i m working on an application and i want to make user login only when he/she logouts his previous session but i m unable to do it. whenever i close my program and re-open it. it directs to Homepage again even if i had'nt logout. plz
package in.co.medimap.www.medimap;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import static in.co.medimap.www.medimap.R.layout.login;
/**
* Created by sony on 28-04-2016.
*/
public class login extends Activity {
TextView signup_text;
Button login_button;
EditText PHONE_NO,PASSWORD;
AlertDialog.Builder builder;
public static final String MyPREFERENCE ="Myprefs";
public static final String PHONE="phone";
public static final String PASS="password";
SharedPreferences sharedPreferences;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.login);
signup_text=(TextView)findViewById(R.id.sign_up);
signup_text.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
startActivity(new Intent(login.this,register.class));
}
});
PHONE_NO=(EditText)findViewById(R.id.phone_no);
PASSWORD=(EditText)findViewById(R.id.password);
login_button=(Button)findViewById(R.id.login_button);
login_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String ph = PHONE_NO.getText().toString();
String p=PASSWORD.getText().toString();
if (ph.equals("")||p.equals("")) {
builder = new AlertDialog.Builder(login.this);
builder.setTitle("Something went wrong...");
builder.setMessage("Please fill all the fields...");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
else
{
//see from here
sharedPreferences = getSharedPreferences(MyPREFERENCE,Context.MODE_PRIVATE );
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(PHONE, ph);
editor.putString(PASS, p);
editor.commit();
BackgroundTask backgroundTask = new BackgroundTask(login.this);
backgroundTask.execute("login",ph,p);
}
}
});
}
}
this is my homeactivity where after logging user goes
and i want that if i hadn't logout then whenever i open my app it should start from here
package in.co.medimap.www.medimap;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class HomeActivity extends Activity {
Button Logout = null;
TextView textView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Logout = (Button) findViewById(R.id.Logout);
textView = (TextView) findViewById(R.id.welcome_txt);
String message = getIntent().getStringExtra("message");
textView.setText(message);
Logout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences(login.MyPREFERENCE, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.commit();
Intent intent = new Intent(HomeActivity.this,MainActivity.class);
startActivity(intent);
}
});
}
}
If you want logout to happen each time user leaves the application, why don't you just do it manually?
you've already set Logout buttons setOnClickListener so just do this:
#Override
protected void onPause() {
super.onPause();
if(Logout != null) {
Logout.callOnClick();
}
}
This means every time user leaves this activity it will logout.
make sure you handle cases where if they leave activity but go to a different activity on your page, it doesn't log out.
=========== EDIT ===========
I'm guessing your login activity is the main activity that starts when application opens so just put this in onCreate before you perform any other tasks. right after setContentView, you should do this.
SharedPreferences sharedPreferences = getSharedPreferences(login.MyPREFERENCE, Context.MODE_PRIVATE);
String phone = sharedPreferences.getString(PHONE, "");
String pass = sharedPreferences.getString(PASS, "");
if(!phone.isEmpty() && !pass.isEmpty()) {
// this means ID and passwords are already saved so just start your home activity here
startActivity(new Intent(context, MainActivity.class));
finish();
}
In your MainActivity:
Just read the values from SharedPreferences and login if you have to.
Hope this helps.
========== EDIT 2
Also, your Logout should look like this. Don't use commmit or clear. put empty values and use apply
Logout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences(login.MyPREFERENCE, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(PHONE, "");
editor.putString(PASS, "");
editor.apply();
Intent intent = new Intent(HomeActivity.this,MainActivity.class);
startActivity(intent);
}
});
Related
I want this code to run just once after installing the app.
Page 1 has a button and after clicking it, the user will be directed to page 2.
Page 2 is the disclaimer page and after checkboxes are marked and agree button is clicked, the user is directed to the home page.
When the user clicks for the second time, this disclaimer page should not open again.
I tried to modify my code for it, but I couldn't because of the button as I'm not sure how to use it.
