ANDROID - How to access another class from a different Class?

Question

I have a MapView.java wherein it requests for SMS permission, Location permission etc. I created a new Java class for the SMSReceiver, which extends BroadcastReceiver and has an onReceive method.

The problem is, I am struggling with how I will call the SMSReceiver class to my MapView.Java. Can anyone help me?

You just have to register your SMSReceiver in your MapView class. See https://developer.android.com/guide/components/broadcasts — Maxouille, Mar 12 '19 at 10:53

Vijay Singh Chouhan · Answer 1 · 2019-03-13T07:02:12.780

0

Try this out.

Hope it will help!

registerReceiver(mySMSBroadcastReceiver, new IntentFilter(SmsRetriever.SMS_RETRIEVED_ACTION));

edited Mar 13 '19 at 07:02

answered Mar 12 '19 at 10:55

Vijay Singh Chouhan

285
2
17

It says "Unable to start activity ComponentInfo" – lolo mo Mar 12 '19 at 11:18
Provide full log. – Vijay Singh Chouhan Mar 12 '19 at 11:20
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.coni, PID: 1081 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.coni/com.example.sample.MapView}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.View.getContext()' on a null object reference at com.example.coni.MapView.onCreate(MapView.java:127) – lolo mo Mar 12 '19 at 11:43
For clarification, I declared View view on MapView class. Is that right? – lolo mo Mar 12 '19 at 11:48
I need to see class. – Vijay Singh Chouhan Mar 12 '19 at 11:50
I commented the MapView class below. – lolo mo Mar 12 '19 at 11:53
– lolo mo Mar 12 '19 at 12:02
Is that the proper way of declaring the receiver to the manifest? Sorry Sir, I am new to Android programming. Thank you for your time. – lolo mo Mar 12 '19 at 12:03
registerReceiver(mySMSBroadcastReceiver, new IntentFilter(SmsRetriever.SMS_RETRIEVED_ACTION)); try it out – Vijay Singh Chouhan Mar 12 '19 at 13:12
Thank you. Figured it out. :) – lolo mo Mar 12 '19 at 14:02

ANDROID - How to access another class from a different Class?

1 Answers1