I have tried all the possible solution given in other answers about shared preference, and still was not able to solve, thus made this question.
I have been using these files
Config.java
public class Config {
//URL to our login.php file
public static final String LOGIN_URL = "http://192.168.211.1/Remedcu/login.php";
public static final String KEY_NAME = "Name";
public static final String KEY_EMAIL = "Email";
public static final String KEY_PASSWORD = "Password";
//If server response is equal to this that means login is successful
public static final String LOGIN_SUCCESS = "success";
//Keys for Sharedpreferences
//This would be the name of our shared preferences
public static final String SHARED_PREF_NAME = "iamhere";
//This would be used to store the email of current logged in user
public static String EMAIL_SHARED_PREF = null;
//We will use this to store the boolean in sharedpreference to track user is loggedin or not
public static String LOGGEDIN_SHARED_PREF = "loggedin";
}
and Login.java
public class Login extends AppCompatActivity {
private static final String TAG = "LoginActivity";
private Vibrator vib;
Animation animShake;
private EditText signupInputName, signupInputPassword;
private TextInputLayout signupInputLayoutName,
signupInputLayoutPassword;
private Button btnSignUp;
ProgressDialog progress;
private static final String LOGIN_URL = "http://192.168.211.1/Remedcu/login.php";
public static final String KEY_NAME = "Username";
public static final String KEY_PASSWORD = "Password";
TextView textView;
private boolean loggedIn = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.signup_input_layout_name);
signupInputLayoutPassword = (TextInputLayout) findViewById(R.id.signup_input_layout_password);
textView = (TextView) findViewById(R.id.textView2);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Login.this, Registration.class);
startActivity(intent);
}
});
signupInputName = (EditText) findViewById(R.id.signup_input_name);
signupInputPassword = (EditText) findViewById(R.id.signup_input_password);
btnSignUp = (Button) findViewById(R.id.btn_signup);
animShake = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.shakei);
vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
btnSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
submitForm();
//Intent intent=new Intent(Intent.ACTION_VIEW);
}
});
}
private void submitForm() {
final String Name = signupInputName.getText().toString().trim();
final String Password=signupInputPassword.getText().toString().trim();
StringRequest stringRequest = new StringRequest(Request.Method.POST,LOGIN_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if(response.equalsIgnoreCase("Invalid credentials")) {
Toast.makeText(Login.this, response, Toast.LENGTH_SHORT).show();
}
//String LOGIN_SUCCESS = "success";
if(response.equalsIgnoreCase("success")){
final String Use ="Welcome "+Name;
Toast.makeText(getApplicationContext(),Use,Toast.LENGTH_SHORT).show();
//Creating a shared preference
SharedPreferences sharedPreferences = Login.this.getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
//Creating editor to store values to shared preferences
SharedPreferences.Editor editor = sharedPreferences.edit();
//Adding values to editor
editor.putBoolean(Config.LOGGEDIN_SHARED_PREF, true);
editor.putString(Config.EMAIL_SHARED_PREF, Name);
//Saving values to editor
editor.apply();
Toast.makeText(getApplicationContext(), "The data is saved as "+Config.EMAIL_SHARED_PREF,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Login.this, MapsActivity.class);
startActivity(intent);
}//else{
//If the server response is not success
//Displaying an error message on toast
// Toast.makeText(Login.this, "Invalid credentials", Toast.LENGTH_LONG).show();
//}
// Intent intent = new Intent(Registration.this, MainActivity.class);
// startActivity(intent);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(Login.this,error.toString(),Toast.LENGTH_LONG).show();
}
}){
@Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String, String>();
params.put(KEY_NAME,Name);
params.put(KEY_PASSWORD,Password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
if (!checkName()) {
signupInputName.setAnimation(animShake);
signupInputName.startAnimation(animShake);
vib.vibrate(120);
return;
}
if (!checkPassword()) {
signupInputPassword.setAnimation(animShake);
signupInputPassword.startAnimation(animShake);
vib.vibrate(120);
return;
}
signupInputLayoutName.setErrorEnabled(false);
signupInputLayoutPassword.setErrorEnabled(false);
// Toast.makeText(getApplicationContext(),
// "You are logged in !!", Toast.LENGTH_SHORT).show();
}
private boolean checkName() {
if (signupInputName.getText().toString().trim().isEmpty()) {
signupInputLayoutName.setErrorEnabled(true);
signupInputLayoutName.setError(getString(R.string.err_msg_name));
signupInputName.setError(getString(R.string.err_msg_required));
return false;
}
signupInputLayoutName.setErrorEnabled(false);
return true;
}
private boolean checkPassword() {
if (signupInputPassword.getText().toString().trim().isEmpty()) {
signupInputLayoutPassword.setError(getString(R.string.err_msg_password));
requestFocus(signupInputPassword);
return false;
}
signupInputLayoutPassword.setErrorEnabled(false);
return true;
}
private static boolean isValidEmail(String email) {
return !TextUtils.isEmpty(email) &&
android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
}
private void requestFocus(View view) {
if (view.requestFocus()) {
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
}
}
@Override
protected void onResume() {
super.onResume();
//In onresume fetching value from sharedpreference
SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
//Fetching the boolean value form sharedpreferences
loggedIn = sharedPreferences.getBoolean(Config.LOGGEDIN_SHARED_PREF, false);
//If we will get true
if (loggedIn) {
//We will start the Profile Activity
Intent intent = new Intent(Login.this, MapsActivity.class);
startActivity(intent);
}
}}
In the Login.java after I commit the changes to the editor, I just wanted to check the values if they are saved or not.
Thus the below code is there:
Toast.makeText(getApplicationContext(), "The data is saved as "+Config.EMAIL_SHARED_PREF,Toast.LENGTH_SHORT).show();
But whenever I run the program, after logging in, the toast is always "The data is saved as null"
Is there any way around it?
You need to get the email, that is, the value of the key EMAIL_SHARED_PREF from sharedPreferences:
String email = sharedPreferences.getString(Config.EMAIL_SHARED_PREF, "NOT FOUND");
'NOT FOUND' is the value that will be set to email if EMAIL_SHARED_PREF is not initialized with a value in SharedPreferences. Next, you can just call email in your toast maker.
Toast.makeText(getApplicationContext(), "The data is saved as "+ email,Toast.LENGTH_SHORT).show();