Java 如果会话为true，则将用户信息发送到下一个活动-android

我尝试了下面的代码，在其中我试图创建用户会话，直到它注销应用程序。问题是我试图将用户信息发送到页面

profile.java

。我试着使用intent extras，但失败了。有什么建议吗

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());
        }
    }
}

 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;
    }
}

DataBaseWrapper.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());
        }
    }
}

 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;
    }
}

公共类DatabaseWrapper扩展了SQLiteOpenHelper{
私有静态最终字符串标记=DatabaseWrapper.class.getSimpleName（）；
//对于用户表
公共静态最终字符串FUNTUBE=“User”；
公共静态最终字符串FUNTUBE\u ID=“\u ID”；
公共静态最终字符串FUNTUBE\u UNAME=“\u username”；
公共静态最终字符串FUNTUBE\u EMAIL=“\u EMAIL”；
公共静态最终字符串FUNTUBE\u PASSWORD=“\u PASSWORD”；
公共静态最终字符串FUNTUBE\u FNAME=“\u FNAME”；
公共静态最终字符串FUNTUBE_LNAME=“_LNAME”；
公共静态最终字符串FUNTUBE\u PHONE=“\u PHONE”；
公共静态最终字符串FUNTUBE\u COUNTRY=“\u COUNTRY”；
公共静态最终字符串FUNTUBE_-GENDER=“_-GENDER”；
公共静态最终字符串FUNTUBE\u VIDEOPATH=“\u VIDEOPATH”；
公共静态最终字符串FUNTUBE\u BDAY=“\u BDAY”；
公共静态最终字符串FUNTUBE_YEAR=“_YEAR”；
公共静态最终字符串FUNTUBE\u INTEREST=“\u INTEREST”；
公共静态最终字符串FUNTUBE_religation=“_religation”；
公共静态最终字符串FUNTUBE\u ABOUT=“\u ABOUT”；
公共静态最终字符串FUNTUBE_QUOTE=“_qoute”；
公共静态最终字符串FUNTUBE\u JOB=“\u JOB”；
@凌驾
public void onCreate（SQLiteDatabase db）{
execSQL（创建数据库）；
}
私有静态最终字符串数据库\u NAME=“FunTubeApplication.db”；
私有静态最终int数据库_VERSION=1；
//创建SQLite语句
私有静态最终字符串数据库\u CREATE=“CREATE table”+FUNTUBE
+（“+FUNTUBE_ID+”整数主键自动递增，”
+FUNTUBE_UNAME+“文本不为空，”
+FUNTUBE_电子邮件+“文本不为空，”
+FUNTUBE_密码+“文本不为空，”
+FUNTUBE_FNAME+“文本不为空，”
+FUNTUBE_LNAME+“文本不为空，”
+FUNTUBE_PHONE+“文本不为空，”
+FUNTUBE_COUNTRY+“文本不为空，”
+FUNTUBE_性别+“文本不为空，”
+FUNTUBE\u VIDEOPATH+“文本不为空，”
+FUNTUBE_BDAY+“文本不为空，”
+FUNTUBE_YEAR+“文本不为空，”
+FUNTUBE_利息+“文本不为空，”
+FUNTUBE_+文本不为空
+FUNTUBE_关于+“文本不为空，”
+FUNTUBE_QUOTE+“文本不为空，”
+FUNTUBE_作业+“文本不为空”；
公共数据库包装器（上下文）{
super（上下文、数据库名称、null、数据库版本）；
}
@凌驾
public void onUpgrade（SQLiteDatabase db，int-oldVersion，int-newVersion）{
如果（新版本>旧版本）{
db.execSQL（“如果存在删除表”+FUNTUBE）；
db.execSQL（“如果存在删除表”+FUNTUBE\u UPLOADFILE）；
onCreate（db）；
}
}
/**
*从数据库获取用户数据
*/
公共HashMap getUserDetails（）{
HashMap用户=新建HashMap（）；
String selectQuery=“SELECT*FROM”+FUNTUBE；
SQLiteDatabase db=this.getReadableDatabase（）；
Cursor Cursor=db.rawQuery（selectQuery，null）；
//移到第一排
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（“_性别”，cursor.getString（8））；
user.put（“\u videopath”，cursor.getString（9））；
user.put（“bday”，cursor.getString（10））；
user.put（“_year”，cursor.getString（11））；
user.put（“_interest”，cursor.getString（12））；
user.put（“_”，cursor.getString（13））；
user.put（“_about”，cursor.getString（14））；
user.put（“_quote”，cursor.getString（15））；
user.put（“_作业”，cursor.getString（16））；
}
cursor.close（）；
db.close（）；
//返回用户
Log.d（标记，“从Sqlite获取用户：”+user.toString（））；
返回用户；
}
}

用你的方式是可能的，但我还有其他东西可以帮助你

做一件事创建公共静态变量并在该变量中设置数据。之后，从profile类使用这个变量，就像使用全局变量一样

像 路一号

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);

二路

优先存储数据。。

---

从登录名设置首选项数据并从配置文件中获取首选项数据。

使用您的方式是可能的，但我还有其他东西可以帮助您

做一件事创建公共静态变量并在该变量中设置数据。之后，从profile类使用这个变量，就像使用全局变量一样

像 路一号

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);

二路

优先存储数据。。

---

从登录名中设置首选项数据并从配置文件中获取首选项数据。

如果profile.java中的代码非常完美，那么哪些代码可以获取额外数据？@SameerDonga-its`welcometxt.setText（“欢迎”+extras.getString（“name”）.toUpperCase（）`您要这样做吗？@SameerDonga我在登录并重定向到配置文件活动时已经这样做了。它可以工作，但现在我想在会话设置为true时执行此操作。是否仍要使用

putExtra

执行此操作？如果是这样的话，发布你的

profile

类可能会有所帮助。如果你的代码在profile.java中非常完美，哪一个会得到额外的数据？@SameerDonga-its`welcometext.setText（“Welcom”）