Develop Reference

Bluetooth Server and BroadCastReceiver

My application holds an open bluetooth server socket with a specific UUID, in order for another device to connect and transfer files. I'm a bit confused regarding the BroadcastReceiver.
In my class which extends Activity, I want to check the state of the bluetooth adapter. But my BroadcastReceiver is never triggered. I tried using the BroadcastReceiver this way:
public class MainClass extends Activity {
public void onCreate(Bundle b) {
super.onCreate(b);
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mReceiver, filter);
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
Log.w("BroadcastReceiver: ", "Inside!");
if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
switch (state) {
case BluetoothAdapter.STATE_OFF:
Log.d("Bluetooth Receiver", "State-off");
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
break;
case BluetoothAdapter.STATE_TURNING_OFF:
Log.d("Bluetooth Receiver", "State turning off");
break;
case BluetoothAdapter.STATE_ON:
Log.d("Bluetooth Receiver", "State-on");
btCom = new BluetoothCommunicator(MainClass.this, lastCases, nist);
btCom.startServer();
break;
case BluetoothAdapter.STATE_TURNING_ON:
Log.d("Bluetooth Receiver", "State turning on");
break;
}
}
}
};
}
I have a question regarding the states:
The state STATE_ON is this only fired off when the bluetooth is turned on during runtime? Or can I start my application with bluetooth turned on, and this event will be fired off? Cause I want to start the method btCom.startServer() if bluetooth is turned on
I also read that I need to register the broadcast receiver in my Manifest file, how can I do so if the BroadcastReceiver is in a class which extends Activity? If I had this BroadcastReceiver in a separate class I would do it like this
Say for instace that my Package Name was com.workbench and my Class name was BluetoothReceiver
The Manifest would look something like this:
<receiver android:name="com.workbench.BluetoothReceiver"></receiver>

The broadcast action BluetoothAdapter.ACTION_STATE_CHANGED is sent when the state of the bluetooth adapter changes. You will only see this when the state of the adapter is changed.
You can check the current state of the bluetooth adapter by calling BluetoothAdapter.isEnabled().
You only need to register the BroadcastReceiver in your manifest if you want to get the broadcast Intent when your application is not running. The way you have implemented the BroadcastReceiver (as an anonymous class) it isn't possible to register it in the manifest.

Cannot detect when outgoing call is answered in Android

To detect when an outgoing call is answered, I tried creating a PhoneStateListener and listening for TelephonyManager's CALL_STATE_RINGING, CALL_STATE_OFFHOOK, and CALL_STATE_IDLE, from this question, but it does not seem to work, as explained below.
First, I registered the following permission in the manifest:
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
Then, a BroadcastReceiver called OutCallLogger that catches the NEW_OUTGOING_CALL event whenever an outgoing call is made:
<receiver android:name=".listener.OutCallLogger">
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter>
</receiver>
Next, my implementation of OutCallLogger. I set up a boolean called noCallListenerYet to avoid attaching a new PhoneStateListener to the TelephonyManager whenever onReceive() is invoked.
public class OutCallLogger extends BroadcastReceiver {
private static boolean noCallListenerYet = true;
#Override
public void onReceive(final Context context, Intent intent) {
number = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
if (noCallListenerYet) {
final TelephonyManager tm = (TelephonyManager) context.getSystemService(
Context.TELEPHONY_SERVICE);
tm.listen(new PhoneStateListener() {
#Override
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
Log.d(This.LOG_TAG, "RINGING");
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Log.d(This.LOG_TAG, "OFFHOOK");
break;
case TelephonyManager.CALL_STATE_IDLE:
Log.d(This.LOG_TAG, "IDLE");
break;
default:
Log.d(This.LOG_TAG, "Default: " + state);
break;
}
}
}, PhoneStateListener.LISTEN_CALL_STATE);
noCallListenerYet = false;
}
}
}
Now, when I make an outgoing call in my device, CALL_STATE_RINGING is NEVER invoked. I always only get printouts of "IDLE" to "OFFHOOK" when the other line starts ringing, nothing when the call is answered, and a printout of "IDLE" again when the call is ended.
How can I reliably detect when an outgoing call is answered in Android, or is that even possible?

Since Android 5.0 this is possible for system apps. But you need to use the hidden Android API.
I got it to work like this:
<uses-permission android:name="android.permission.READ_PRECISE_PHONE_STATE" />
<receiver android:name=".listener.OutCallLogger">
<intent-filter>
<action android:name="android.intent.action.PRECISE_CALL_STATE" />
</intent-filter>
</receiver>
public class OutCallLogger extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
switch (intent.getIntExtra(TelephonyManager.EXTRA_FOREGROUND_CALL_STATE, -2) {
case PreciseCallState.PRECISE_CALL_STATE_IDLE:
Log.d(This.LOG_TAG, "IDLE");
break;
case PreciseCallState.PRECISE_CALL_STATE_DIALING:
Log.d(This.LOG_TAG, "DIALING");
break;
case PreciseCallState.PRECISE_CALL_STATE_ALERTING:
Log.d(This.LOG_TAG, "ALERTING");
break;
case PreciseCallState.PRECISE_CALL_STATE_ACTIVE:
Log.d(This.LOG_TAG, "ACTIVE");
break;
}
}
}
You can find all possible call states in PreciseCallState.java and all extras that the intent contains in TelephonyRegistry.java.

It looks like the RINGING state is reached only by incoming calls. Outgoing calls change from IDLE to OFFHOOK, so looking at the Phone State maybe is not possible to achieve this.
I think that it could be possible using internal functions, look at this: What does the different Call states in the Android telephony stack represent?

Maybe try to use CallManager? Check out http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3.3_r1/com/android/internal/telephony/CallManager.java. I also found CallManager.java among the SDK files on my computer. The following text from the linked page seems promising:
Register for getting notifications for change in the Call State Call.State This is
called PreciseCallState because the call state is more precise than the Phone.State
which can be obtained using the android.telephony.PhoneStateListener Resulting events
will have an AsyncResult in Message.obj. AsyncResult.userData will be set to the obj
argument here. The h parameter is held only by a weak reference.
1051
1052 public void registerForPreciseCallStateChanged(Handler h, int what, Object obj){
1053 mPreciseCallStateRegistrants.addUnique(h, what, obj);
1054 }
I haven't tried to code anything, so really don't know if it can do what you want, but I am curious to know.

Please pay your attention at:
tm.listen(new PhoneStateListener() {
#Override
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
Log.d(This.LOG_TAG, "RINGING");
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Log.d(This.LOG_TAG, "OFFHOOK");
break;
case TelephonyManager.CALL_STATE_IDLE:
Log.d(This.LOG_TAG, "IDLE");
break;
default:
Log.d(This.LOG_TAG, "Default: " + state);
break;
}
}
}, PhoneStateListener.LISTEN_CALL_STATE);
Do you see "incomingNumber" argument? Yes, that code just can only detect your phone-call-state when there is an incoming-phone-call to your device.

You could do the following... not very precise but could do the trick:
You use the receiver for the android.intent.action.NEW_OUTGOING_CALL action
When the receiver is called you store somewhere (for instance a static var) the NEW_OUTGOIN_CALL state and the time in ms when this happened (i.e. new Date().getTime())
You use the another receiver for android.intent.action.PHONE_STATE and in the onReceive you do the following:
if (intent.getAction().equals("android.intent.action.PHONE_STATE")) {
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
telephony.listen(new PhoneStateListener() {
public void onCallStateChanged(int state, String incomingNumber) {
switch(state) {
case TelephonyManager.CALL_STATE_IDLE:
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
break;
case TelephonyManager.CALL_STATE_RINGING:
break;
}
}
}, PhoneStateListener.LISTEN_CALL_STATE);
}
In the CALL_STATE_OFFHOOK case you check that the last stored state was NEW_OUTGOING_CALL and that the no more than aprox. 10 seconds have passed since the last state change. This means that the phone initiated a call at most 10 seconds ago and that now he is in the offhook state (meaning active call) without passing through idle or ringing. This could mean that the call was answered.

