Can an activity receive an unordered broadcast(incoming call) intent before system's default receiver?

Question

Here is the scenario :

An activity is displayed(active). If a phone call comes, the activity should receive the intent (send the \"incoming call screen\" to the back

Answer 1

This is how I solved it :

Manifest.xml

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
...
<receiver android:name=".MyPhoneBroadcastReceiver">
<intent-filter android:priority="99999">
    <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

<activity android:name=".LockScreenActivity" android:noHistory="true" android:label="@string/app_name" >
    <intent-filter>
        <action android:name="android.intent.action.ANSWER" />
         <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>    
 </activity>

MyPhoneBroadcastReceiver.java

public void onReceive(final Context context, Intent intent) {
    Bundle extras = intent.getExtras();
    ...
    if (extras != null) {
    String state = extras.getString(TelephonyManager.EXTRA_STATE);

     if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
             new Handler().postDelayed(new Runnable() {
          public void run() {
              Intent intentPhoneCall = new Intent("android.intent.action.ANSWER");
                      intentPhoneCall.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          context.startActivity(intentPhoneCall);
                  }
             }, 100);
         }
    }
}

LockScreenActivity.java - A regular activity class with UI that shows up saying your screen is locked. It covers 100% area of your screen i.e. no navigation/status bar. Also the HOME/MENU keys have been disabled. This is how I achieved that : How can I detect user pressing HOME key in my activity?

P.S. : The trick is not the main logic but a 100ms delay. Without it your custom(home) lock screen will be removed by the system default incoming call screen everytime you get a call on the phone!

Answer 2

Ya sanjana is right that code works for me.. but instead of giving postdelay 100msec give more then 1.5 sec.. Bcoz to start incoming screen needs 800 to 1000msec.. I copied her code only but modified a bit.. Try this works fine...

@Override
public void onReceive(final Context context, Intent intent) {

    Bundle extras = intent.getExtras();

    if (extras != null) {
        String state = extras.getString(TelephonyManager.EXTRA_STATE);
        final String incomingNumber = extras.getString("incoming_number");

        Handler callActionHandler = new Handler();

        Runnable runRingingActivity = new Runnable() {

            @Override
            public void run() {
                Intent intentPhoneCall = new Intent("android.intent.action.ANSWER");
                intentPhoneCall.putExtra("INCOMING_NUM", incomingNumber);
                intentPhoneCall.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intentPhoneCall);
            }
        };

        if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
            callActionHandler.postDelayed(runRingingActivity, 2000);

        }

        if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)) {
            callActionHandler.removeCallbacks(runRingingActivity);
            // setResultCode(Activity.RESULT_CANCELED);
        }

    }
}

Then use PhoneStateListener at receiver class side.. I used like this....

/*********** My receiver class onCreate() contains ************/
TelephonyManager telephony = (TelephonyManager)    
getSystemService(getApplicationContext().TELEPHONY_SERVICE);
        telephony.listen(myListener, PhoneStateListener.LISTEN_CALL_STATE);

class MyPhoneStateListener extends PhoneStateListener {

     Activity curActivity;

     public MyPhoneStateListener(Activity _curActivity){
         this.curActivity = _curActivity;

     }

        public void onCallStateChanged(int state, String incomingNumber) {
            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                Log.i("TEST APP", "Cal End");                   
                curActivity.finish();                   
                break;

            case TelephonyManager.CALL_STATE_OFFHOOK:
                Log.i("TEST APP", "Hello");                 
                break;

            case TelephonyManager.CALL_STATE_RINGING:
                Log.i("TEST APP", "Calling...");

                break;
            }

        }
    }