binding. I get, obviously, an error message, while if I first bind the service the method is normally called.
The question is, If I click on the third button to unbind the service, despite the service native method on Unbind(Intent intent) gives me a positive feedback, I'm still able to call the service method from the main activity like if it should still be bound.
Here is the Service code
package com.antonello.tavolaccio4;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;
/**
* Created by Antonello on 14/05/2017.
*/
public class Servizio extends Service{
public IBinder binder=new MyBinder();
#Nullable
#Override
public IBinder onBind(Intent intent) {
return binder;
}
#Override
public boolean onUnbind(Intent intent){
System.out.println("unbinded");
return false;
}
public class MyBinder extends Binder{
Servizio getService(){
return Servizio.this;
}
}
public void metodo(){
System.out.println("Metodo del service");
}
}
and here is the Main Activity code:
package com.antonello.tavolaccio4;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
ServiceConnection serviceConnection;
Servizio servizio;
Button button;
Button button2;
Button button3;
boolean bound;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(Button)findViewById(R.id.button);
button2=(Button)findViewById(R.id.button2);
button3=(Button)findViewById(R.id.button3);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent=new Intent(getApplicationContext(),Servizio.class);
bindService(intent,serviceConnection, Service.BIND_AUTO_CREATE);
}
});
button2.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
servizio.metodo();
}
});
button3.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
Intent intent=new Intent(getApplicationContext(),Servizio.class);
unbindService(serviceConnection);
}
});
serviceConnection = new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName name, IBinder service) {
Servizio.MyBinder binder=(Servizio.MyBinder)service;
servizio=binder.getService();
bound=true;
System.out.println(bound);
}
#Override
public void onServiceDisconnected(ComponentName name) {
}
};
}
}
Is there anything wrong in my unbindService method?
Thank you for any help.
Is there anything wrong in my unbindService method?
You do not have an unbindService() method. You are calling the one that you are inheriting from Context.
It is your job, as part of calling unbindService(), to also set to null any fields tied to the bound connection (in your case, servizio). As it stands, you are leaking memory, and any inherited methods that your service tries calling may throw exceptions because the service is destroyed.
I want perform some check continuously. I have defined AsyncTask as
follows,
new AsyncTask<String, Void, String>() {
#Override
protected void onPreExecute() {
Log.d(TAG, "onPreExecute()");
}
#Override
protected String doInBackground(String... params) {
sendData(array);
return null;
}
#Override
protected void onPostExecute(String res) { }
}.execute(userResponse);
But when I terminate the application then thread stops execution.
Service class demo :-
package com.example.My Application;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
public class MyService extends Service {
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Let it continue running until it is stopped.
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
}
Activity :-
package com.example.My Application;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.content.Intent;
import android.view.View;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
// Method to start the service
public void startService(View view) {
startService(new Intent(getBaseContext(), MyService.class));
}
// Method to stop the service
public void stopService(View view) {
stopService(new Intent(getBaseContext(), MyService.class));
}
}
Manifest :-
Add <service android:name=".MyService" />
I'm supposed to add a timer to my service class that prints a message to LogCat every 10 seconds. Nothing in the service class is printing once I call the startService method and I have no idea why.. Any ideas?
package com.murach.reminder;
import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class ReminderActivity extends Activity implements OnClickListener {
private Button startServiceButton;
private Button stopServiceButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reminder);
startServiceButton = (Button) findViewById(R.id.startServiceButton);
stopServiceButton = (Button) findViewById(R.id.stopServiceButton);
startServiceButton.setOnClickListener(this);
stopServiceButton.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Intent serviceIntent = new Intent(this, ReminderService.class);
switch (v.getId()) {
case R.id.startServiceButton:
// put code to start service and display toast here
startService(serviceIntent);
Toast.makeText(this, "Service started", Toast.LENGTH_SHORT).show();
break;
case R.id.stopServiceButton:
// put code to stop service and display toast here
stopService(serviceIntent);
Toast.makeText(this, "Service stopped", Toast.LENGTH_SHORT).show();
break;
}
}
}
package com.murach.reminder;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import java.util.Timer;
import java.util.TimerTask;
public class ReminderService extends Service
{
private Timer timer;
public void onCreate()
{
Log.d("Reminder", "Service created");
startTimer();
}
#Override
public IBinder onBind(Intent intent)
{
Log.d("Reminder", "No binding for this activity");
return null;
}
public void onDestroy()
{
Log.d("Reminder", "Service destroyed");
stopTimer();
}
private void startTimer() {
TimerTask task = new TimerTask() {
public void run() {
Log.d("Reminder", "Timer task executed");
}
};
timer = new Timer(true);
int delay = 1000 * 10;
int interval = 1000 * 10;
timer.schedule(task, delay, interval);
}
private void stopTimer()
{
if (timer != null)
{
timer.cancel();
}
}
}
And here is how I register the service in the Manifest (in a service element, it wouldn't let me type it out completely)
android:name="com.murach.reminder.ReminderService"
The package names do not match. There is a spelling mistake in the word murach in your Manifest declaration.
I want to implement a simple messenger application for Android devices,I'm working with a web service which contains all the required methods for sending and receiving(by pressing the send button a record will be inserted in the DB and by calling the receive method all the rows related to this receiver(user) are retrieved).
I've written a service in a separate class and in onStart() I check the receive method of my .Net web service,I start the service in onCreate() of my activity ,so the service is in the background and receives the incoming messages perfectly,I can show the new message by using a toast directly in my service code,but I know that for accessing the views which are in my activity I should use pendingintent and maybe a BroadcastReceiver,so I can add the new messages to the main screen of my activity(for example a textview).
Now I want to find a way to access the textview of my activity and set the text of it through my service or anything else...
please help me on this issue,
Here is my activity:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MyOwnActivity extends Activity
{
Button btnSend;
Button btnExtra;
EditText txtMessageBody;
TextView lblMessages;
BerryService BS = new BerryService();
public void SetMessageHistory(String value)
{
txtMessageBody.setText(value);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnSend = (Button) findViewById(R.id.btnSend);
btnExtra = (Button) findViewById(R.id.btnExtraIntent);
txtMessageBody = (EditText) findViewById(R.id.txtMessageBody);
lblMessages = (TextView) findViewById(R.id.lblMessages);
/////////
//////////
startService(new Intent(this, IncomingMessageService.class));
btnSend.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// call webservice method to send
BS.SetSoapAction("http://tempuri.org/Send");
BS.SetMethodName("Send");
String a = BS.SendMessage(txtMessageBody.getText().toString());
lblMessages.setText(lblMessages.getText().toString() + "\n"
+ txtMessageBody.getText().toString());
txtMessageBody.setText("");
}
});
}
}
Here is my service:
import java.util.Timer;
import java.util.TimerTask;
import android.app.ActivityManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.SystemClock;
import android.widget.Toast;
public class IncomingMessageService extends Service
{
private static final int NOTIFY_ME_ID = 12;
BerryService BS = new BerryService();
String text = "";
#Override
public IBinder onBind(Intent intent) {
throw new UnsupportedOperationException("Bind Failed");
}
#Override
public void onCreate() {
Toast.makeText(this, "onCreate", 5000).show();
}
#Override
public void onStart(Intent intent, int startId) {
// ////////////////////////
Toast.makeText(this, "onStart ", 1000).show();
// Timer Tick
final Handler handler = new Handler();
Timer _t = new Timer();
TimerTask tt = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "tick ", 1000)
.show();
// here the receive method should be called
BS.SetSoapAction("http://tempuri.org/RecieveMessage");
BS.SetMethodName("RecieveMessage");
String receivedMsg = BS.ReceiveMessage("sh");
//Instead of toast I want to access the textview in my activity!!!!!
Toast.makeText(getApplicationContext(), receivedMsg, 5000).show();
}
});
}
};
_t.scheduleAtFixedRate(tt, 0, 1000);
}
// /
#Override
public void onDestroy() {
Toast.makeText(this, "onDestroy", 5000).show();
}
}
You need to understand the concept of Broadcast, in your case it is the correct solution.
Start Broadcast in its activity
public static final String ACTION = "com.yourapp.ACTION.TEXT_RECEIVED";
private BroadcastReceiver mReceiver;
#Override
public void onCreate(Bundle savedInstanceState) {
////////
mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String msg = intent.getStringExtra("msg");
yourTextView.setText(msg);
}
};
IntentFilter filter = new IntentFilter(ACTION);
filter.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(mReceiver, filter);
////////
}
protected void onDestroy() {
// remember to unregister the receiver
super.onDestroy();
if (mReceiver != null) {
unregisterReceiver(mReceiver);
}
}
When you need to send the message of service you should use:
Intent i = new Intent();
i.setAction(MyOwnActivity.ACTION);
i.addCategory(Intent.CATEGORY_DEFAULT);
i.putExtra("msg", "the message received by webservice");
i.putExtras(b);
sendBroadcast(i);
Have a look here: http://developer.android.com/reference/android/content/BroadcastReceiver.html
Using a broadcast manager is great but I personally prefer to use square's Otto because it is just so easy to perform communication between components in an android application.
http://square.github.io/otto/
If you do choose to use otto, you are going to have to override the Bus's post method to be able to talk post messages to a bus on the foreground. Here is the code for that:
public class MainThreadBus extends Bus {
private final Handler handler = new Handler(Looper.getMainLooper());
#Override public void post(final Object event) {
if (Looper.myLooper() == Looper.getMainLooper()) {
super.post(event);
} else {
handler.post(new Runnable() {
#Override
public void run() {
post(event);
}
});
}
}
}
I am writing a simple service application, below is the code of Activity and Service..,when I am calling startService(), and stopService() its working fine for the one time,in my case it has to give notification..from next time onwards if call again startService(), and stopService() its not giving desired results...
---------- this is my activity class -------------
package com.mypack.serviceex;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class serviceex extends Activity implements Button.OnClickListener{
/** Called when the activity is first created. */
Button bt1,bt2;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bt1 = (Button) findViewById(R.id.Button01);
bt2 = (Button) findViewById(R.id.Button02);
bt1.setOnClickListener(this);
bt2.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if( v == bt1)
{
Intent i = new Intent(serviceex.this,myservice.class);
Log.i("err","onClick(View v....");
startService(i);
}
else if(v == bt2)
{
Intent i = new Intent(serviceex.this,myservice.class);
Log.i("err","else if(v == bt2)........");
stopService(i);
}
}
}
--------- this is my service -------------
package com.mypack.serviceex;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class myservice extends Service
{
private NotificationManager nmgr;
public void onCreate()
{
super.onCreate();
nmgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Log.i("err","onCreate..........");
Thread th = new Thread(null,new incls(),"service...");
}
public void onStart(Intent intent,int sid)
{
super.onStart(intent, sid);
Log.i("err","onStart........");
}
public void onDestroy()
{
super.onDestroy();
Log.i("err","onDestroy..........");
displayMessage("Stopping Service");
}
public void displayMessage(String str)
{
Log.i("err.","displayMessage.....");
Notification nf = new Notification(R.drawable.icon,str,System.currentTimeMillis());
PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this,myservice.class), 0);
nf.setLatestEventInfo(this, "Service...", str, pi);
nmgr.notify(R.string.uid, nf);
}
private class incls implements Runnable
{
public void run()
{
Log.i("err","public void run()..........");
System.out.println("In Runnn");
}
}
#Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
}
None of your methods are #Overrideing the class methods. You have to annote them with #Override. Also, on 2.1 you should use onStartCommand() instead of onStart(). And also note that calling startService() multiple times will only call onCreate() once