Listen to HDMI plugged and unplugged events on Android TV

Question

I need to receive the HDMI state events for my Android TV app.

I found this code in several places:

public class HdmiListener extends BroadcastReceiver {

    private static String HDMIINTENT = "android.intent.action.HDMI_PLUGGED";

    @Override
    public void onReceive(Context ctxt, Intent receivedIt) {
        String action = receivedIt.getAction();

        if (action.equals(HDMIINTENT)) {
            boolean state = receivedIt.getBooleanExtra("state", false);
        }
    }
}

with this in manifest:

<receiver android:name="[package].HdmiListener" >
    <intent-filter>
        <action android:name="android.intent.action.HDMI_PLUGGED" />
    </intent-filter>
</receiver>

but it does not work. The broadcast receiver never gets triggered.

I did some digging through AOSP and other projects and were able to come up with a more complete version of the manifest entry:

    <permission android:name="android.permission.TV_INPUT_HARDWARE"
        android:protectionLevel="signatureOrSystem"
        tools:ignore="SignatureOrSystemPermissions" />

    <permission android:name="android.permission.CAPTURE_TV_INPUT"
        android:protectionLevel="signatureOrSystem"
        tools:ignore="SignatureOrSystemPermissions" />

    <receiver android:name="[package].HdmiListener"
        android:enabled="true"
        android:exported="true" >
        <intent-filter>
            <action android:name="android.intent.action.HDMI_PLUG" />
            <action android:name="android.intent.action.HDMI_PLUGGED" />
            <action android:name="android.intent.action.TVOUT_PLUG" />
            <action android:name="android.media.action.HDMI_AUDIO_PLUG" />
        </intent-filter>
    </receiver>

but is still does not work :-(

So, my question is - did anybody get this to actually work? Or is it a system-level-only feature, as the permissions would suggest?

Hey :-) There are no error logs. The BroadcastReceiver is not triggered :-( — Kelevandos, Jun 15 '18 at 15:28
https://gist.github.com/oleynikd/1065521ee3236a60b804ad063020021f — oleynikd, Mar 19 '20 at 13:27

score 0 · Answer 1 · answered Jun 20 '18 at 09:10

android.intent.action.HDMI_PLUGGED has FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT flag. From the comment in Intent.java:

 FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT

 * If set, when sending a broadcast before boot has completed only
 * registered receivers will be called -- no BroadcastReceiver components
 * will be launched.  Sticky intent state will be recorded properly even
 * if no receivers wind up being called.  If {@link #FLAG_RECEIVER_REGISTERED_ONLY}
 * is specified in the broadcast intent, this flag is unnecessary.
 *
 * <p>This flag is only for use by system sevices as a convenience to
 * avoid having to implement a more complex mechanism around detection
 * of boot completion.

At least, receiver should be registered by calling registerReceiver.

Listen to HDMI plugged and unplugged events on Android TV

1 Answers1