Broadcast Receiver not receiving intent from another app in android 11

Question

I am trying to send broadcast from App A to App B on Android 11.

Here is the receiver App B:
Manifest:

<receiver android:name="com.example.my_test.TestReceiver"
    android:enabled="true"
    android:permission="com.example.my_test.broadcast_permission">
    <intent-filter>
        <action android:name="com.example.my_test.receive_action"/>
        <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>
</receiver>

Receiver class:

class TestReceiver: BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        Log.d("MY_TAG", "received: ${intent?.getIntExtra("data", 0)}")
    }
}

Here is sender App A:
Manifest:

<uses-permission android:name="com.example.my_test.broadcast_permission"/>
...
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

Sender code (inside MainActivity):

findViewById<Button>(R.id.button).setOnClickListener {
    val intent = Intent("com.example.my_test.receive_action")
    intent.addCategory("android.intent.category.DEFAULT")
    intent.component = ComponentName("com.example.my_test", "com.example.my_test.TestReceiver")
    intent.putExtra("data", 69)
    intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES)
    sendBroadcast(intent, "com.example.my_test.broadcast_permission")
}

This is everything I have tried so far. Also not sure if anything regarding broadcast permission is wrong here. Nothing works, the TestReceiver class never logs anything.

I have also tried with android:exported="true"

If anyone knows where I am making a mistake, kindly help. If not possible, is there any other way to pass data from one app to another? Thanks.

Answer 1

Solved. Here are some points:

1. In App B (receiver), the permission needs to be also declared on top of the manifest, in <permission> tag. I missed this one.
2. Category is not necessary. Also no need to declare the permission inside sendBroadcast()
3. <uses-permission> in App A (sender) is necessary.
4. ComponentName or package name (using setPackage()) needs to be mentioned in Android 11.

Here's the corrected code:

Here is the receiver App B:
Manifest:

<permission android:name="com.example.my_test.broadcast_permission"/>
...
    <application>
    ...
        <receiver android:name="com.example.my_test.TestReceiver"
            android:permission="com.example.my_test.broadcast_permission">
            <intent-filter>
                <action android:name="com.example.my_test.receive_action"/>
            </intent-filter>
        </receiver>
    ...
    </application>
...

Receiver class: No change.

Here is sender App A:

Manifest: No change

Sender code (inside MainActivity):

findViewById<Button>(R.id.button).setOnClickListener {
    val intent = Intent("com.example.my_test.receive_action")
    intent.component = ComponentName("com.example.my_test", "com.example.my_test.TestReceiver")
    // if exact receiver class name is unknown, you can use:
    // intent.setPackage("com.example.my_test")
    intent.putExtra("data", 69)
    sendBroadcast(intent)
}