basic screening service watch unknown number call

app/src/main/java/com/bshield/caller/ScreeningService.kt

@@ -0,0 +1,29 @@
+package com.bshield.caller
+
+import android.telecom.Call
+import android.telecom.CallScreeningService
+import android.util.Log
+
+class ScreeningService : CallScreeningService() {
+    fun isBlocked(phone: String): Boolean {
+        Log.d("scamblock", "check phone " + phone);
+        return false;
+    }
+
+    override fun onScreenCall(callDetails: Call.Details) {
+        val callResponseBuilder = CallResponse.Builder()
+
+        // Make sure to remove the tel prefix and extract the phone number
+        val phoneNumber = callDetails.handle.toString()
+
+        if (isBlocked(phoneNumber)) {
+            callResponseBuilder.apply {
+                setRejectCall(true)
+                setDisallowCall(true)
+                setSkipCallLog(false)
+            }
+        }
+
+        respondToCall(callDetails, CallResponse.Builder().build())
+    }
+}