CODEWITHSUNDEEP
androidconnectionhdmi
rohitb
rohitb

Reputation: 235

How to check the HDMI device connection status in Android?

I need to detect whether an HDMI device is connected or not to my Android device. For this I'm using a BroadcastReceiver and it is able to detect also. But with BroadcastReceiver I'm unable to handle the scenario when the HDMI device is connected even before my application was launced. In this case the BroadcastReceiver is unable to find if any HDMI device is connected or not. Is there any way I can get to know if any HDMI device is connected or not at any point?

Upvotes: 15

Views: 29535

Answers (6)

erfanilaghi
erfanilaghi

Reputation: 278

In every android device its different from another that where you should check. I'm using a cheap android box with android 11 and I've find it in:

cat /sys/class/hdmi/hdmi/attr/hdmi_source | grep RxSense

Upvotes: 1

Yi Wang
Yi Wang

Reputation: 552

check the file /sys/class/switch/hdmi/state, if it's 1 then it's connected to an HDMI.

Upvotes: 1

Aj_31
Aj_31

Reputation: 187

You can get the data from /sys/class/display/display0.hdmi/connect. If the content of the file is 0, HDMI is not connected, otherwise if it's 1, HDMI is connected.

try {
    File file = new File("/sys/class/display/display0.hdmi/connect");
    InputStream in = new FileInputStream(file);
    byte[] re = new byte[32768];
    int read = 0;
    while ((read = in.read(re, 0, 32768)) != -1) {
        String string = new String(re, 0, read);
        Log.v("String_whilecondition", "HDMI state = " + string);
        result = string;
    }
    in.close();
} catch (IOException ex) {
    ex.printStackTrace();
}

Upvotes: 5

Ivan Morgillo
Ivan Morgillo

Reputation: 3844

I came out with this eventually. It's working on S3 and S4. It should work with any 4+ Android version.

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);

            if (state) {
                Log.d("HDMIListner", "BroadcastReceiver.onReceive() : Connected HDMI-TV");
                Toast.makeText(ctxt, "HDMI >>", Toast.LENGTH_LONG).show();    
            } else {
                Log.d("HDMIListner", "HDMI >>: Disconnected HDMI-TV");
                Toast.makeText(ctxt, "HDMI DisConnected>>", Toast.LENGTH_LONG).show();
            }
        }
    }
}

AndroidManifest.xml needs this into application tag:

    <receiver android:name="__com.example.android__.HdmiListener" >
        <intent-filter>
            <action android:name="android.intent.action.HDMI_PLUGGED" />
        </intent-filter>
    </receiver>

Upvotes: 6

Tom
Tom

Reputation: 7804

I came up with this using the other answers and some from elsewhere:

/**
 * Checks device switch files to see if an HDMI device/MHL device is plugged in, returning true if so.
 */
private boolean isHdmiSwitchSet() {

    // The file '/sys/devices/virtual/switch/hdmi/state' holds an int -- if it's 1 then an HDMI device is connected.
    // An alternative file to check is '/sys/class/switch/hdmi/state' which exists instead on certain devices.
    File switchFile = new File("/sys/devices/virtual/switch/hdmi/state");
    if (!switchFile.exists()) {
        switchFile = new File("/sys/class/switch/hdmi/state");
    }
    try {
        Scanner switchFileScanner = new Scanner(switchFile);
        int switchValue = switchFileScanner.nextInt();
        switchFileScanner.close();
        return switchValue > 0;
    } catch (Exception e) {
        return false;
    }
}

If you're checking often, you'd want to store the result and update it with @hamen's listener.

Upvotes: 10

anroots
anroots

Reputation: 2069

Same problem here. Some google-ing told me there's not much hope with other manufacturers besides Motorola, however from http://developer.sonymobile.com/wp/2012/05/29/how-to-use-the-hidden-hdmi-api-tutorial/:

An application can detect if the device is connect via an HDMI connector by listening to the broadcast intent: "com.sonyericsson.intent.action.HDMI_EVENT"

Upvotes: 1

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