How to log method execution time with Timber in Kotlin Android

How to log method execution time with Timber in Kotlin Android.

In this tutorial, we will learn how to log the execution time of methods using the Timber logging library in Kotlin for Android development.

Prerequisites

Before we begin, make sure you have the following:

Android Studio installed on your machine
A basic understanding of Kotlin and Android development

Step 1: Set up Timber in your Android project

To use Timber in your Android project, you need to add the Timber library as a dependency in your build.gradle file. Open your project's build.gradle file and add the following line to the dependencies block:

implementation 'com.jakewharton.timber:timber:4.7.1'

After adding the dependency, sync your project to download the Timber library.

Step 2: Configure Timber in your application class

To configure Timber in your application class, create a new class that extends the Application class. In this class, override the onCreate method and initialize Timber.

import android.app.Application
import timber.log.Timber

class MyApplication : Application() {
    override fun onCreate() {
        super.onCreate()
        
        Timber.plant(Timber.DebugTree())
    }
}

Make sure to update your AndroidManifest.xml file to use the custom application class by adding the android:name attribute to the application tag:

<application
    android:name=".MyApplication"
    ...

Step 3: Log method execution time

To log the execution time of a method, we will use Timber's d method with a custom message and the elapsed time. Wrap the code you want to measure with Timber's begin and end methods.

Here's an example of how to log the execution time of a method:

import timber.log.Timber

class MyClass {
    fun myMethod() {
        Timber.d("myMethod started")
        
        val startTime = System.currentTimeMillis()
        
        // Code to measure execution time
        
        val endTime = System.currentTimeMillis()
        val elapsedTime = endTime - startTime
        
        Timber.d("myMethod finished. Elapsed time: %d ms", elapsedTime)
    }
}

In this example, we first log a message indicating that the method has started. Then, we capture the start time using System.currentTimeMillis(). After the code block we want to measure, we capture the end time and calculate the elapsed time. Finally, we log a message with the elapsed time.

Step 4: Use Timber in your project

Now that we have set up Timber and know how to log method execution time, we can use it in our project.

To log the execution time of a method, simply call the method from your code. For example:

val myClass = MyClass()
myClass.myMethod()

When you run your application, you should see the method execution time logged in the logcat output.

Conclusion

In this tutorial, we learned how to log the execution time of methods using the Timber logging library in Kotlin for Android development. By following these steps, you can easily measure and log the execution time of any method in your application.

Prerequisites​

Step 1: Set up Timber in your Android project​

Step 2: Configure Timber in your application class​

Step 3: Log method execution time​

Step 4: Use Timber in your project​

Conclusion​