Far as I understand what the error say is it expects me to provide a List instead of a ListView

but casting to java.util.List does not solve the problem, instead it just creates more errors.

what should I do in this case?

My end goal is to make a ListView that shows the result of users query with each iteration any help to point out what is actually goin on and what do I have to do is very appreciated

Here is the relevant code :

Varible :

private List<Absensi> list_absensi = new ArrayList<Absensi>();

Initialization :

list_absensi = (ListView) findViewById(R.id.ListAbsensi);
//the problem is in this line of code

XML ID for ListView :

<ListView
      android:id="@ id/ListAbsensi"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" />

    </LinearLayout>

I also have adapter for this :

public class AbsensiAdapter extends ArrayAdapter<Absensi> {

    private Context context;
    private List<Absensi> absensis;
    Picasso mypicasso;

    public AbsensiAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull List<Absensi> objects, Picasso myotherpicasso) {
        super(context, resource, objects);
        this.context = context;
        this.absensis = objects;
        this.mypicasso = myotherpicasso;
    }

    @Override
    public View getView(final int  pos, View convertview, ViewGroup parent){
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.list_absensi, parent, false);

        TextView txtabsenID = (TextView) rowView.findViewById(R.id.txtAViewId);
        TextView txtasbsenTanggal = (TextView) rowView.findViewById(R.id.txtAViewTanggal);
        TextView txtasbsenKelas = (TextView) rowView.findViewById(R.id.txtAViewKelas);
        TextView txtasbsenGuru = (TextView) rowView.findViewById(R.id.txtAViewGuru);

        txtabsenID.setText(String.format("id : %s", absensis.get(pos).getID()));
        txtasbsenTanggal.setText(String.format("Tanggal : %s",absensis.get(pos).getID()));
        txtasbsenKelas.setText(String.format("Kelas : %s",absensis.get(pos).getID()));
        txtasbsenGuru.setText(String.format("Guru : %s",absensis.get(pos).getID()));

        rowView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //start activity AbsensiDetailActivity
                Intent intent = new Intent(context, AbsensiDetailActivity.class);
                intent.putExtra("absensi_id", String.valueOf(absensis.get(pos).getID()));
                intent.putExtra("absensi_tanggal", absensis.get(pos).getTanggal());
                intent.putExtra("absensi_kelas", absensis.get(pos).getKelasName());
                intent.putExtra("absensi_guru", absensis.get(pos).getGuruName());
                context.startActivity(intent);
            }
        });

        return rowView;
    }
}

list_absensi.xml for showing the result

<LinearLayout 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"
        android:orientation="vertical">

        <TextView
            android:id="@ id/txtAViewId"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"
            tools:text="ID"
            android:visibility="gone" />

        <TextView
            android:id="@ id/txtAViewTanggal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"
            tools:text="Tanggal" />
        <TextView
            android:id="@ id/txtAViewKelas"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"
            tools:text="Kelas" />

        <TextView
            android:id="@ id/txtAViewGuru"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"
            tools:text="Guru" />

        <TextView
            android:id="@ id/txtAViewPelajaran"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"
            tools:text="Pelajaran" />
    </LinearLayout>

CodePudding user response：

This line is your root of the problems:

list_absensi = (ListView) findViewById(R.id.ListAbsensi);

Function findViewById returns object type of View. list_absensi is a view which at this case it is a ListView (you declared it in xml).

So the top declaration for your ListView should be:

private ListView list_absensi;

I have a strong feeling that you mess view with a container for storing data. ListView is for displaying the items. If you want to store data - you must use a list. At this case your should at top of your declarations add a new variable for storing data should be:

private List<Absensi> absensis = new ArrayList<Absensi>();