Here your answer is that you have implemented CallStateListener in OutGoingCallReceiver which is wrong. You have to implement CallStateListener in PhoneStateListener
I have also tried this thing in my earlier project, I had faced the same issue, then I solved it like as below. I took 3 classes as below.
AutoCallReceiver: Register the TelephonyManager with PhoneStateListener.LISTEN_CALL_STATE
CallStateListener which listens three states as TelephonyManager.CALL_STATE_IDLE,TelephonyManager.CALL_STATE_OFFHOOK,TelephonyManager.CALL_STATE_RINGING
3.OutGoingCallReceiver which handles out going call
public class OutGoingCallReceiver extends BroadcastReceiver {
/* onReceive will execute on out going call */
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "OutGoingCallReceiver", Toast.LENGTH_SHORT).show();
}
}
public class CallStateListener extends PhoneStateListener {
String number=""; // variable for storing incoming/outgoing number
Context mContext; // Application Context
//Constructor that will accept Application context as argument
public CallStateListener(Context context) {
mContext=context;
}
// This function will automatically invoke when call state changed
public void onCallStateChanged(int state,String incomingNumber)
{
boolean end_call_state=false; // this variable when true indicate that call is disconnected
switch(state) {
case TelephonyManager.CALL_STATE_IDLE:
// Handling Call disconnect state after incoming/outgoing call
Toast.makeText(mContext, "idle", Toast.LENGTH_SHORT).show();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
// Handling outgoing call
Toast.makeText(mContext, "OFFHOOK", Toast.LENGTH_SHORT).show();
// saving outgoing call state so that after disconnect idle state can act accordingly
break;
case TelephonyManager.CALL_STATE_RINGING:
Toast.makeText(mContext, "RINGING", Toast.LENGTH_SHORT).show();
break;
}
}
}
public class AutoCallReceiver extends BroadcastReceiver {
/* onReceive will execute on call state change */
#Override
public void onReceive(Context context, Intent intent) {
// Instantiating PhoneStateListener
CallStateListener phoneListener=new CallStateListener(context);
// Instantiating TelephonyManager
TelephonyManager telephony = (TelephonyManager)
context.getSystemService(Context.TELEPHONY_SERVICE);
// Registering the telephony to listen CALL STATE change
telephony.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
}
}
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
<application ...>
<receiver android:name=".OutGoingCallReceiver">
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter>
</receiver>
<receiver android:name=".AutoCallReceiver">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
</application>

Android User Inter Action with phone

I want to know if a user silent or unsilent the phone. How to detect user interaction with phone volume if user unsilent the phone my function will trigger
Thanks In Advance

You can detect whether the phone is in silent mode or not by using getRingerMode() method in AudioManager.
AudioManager mAudio = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
switch (mAudio.getRingerMode()) {
case AudioManager.RINGER_MODE_SILENT:
// your phone is in Silent Mode
break;
case AudioManager.RINGER_MODE_VIBRATE:
// your phone is in Vibrate Mode
break;
case AudioManager.RINGER_MODE_NORMAL:
// your phone is in Normal Mode
break;
}
Apply your logic with this code to determine when the mode of the phone gets changed and call your function accordingly.
EDIT : To detect change in the ringer mode, declare a RingerModeStateChangeReceiver which extends BroadcastReceiver and use this code inside onCreate() method of your Activity or Service that you want to process the broadcast:
BroadcastReceiver receiver=new BroadcastReceiver(){
#Override
public void onReceive(Context context, Intent intent) {
//call your function here
}
};
IntentFilter filter=new IntentFilter(
AudioManager.RINGER_MODE_CHANGED_ACTION);
registerReceiver(receiver,filter);

Android, Handling incoming call event

I am developing an application which has a countdown timer. I want to pause that timer only if there is an incoming call on the phone. Is there any way to fire an event whenever we receive a call?

