cannot be cast to androidx.appcompat.widget.Toolbar

Question

My app crashes whenever I launch this activity and throws the error :

Caused by: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar

Below is my code, how can I fix this?

package com.example.irecipe;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.os.Bundle

import android.widget.TextView;

public class RecipeActivity extends AppCompatActivity {

    Toolbar toolbar;
    TextView toolbar_title;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recipe);

        toolbar = (androidx.appcompat.widget.Toolbar) findViewById(R.id.toolBar);
        setSupportActionBar(toolbar);

        toolbar_title = findViewById(R.id.toolBar_title);
        toolbar_title.setText("Recipe");

    }

}

Answer 1

XML for Toolbar

<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white_grey"
    android:minHeight="?attr/actionBarSize"
    app:menu="@menu/menu_top_right"
    app:titleTextColor="@android:color/white"/>

Java Code for Toolbar

Toolbar toolbar;
toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    if (getSupportActionBar() != null) {
        getSupportActionBar().setTitle("");
    }

Hope this will work for you and Its tested and working properly for me.

Answer 2

Change this:

toolbar = (androidx.appcompat.widget.Toolbar) findViewById(R.id.toolBar);

to:

toolbar = (Toolbar) findViewById(R.id.toolBar);

Answer 3

从行中删除(androidx.appcompat.widget.Toolbar) ： toolbar = (androidx.appcompat.widget.Toolbar) findViewById(R.id.toolBar)

Answer 4

Just remove this (androidx.appcompat.widget.Toolbar) , so it will be like toolbar = findViewById(R.id.toolBar); .

Answer 5

Caused by: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar

I've 2 solutions you can try:

1. Change the import of import androidx.appcompat.widget.Toolbar to import android.widget.Toolbar and remove the casting, toolbar = findViewById(R.id.toolBar);
2. change the layout implementation of <android.widget.Toolbar... to androidx.appcompat.widget.Toolbar...