set- and getListAdapter error

Question

I don't know why it shows an error. Can somebody help me.

public class MainActivityT extends Activity {
    private VerlaufDataSource datasource;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_t);


        datasource = new VerlaufDataSource(this);
        datasource.open();

        List<Entry> values = datasource.getAllEntries();


        ArrayAdapter<Entry> adapter = new ArrayAdapter<Entry>(this,
            android.R.layout.simple_list_item_1, values);

In the next Line it shows me an error, namely:

Multiple marlcers at this line
- The method setArrayAdapter(ArrayAdapter< Entry>) is undefined for the type MainActivityT
-Uno broakpoint:MainActivityT [lino: 3S] - onCroato(Bundlo)
- The method setlistAdapter(ArrayAdapter< Entrv>) is undefinod for tho type MainActivitvT

        setListAdapter(adapter);

    }




    List<Entry> AufgabenListe = new ArrayList<Entry>();

    public void VerlaufKlick(View view)
    {
        @SuppressWarnings("unchecked")

In the next Line it shows me an error, namely: Multiple makers at this line - The method getArrayAdapter() is undefined for the type MainActivityT - The method qetlistAdapter() is undefined for the tvpe MainActivitvT

        ArrayAdapter<Entry> adapter = (ArrayAdapter<Entry>) getListAdapter();
        Entry comment = null;
        switch (view.getId()) 
        {
        case R.id.button1:
          String[] comments = new String[] { "Cool", "Very nice", "Hate it" };
          int nextInt = new Random().nextInt(3);
          comment = datasource.createEntry(comments[nextInt]);
          adapter.add(comment);
          break;

        }
        adapter.notifyDataSetChanged();

    }
    @Override
      protected void onResume() 
      {
        datasource.open();
        super.onResume();
      }

      @Override
      protected void onPause() 
      {
        datasource.close();
        super.onPause();
      }


}

Answer 1

Your activity need to extend ListActivity instead of Activity .

There is no method setListAdapter/getListAdapter available in Activity class. They are available if you extend ListActivity .

Read this post on how to use ListActivity.

Answer 2

使用ListActivity代替Activity作为基类