Android: cannot pass value from service to activity using putExtra and getLongExtra

Android: cannot pass value from service to activity using putExtra and getLongExtra - android

I am trying to pass a value from a service to an activity. Here is what I do:
In my service I have:
public class MyService extends Service {
...
private long b;
public static final String BROADCAST_ACTION = "test";
private final Handler handler = new Handler();
Intent intentDisp;
...
#Override
public void onCreate() {
...
b = 0;
intentDisp = new Intent(BROADCAST_ACTION);
...
}
#Override
public int onStartCommand( Intent intent, int flags, int startId ) {
handler.removeCallbacks(sendUpdatesToUI);
handler.postDelayed(sendUpdatesToUI, 1000); // 1 second
...
}
private Runnable sendUpdatesToUI = new Runnable() {
public void run() {
b = (long) 2.0;
intentDisp.putExtra("connected", b);
sendBroadcast(intentDisp);
handler.postDelayed(this, 2000); // 5 seconds
}
};
In my main Activity I have:
public class MainActivity extends Activity implements OnClickListener {
...
private Intent intentDisp1;
#Override
public void onCreate(Bundle savedInstanceState) {
...
intentDisp1 = new Intent(this, MyService.class);
}
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
updateUI(intent);
}
};
#Override
public void onResume() {
super.onResume();
startService(intentDisp1);
registerReceiver(broadcastReceiver, new IntentFilter(MyService.BROADCAST_ACTION));
}
#Override
protected void onPause() {
super.onPause();
unregisterReceiver(broadcastReceiver);
stopService(intentDisp1);
}
private void updateUI(Intent intent) {
long c = intentDisp1.getLongExtra("connected",-1);
...
}
When I debug the program I always get the value of -1 for c while I am passing the value of 2 from MyServive. Any idea what is wrong?

Related

Running countdown timer faster when i back to activity

I make a service for countdown timer, in activity i put a text view for show time every seconds: 100 - 0, but when i leave activity and back to that. i see timer as run very fast, but i want to this run just every second. where is problem ?
MainActivity:
public static final String mBroadcastIntegerAction = "com.example.broadcast.integer";
private IntentFilter mIntentFilter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showTime = (TextView) findViewById(R.id.textView1);
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(mBroadcastIntegerAction);
Intent serviceIntent = new Intent(this, AppServiceDay.class);
startService(serviceIntent);
}
#Override
public void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
}
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(mBroadcastIntegerAction)) {
int second = intent.getIntExtra("Time", 0);
showTime.setText("" + second);
}
}
};
#Override
protected void onPause() {
registerReceiver(mReceiver, mIntentFilter);
// unregisterReceiver(mReceiver);
super.onPause();
}
Service:
public class AppServiceDay extends Service {
CountDownTimer cdt;
public static Handler mHandler;
int downer = 1000;
int time = 100;
int mainTime = 100000;
#Override
public void onCreate() {
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
cdt = new CountDownTimer(mainTime, downer) {
#Override
public void onTick(long millisUntilFinished) {
time -= 1;
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(MainActivity.mBroadcastIntegerAction);
broadcastIntent.putExtra("Time", time);
sendBroadcast(broadcastIntent);
}
#Override
public void onFinish() {
time = 100;
this.start();
}
};
cdt.start();
return super.onStartCommand(intent, flags, startId);
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
}

onStartCommand is triggered everytime startService is called and in onStartCommand you are creating new countdown object,
Add a null check before creating new countdown object it will fix your duplicate timer running at same time.
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
If(cdt == null) {
cdt = new CountDownTimer(mainTime, downer) {
#Override
public void onTick(long millisUntilFinished) {
time -= 1;
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(MainActivity.mBroadcastIntegerAction);
broadcastIntent.putExtra("Time", time);
sendBroadcast(broadcastIntent);
}
#Override
public void onFinish() {
time = 100;
this.start();
}
};
cdt.start();
}
return super.onStartCommand(intent, flags, startId);
}

Sending Intent from BroadcastReceiver class to currently running activity

I have a class which extends BroadcastReceiver. On receiving a SMS, I would like to pass information to my main activity class to display the text in a box (Append, if already text is present).
public class SmsReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent)
{
Intent i = new Intent(context, MainActivity.class);
i.putExtra("updatedString","Hello");
context.startActivity(i);
}
}
MainActivity.java
public class MainActivity extends Activity{
private TextView results;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bundle extras = getIntent().getExtras();
if(extras!=null){
results = (TextView) findViewById(R.id.results);
results.setVisibility(View.VISIBLE);
results.append(extras.getString("updatedString"));
}
}
I have only one activity class (MainActivity.java). However When i do this I get an exception Unable to pause Activity.

