How to View `java.util.logging.Logger` Logs in Android Studio Logcat

How can I display logs generated by `java.util.logging.Logger` in Android Studio's Logcat?

import java.util.logging.*;

public class Main {
    public static void main(String[] args) {
        Logger logger = Logger.getLogger(Main.class.getName());
        logger.info("This is an info message");
        logger.warning("This is a warning message");
    }
}

To display logs from `java.util.logging.Logger` in Android Studio's Logcat window, follow these steps to configure your logging output correctly and ensure compatibility with Logcat.

import java.util.logging.*;
import android.util.Log;

public class AndroidLogger { 
    private static final Logger logger = Logger.getLogger(AndroidLogger.class.getName());

    static { 
        ConsoleHandler ch = new ConsoleHandler();
        ch.setOutputStream(new OutputStream() { 
            @Override 
            public void write(int b) {
                Log.d("JavaUtilLogging", String.valueOf((char) b));
            }
        });
        logger.addHandler(ch);
        logger.setLevel(Level.ALL);
    }
    
    public static void main(String[] args) {
        logger.info("Logging info to Logcat");
        logger.warning("Logging warning to Logcat");
    }
}

Causes

• The `java.util.logging` configuration might not direct output to the console that Logcat reads.
• Default logging level may filter out certain messages if they are not configured correctly in Android.

Solutions

• Ensure that the `java.util.logging` library is included in your Android project dependencies.
• Configure a `ConsoleHandler` to output logs from `java.util.logging.Logger` to the standard output stream.
• Set the appropriate logging level to capture all desired logs.
• Use a custom `Handler` that redirects logs to Logcat.

Mistake: Not configuring the Logger's handlers correctly.

Solution: Ensure to add a ConsoleHandler to the Logger and set its output stream to redirect to Logcat.

Mistake: Setting the logger level too high (e.g., WARNING) prevents lower level logs from appearing.

Solution: Set the logger's level to ALL or INFO to capture all relevant log messages.