Why is my BroadCast Receiver not working?

Question

I am learning about BroadCast Receivers. What I am trying to achieve with the following piece of code is, I would like to see a toast when I switch to airplane mode, where the app is on or not. What am I not doing / Doing wrong? Please Help. Thanks

ConnectivityChangedReceiver.java class

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.Toast;

public class ConnectivityChangedReceiver extends BroadcastReceiver {

@Override
public void onReceive( Context context, Intent intent )
{
    Toast.makeText(context, "Intent Detected.", Toast.LENGTH_LONG).show();

}
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<uses-permission android:name="android.permission.SEND_SMS"/>
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <receiver android:name=".ConnectivityChangedReceiver">
        <intent-filter>
            <action android:name="android.intent.action.AIRPLANE_MODE">
            </action>
        </intent-filter>

    </receiver>

</application>

MainActivity.java`

 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.content.Intent;


 import java.util.ArrayList;

 public class MainActivity extends AppCompatActivity {

private TextView switchStatus;
private Switch mySwitch;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 }
 }

what you want to do whit this broadcast? start it after what? — Luiz Fernando Salvaterra, May 16 '17 at 16:59
After I switch to airplane mode, I would like to see the toast "Intent detected' — Moses Kirathe, May 16 '17 at 17:00

score 8 · Answer 1 · answered Oct 31 '18 at 14:21

From the android documentation :

https://developer.android.com/guide/components/broadcast-exceptions

As part of the Android 8.0 (API level 26) Background Execution Limits, apps that target the API level 26 or higher can no longer register broadcast receivers for implicit broadcasts in their manifest. However, several broadcasts are currently exempted from these limitations. Apps can continue to register listeners for the following broadcasts, no matter what API level the apps target.

and

https://developer.android.com/distribute/best-practices/develop/target-sdk

Google Play will require that new apps target at least Android 8.0 (API level 26) from August 1, 2018, and that app updates target Android 8.0 from November 1, 2018.

"android.intent.action.AIRPLANE_MODE" is no longer in the list of exempted broadcasts. So, register your broadcast receiver in activity rather than in AndroidManifest.

Thanks, @Abhishek for your answer. previously I was trying to use from manifest only and it took so much of my time. — amit pandya, Mar 28 '19 at 14:06

Avinash Roy · Answer 2 · 2017-05-16T17:39:02.663

1

Try it like this,try adding,android:exported="true":

//Add this permission too

<uses-permission android:name="android.permission.WRITE_SETTINGS" />


 <receiver android:enabled="true" android:name=".ConnectivityChangedReceiver"
android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.ACTION_AIRPLANE_MODE_CHANGED"/>
        </intent-filter>
    </receiver>

The Real state is determined like this:

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

        boolean isAirplaneModeOn = intent.getBooleanExtra("state", false);
        if(isAirplaneModeOn){

           // handle Airplane Mode on
        } else {
           // handle Airplane Mode off
        }
    }

edited May 16 '17 at 17:39

answered May 16 '17 at 17:05

Avinash Roy

988
1
8
25

Din't work. Tried with another broadcast, but it still won't work:-( – Moses Kirathe May 16 '17 at 17:12
Hi @Roy. I have added that but I am still not getting any response. Should I add anything to the MainActivity? What else could be wrong?:-( – Moses Kirathe May 16 '17 at 17:26
Try with this new action @Mos – Avinash Roy May 16 '17 at 17:32
@Mos put this permission and let me know if u can trigger the intent – Avinash Roy May 16 '17 at 17:39
Hi @Roy. I have found the problem, which was in the following line in the Manifest. I simply changed to – Moses Kirathe May 17 '17 at 14:19

score 1 · Answer 3 · answered May 16 '17 at 17:21

The Official document of Broadcast Receivers Says:

android:exported

Whether or not the broadcast receiver can receive messages from sources outside its application — "true" if it can, and "false" if not. If "false", the only messages the broadcast receiver can receive are those sent by components of the same application or applications with the same user ID.

score 1 · Accepted Answer · answered May 17 '17 at 14:22

1

So I just found the solution to my problem above. I changed

<receiver android:name=".ConnectivityChangedReceiver">

to

<receiver android:name="ConnectivityChangedReceiver">

(Without the '.' at the beginning of name. Hope it helps a stranded one!

answered May 17 '17 at 14:22

Moses Kirathe

302
1
3
14

and that should be written inside ANdroidManifest.xml? – gumuruh Jun 13 '20 at 07:02

score 0 · Answer 5 · answered May 16 '17 at 17:05

0

You have to enable your broadcast in your manifest.xml file :

<receiver android:enabled="true" android:name=". ConnectivityChangedReceiver">
    <intent-filter>
        <action android:name="android.intent.action.AIRPLANE_MODE"/>
    </intent-filter>
</receiver>

answered May 16 '17 at 17:05

Luiz Fernando Salvaterra

4,102
2
23
40

Din't work. Tried with another broadcast, but it still won't work – Moses Kirathe May 16 '17 at 17:12

score 0 · Answer 6 · answered Oct 19 '18 at 21:06

You need to put the receiver in the bundles package:

package my.bundles.id;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.Toast;

public class ConnectivityChangedReceiver extends BroadcastReceiver {

@Override
public void onReceive( Context context, Intent intent )
{
    Toast.makeText(context, "Intent Detected.", Toast.LENGTH_LONG).show();

}
}

You should put it in a package thats the same as the bundleId and that will let the above work. The first dot in the name field means that the Class is a member of the bundles namespace. So, since it wasnt in a package, the dot made it look in the wrong place.

score 0 · Answer 7 · answered Apr 10 '22 at 22:33

if you API level greater than 26 you should add permission to your code like that:

super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
   
val _receiver = cSmsListener() //<--you BroadCastreciever class 
val intentFilter = IntentFilter()

intentFilter.addAction(Telephony.Sms.Intents.SMS_RECEIVED_ACTION)
getApplicationContext().registerReceiver(_receiver, intentFilter);

var myPermission: Array<String> = arrayOf(Manifest.permission.RECEIVE_SMS, Manifest.permission.READ_SMS)
ActivityCompat.requestPermissions(this, myPermission,1)

Why is my BroadCast Receiver not working?

7 Answers7

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