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我正在尝试使用微调器通过我的数据库实现用户搜索。

我有车队和车辆(车队包含车辆)。我有一个车队列表作为一个微调器,一个车辆列表作为另一个。

默认情况下,我希望将车队设置为“全部”,并且将车辆设置为显示所有车辆(目前是这种情况),但是当车队输入更改为特定的车辆时,例如车队 1,车辆微调器应更新因此[这将通过 SQLite 数据库搜索来实现,但我认为问题不在这里]。

当车队微调器数据发生更改时,如何创建监听器?

vehicleSpinner = (Spinner) findViewById(R.id.vehicleSpinner); 
      String selected = (String)fleetSpinner.getSelectedItem();
      ArrayAdapter<String> adapter5 = null;
      if(selected == "All"){
          //show all vehicles
          adapter5 = new ArrayAdapter<String>(this, R.layout.sherlock_spinner_item, vehicleArrayListString);

  }else{
      String vehiclesInFleetQuery = "SELECT * FROM " + Database.TABLE_VEHICLE + " WHERE " + Database.COLUMN_FLEET + "='" + selected +"'";
      Log.i(TAG,"QUERY: "+ vehiclesInFleetQuery);
      Cursor cursor = Database.listOfVehiclesDesired(query);


        if(cursor.moveToFirst()){
            do {
             String addToList = cursor.getString(cursor.getColumnIndex(Database.COLUMN_VEHICLE_ID));
             vehicleArrayFleet.add(addToList);
            } while (cursor.moveToNext());
        }else{//error on fleet search, no vehicles in fleet
            vehicleArrayFleet = vehicleArrayListString;
            builderContinue.setMessage("Selected Fleet(" + selected + ") had zero associated vehicles").setTitle("Error").show();
        }


        if (cursor != null && !cursor.isClosed()) {
            System.out.println("Closed");
            cursor.close();
        }

       adapter5 = new ArrayAdapter<String>(this, R.layout.sherlock_spinner_item, vehicleArrayFleet);
  }


 adapter5.setDropDownViewResource(R.layout.sherlock_spinner_dropdown_item);
  vehicleSpinner.setAdapter(adapter5);
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1 回答 1

1

您需要为车队微调器设置一个 OnItemSelectedListener。您可以在http://start-jandroid.blogspot.com/2011/01/android-spinner-example.html找到一个示例。从车队微调器中的侦听器,您可以设置车辆微调器的选定项目。

于 2013-07-24T03:21:54.330 回答