Kotlin App stopped working (LOGCAT included) - I am a Beginner in Coding

Issue

I dont know what I did, but my App doesnt work anymore - Can you help ?

This is the first lines of the Logcat that I get when i try starting the App

2022-01-14 17:17:10.138 14076-14076/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: org.wit.location, PID: 14076
    java.lang.RuntimeException: Unable to start activity ComponentInfo{org.wit.location/org.wit.location.activities.LocationList}: android.view.InflateException: Binary XML file line #16 in org.wit.location:layout/list_of_locations: Binary XML file line #16 in org.wit.location:layout/list_of_locations: Error inflating class com.google.android.material.appbar.AppBarLayout
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)

[...]

And in my manifests.xml file there is something underlined, I dont know if it is important? enter image description here

 <?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="org.wit.location.activities.LocationList">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:fitsSystemWindows="true"
        app:elevation="0dip"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:titleTextColor="@color/colorPrimary" />
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

In Case you need this file too

import android.content.Intent
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import org.wit.location.R
import org.wit.location.adapters.LocationAdapter
import org.wit.location.adapters.LocationListener
import org.wit.location.databinding.ListOfLocationsBinding
import org.wit.location.main.MainApp
import org.wit.location.models.Location_Model

class LocationList : AppCompatActivity(), LocationListener {

    lateinit var app: MainApp
    private lateinit var binding: ListOfLocationsBinding
    private lateinit var refreshIntentLauncher : ActivityResultLauncher<Intent>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ListOfLocationsBinding.inflate(layoutInflater)
        setContentView(binding.root)
        binding.toolbar.title = title
        setSupportActionBar(binding.toolbar)

        app = application as MainApp

        val layoutManager = LinearLayoutManager(this)
        binding.recyclerView.layoutManager = layoutManager
        binding.recyclerView.adapter = LocationAdapter(app.locations.findAll(),this)


        registerRefreshCallback()
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        menuInflater.inflate(R.menu.mainmenu, menu)
        return super.onCreateOptionsMenu(menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            R.id.item_add -> {
                val launcherIntent = Intent(this, BasicLocation::class.java)
                refreshIntentLauncher.launch(launcherIntent)
            }
        }
        return super.onOptionsItemSelected(item)
    }

    override fun onLocationClick(location: Location_Model) {
        val launcherIntent = Intent(this, BasicLocation::class.java)
        launcherIntent.putExtra("location_edit", location)
        refreshIntentLauncher.launch(launcherIntent)
    }

    private fun registerRefreshCallback() {
        refreshIntentLauncher =
            registerForActivityResult(ActivityResultContracts.StartActivityForResult())
            { binding.recyclerView.adapter?.notifyDataSetChanged() }
    }
}

Solution

What theme are you using? Have you tried removing the appbarlayout first to see if it crash? And you might need to use material theme in your application

Answered By - Bryan.C