FragmentUtils

Provides communication with parent Fragment or Activity.

Android X

Since version 1.1.0 library's been using from Android X.

Getting started

In your project level build.gradle:

allprojects {
    repositories {
        // ...
        maven { url 'https://jitpack.io' }
    }
}

And in your app level build.gradle:

For java version

dependencies {
    implementation 'com.github.mac229.FragmentUtils:fragmentutils:1.2.1'
}

For kotlin version

dependencies {
    implementation 'com.github.mac229.FragmentUtils:fragmentutils-kt:1.2.1'
}

Usage in Java

Step 1. Implement listener in your Activity or parent Fragment:

public class MainActivity extends AppCompatActivity implements ReplaceFragmentListener  {

Step 2. Get listener in your Fragment

    private ReplaceFragmentListener replaceFragmentListener;
    
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        replaceFragmentListener = FragmentUtils.getListener(this, ReplaceFragmentListener.class);
    }

Kotlin

dependencies {
    implementation 'com.github.mac229.FragmentUtils:fragmentutils-kt:1.2.1'
}

Step 1. Implement listener in your Activity or parent Fragment:

class MainActivity : AppCompatActivity(), ReplaceFragmentListener {

Step 2. Get listener in your Fragment

    private var replaceFragmentListener: ReplaceFragmentListener? = null

    override fun onAttach(context: Context?) {
        super.onAttach(context)
        replaceFragmentListener = getListener()
    }

Features - You can use additional features in both - java and kotlin versions

1. Get listener or throw exception when parent doesn't implement listener:

    private lateinit var replaceFragmentListener: ReplaceFragmentListener

    override fun onAttach(context: Context?) {
        super.onAttach(context)
        replaceFragmentListener = getListenerOrThrowException()
    }

2. You also can use generic findFragmentByTag:

    val fragment = supportFragmentManager.findFragmentByTag(TAG)