更改基於另一個微調控制器的微調選項

Question

我想通過使用微調控制器來實現用戶搜索。

我有車隊和車輛（車隊包含車輛）。我有一個車隊列表作爲一個微調和一個車輛列表作爲另一個。

默認情況下，我希望車隊設置爲「全部」，車輛一個顯示所有車輛（目前情況下），但是當車隊輸入更改爲特定車隊時，比如說fleet1，汽車微調應該相應地更新[這將通過SQLite數據庫搜索實施，但我不認爲這個問題在這裏]。

如何爲艦隊微調器數據更改時創建偵聽器？

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); 

Answer 1

您需要爲艦隊微調器設置一個OnItemSelectedListener。你可以在http://start-jandroid.blogspot.com/2011/01/android-spinner-example.html找到一個例子。從機羣微調器中的聽衆，您可以設置車輛微調器的選定項目。