Question

我有登录活动，我想在其余的活动中使用登录用户名和密码。我尝试过很多东西但没有运气

Answer 1

一种方法是使用共享偏好：

save it in Preference in Activity C


SharedPreferences.Editor editor = getSharedPreferences("your_pref_name", MODE_PRIVATE).edit();
 editor.putString("extra_name", extra_value);
 editor.commit();

get it in Activity A

SharedPreferences prefs = getSharedPreferences("your_pref_name", MODE_PRIVATE); 

  String name = prefs.getString(""extra_name"", "");

Answer 2

SharedPreferences settings = getSharedPreferences(ClassName.PREFS_NAME, 0); // 0 - for private mode
            SharedPreferences.Editor editor = settings.edit();

//Set "hasLoggedIn" to true
            editor.putBoolean("hasLoggedIn", true);
            editor.putString("user_name",userid);
            editor.putString("pass_word",pass);
// Commit the edits!
            editor.commit();

使用相同的代码来获取数据...例如editor.getString（“user_name”，0）;

希望它有效...对不起，如果我错了..我也是初学者......

Answer 3

您可以使用SharedPreference保存和读取数据，如下所示：

var newFlightPath = [];
myLatLngs.forEach(function(item){
  newFlightPath.push({
   lat:item.latitude,
   lng:item.longitude
})
})

Answer 4

我认为用于存储用户数据的击球方式会创建单独的类和存储数据。下面我将为您提供如何使用单独的类的示例代码

import android.content.Context;
import android.content.SharedPreferences;

/**
 * Created by Kintan Patel on 03-Aug-16.
 */
public class SessionHelper {

   public static final String IS_LOGIN = "isLogin";
    private static final String USER_NAME = "userName";
    private static final String PASSWORD = "password";
    private static final String SHARE_PREF = "spDemo";
    private static SessionHelper mSessionHelper;
    private Context context;
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor editor;

    public SessionHelper(Context context) {
        this.context = context;
        sharedPreferences = context.getSharedPreferences(SHARE_PREF, Context.MODE_PRIVATE);
        editor = sharedPreferences.edit();
    }


       public void createLoginSession(String userName, String password) {
           editor.putString(USER_NAME, userName);
           editor.putString(PASSWORD, password);
           editor.apply();
       }

       public String getUserName() {
           return sharedPreferences.getString(USER_NAME, "");

    }

}

使用SessionHelper类创建您想要使用的对象，如

SessionHelper helper = new SessionHelper(context); helper.createLoginSession("userName","123");//add user data into shareprefrances String userName = helper.getUserName(); //retrive userName from shareprefrances

您可以在任何活动中使用 getUserName（）方法。

如何在各种活动中保存和使用共享Prefrences值

4 个答案: