java - 如果 session 为真，则将用户信息发送到下一个 Activity - android

Question

我尝试过以下代码，其中我尝试创建用户 session ，直到它注销应用程序。问题是我正在尝试将用户信息发送到页面profile.java。我尝试使用 Intent 附加功能，但失败了。如有任何建议，请。

login.java

public class login extends AppCompatActivity {
    private FunTubeOperations FunTubeDBOperations;
    private DatabaseWrapper db;
    private SessionManager session;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.login);
        final AlertDialog ad = new AlertDialog.Builder(this).create();
        Button login = (Button) findViewById(R.id.login);
        Button reg = (Button) findViewById(R.id.reg);
        FunTubeDBOperations = new FunTubeOperations(this);
        FunTubeDBOperations.open();
       // SQLite database handler
        db = new DatabaseWrapper(getApplicationContext());

        // Session manager
       session = new SessionManager(getApplicationContext());

        // Check if user is already logged in or not
        if (session.isLoggedIn()) {


            // User is already logged in. Take him to main activity
            Intent intent = new Intent(login.this, profile.class);
            //intent.putExtra("name", user);
            startActivity(intent);
            finish();
        }
       try {
          login.setOnClickListener(new View.OnClickListener() {
           public void onClick(View arg0) {
             EditText email = (EditText) findViewById(R.id.email);
             EditText password = (EditText) findViewById(R.id.password);
              if (email != null && password !=null) {
               String em=email.getText().toString();
               String pwd=password.getText().toString();
               String user=  FunTubeDBOperations.loginUsers(em, pwd);
                  if(user!=null)
                    {
                   session.setLogin(true);
                   Intent intent = new Intent(login.this, profile.class);
                   intent.putExtra("name", user);
                   startActivity(intent);
                   finish();
                   }}
            });

        } catch (Exception er) {
            ad.setMessage(er.toString());
        }
    }
}

DataBaseWrapper.java

 public class DatabaseWrapper extends SQLiteOpenHelper {
    private static final String TAG = DatabaseWrapper.class.getSimpleName();


    //For user table
    public static final String FUNTUBE = "User";
    public static final String FUNTUBE_ID = "_id";
    public static final String FUNTUBE_UNAME = "_username";
    public static final String FUNTUBE_EMAIL = "_email";
    public static final String FUNTUBE_PASSWORD = "_password";
    public static final String FUNTUBE_FNAME = "_fname";
    public static final String FUNTUBE_LNAME = "_lname";
    public static final String FUNTUBE_PHONE = "_phone";
    public static final String FUNTUBE_COUNTRY = "_country";
    public static final String FUNTUBE_GENDER = "_gender";
    public static final String FUNTUBE_VIDEOPATH = "_videopath";
    public static final String FUNTUBE_BDAY = "_bday";
    public static final String FUNTUBE_YEAR = "_year";
    public static final String FUNTUBE_INTEREST = "_interest";
    public static final String FUNTUBE_RELIGION = "_religion";
    public static final String FUNTUBE_ABOUT = "_about";
    public static final String FUNTUBE_QUOTE = "_qoute";
    public static final String FUNTUBE_JOB = "_job";

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(DATABASE_CREATE);
        }


    private static final String DATABASE_NAME = "FunTubeApplication.db";
    private static final int DATABASE_VERSION = 1;

    // creation SQLite statement
    private static final String DATABASE_CREATE = "create table " + FUNTUBE
            + "(" + FUNTUBE_ID + " integer primary key autoincrement, "

            + FUNTUBE_UNAME + " text not null,"
            + FUNTUBE_EMAIL + " text not null,"
            + FUNTUBE_PASSWORD + " text not null,"
            + FUNTUBE_FNAME + " text not null,"
            + FUNTUBE_LNAME + " text not null,"
            + FUNTUBE_PHONE + " text not null,"
            + FUNTUBE_COUNTRY + " text not null,"
            + FUNTUBE_GENDER + " text not null,"
            + FUNTUBE_VIDEOPATH + " text not null,"
            + FUNTUBE_BDAY + " text not null,"
            + FUNTUBE_YEAR + " text not null,"
            + FUNTUBE_INTEREST + " text not null,"
            + FUNTUBE_RELIGION + " text not null,"
            + FUNTUBE_ABOUT + " text not null,"
            + FUNTUBE_QUOTE + " text not null,"
            + FUNTUBE_JOB + " text not null)";



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


    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        if (newVersion > oldVersion) {
            db.execSQL("DROP TABLE IF EXISTS " + FUNTUBE);
            db.execSQL("DROP TABLE IF EXISTS " + FUNTUBE_UPLOADFILE);
            onCreate(db);
        }


    }

    /**
     * Getting user data from database
     */
    public HashMap<String, String> getUserDetails() {
        HashMap<String, String> user = new HashMap<String, String>();
        String selectQuery = "SELECT  * FROM " + FUNTUBE;

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        // Move to first row
        cursor.moveToFirst();
        if (cursor.getCount() > 0) {
            user.put("_username", cursor.getString(1));
            user.put("_email", cursor.getString(2));
            user.put("_password", cursor.getString(3));
            user.put("_fname", cursor.getString(4));
            user.put("_lname", cursor.getString(5));
            user.put("_phone", cursor.getString(6));
            user.put("_country", cursor.getString(7));
            user.put("_gender", cursor.getString(8));
            user.put("_videopath", cursor.getString(9));
            user.put("_bday", cursor.getString(10));
            user.put("_year", cursor.getString(11));
            user.put("_interest", cursor.getString(12));
            user.put("_religion", cursor.getString(13));
            user.put("_about", cursor.getString(14));
            user.put("_quote", cursor.getString(15));
            user.put("_job", cursor.getString(16));
        }
        cursor.close();
        db.close();
        // return user
        Log.d(TAG, "Fetching user from Sqlite: " + user.toString());

        return user;
    }
}

Answer 1

可以使用你的方式，但我还有其他东西也可以帮助你。

做一件事创建公共(public)静态变量并在该变量中设置数据。之后，从您的配置文件类中像全局变量一样使用此变量。

喜欢方法一。

login.java

public static String UserName = null;
// set user name after login in above variable
UserName = "tempUser";

// using intent go to profile page without passing any extra data
// before call intent check that UserName should not be null;

profile.java

// get user name
TextView username;
username.setText(Login.UserName);

方法二

优先存储数据..通过登录设置偏好数据并从个人资料中获取偏好数据。