Here we are again. I hope this will make it easier how to compare the task to the result. Do you want to know which lesson is that? -> Custom ArrayAdapter Exercise from Udacity, Android Basics Nanodegree Program. Multi Screen Apps -> LESSON 3 Arrays, Lists, Loops, & Custom Classes Use Arrays, Lists, and Loops

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/miwok_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginLeft="16dp"
        tools:text="luffi"
        android:textAppearance="?android:textAppearanceLarge"
        android:textColor="#4689C8"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/default_text_view2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginLeft="16dp"
        tools:text="one"
        android:textAppearance="?android:textAppearanceLarge"
        android:textColor="#4689C8"
        android:textStyle="bold" />
</LinearLayout>

NumbersActivity.java

package com.example.android.miwok;

import android.os.Bundle;
import android.widget.ListView;
import java.util.ArrayList;
import androidx.appcompat.app.AppCompatActivity;

public class NumbersActivity extends AppCompatActivity {

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

        //create an ArrayList of words
        ArrayList<Word> words = new ArrayList<Word>();

        //words.add("one");
        //Word w = new Word("one","lutti");
        //words.add(w);

        //or you can add this way word to the list
        words.add(new Word("one", "lutti"));
        words.add(new Word("two", "otiiko"));
        words.add(new Word("three", "tolookosu"));
        words.add(new Word("four", "oyyisa"));
        words.add(new Word("five", "massokka"));
        words.add(new Word("six", "temmokka"));
        words.add(new Word("seven", "kenekaku"));
        words.add(new Word("eight", "kawinta"));
        words.add(new Word("nine", "wo’e"));
        words.add(new Word("ten", "na’aacha"));


        // Create an {@link ArrayAdapter}, whose data source is a list of Strings. The
        // adapter knows how to create layouts for each item in the list, using the
        // simple_list_item_1.xml layout resource defined in the Android framework.
        // This list item layout contains a single {@link TextView}, which the adapter will set to
        // display a single word.
        WordAdapter adapter = new WordAdapter(this, words);

        // Find the {@link ListView} object in the view hierarchy of the {@link Activity}.
        // There should be a {@link ListView} with the view ID called list, which is declared in the
        // activity_numbers.xml layout file.
        ListView listView = findViewById(R.id.list);

        // Make the {@link ListView} use the {@link ArrayAdapter} we created above, so that the
        // {@link ListView} will display list items for each word in the list of words.
        // Do this by calling the setAdapter method on the {@link ListView} object and pass in
        // 1 argument, which is the {@link ArrayAdapter} with the variable name itemsAdapter.
        listView.setAdapter(adapter);
    }
}

Word.java

package com.example.android.miwok;

/**
 * {@link Word} represents a vocabulary word that the user wants to learn.
 * It contains a default translation and a Miwok translation for that word.
 */
public class Word {

    /** Default translation for the word */
    private String mDefaultTranslation;

    /** Miwok translation for the word */
    private String mMiwokTranslation;

    /**
     * Create a new Word object.
     *
     * @param defaultTranslation is the word in a language that the user is already familiar with
     *                           (such as English)
     * @param miwokTranslation is the word in the Miwok language
     */
    public Word(String defaultTranslation, String miwokTranslation) {
        mDefaultTranslation = defaultTranslation;
        mMiwokTranslation = miwokTranslation;
    }

    /**
     * Get the default translation of the word.
     */
    public String getDefaultTranslation() {
        return mDefaultTranslation;
    }

    /**
     * Get the Miwok translation of the word.
     */
    public String getMiwokTranslation() {
        return mMiwokTranslation;
    }

}

WordAdapter.java

package com.example.android.miwok;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;

public class WordAdapter extends ArrayAdapter<Word> {

    private static final String LOG_TAG = WordAdapter.class.getSimpleName();

    public WordAdapter(Context context, ArrayList<Word> pwords) {
        super(context, 0, pwords);
    }

    /**
     * Provides a view for an AdapterView (ListView, GridView, etc.)
     *
     * @param position    The position in the list of data that should be displayed in the
     *                    list item view.
     * @param convertView The recycled view to populate.
     * @param parent      The parent ViewGroup that is used for inflation.
     * @return The View for the position in the AdapterView.
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        // Check if the existing view is being reused, otherwise inflate the view
        View listItemView = convertView;

        if (listItemView == null) {
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.list_item, parent, false);
        }
        // Get the {@link Word} object located at this position in the list
        Word local_word = getItem(position);
        // Find the TextView in the list_item.xml layout with the ID version_name
        TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view);
        // Get the version name from the current Word object and
        // set this text on the name TextView
        miwokTextView.setText(local_word.getMiwokTranslation());
        // Find the TextView in the list_item.xml layout with the ID version_number
        TextView defaultTextView = (TextView) listItemView.findViewById(R.id.default_text_view2);
        // Get the version name from the current Word object and
        // set this text on the name TextView
        defaultTextView.setText(local_word.getDefaultTranslation());

        // Return the whole list item layout (containing 2 TextViews and an ImageView)
        // so that it can be shown in the ListView
        return listItemView;
    }
}

error: class NumberActivity is public, should be declared in a file named NumberActivity.java
public class NumberActivity extends AppCompatActivity{
^

error: cannot find symbol
Intent numbersIntent = new Intent(MainActivity.this, NumbersActivity.class);
^
symbol: class NumbersActivity

error: cannot find symbol
WordAdapter adapter = new WordAdapter(this, words);
^
symbol: class WordAdapter
location: class NumberActivity

error: cannot find symbol
WordAdapter adapter = new WordAdapter(this, words);
^
symbol: class WordAdapter
location: class NumberActivity

error: cannot find symbol
ListView listView = (ListView) findViewById(R.id.list);
^
symbol: variable list
location: class id

Hii,
can you tell me about these two lines ,

1. miwok_text_view
   2)default_text_view2
   where are these id's are located??

TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view); \listItemView.findViewById(R.id.default_text_view2);

thanks!!