Question

我的android应用程序有两个单独的类，用于将数据插入到sqllite数据库

带有此构造函数的DataBaseAdapterClass

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

}

我正在使用另一个名为webservise的类从web服务获取数据并插入sqllite数据库，我使用这个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另存为成员变量：

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

然后使用：

DatabaseAdapter da = new DatabaseAdapter(mContext);

用于数据库构造函数的Android getBaseContext（）

1 个答案: