Question

我收到了这段代码：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_clicked);
    String query = "SELECT ROWID _id, linie"
            + " FROM linie";

    ArrayList<String> HaltestellenListe = CursorToArray(getApplicationContext(), query, new String[] {});

    final ListView lvD = (ListView) findViewById(R.id.lvClicked);


    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, R.layout.activity_clicked, R.id.tvClicked, HaltestellenListe);
    lvD.setAdapter(arrayAdapter);
    lvD.setDividerHeight(8);



    lvD.setOnItemClickListener(new OnItemClickListener() { 
             @Override
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                  String linie = lvD.getItemAtPosition(position).toString();

                 }
        });






}

public ArrayList<String> CursorToArray(Context ApplicationContext, String query, String[] whereClause){
    ArrayList<String> ArrayList = new ArrayList<String>();

    DataBaseHelper dbHelper = new DataBaseHelper(getBaseContext());

    Cursor c = dbHelper.dbHelper(ApplicationContext).rawQuery(query, whereClause);
    dbHelper.close();

    c.moveToFirst();


    while (!c.isAfterLast()){

        if (c.isNull(c.getColumnIndex("linie")) == false){
            ArrayList.add(c.getString(c.getColumnIndex("linie")));  
        }


        c.moveToNext();
    }
    c.close();

    return ArrayList;
}

使用setonitemclicklistener我得到点击位置的字符串。如何将此字符串用于新的字符串查询，如下所示：

lvD.setOnItemClickListener(new OnItemClickListener() { 
             @Override
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                  setContentView(R.layout.activity_clicked);
                  String newQuery = "SELECT ROWID _id, linie" + "FROM linie" + "WHERE name =" + lvD.getItemAtPosition(position).toString();                   
                  ArrayList<String> ClickedList = CursorToArray(getApplicationContext(), newQuery, new String[] {});
                  final ListView lvD = (ListView) findViewById(R.id.lvClicked);                 
                  ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, R.layout.activity_clicked, R.id.tvClicked, ClickedList);
                  lvD.setAdapter(arrayAdapter);
                  lvD.setDividerHeight(8);

                 }
        });

我希望新文本位于同一列表视图中基本上我想使用新查询中第一个查询的字符串。我是非常新的java所以请帮助我。

Answer 1

您需要在查询中放置名称值的引号，并在其间放置空格，如下所示：

String newQuery = "SELECT ROWID _id, linie" + " FROM linie " + 
           " WHERE name = '" + lvD.getItemAtPosition(position).toString()+"'";

由于您的lvd是最终版，因此可直接在您的方法中使用。删除下面的行以找到它：
```
//remove this line
final ListView lvD = (ListView) findViewById(R.id.lvClicked); 
```

来自新字符串查询中的表的字符串

1 个答案: