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Android Studio – i am trying to add name and number in my recyler view contact list but when i click add button the app stop working and close

MainActivity of my code package com.example.recycleview; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.app.Dialog; import android.os.Bundle; import android.view.View; import android.widget.Adapter; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import com.google.android.material.floatingactionbutton.FloatingActionButton; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { ArrayList<ContactModel>arrContact= new ArrayList<>(); RecyclerContactAdapter…

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Android Studio – How Can I Resolve Preview Display Issues in Android Studio After Upgrading to Electric Eel?

<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".fragments.MainFragment"> <com.google.android.material.card.MaterialCardView android:layout_width="match_parent" android:layout_height="match_parent"> </com.google.android.material.card.MaterialCardView> </androidx.constraintlayout.widget.ConstraintLayout> Preview will looks like this: <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".fragments.MainFragment"> </androidx.constraintlayout.widget.ConstraintLayout> Preview will looks like this: I upgraded Android Studio to Electric…

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