I think you should extends PhoneStateListener class.In that class you handle the phone state.For that use the permission in the manifest file for handling phone state (i.e. <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE">).
And use TelephonyManager to get the status of phone.
TelephonyManager manager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
manager.listen(this, LISTEN_CALL_STATE); // Registers a listener object to receive notification of changes in specified telephony states.
And override this method.
#Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch (state) {
case TelephonyManager.CALL_STATE_OFFHOOK:
case TelephonyManager.CALL_STATE_RINGING:
// Here you can perform your task while phone is ringing.
break;
case TelephonyManager.CALL_STATE_IDLE:
break;
}
}

When a Phone-Call is received OS fires a Message, technically called Broadcast.
Any Application can view/Respond to this message via Registering for PhoneIntentReceiver,
if more than one Application installed has registered for this, then all of them are given a chance to view this message based on Priority.
You can register for PhoneIntentReceiver via Manifest or Programatically. In both case you specify a Class that extends broadcast receiver in your project, that will receive a callback on detecting an Incoming call.
Then in this class the control is passed on to onReceive method. Its here that you can Stop your Timmer.
This is the story behind it.Happy Coding.

You have to write the Broadcast receiver which listens for incoming call
see this link for more info...

you have to use broadcast receiver for that........
First of all register your receiver in manifest.xml
<receiver android:name="com.cygnet.phonefinder.receiver.PhoneIntentReceiver" >
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
then you have to handle that reciever in
public class PhoneIntentReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) { } }

I would say the best implementation would be to utilize time stamps, timers (java.util.Timer or android.app.AlarmManager), and then listen for phone events using a broadcast receiver.
Basically every time you need to start an alarm for a certain period of time store a timestamp for the start of that alarm(probably easiest in an sql db) and then start the timer/alarm. When an alarm goes off make sure to clean up your stored timestamps.
Make sure to listen to phone state changes and on a phone call answered change clear all your alarms/timers and record the stop dates along with the previous timestamps and then when the phone call ends (from your reciever event) restart the timers/alarms for the remaining time.

In your Broadcastreceiver onReceive() write following code
Don't forget to give appropriate permission
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
MyCallStateListener customPhoneListener = new MyCallStateListener();
telephony.listen(customPhoneListener, PhoneStateListener.LISTEN_CALL_STATE);
if (!intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(TelephonyManager.EXTRA_STATE_OFFHOOK))
return;
public class MyCallStateListener extends PhoneStateListener {
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
break;
}
}
}

public class OutgoingCallReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "My Toast", Toast.LENGTH_LONG).show();
}
}
Try This receiver to fire an event

Detecting outgoing call and call hangup event in android

I have a requirement wherein I want to detect two kind of events related to Calls in Android
Whenever an outgoing call is made, my application should get to know this along with the called number
When the call is hanged up(due to success/failure), my application should get to know this along with the reason of hangup
Is this possible in Android?

You should create a BroadcastReceiver:
public class CallReciever extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
TelephonyManager.EXTRA_STATE_RINGING)) {
// Phone number
String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
// Ringing state
// This code will execute when the phone has an incoming call
} else if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
TelephonyManager.EXTRA_STATE_IDLE)
|| intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
TelephonyManager.EXTRA_STATE_OFFHOOK)) {
// This code will execute when the call is answered or disconnected
}
}
}
You should register you application to listen to these intents in the manifest:
<receiver android:name=".CallReciever" >
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>

There is a simpler solution using only TelephonyManager and
PhoneStateListener.You don´t even have to register a BroadcastReceiver.
public class MyPhoneStateListener extends PhoneStateListener {
#Override
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
//Hangup
case TelephonyManager.CALL_STATE_IDLE:
break;
//Outgoing
case TelephonyManager.CALL_STATE_OFFHOOK:
break;
//Incoming
case TelephonyManager.CALL_STATE_RINGING:
break;
}
}
}
And to register it:
public static void registerListener(Context context) {
((TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE)).listen(new MyPhoneStateListener(),
PhoneStateListener.LISTEN_CALL_STATE);
}

You need to create a receiver for the following intent actions:
Outgoing call - ACTION_NEW_OUTGOING_CALL
Call hangup - ACTION_PHONE_STATE_CHANGED