You have three ways:
1) You can define your broadcast inside your MainActivity like this:
in onCreate()
registerReceiver(smsReceiver, new IntentFilter(SMS_RECIEVED));
and define smsReciver in MainActivity
private BroadcastReceiver smsReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//you can update textBox here
handler.postDelayed(sendUpdatesToUI, 10);
}
};
define a runnable to update UI
private Runnable sendUpdatesToUI = new Runnable() {
public void run() {
update();
}
};
and update method
private void update(String text) {
textView.setText(textView.getText().toString() + text);
}
2) Register a receiver between your Activity and BroadCastReceiver
3) Start your Activity with new Intent to update current open Activity
Intent intent = new Intent(context, MainActivity.class);
intent.putExtra("Key", "text");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
UPDATE :
explain method 2
MainActivity.class
in onResume()
registerReceiver(broadcastReceiver, new IntentFilter(SmsReceiver.BROADCAST_ACTION));
in onDestroy()
unregisterReceiver(broadcastReceiver);
local broadCast (broadcastReceiver, in MainActivity.class)
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
updateUI(intent);
}
};
private void updateUI(Intent intent) {
String text = intent.getStringExtra("key");
textView.setText(textView.getText().toString() + text);
}
SmsReceiver.class
global attribute
public static final String BROADCAST_ACTION = "your.package.name.displayevent";
private final Handler handler = new Handler();
Intent intent;
Context context;
in onReceive()
handler.removeCallbacks(sendUpdatesToUI);
handler.postDelayed(sendUpdatesToUI, 10);
this.context = context;//you can retrieve context from onReceive argument
this.intent = new Intent(BROADCAST_ACTION);
define two method
private Runnable sendUpdatesToUI = new Runnable() {
public void run() {
display();
}
};
private void display() {
intent.putExtra("key", text);
context.sendBroadcast(intent);
}

Modify your code as below.
public class SmsReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent)
{
Intent i = new Intent(context, MainActivity.class);
i.putExtra("updatedString","Hello"); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_SINGLE_TOP);
context.startActivity(i);
}
}
public class MainActivity extends Activity{
private TextView results;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bundle extras = getIntent().getExtras();
if(extras!=null){
results = (TextView) findViewById(R.id.results);
results.setVisibility(View.VISIBLE);
results.append(extras.getString("updatedString"));
}
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
//handle your intent here.Note this will be called even when activity first created.so becareful to handle intents correctly.
}
}

Stop service in an activity

I'm using following code to stop my service
Intent intent = new Intent(MainActivity.this, UsageRecorderService.class);
stopService(intent);
And this is my service that works indefinitely
public class UsageRecorderService extends IntentService {
public UsageRecorderService() {
super("UsageRecorder");
}
#Override
protected void onHandleIntent(Intent intent) {
while (true) {
UsageRecorder.recordUsages(this, false);
SystemClock.sleep(10000);
}
}
}
Why does not stop my service?

This code would work
public class UsageRecorderService extends IntentService {
private boolean mStop = false;
public UsageRecorderService() {
super("UsageRecorder");
}
public final Object sLock = new Object();
public void onDestroy() {
synchronized (sLock) {
mStop = true;
}
}
#Override
protected void onHandleIntent(Intent intent) {
while (true) {
synchronized (sLock) {
if (mStop) break;
}
UsageRecorder.recordUsages(this, false);
SystemClock.sleep(10000);
}
}
}
You can use stopService
Intent intent = new Intent(MainActivity.this, UsageRecorderService.class);
stopService(intent);
Also I recommend to read Services guide to understand what is going there.

Activity:
sendBroadcast(new Intent(ACTION_STOP));
IntentService
public class UsageRecorderService extends IntentService {
private static final String TAG = "UsageRecorderService";
String ACTION_STOP = "com.xxx.UsageRecorderService.ACTION_STOP";
boolean stop;
public UsageRecorderService() {
super("UsageRecorder");
}
private BroadcastReceiver receiver = new BroadcastReceiver() {
#Override public void onReceive(Context context, Intent intent) {
if (ACTION_STOP.equals(intent.getAction())) {
stop = true;
}
}
};
#Override public void onCreate() {
super.onCreate();
IntentFilter intentFilter = new IntentFilter(ACTION_STOP);
registerReceiver(receiver, intentFilter);
}
#Override
protected void onHandleIntent(Intent intent) {
Log.i(TAG,"onHandleIntent");
while (true && !stop) {
Log.i(TAG,"----running----");
//UsageRecorder.recordUsages(this, false);
SystemClock.sleep(10000);
}
}
#Override public void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
}

An IntentService is designed to stop itself only when all the requests present in the work queue have been handled.Android stops the service after all start requests have been handled.

My service stop after the back button

I have a service and an activity that communicate.
When I click the button(I have galaxy s3 there is only one button) then my activity of course disapear and my service is keep running but if I click the back (touch) button then my service is destroyed.
How can I change that?I want the service to keep running untill the activity destroys it.
EDIT
Here is the code:
Service:
public class MyService extends Service
{
private static final String TAG = "BroadcastService";
public static final String BROADCAST_ACTION = "com.websmithing.broadcasttest.displayevent";
private final Handler handler = new Handler();
private Intent intent;
int counter = 0;
#Override
public void onCreate()
{
super.onCreate();
intent = new Intent(BROADCAST_ACTION);
}
#Override
public void onStart(Intent intent, int startId)
{
// handler.removeCallbacks(sendUpdatesToUI);
handler.postDelayed(sendUpdatesToUI, 1000); // 1 second
}
private Runnable sendUpdatesToUI = new Runnable() {
public void run() {
DisplayLoggingInfo();
handler.postDelayed(this, 1000); // 10 seconds
}
};
private void DisplayLoggingInfo() {
intent.putExtra("counter", String.valueOf(++counter));
sendBroadcast(intent);
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onDestroy() {
handler.removeCallbacks(sendUpdatesToUI);
super.onDestroy();
}
}
Activity:
public class MainActivity extends Activity {
private static final String TAG = "BroadcastTest";
private Intent intent;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intent = new Intent(this, MyService.class);
startService(intent);
registerReceiver(broadcastReceiver, new IntentFilter(MyService.BROADCAST_ACTION));
}
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
updateUI(intent);
}
};
#Override
public void onDestroy() {
super.onPause();
unregisterReceiver(broadcastReceiver);
stopService(intent);
}
private void updateUI(Intent intent)
{
String counter = intent.getStringExtra("counter");
Log.d(TAG, counter);
TextView txtCounter = (TextView) findViewById(R.id.textView1);
txtCounter.setText(counter);
}
}

you can put your app in the background instead off finishing it.
#Override
public void onBackPressed() {
moveTaskToBack(true);
// super.onBackPressed();
}

Ofcourse your service stops, when you press the back button. The back button most calls finish() on the activity, and it is destroyed. When you press the other button (the home button), it just minimizes your app, and it will be only destroyed later, when the OS wants to free up space.
If you want to keep your service running, make it a foreground service, and dont stop it on activity destroy.

Start android activity from receiver (inside running service)

I want to display an alert when a sms is received, so my idea is to start a new activity that launch the alertdialog.
My service starts with no problem, and starts receiver as well..
I can receive sms and display toast alerts fine.. but i'd like to show a custom alertdialog instead.
This is the activity that starts my service (ServiceExampleActivity ):
public class ServiceExampleActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnStartService = (Button) findViewById(R.id.btnStart);
Button btnStopService = (Button) findViewById(R.id.btnStop);
btnStartService.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
StartMyService();
}
});
btnStopService.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
StopMyService();
}
});
}
private void StartMyService() {
Intent myServiceIntent = new Intent(this, ServiceTest.class);
startService(myServiceIntent);
}
private void StopMyService() {
Intent myServiceIntent = new Intent(this, ServiceTest.class);
stopService(myServiceIntent);
}
}
This is my Service (ServiceTest):
public class ServiceTest extends Service {
private static final String ACTION = "android.provider.Telephony.SMS_RECEIVED";
private BroadcastReceiver myBroadcastReceiver = null;
#Override
public void onCreate() {
super.onCreate();
final IntentFilter theFilter = new IntentFilter();
theFilter.addAction(ACTION);
this.myBroadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
StartDialogActivity(context, intent);
}
};
this.registerReceiver(myBroadcastReceiver, theFilter);
}
#Override
public IBinder onBind(Intent arg) {
return null;
}
#Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.d("ServiceTest", "Started");
Toast.makeText(this, "Service started...", 3000).show();
}
#Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(myBroadcastReceiver);
Toast.makeText(this, "Service destroyed...", 3000).show();
}
private void StartDialogActivity(Context context, Intent intent) {
Intent dlgIntent = new Intent(context, DialogActivity.class);
dlgIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(dlgIntent);
}
}
And this is the activity i want to launch to display the alertdialog normally..
public class DialogActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog);
}
}
When it tries to start the activity, the app crashes..
Can you tell me were is the error..??

Like this, you want start activity from service
Intent dlgIntent = new Intent(context, DialogActivity.class);
dlgIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplication().startActivity(dlgIntent );

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Android: cannot pass value from service to activity using putExtra and getLongExtra - android

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Running countdown timer faster when i back to activity

Sending Intent from BroadcastReceiver class to currently running activity

Stop service in an activity

My service stop after the back button

Start android activity from receiver (inside running service)

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