Custom Base Adapter to ListView

Question

I have tried so many different tutorials trying to get it work I'm wondering if something is wrong with my machine.. This is my MainActivity where I create myadapter and set it to the ListView.

public class MainActivity extends Activity {

UserRepo userRepo;
ArrayList<user> userList;
ListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    list = (ListView) findViewById(R.id.listView);
    userRepo = new UserRepo();
    userList = userRepo.getUserArrayList();
    UserAdapter myadapter = new UserAdapter(this, userList );
    list.setAdapter(myadapter);
}

}

This is my custom user class.

public class user {

String name;
String description;


public user(String name, String description) {
    this.name = name;
    this.description = description;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}
}

This is my custom UserAdapter. I have tried so many different versions of this from so many different tutorials and no matter what I do I can't get it to work with the ArrayList that I'm passing it.

public class UserAdapter extends BaseAdapter {


ArrayList<user> list;
Context context;
LayoutInflater mInflater;

public UserAdapter(Context c, ArrayList<user> list)
{
    context = c;
    this.list = list;
    mInflater = LayoutInflater.from(this.context);

}

@Override
public int getCount() {
    return list.size();
}

@Override
public Object getItem(int position) {
    return list.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    MyViewHolder mViewHolder;

    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.rowlayout, parent, false);
        mViewHolder = new MyViewHolder(convertView);
        convertView.setTag(mViewHolder);
    } else {
        mViewHolder = (MyViewHolder) convertView.getTag();
    }

    user currentListData = (user) getItem(position);

    mViewHolder.tv_name.setText(currentListData.getName());
    mViewHolder.tv_description.setText(currentListData.getDescription());


    return convertView;
}

private class MyViewHolder {
    TextView tv_name, tv_description;


    public MyViewHolder(View item) {
        tv_name = (TextView) item.findViewById(R.id.tv_name);
        tv_description = (TextView) item.findViewById(R.id.tv_description);

    }
}
}

This is my UserRepo where I create the ArrayList and have a method that I can use to create it and return one.

public class UserRepo {
ArrayList<user> list;

public ArrayList<user> getUserArrayList(){
    user john = new user("John", "Samoan Flatmate");
    list.add(john);
    user ariki = new user ("Ariki", "Māori Flatmate");
    list.add(ariki);
    user dion = new user ("Dion", "Asian Flatemate");
    list.add(dion);

    return list;
}
}

This is my manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.petakirikiri.customlistview">
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>

Answer 1

Inside the UserRepo class you never initialize ArrayList<user> list. Change the code to initialize it.

public class UserRepo {
    ArrayList<user> list = new ArrayList<>();
    // The rest of your code
}