Question

我有问题，我想请你帮忙。我想使用一个简单的游标适配器，从几列中的listView中的SQLite数据库数据中获取视图。我自己做了一个列表视图（row_players.xml）：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form></form>
<div id="something"></div>

然后在DatabaseHelper中我创建了一个从数据中收集的扩展列表：

FeedbackForm

最后，我尝试使用简单光标适配器显示列表中的数据：

 <?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:stretchColumns="*">

    <TableRow
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
        <TextView
            android:id="@+id/id"
            android:layout_column="0"
            android:padding="0dp"
            android:layout_span="2"
            />

        <TextView
            android:id="@+id/playerNameListView"
            android:layout_column="1"
            android:padding="0dp"
            />
    </TableRow>
</TableLayout>

当我尝试运行活动时，我遇到以下错误：

public ArrayList<HashMap<String, String>> getAllPlayers() {
    try {
        ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
        HashMap<String, String> map;
        SQLiteDatabase db = this.getReadableDatabase();
        String sqlSelect = "SELECT " + _id + ", " +
                columnPlayerName  + " FROM " + TABLE_NAME;
        Cursor select = db.rawQuery(sqlSelect, null);
        if(select != null) {
            if(select.moveToFirst()) {
                do {
                    map = new HashMap<String, String>();
                    map.put("id", select.getString(0));
                    map.put("name", select.getString(1));
                    arraylist.add(map);
                }
                while(select.moveToNext());
            }
        }
        select.close();
        db.close();
        return arraylist;
    }
    catch (Exception E) {
        return null;
    }
}

请帮助:(

--- --- EDIT activity_manage_players.xml：

public class ManagePlayers extends AppCompatActivity {
    DatabaseHelperPlayer playerDb = new DatabaseHelperPlayer(this);
    ListView playersList;
    ArrayList<HashMap<String, String>> playerList = playerDb.getAllPlayers();

    private void playersListView() {
        playersList = (ListView) findViewById(R.id.listPlayer);
        SimpleAdapter adt = new SimpleAdapter(this, playerList, R.layout.row_players, new String[]{"id", "name"}, new int[]{R.id.id, R.id.playerNameListView});
        playersList.setAdapter(adt);
        //adapter = new ArrayAdapter<PlayersList>(this, R.layout.row_players, R.id.id, playerDb.playersList());
        //playersList.setAdapter(adapter);

    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_manage_players);

        playersListView();
    }
}

Android简单游标适配器，列表视图，多列

0 个答案: