如何将光标数据（DbHandler.java）添加到列表视图（MainActicity.java）？

Question

我MainActivity.java代码：

public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener{ 
    Spinner spinner1; 
    TextView textView; 
    ListView listView; 

    @Override 
    public void onCreate(Bundle savedInstanceState) {            //ThisIsWorkingAsExpected(SoDontChange) 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     spinner1 = (Spinner) findViewById(R.id.spinner1); 
     textView = (TextView) findViewById(R.id.textview); 
     listView = (ListView) findViewById(R.id.listview); 
     spinner1.setOnItemSelectedListener(this); 
     loadSpinnerData(); 
    } 

    public void loadSpinnerData() {                //ThisIsWorkingAsExpected(SoDontChange) 
     DbHandler db = new DbHandler(getApplicationContext()); 
     List<String> BusNoList = db.getBusNoType(); 
     ArrayAdapter<String> SpinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, BusNoList); SpinnerAdapter.setDropDownViewResource(android.R.layout.select_dialog_singlechoice); 
     spinner1.setAdapter(SpinnerAdapter); 
    } 

    @Override 
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
     DbHandler db = new DbHandler(getApplicationContext()); 
     List<String> BusRouteList = db.getBusRoute(); 
     ArrayAdapter<String> lvAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, BusRouteList); 
     listView.setAdapter(lvAdapter); 
    } 


    @Override 
    public void onNothingSelected(AdapterView<?> parent) { 

    } 

} 

我DbHandler.java代码：

public class DbHandler extends SQLiteOpenHelper{ 
private static final int DATABASE_VERSION = 9; 
private static final String DATABASE_NAME = "TravelMadurai"; 
private static final String TAG = "DbHandler"; 

public DbHandler(Context context) 
{ 
    super(context, DATABASE_NAME, null , DATABASE_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db)               //TABLES NOT CREATINIG IF DATABASE IS ALREADY THERE 
{ 
    try 
    { 
      db.execSQL("CREATE TABLE IF NOT EXISTS MDUBusRoutes(ID INTEGER PRIMARY KEY,Bus_No_Type TEXT,From_Loc TEXT,To_Loc TEXT,Route_1 TEXT,Route_2 TEXT,Route_3 TEXT,Route_4 TEXT,Route_5 TEXT,Route_6 TEXT,Route_7 TEXT,Route_8 TEXT,Route_9 TEXT,Route_10 TEXT,Route_11 TEXT,Route_12 TEXT,Route_13 TEXT,Route_14 TEXT,Route_15 TEXT,Total_Stops INTEGER)"); 
      db.execSQL("INSERT INTO MDUBusRoutes(Bus_No_Type,From_Loc,To_Loc,Route_1,Route_2,Route_3,Route_4,Route_5,Route_6,Route_7,Route_8,Route_9,Route_10,Route_11,Route_12,Route_13,Route_14,Route_15,Total_Stops)VALUES('C5','c5route1','c5route2','c5route3','c5route4','c5route5','c5route6','c5route7','c5route8','c5route9','c5route10','c5route11','c5route12','c5route13','c5route14','c5route15','c5route16','c5route17',15)"); 
      db.execSQL("INSERT INTO MDUBusRoutes(Bus_No_Type,From_Loc,To_Loc,Route_1,Route_2,Route_3,Route_4,Route_5,Route_6,Route_7,Route_8,Route_9,Route_10,Route_11,Route_12,Route_13,Route_14,Route_15,Total_Stops)VALUES('A5','a5Route1','a5Route2','a5Route3','a5Route4','a5Route5','a5Route6','a5Route7','a5Route8','a5Route9','a5Route10','a5Route11','a5Route12','a5Route13','a5Route14','a5Route15','a5Route16','a5Route17',15)"); 
      db.execSQL("INSERT INTO MDUBusRoutes(Bus_No_Type,From_Loc,To_Loc,Route_1,Route_2,Route_3,Route_4,Route_5,Route_6,Route_7,Route_8,Route_9,Route_10,Route_11,Route_12,Route_13,Route_14,Route_15,Total_Stops)VALUES('B7','b7Route1','b7Route2','b7Route3','b7Route4','b7Route5','b7Route6','b7Route7','b7Route8','b7Route9','b7Route10','b7Route11','b7Route12','b7Route13','b7Route14','b7Route15','b7Route16','b7Route17',15)"); 
    } 
    catch (Exception e){ 
     Log.d(TAG,"ErrorCreatingTable" + e); 
    } 

} 


@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
{ 
    db.execSQL("DROP TABLE IF EXISTS MDUBusRoutes"); 
    onCreate(db); 
} 


public List<String> getBusNoType()                //ThisIsWorkingAsExpected(SoDontChange) 
{ 
List<String> BusNoList = new ArrayList<String>(); 
try { 
    String SelectBusNo = "SELECT * FROM MDUBusRoutes ORDER BY Bus_No_Type ASC" ; 
    SQLiteDatabase db = this.getWritableDatabase(); 
    Cursor CursorBusNo = db.rawQuery(SelectBusNo, null); 
    if (CursorBusNo.moveToFirst()) 
    { 
     do { 
      BusNoList.add(CursorBusNo.getString(1)); 
     } 
     while (CursorBusNo.moveToNext()); 
    } 
    CursorBusNo.close(); 
    db.close(); 
} 
catch (Exception ignored){ 
    Log.d(TAG,"Error:..........................................................................." + ignored); 


} 
return BusNoList; 
} 

public List<String> getBusRoute()                //ThisIsWorkingAsExpected(SoDontChange) 
{ 
    List<String> BusRouteList = new ArrayList<String>(); 

    try { 
     String SelectBusRoute = "SELECT * FROM MDUBusRoutes" ; 
     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor CursorBusRoute = db.rawQuery(SelectBusRoute, null); 
     if (CursorBusRoute.moveToFirst()) { 
      do { 
       BusRouteList.add(CursorBusRoute.getString(2)); 
      } 
      while (CursorBusRoute.moveToNext()); 
     } 
     CursorBusRoute.close(); 
     db.close(); 
    } 
    catch (Exception ignored){ 

    } 
    return BusRouteList; 
} 

}

我的输出看起来像：

微调项：

我的输出显示表中的每一行的第三列，但我想添加在表中的列。当我在旋转选择anothor项，列表视图应显示的列，其中Bus_No_Type =（spinneritemselected）

For example: 


If I select B7 from spinner then listview should display values from b7Route1 to b7Route17. Which is already added in table. 

我是新到Android。请帮我我很长一段时间尝试这个

谢谢！

Answer 1

更改您的onItemSelected如下。

@Override 
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
    String bus = (String) getItem(position); 
    DbHandler db = new DbHandler(getApplicationContext()); 
    List<String> BusRouteList = db.getBusRoute(bus); 
    ArrayAdapter<String> lvAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, BusRouteList); 
    listView.setAdapter(lvAdapter); 
} 

和getBusRoute如下。

public List<String> getBusRoute(String bus)                //ThisIsWorkingAsExpected(SoDontChange) 
{ 
    List<String> BusRouteList = new ArrayList<String>(); 

    try { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor CursorBusRoute = db.query("MDUBusRoutes", new String[] {"From_Loc","To_Loc","Route_1","Route_2","Route_3","Route_4","Route_5","Route_6","Route_7","Route_8","Route_9","Route_10","Route_11","Route_12","Route_13","Route_14","Route_15"}, "Bus_No_Type=?", new String[] { bus }, null, null, null, null); 
     if (CursorBusRoute.moveToFirst()) { 
      do { 
       BusRouteList.add(CursorBusRoute.getString(2)); 
      } 
      while (CursorBusRoute.moveToNext()); 
     } 
     CursorBusRoute.close(); 
     db.close(); 
    } 
    catch (Exception ignored){ 

    } 
    return BusRouteList; 
}