How do i use Log.d in react-native native module?

Question

I want to see when certain methods get fired inside a native module.

I've imported

import android.util.Log;

in the java file that I want to write my log to.

Here's the method I would like to log.

public void play(int frequency, double duration, double amplitude, int mode) {
        BlueManager blueManager = BLueServiceManager.getSharedBlueManager();
        if (blueManager == null || !blueManager.isConnected()) {
            return;
        }

        byte actualFreq = (byte) (frequency / EQ_STEP_SIZE);
        short actualDuration = (short) (duration * 1800);
        blueManager.playTone(actualFreq, actualDuration, amplitude);
    }

I've attempted to add

Log.d("is this thing working???", "I certainly hope so");

inside the method.

I have Android Studio open and I'm looking at the Logcat window. I don't see my message anywhere even though I know that I've accessed that method.

Nizam · Accepted Answer · 2018-12-07 10:14:27Z

1

Inside Logcat, I can see, you've selected only "info" messages to display.

Log.d() stands for debug messages, So, will not come under "info"(Log.i()) messages.

Change it and select "Debug". You'll see the message. Or select "Verbose" to see all the messages, whichever type.

answered Dec 7, 2018 at 10:14

Nizam

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Sha · Accepted Answer · 2023-08-18 14:33:55Z

1

If you run your app on a real device :

Log.d('Notification', 'Log from the app');

you should start listening log by the command :

adb logcat -s Notification:D

Notice that 1st parameter in Log.d, a TAG for logcat command.

Complete docs here : https://developer.android.com/studio/command-line/logcat?hl=fr

answered Aug 18, 2023 at 14:33

Sha

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1 Comment

sanjarcode Over a year ago

Need to use double quotes in Log.d

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