Question

我有一个带有SimpleCursorAdapter的ListView显示整数。如何添加所有这些整数并在字符串中显示总数？

看看Toast显示每个项目的值，但TextView（总计）不

public static final String ROW_ID = "row_id";
private static final String TITLE_APROVADAS = "title";
private static final String CREDITOS_APROVADAS = "creditos";
private ListView noteListView;
private SimpleCursorAdapter noteAdapter;
private Cursor cursor;
private TextView total;

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

    noteListView=(ListView)findViewById(R.id.listViewTarea);
    total=(TextView)findViewById(R.id.texto_contador); 

    noteAdapter  = new SimpleCursorAdapter(this,R.layout.aprovadas_textview,cursor,
    new String[] {TITLE_APROVADAS,CREDITOS_APROVADAS},

    new int[] {R.id.titulo_aprovadas_texto_listview, R.id.creditos_aprovadas_texto_listview},1){

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
    View view = super.getView(position, convertView, parent);

    view.findViewById(R.id.titulo_aprovadas_texto_listview);
    TextView credito = (TextView) view.findViewById(R.id.creditos_aprovadas_texto_listview);

    String txtCredito=credito.getText().toString();
    int losCreditos=Integer.parseInt(txtCredito);
    total.setText(""+losCreditos);
    Toast.makeText(ZMainActivity.this, ""+losCreditos, Toast.LENGTH_LONG).show();

     return view;
   }
   };
    noteListView.setAdapter(noteAdapter);
}
@Override
protected void onResume() {
    super.onResume();
    new GetNotes().execute((Object[]) null);
}
@Override
protected void onStop() {
    Cursor cursor = noteAdapter.getCursor();
    if(cursor != null ){
    cursor.deactivate();
    noteAdapter.changeCursor(null);
    super.onStop();}
}

public class GetNotes extends AsyncTask<Object, Object, Cursor> {
    Aprovadas_DatabaseConnector dbConnector = new Aprovadas_DatabaseConnector(ZMainActivity.this);
    @Override
    protected Cursor doInBackground(Object... params) {
        // Open the database
        dbConnector.open();
        return (dbConnector.ListAllNotes());
    }
    @Override
    protected void onPostExecute(Cursor result) {
        noteAdapter.changeCursor(result);
        // Close Database
        dbConnector.close();

    }}

}

Answer 1

您应该总结数据提供者的所有值（猜测ArrayList）。迭代数组并将当前值添加到sum，然后显示它。

你需要做这样的事情

JPanel

您可能需要创建方法getCreditos以在每个节点中返回信用值，但是从中确定这是基本想法。

ListView中项的总和值

1 个答案: