how to use the sharedpreferences to store the name in one activity and use them in another activity?

Question

i use this code to store the name and password in login activity!

 public void main_login(View v)
{
    Name = name.getText().toString();
    Password = password.getText().toString();
    BackGround b = new BackGround();
    b.execute(Name, Password);


    context = getApplicationContext();
    sp = getSharedPreferences("identifier", context.MODE_PRIVATE);
    SharedPreferences.Editor Ed= sp.edit();
    Ed.putString("Name",name.getText().toString()).commit();
    Ed.putString("Password",  password.getText().toString()).commit();
   // startActivity(new Intent(Login.this,Reg_Token_Id.class));
    startActivity(new Intent(this, Reg_Token_Id.class));

}

i got the name ,password,token ushing sharedprefences,and sending them to php file to insert the id in the table.i am able to make a toast and able to see the name ,token ,password, but not able to send them to php file

can anyone help me to fix this issue?

Answer 1

You need to use this instead of PreferenceManager.getDefaultSharedpreferences()

SharedPreference sp = context.getSharedPreferences("Identifier",Context.MODE_PRIVATE)

and call shared preferences with this "Identifier" in another activity

Answer 2

This is the example to save data in sharedpreferences and get the data back from sharedpreferences, hope it will help you out. Try using your own preference name instead of using PreferenceManager.getDefaultSharedPreferences(getBaseContext())

 public class BChooserPreferences {
        private final static String FILE = "b_chooser_prefs";
        private final static String FOLDER_NAME = "folder_name";
        private SharedPreferences preferences;

        public BChooserPreferences(Context context) {
            preferences = context.getSharedPreferences(FILE, Context.MODE_PRIVATE);
        }

        /**
         * Set the folder name to be used for all files or temporary files
         * @param folderName
         */
        public void setFolderName(String folderName){
            SharedPreferences.Editor editor = preferences.edit();
            editor.putString(FOLDER_NAME, folderName);
            editor.commit();
        }

        public String getFolderName(){
            return preferences.getString(FOLDER_NAME, "bichooser");
        }

    }

Answer 3

Change your login.java as below.

SharedPreferences sp = getSharedPreferences("identifier", Context.MODE_PRIVATE);
SharedPreferences.Editor Ed= sp.edit();
Ed.putString("Name", Name).commit();
Ed.putString("Password", Password).commit();

You can use any word you like for identifier. using this identifier you can retrieve SharedPreferences in your second activity as follows.

SharedPreferences  mPrefs = getSharedPreferences("identifier", Context.MODE_PRIVATE);
String Name = mPrefs.getString("Name", null);
String Password = mPrefs.getString("Password", null);

Using above you will be able to deal with SharedPreferences correctly.

I have changed your backend php code as bellow. Compare it with your code.

<?php
 require "init.php";

    $token = $_POST["Token"];
    $Name = $_POST["Name"];
    $Password = $_POST["Password"];
    $user_id;

    $Sql = "SELECT * FROM `user_info` 
        WHERE `name`='".$Name."' AND 
        `password`='".$Password."';";

    $result = mysqli_query($con, $Sql);
    $retrive = array();
    while($row = mysqli_fetch_array($result))
    {
     $user_id =  $row['id']; 
    }

    $query ="INSERT INTO user(Token,Employeeid) Values ('".$token."', 
    '".$user_id."')";

    if (mysqli_query($con, $query)) {
    echo "New record created successfully";
    } else {
    echo "Error: " . $query . "<br>" . mysqli_error($con);
    }
    mysqli_close($con);
?>

If you have any doubt feel free to comment.