How to pass the incoming message in to another activity?

Question

My application is receiving an Message in string form and i want it to pass in Map Activity to get the location. Basically the incoming message will be Long,Latitudes. But it always gives me an error NullPointerException

enter code here
package biketracker1.com.biketracker;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;


public  class FirstActivity extends Activity {

private String latitudes;
private Button send;
private Button send2;
private Button send3;
private Button maps;
BroadcastReceiver reciever;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.firstactivity);
    send = (Button) findViewById(R.id.send);
    send2 = (Button) findViewById(R.id.send2);
    send3 = (Button) findViewById(R.id.send3);
    maps = (Button) findViewById(R.id.map);
    sendMessageOne();

    IntentFilter filter = new IntentFilter();
    filter.addAction("android.provider.Telephony.SMS_RECEIVED");
    filter.setPriority(2147483647);

    BroadcastReceiver receiver = new SmsReceiver();
    registerReceiver(receiver, filter);
}
private void sendMessageOne() {

    maps.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
       String value= "31.5546,74.3572";
            Intent i = new Intent(FirstActivity.this,MapsActivity.class);
            i.putExtra("messages",value );
            startActivity(i);
        }
    });

    send3.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v) {
            SmsManager manager = SmsManager.getDefault();
            manager.sendTextMessage("Number",null,"3",null,null);

        }
    });
    send2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            SmsManager manager = SmsManager.getDefault();
            manager.sendTextMessage("Number",null,"2",null,null);
        }
    });
    send.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            SmsManager manager = SmsManager.getDefault();
            manager.sendTextMessage("Number",null,"1",null,null);

        }
    });
}
}

Code in My Broadcast Receiver :

package biketracker1.com.biketracker;
import android.content.BroadcastReceiver;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.util.Log;
public class SmsReceiver extends BroadcastReceiver{
Context context;
private String latitudes;
@Override
public void onReceive(Context context, Intent intent)
{
Log.e("ABC", "** good");
if
(intent.getAction().equalsIgnoreCase
("android.provider.Telephony.SMS_RECEIVED))  


{
    Bundle bundle = intent.getExtras();
    if (bundle != null)``
    {
        Object[] pdus = (Object[]) bundle.get("pdus");
        final SmsMessage[] messages = new SmsMessage[pdus.length];
        for (int i = 0; i < pdus.length; i++)
        {
            messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
        }`if (messages.length > -1)
        {Log.e("ABC",messages[0].getMessageBody().toString());
           // Toast.makeText(context, "SMS Message content" +messages, Toast.LENGTH_LONG).show();
        Intent j = new Intent(context,MapsActivity.class);
            j.putExtra("messages",latitudes);
         context.startActivity(j);
        }
    }
}
}
}

Code in my Activity:

package biketracker1.com.biketracker;


import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
 private GoogleMap mMap;
 private String getLangs;
 private String [] getValues;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
Intent intent = getIntent();

getLangs = intent.getExtras().getString("messages");
getValues = getLangs.split(",");

SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
        .findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
 }


 @Override
 public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;

LatLng sydney = new LatLng(Double.parseDouble(getValues[0]),Double.parseDouble(getValues[1]));

mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Lahore"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
  }

Logcat

05-19 10:03:34.17530034-30034/biketracker1.com.biketracker E/ABC: 31.437250,74.259407 05-19 10:03:35.213 30034-30034/biketracker1.com.biketracker E/AndroidRuntime: FATAL EXCEPTION: main Process: biketracker1.com.biketracker, PID: 30034 java.lang.RuntimeException: Unable to start activity ComponentInfo{biketracker1.com.biketracker/biketracker1.com.biketracker.MapsActivity}: java.lang.NullPointerException: println needs a message at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2393) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5351) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703) Caused by: java.lang.NullPointerException: println needs a message at android.util.Log.println_native(Native Method) at android.util.Log.d(Log.java:139) at biketracker1.com.biketracker.MapsActivity.onCreate(MapsActivity.java:28) at android.app.Activity.performCreate(Activity.java:6020) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2284) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2393) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5351) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)

Use `broadcast receiver` for updating activity. [http://stackoverflow.com/questions/25215878/how-to-update-the-ui-of-activity-from-broadcastreceiver] — Sohail Zahid, May 19 '16 at 04:34
Attempt to invoke virtual method 'java.lang.String[] java.lang.String.split(java.lang.String)' on a null object reference – — Danny, May 19 '16 at 04:40
Latitude variable is null.Please initialize it thats why you are getting NullpointerException — akhil Rao, May 19 '16 at 04:41
Print a log.. like this `Log.d("message",getLangs);` just below your line `getLangs = intent.getExtras().getString("messages");`. so that you will get the actual value which is in your message..!! see what gets print in logcat..!! — Janki Gadhiya, May 19 '16 at 04:49
i don't want you to initialize.. i know it's coming from a SMS. I am just saying to print it.. and see what is the message..!!! — Janki Gadhiya, May 19 '16 at 04:53
@jankigadhiya check the Logcat. In the first line app is receiving the coordinates. Then still same error. Please help me to fix it — Danny, May 19 '16 at 05:22

score 0 · Accepted Answer · answered May 19 '16 at 05:24

Just change you Broadcast receiver code like this :

@Override
public void onReceive(Context context, Intent intent)
{
Log.e("ABC", "** good");
if
(intent.getAction().equalsIgnoreCase
("android.provider.Telephony.SMS_RECEIVED))  


{
    Bundle bundle = intent.getExtras();
    if (bundle != null)``
    {
        Object[] pdus = (Object[]) bundle.get("pdus");
        final SmsMessage[] messages = new SmsMessage[pdus.length];
        for (int i = 0; i < pdus.length; i++)
        {
            messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
        }
        if (messages.length > -1)
        {
            Log.e("ABC",messages[0].getMessageBody().toString());
            latitudes = messages[0].getMessageBody().toString();
            Intent j = new Intent(context,MapsActivity.class);
            j.putExtra("messages",latitudes);
         context.startActivity(j);
        }
    }
}
}
}

debug and see if You are receiving the message or not?? if Yes is it coming to your `messages` ?? — Janki Gadhiya, May 19 '16 at 06:01
debug in your `onReceive()`..!! I think you are not getting the message in `onReceive()` — Janki Gadhiya, May 19 '16 at 06:11

How to pass the incoming message in to another activity?

1 Answers1