Android Call Waiting State

Question

Is there any state which can tell us that the line is connected and other person's phone is ringing. Like I want to know the state where proper connection is made and other person knows you are calling and can answer it?

I have tried this but it never goes in phone ringing state:

public void onReceive(final Context context, Intent intent) {
TelephonyManagerTm=(TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
        Tm.listen(new PhoneStateListener(){
            public void  onCallStateChanged(int state,String number) {
                super.onDataConnectionStateChanged(state);
                switch(state)
                {
                    case TelephonyManager.CALL_STATE_RINGING:
                        Toast.makeText(context, "Phone Ringing", 1).show();
                        break;
                    case TelephonyManager.CALL_STATE_OFFHOOK:

                        break;
                    case TelephonyManager.CALL_STATE_IDLE: 
                        Toast.makeText(context, "call rejected", 1).show();                 
                        break;
                }
            }
        },PhoneStateListener.LISTEN_CALL_STATE);

Answer 1

Even though there are only three states available in Android Telephony Manager, it is very easy to identify the waiting state of a new incoming call. And this algorithm will provide state for all situations in a phone call.

So here we are receiving the 3 events from android such as RINGING, OFFHOOK and IDLE. And in order to get the waiting state of a new incoming call, we need to define our own states like RINGING, OFFHOOK, IDLE, FIRST_CALL_RINGING, SECOND_CALL_RINGING.
Please think in a way that we are receiving events from android and we will define our on call states.

Here is the method to get call states at onReceive() of broadcast-receiver without registering PhoneStateListener and escaping from other complications. See the code.

public class CallListening  extends BroadcastReceiver {
    static CustomPhoneStateListener customPhoneListener;
    private static final String TAG ="broadcast_intent";
    public static String incoming_number;
    private String current_state,previus_state,event;
    public static Boolean dialog= false;
    private Context context;
    private SharedPreferences sp,sp1;
    private SharedPreferences.Editor spEditor,spEditor1;
    public void onReceive(Context context, Intent intent) {
        //Log.d("intent_log", "Intent" + intent);
        dialog=true;
        this.context = context;
        event = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
        incoming_number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
        Log.d(TAG, "The received event : "+event+", incoming_number : " + incoming_number);
        previus_state = getCallState(context);
        current_state = "IDLE";
        if(incoming_number!=null){
            updateIncomingNumber(incoming_number,context);
        }else {
            incoming_number=getIncomingNumber(context);
        }
        switch (event) {
            case "RINGING":
                Log.d(TAG, "State : Ringing, incoming_number : " + incoming_number);
            if((previus_state.equals("IDLE")) || (previus_state.equals("FIRST_CALL_RINGING"))){
                    current_state ="FIRST_CALL_RINGING";
                }
                if((previus_state.equals("OFFHOOK"))||(previus_state.equals("SECOND_CALL_RINGING"))){
                    current_state = "SECOND_CALL_RINGING";
                }

                break;
            case "OFFHOOK":
                Log.d(TAG, "State : offhook, incoming_number : " + incoming_number);
                if((previus_state.equals("IDLE")) ||(previus_state.equals("FIRST_CALL_RINGING")) || previus_state.equals("OFFHOOK")){
                    current_state = "OFFHOOK";
                }
                if(previus_state.equals("SECOND_CALL_RINGING")){
                    current_state ="OFFHOOK";
                    startDialog(context);
                }
                break;
            case "IDLE":
                Log.d(TAG, "State : idle and  incoming_number : " + incoming_number);
                if((previus_state.equals("OFFHOOK")) || (previus_state.equals("SECOND_CALL_RINGING")) || (previus_state.equals("IDLE"))){
                    current_state="IDLE";
                }
                if(previus_state.equals("FIRST_CALL_RINGING")){
                    current_state = "IDLE";
                    startDialog(context);
                }
                updateIncomingNumber("no_number",context);
                Log.d(TAG,"stored incoming number flushed");
                break;
        }
        if(!current_state.equals(previus_state)){
            Log.d(TAG, "Updating  state from "+previus_state +" to "+current_state);
            updateCallState(current_state,context);

        }
    }
    public void startDialog(Context context) {
        Log.d(TAG,"Starting Dialog box");
        Intent intent1 = new Intent(context, NotifyHangup.class);
        intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent1);

    }
    public void updateCallState(String state,Context context){
        sp = PreferenceManager.getDefaultSharedPreferences(context);
        spEditor = sp.edit();
        spEditor.putString("call_state", state);
        spEditor.commit();
        Log.d(TAG, "state updated");

    }
    public void updateIncomingNumber(String inc_num,Context context){
        sp = PreferenceManager.getDefaultSharedPreferences(context);
        spEditor = sp.edit();
        spEditor.putString("inc_num", inc_num);
        spEditor.commit();
        Log.d(TAG, "incoming number updated");
    }
    public String getCallState(Context context){
        sp1 = PreferenceManager.getDefaultSharedPreferences(context);
        String st =sp1.getString("call_state", "IDLE");
        Log.d(TAG,"get previous state as :"+st);
        return st;
    }
    public String getIncomingNumber(Context context){
        sp1 = PreferenceManager.getDefaultSharedPreferences(context);
        String st =sp1.getString("inc_num", "no_num");
        Log.d(TAG,"get incoming number as :"+st);
        return st;
    }
}

Answer 2

Yes we can get the state PhoneStateListener.

Whenever you extend a class from PhoneStateListener, you will get onCallStateChanged(), like below:

 public class CustomPhoneStateListener extends PhoneStateListener {

      ActivityManager activityManager;
      Intent i1;
      public CustomPhoneStateListener(Context context) {
          super();
          this.context = context;
          i1 = new Intent(context, TelephoneyWithoutToastActivity.class);
          i1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      }

      @Override
      public void onCallStateChanged(int state, String incomingNumber) {
          super.onCallStateChanged(state, incomingNumber);

          switch (state) {
          case TelephonyManager.CALL_STATE_IDLE:
              //when Idle i.e no call
              Toast.makeText(context, "Phone state Idle", Toast.LENGTH_LONG).show();

              break;
          case TelephonyManager.CALL_STATE_OFFHOOK:

              //when Off hook i.e in call
              //Make intent and start your service here
              Toast.makeText(context, "Phone state Off hook", Toast.LENGTH_LONG).show();

              break;
          case TelephonyManager.CALL_STATE_RINGING:

              ActivityManager localActivityManager = (ActivityManager) this.context.getSystemService("activity");
              for (String str = ((ActivityManager.RunningTaskInfo) localActivityManager.getRunningTasks(1).get(0)).topActivity.flattenToString();; str = ((ActivityManager.RunningTaskInfo) localActivityManager.getRunningTasks(1).get(0)).topActivity.flattenToString()) {
                  if ((!str.contains("com.android.phone.InCallScreen")))
                      continue;
                  Log.d("IncomingCallPlus", "*****************************************************");   
                  context.startActivity(i1);
                  return;
              }    

          default:
              break;
          }
      }    
  }

For reference check this.

Answer 3

There are 3 states: IDLE, RINGING, OFFHOOK.

For incoming calls the normal flow is:

• IDLE (start state),
• RINGING (the phone is ringing),
• OFFHOOK (the user picks up)

For outgoing calls the flow is:

• IDLE (start state),
• OFFHOOK (called only after the other person picks up)

There's no RINGING state for outgoing calls before they're picked up.