How to Block Incoming Call in Android P (API 28)

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Mike

8/6/2019, 1:03:07 PM

I am developing an android app to block the incoming calls. Till API 27 (OREO MR1), I have used the reflection method (iTelephony) to block the incoming calls. But in Android Pie, reflections are deprecated. So the iTelephony method is not working in Android P version. Is there any working method to block incoming call in API >= 28.

3 Replies

Legacy User 1

8/6/2019, 1:13:43 PM

In Android Pie, there is an official way to block the incoming calls using endcall() function in TelecomManager,

https://developer.android.com/reference/android/telecom/TelecomManager#endCall()

To use this function you need ANSWER_PHONE_CALLS permission. This is categorized as dangerous permission, so you need to request this permission during runtime instead of adding in manifest file.

if (checkSelfPermission(Manifest.permission.ANSWER_PHONE_CALLS) == PackageManager.PERMISSION_GRANTED) {
TelecomManager tcm = (TelecomManager) context.getSystemService(Context.TELECOM_SERVICE);
if (tcm != null) {
try {
if (incomingCallNumber != null) {
tcm.endCall();
Log.d(TAG, "Incoming Call Blocked " + incomingCallNumber);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

EDIT: endcall() function is deprecated in Android Q (API 29), so you can use this method only in Android Pie (API 28).

Leo

4/30/2022, 3:19:12 AM

My APP compile targetSdkVersion 22, In order to avoid dynamic application permissions，In order to avoid dynamically applying for permissions, but I cannot use endcall, the system prompts that there is no permission

android.permission.ANSWER_PHONE_CALLS

Legacy User 1

4/30/2022, 8:43:15 AM

For the Android version less then or equal to 27, use the below code

iTelephony.java

public interface ITelephony { boolean endCall(); void answerRingingCall(); void silenceRinger(); }

CallBlocker.java

    ITelephony telephonyService;
    TelephonyManager telephony;

                if (Build.VERSION.SDK\_INT <= 27) {
                    TelephonyManager tpm = (TelephonyManager) context.getSystemService(Context.TELEPHONY\_SERVICE);
                    if (tpm != null) {
                        try {
                            Method m = tpm.getClass().getDeclaredMethod("getITelephony");
                            m.setAccessible(true);
                            telephonyService = (ITelephony) m.invoke(tpm);
                            if (incomingNumber != null && incomingNumbersList.contains(incomingNumber)) {
                                telephonyService.silenceRinger();
                                telephonyService.endCall();
                                Log.d(TAG, "Incoming Call Ended " + incomingNumber);
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }