将自定义列表视图添加到片段

Question

I am trying to work with a custom listview in a fragment, and I tried a lot of things, I watched videos and I looked for solutions in this site, but I get confused because it doesn't work. My problem is that in the code, I can't make work the custom adapter, it crash when the fragment inflates, and with the "(AppCompatActivity)" added, it doesn't crash but the listview doesn't show anything.

Is there something I could do with this? Should I try another thing?

This is the Fragment I want to use the ListView

public class RecordFragment extends Fragment {

 private ArrayList<Record> scoreList;

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_record, container, false);
    scoreList= new ArrayList<>();

    scoreList.add(new Record("Math", 10, "9/1/2017 13:45"));
    scoreList.add(new Record("Math", 8, "7/5/2017 10:50"));
    scoreList.add(new Record("Marh", 4, "7/7/2017 16:30"));

    CustomAdapter adapter = new CustomAdapter(RecordFragment.this.getActivity(), android.R.layout.simple_list_item_1, scoreList);

    ListView list1 = (ListView)view.findViewById(R.id.list1);
    list1.setAdapter(adapter);

    return view;
 }

 private class CustomAdapter extends ArrayAdapter<Record>{
    AppCompatActivity appCompatActivity;

    CustomAdapter(AppCompatActivity context){
        super(context, R.layout.record_fragment, scoreList);
        appCompatActivity = context;
     }

     public View getView(int position, View convertView, ViewGroup parent){
        LayoutInflater inflater = appCompatActivity.getLayoutInflater();
        View item = inflater.inflate(R.layout.record_fragment, null);

        TextView tv1, tv2, tv3;
        tv1 = (TextView)item.findViewById(R.id.tv1);
        tv2 = (TextView)item.findViewById(R.id.tv2);
        tv3 = (TextView)item.findViewById(R.id.tv3);

        tv1.setText(scoreList.get(position).getTest());
        tv2.setText(scoreList.get(position).getScore());
        tv3.setText(scoreList.get(position).getDate());

        return item;
    }
 }

  public interface OnFragmentInteractionListener {
    void onFragmentInteraction(Uri uri);
  }
}

This is the XML with the visual interface of each ListView item

<TextView
    android:id="@+id/tv1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="" />

<TextView
    android:id="@+id/tv2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="" />

<TextView
    android:id="@+id/tv3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="" />

And this is the class I created to represent each ListView item

class Record{
  private String test, date;
  private int score;

  public Record(String test, int score, String date)
  {
    this.test= test;
    this.score= score;
    this.date = date;
  }

  public String getTest() {
    return test;
  }

  public int getScore(){
    return score;
  }

  public String getDate(){
    return date;
  }
}

If there is something else I have to show tell me, please. Beforehand, thank you.

EDIT: I fixed some spelling mistakes. And this line in the Fragment doesn't compile:

CustomAdapter adapter = new CustomAdapter(RecordFragment.this.getActivity(), android.R.layout.simple_list_item_1, scoreList);

This message is displayed when I try to run it (I guest is the error log):

Error:(39, 40) error: constructor CustomAdapter in class RecordFragment.CustomAdapter cannot be applied to given types;

required: AppCompatActivity found: FragmentActivity,int,ArrayList reason: actual and formal argument lists differ in length

Answer 1

According to your question you are facing this problem

after adding AppcompatActivity your app is not crashing but list is not showing anything

Your Adapter is asking for Context from your Activity which is AppCompat Type . So if when your host activity is not extending AppcompatActivity it will crash

So when you change it to AppcompatActivity it won't crash

Now lets solve the problem of showing a blank listView you didn't override the parent method getCount() . In the getCount() method return size items in your List.

Another thing CustomAdapter adapter = new CustomAdapter(RecordFragment.this.getActivity(), android.R.layout.simple_list_item_1, scoreList); I don't think your code compiles with this line as your AdaptadorHistorial(AppCompatActivity context){ super(context, R.layout.record_fragment, scoreList); appCompatActivity = context; } AdaptadorHistorial(AppCompatActivity context){ super(context, R.layout.record_fragment, scoreList); appCompatActivity = context; } AdaptadorHistorial(AppCompatActivity context){ super(context, R.layout.record_fragment, scoreList); appCompatActivity = context; } custom adapter is taking one parameter but you are passing two

your constructor should be like this

AdaptadorHistorial(Context context , List<Record> scoreList){
    super(context, R.layout.record_fragment, scoreList);
    this.context = context;
    this.items = scoreList;

 }



@override
public int getCount(){
 return items.size();
}