Page 1
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
public Button btn_Shap;
public void first(){
btn_Shap = (Button)findViewById(R.id.btn_Shap);
btn_Shap.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent btn = new Intent(MainActivity.this, disclaimer.class);
startActivity(btn);
}
});
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
first();
}
}
Page 2
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class disclaimer extends AppCompatActivity {
public Button button2;
public Button button1;
public void second(){
button2 = (Button)findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent btn = new Intent(disclaimer.this, home.class);
startActivity(btn);
}
});
}
public void first(){
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent btn = new Intent(disclaimer.this, MainActivity.class);
startActivity(btn);
}
});
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_disclaimer);
second();
first();
}
}
Inside the desclaimer page store a boolean value using shared preference and check it before open the desclaimer page. like this
Inside the Desclaimer page
SharedPreferences settings = getSharedPreferences("prefs", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("firstRun", false);
editor.commit();
Before open the desclaimer page
SharedPreferences settings = getSharedPreferences("prefs", 0);
boolean firstRun = settings.getBoolean("firstRun", true);
if ( firstRun )
{
//Open desclaimer
}else{
//Do not open desclaimer
}
This question already has answers here:
Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 4 years ago.
I Build My App And It Shows A Sucessfull Build But When I tried to run in my device then it shows your app keep stoping open again and this happen in only login activity if any one help me to fix this so please help me
my Login Activity Code
package com.eassycars.www.licencespot;
import android.content.Intent;
import android.os.Build;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class Activity_Login extends AppCompatActivity {
private EditText inputEmail, inputPassword;
private FirebaseAuth mAuth;
private ProgressBar progressBar;
private Button singups,forgotpass,logins;
RelativeLayout really1, really2;
Handler handler = new Handler();
Runnable runnable = new Runnable() {
#Override
public void run() {
really1.setVisibility(View.VISIBLE);
really2.setVisibility(View.VISIBLE);
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Get Firebase auth instance
mAuth = FirebaseAuth.getInstance();
if (mAuth.getCurrentUser() != null) {
startActivity(new Intent(Activity_Login.this, MainActivity.class));
finish();
}
// set the view now
setContentView(R.layout.activity__login);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
singups = (Button) findViewById(R.id.singups);
logins = (Button) findViewById(R.id.logins);
forgotpass = (Button) findViewById(R.id.forgotpass);
//Get Firebase auth instance
mAuth = FirebaseAuth.getInstance();
singups.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(Activity_Login.this, singup.class));
}
});
forgotpass.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(Activity_Login.this, ForgotPassword.class));
}
});
really1 = (RelativeLayout) findViewById(R.id.rellayl);
really2 = (RelativeLayout) findViewById(R.id.really2);
handler.postDelayed(runnable, 2000);
logins.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String email = inputEmail.getText().toString();
final String password = inputPassword.getText().toString();
if (TextUtils.isEmpty(email)) {
Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)) {
Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
progressBar.setVisibility(View.VISIBLE);
//authenticate user
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(Activity_Login.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
progressBar.setVisibility(View.GONE);
if (!task.isSuccessful()) {
// there was an error
if (password.length() < 6) {
inputPassword.setError(getString(R.string.minimum_password));
} else {
Toast.makeText(Activity_Login.this, getString(R.string.auth_failed), Toast.LENGTH_LONG).show();
}
} else {
Intent intent = new Intent(Activity_Login.this, MainActivity.class);
startActivity(intent);
finish();
}
}
});
}
});
}
}
These are my login activity code and cant able to find error and android studio also shows that you don't have any error but there is an error that's my app keep stopping when i use my login screen.
I build An Login Activity using Firebase
Please post your error message from logcat.
If calling Handler from a Thread leads to NullPointerException,
Try to call your handler in onCreate
public class LoginActivity extends Activity {
#Override
public void onCreate(Bundle bundle){
super.onCreate(bundle);
//move this HERE!!
new Handler().post(new Runnable() {
#Override
public void run() {
// Code here will run in UI thread
}
});
}
}
Can someone please help me edit the following code so that it saves the info typed into the edittext and then once the app is relaunched it will automatically display the text that was saved in the edittext field. I have tried SharedPreferences tutorials but so far I have not been able to get it working.
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText txtLink;
Button btnOpenLink;
String defaultLink;
String secondLink;
public static final String MyPREFERENCES = "MyPrefs" ;
public static final String Name = "nameKey";
SharedPreferences sharedpreferences;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
defaultLink = "http://";
secondLink = ".whatver.com";
txtLink = (EditText) findViewById(R.id.editText);
btnOpenLink = (Button) findViewById(R.id.button);
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
btnOpenLink.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
String server = txtLink.getText().toString();
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(Name, server);
editor.commit();
if(!TextUtils.isEmpty(server)){
Intent intent=new Intent(MainActivity.this,webactivity.class);
intent.setData(Uri.parse(defaultLink+server+secondLink));
startActivity(intent);
}else{
Toast.makeText(MainActivity.this, "Please enter your server name.", Toast.LENGTH_LONG).show();
}
}
});
}
}
Verify the stored preferences and load them if any avaliable, after that display them in the textview
Example:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
defaultLink = "http://";
secondLink = ".whatver.com";
txtLink = (EditText) findViewById(R.id.editText);
btnOpenLink = (Button) findViewById(R.id.button);
checkIfPreferencesAvaliable();
if(defaultLink!=null && secondLink!=null){
txtLink.setText(defaultLink+secondLink);
}
defaultLink = "http://";
secondLink = ".whatver.com";
void checkIfPreferencesAvaliable(){
SharedPreferences preferences = getPreferences(Activity.MODE_PRIVATE);
defaultLink = preferences.getStr("mydefaultLink", null);
secondLink = preferences.getStr("mysecondLink", null);
}
In your onCreate(), check if you have already have values in your preferences-
String savedVal = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE).getString(Name, null);
if(savedVal == null){ //This means you don't have the saved values in your prefs file
//Do whatever you want to
} else{
//Use "savedVal" anyway you want
}
I fixed it by calling this
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
txtLink.setText(sharedpreferences.getString(Name, ""));
I have an application that displays a splash screen then a 'Showonce' screen, I have used app prefs and a boolean "user_accept" to decide wether the screen gets displayed or not, trouble no matter if the boolean = true it still shows the page, please see my code for the pages, any help greatly appreciated :).
package com.overclockerz.webtest;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.view.Window;
import android.widget.Toast;
public class SplashScreen extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.splash_layout);
final SharedPreferences settings = getSharedPreferences("APP_PREFS",
MODE_PRIVATE);
final boolean hasAgreed = settings.getBoolean("user_accepted", false);
Handler handler = new Handler();
// run a thread after 2 seconds to start the home screen
handler.postDelayed(new Runnable() {
#Override
public void run() {
if (hasAgreed == false){
Intent intent = new Intent(SplashScreen.this, ShowOnce.class);
SplashScreen.this.startActivity(intent);
Toast.makeText(getApplicationContext(), "DEBUG: USER HAS NOT ACCEPTED",Toast.LENGTH_LONG).show();
}else if (hasAgreed == true){
Toast.makeText(getApplicationContext(), "DEBUG: USER HAS ACCEPTED",Toast.LENGTH_LONG).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();
}
finish();
}
}, 2000); // time in milliseconds (1 second = 1000 milliseconds) until the run() method will be called
}
}
package com.overclockerz.webtest;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;
public class ShowOnce extends Activity implements OnClickListener {
Button show_options_dialog, accept_button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.show_once);
show_options_dialog = (Button) findViewById(R.id.show_options_dialog);
accept_button = (Button) findViewById(R.id.accept_button);
show_options_dialog.setOnClickListener(this);
accept_button.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (v == show_options_dialog){
Intent intent = new Intent(getApplicationContext(), SettingScreen.class);
startActivity(intent);
}
else if (v == accept_button){
SharedPreferences settings = getSharedPreferences("APP_PREFS",
MODE_PRIVATE);
SharedPreferences.Editor prefEditor = settings.edit();
prefEditor.putBoolean("user_accept", true);
Toast.makeText(getApplicationContext(), "DEBUG: USER CLICKED ACCEPT", Toast.LENGTH_LONG).show();
prefEditor.commit();
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();
}
}
}
you are saving user_accept and checking for user_accepted
Please use public static final String to avoid such problems:
public static final String USER_ACCEPTED = "accepted";
.........
