android - 用于数据库构造函数的 Android getBaseContext()

Question

我有 2 个单独的类供我的 android 应用程序将数据插入到 sqllite 数据库

1. 带有此构造函数的 DataBaseAdapterClass

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

2. 我正在使用另一个名为 webservise 的类从 Web 服务获取数据并插入到 sqllite 数据库中，因为我使用了这个 Asyntask 类。

   public class FoodCityWebService {
   
       String myValue = "";
       private final String NAMESPACE="http://tempuri.org/";
       private final String URL = "xxxxxx:xxxx/Service1.asmx?WSDL";
   
       public FoodCityWebService(){
   
       }
   
       public FoodCityWebService(String param1){
   
       }
   
       public String getValueFromService()
       {
           myValue =  new web().execute("df").toString();
           return myValue;
       }
   
   
   
       public class web extends AsyncTask<String,Integer, String>
       { 
             String result = "";
             final String SOAP_ACTION="http://tempuri.org/GetUserName";
           @Override
           protected String doInBackground(String... params) {
   
               final String METHOD_NAME="GetUserName";
   
               SoapObject request=new SoapObject(NAMESPACE, METHOD_NAME);
               request.addProperty("name","Bread");
               SoapSerializationEnvelope envelop=new SoapSerializationEnvelope(SoapEnvelope.VER11);//ver11 version
               envelop.dotNet=true;//only for dotnet       
               envelop.setOutputSoapObject(request);
   
                HttpTransportSE httptransportse=new HttpTransportSE(URL);
                String x ="";
               try{
               httptransportse.call(SOAP_ACTION, envelop);
   
               SoapPrimitive response=(SoapPrimitive)envelop.getResponse();
   
   
   
                   x = response.toString();
   
                   DatabaseAdapter da = new DatabaseAdapter(); // *ERROR!!!*           
                   da.addItem(new Item("CityItem1","Bread",Double.parseDouble(x),"222"));
   
   
   
               }catch (Exception e) {
   
                   e.printStackTrace();
   
               }
   
               return x;
   
   
           }
   
   
           } 
   
   
    }
   

如何从 databseAdapter 类创建对象？

Answer 1

如何从 databseAdapter 类创建对象？

一种基本方法是将 Context 添加到构造函数的参数中并将其保存为成员变量：

private Context mContext;
public FoodCityWebService(Context context){
    mContext = context;
}

然后使用：

DatabaseAdapter da = new DatabaseAdapter(mContext);