訪問Java類方法

Question

可能重複：
How to acess java script variable in java class in android

這裏是我的代碼

public class UserValidation extends Activity{ 


    private WebView mAppView; 
    private DroidGap mGap; 
    enter code here 

    public UserValidation(DroidGap gap, WebView view) { 
     mAppView = view; 
     mGap = gap; 
    } 




    public String getImeiNumber() { 


     TelephonyManager tm = (TelephonyManager) mGap 
       .getSystemService(Context.TELEPHONY_SERVICE); 
     String imeiId = tm.getDeviceId(); 

    return imeiId; 
    } 

從其他類訪問

String imei=userValidation.getimei(); 

給出NullPointerException。

Answer 1

我不認爲該活動可以創建編程？

public UserValidation(DroidGap gap, WebView view) { 
      mAppView = view; 
      mGap = gap; 
} 

在這裏

public String getImeiNumber() { 


     TelephonyManager tm = (TelephonyManager) mGap 
       .getSystemService(Context.TELEPHONY_SERVICE); 
     String imeiId = tm.getDeviceId(); 

     return imeiId; 
} 

應該

public String getImeiNumber() { 


     TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); 
     String imeiId = tm.getDeviceId(); 

     return imeiId; 

} 

Answer 2

初始化類的對象後，你可以接取方法和沒有 需要在UserValidation類擴展活動。

UserValidation userValidation = new UserValidation (Pass your parameter); 
String imei=userValidation.getimei();