prefEditor.putBoolean(USER_ACCEPTED , true);
.........
settings.getBoolean(USER_ACCEPTED , false);
I have a SharedPreference in this .java File; towards the bottom you can see I save the values to the SharedPreferences GB_PREFERENCES_BENCH, and GB_PREFERENCES_FLIES. How do I use these values in another activity? See the second code example for how I want to use it.
package com.creativecoders.gymbuddy;
import com.creativecoders.gymbuddy.R;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.TextView;
public class Benchmark extends Activity {
public static final String GB_PREFERENCES = "Prefs";
public static final String GB_PREFERENCES_BENCH = "Bench";
public static final String GB_PREFERENCES_FLIES = "Flies";
SharedPreferences gBValues;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_benchmark);
gBValues = getSharedPreferences(GB_PREFERENCES, Context.MODE_PRIVATE);
}
public void onStart() {
super.onStart();
findViewById(R.id.button5).setOnClickListener(new handleButton5());
}
class handleButton5 implements OnClickListener {
public void onClick(View v) {
EditText editText1 = (EditText)findViewById(R.id.editText1);
String sWeight = editText1.getText().toString();
final double dWeight = Double.parseDouble(sWeight);
EditText editText2 = (EditText)findViewById(R.id.editText2);
String sPush = editText2.getText().toString();
final double dPush = Double.parseDouble(sPush);
EditText editText3 = (EditText)findViewById(R.id.editText3);
String sSit = editText3.getText().toString();
final double dSit = Double.parseDouble(sSit);
EditText editText4 = (EditText)findViewById(R.id.editText4);
String sPull = editText4.getText().toString();
final double dPull = Double.parseDouble(sPull);
double dBench = (((Math.floor(dWeight*.0664))*10)-10)+dPush;
double dFlies = (Math.floor(((Math.floor(dBench*.6)/10)*10)));
int iBench = (int)dBench;
int iFlies = (int)dFlies;
Editor editor1 = gBValues.edit();
editor1.putInt(GB_PREFERENCES_BENCH, iBench);
editor1.commit();
Editor editor2 = gBValues.edit();
editor2.putInt(GB_PREFERENCES_FLIES, iFlies);
editor2.commit();
}
}
}
Here is how I want to use it; (specifically in the on create method to set a TextView's text to the value in the SharePreference)
package com.creativecoders.gymbuddy;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
public class Upper100Start extends Activity {
public static final String GB_PREFERENCES = "Prefs";
public static final String GB_PREFERENCES_CURLS = "Curls";
SharedPreferences gBValues;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.upper100start);
if (gBValues.contains(GB_PREFERENCES_CURLS)){
TextView TextView2 = (TextView)findViewById(R.id.textView2);
TextView2.setText(gBValues.getString(GB_PREFERENCES_CURLS, ""));
}
}
public void onStart() {
super.onStart();
findViewById(R.id.button2).setOnClickListener(new handleButton2());
findViewById(R.id.button3).setOnClickListener(new handleButton3());
}
class handleButton2 implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent(Upper100Start.this, Upper101.class);
startActivity(intent);
}
}
class handleButton3 implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent(Upper100Start.this, Main.class);
startActivity(intent);
}
}
}
The shared preferences are accessible throughout your application, so you can read them from any activity in the application.
Storing a key/value pair in activity A:
SharedPreferences settings = getSharedPreferences("mysettings",
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString("mystring", "wahay");
editor.commit();
Reading this value from another activity:
SharedPreferences settings = getSharedPreferences("mysettings",
Context.MODE_PRIVATE);
String myString = settings.getString("mystring", "defaultvalue");
You can find more information at http://developer.android.com/guide/topics/data/data-storage.html#pref