Unexpected response code in volley library and unable to retrieve json string

Unexpected response code in volley library and unable to retrieve json string - android

I'm doing the json parsing over the POSTMAN API WHICH WE CREATED and I'm trying to POST Login details to POSTMAN i.e:- username and password and if the details are correct POSTMAN will return response back in JSON STRING. When I run this im not able to get any sort of data in back. It showing me the UNEXPECTED RESPONSE CODE 400,406,404
MainActivity.java
package com.dropouts.copylogin;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private EditText email;
private EditText password;
private Button login_register;
private RequestQueue requestQueue;
private StringRequest request;
private TextView tv;
private static String URL="http://192.168.1.18/rakyesh/test/rest/rest/login";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
email= (EditText) findViewById(R.id.user);
password=(EditText)findViewById(R.id.pass);
login_register=(Button)findViewById(R.id.loginbtn);
requestQueue= Volley.newRequestQueue(this);
login_register.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
request = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
Log.e("Response of 192 returns username",">"+jsonObject.getString("username"));
if (jsonObject.names().get(0).equals("username")) {
Toast.makeText(getApplicationContext(), "SUCCESS"+ jsonObject.getString("username"),Toast.LENGTH_LONG).show();
startActivity(new Intent(getApplicationContext(), Welcome.class));
} else {
Toast.makeText(getApplicationContext(), "Error" + jsonObject.getString("error"), Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("Content-Type","application/json; charset=utf-8");
hashMap.put("email", email.getText().toString());
hashMap.put("password", password.getText().toString());
return hashMap;
}
};
requestQueue.add(request);
}
});
}
}
MANIFEST.XML
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.dropouts.copylogin">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Welcome"/>
</application>
</manifest>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:orientation="vertical"
tools:context="com.dropouts.copylogin.MainActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/user"
android:hint="username"
android:inputType="text"
android:maxLines="1"
android:singleLine="true"
android:layout_marginTop="50dp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:ems="10"
android:maxLines="1"
android:singleLine="true"
android:id="#+id/pass"
android:hint="Pass"
android:layout_marginTop="42dp"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="LOGIN/REGISTER"
android:id="#+id/loginbtn"
/>
<TextView
android:layout_marginTop="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/txt"
android:textAppearance="?android:textAppearanceLarge"
android:layout_below="#+id/loginbtn"
/></LinearLayout>
WELCOME.JAVA
package com.dropouts.copylogin;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
/**
* Created by Pankaj on 3/17/2016.
*/
public class Welcome extends Activity {
Button logout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome_activity);
logout= (Button) findViewById(R.id.log_out);
logout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(),MainActivity.class));
}
});
}
}
welcome_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Welcome"
android:id="#+id/wlcmtxt"
android:textAppearance="?android:textAppearanceLarge"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Logout"
android:id="#+id/log_out"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>

Here are error code doc in HttpStatus.java.
int SC_NOT_FOUND = 404;
int SC_BAD_REQUEST = 400;
int SC_NOT_ACCEPTABLE;
I submit your request not meet the standards.These code below should be put in method 'getHeaders()' but not in 'getParams()'.
hashMap.put("Content-Type","application/json; charset=utf-8");
Here are a demo using StringRequest by post in volley.
https://gist.github.com/mombrea/7250835

You are passing application/json as Content-Type in your header and passing string data.If you want to post json data it is better to use JsonObjectRequest instead . Please try removing Content-Type header from HashMap.it might help.
UPDATE:
JSONObject params = new JSONObject();
//build your params
JsonObjectRequest jsObjRequest = new JsonObjectRequest
(Request.Method.POST, url, params, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
//parse the response for the result
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
});

Related

Codeblock in android Handler not being executed

I am uploading video to a localhost webpage. My code is using a Handler (the syntax of which is working in a different class for signup & login to the app.
However when I run the code in the emulator it creates the handler, run the next line, then skips over the code in the handler.post section. (I can see handler appears to be deprecated in the documentation but i'm too far down this road to change now).
Any suggestions would be very much appreciated. (I know there are probably other issues in the code and better ways to do what i'm trying to achieve, I'm just using this as a learning exercise).
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="#+id/captureBtn"
android:layout_width="120dp"
android:layout_height="60dp"
android:layout_centerVertical="true"
android:layout_gravity="bottom"
android:text="Capture Video"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
build.gradle
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="#+id/captureBtn"
android:layout_width="120dp"
android:layout_height="60dp"
android:layout_centerVertical="true"
android:layout_gravity="bottom"
android:text="Capture Video"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
MainActivity
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
// Storage Permissions
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
Button Upload;
private final String fileURI = "/storeage/emulated/0/DCIM/Camera/VID_20210424_141744.mp4";
private static final String serverUri = "http://192.168.0.116/racewatch/upload.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Upload = findViewById(R.id.captureBtn);
Upload.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (ActivityCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
Handler handler = new Handler();
System.out.println("Hi from here");
handler.post(new Runnable() {
#Override
public void run() {
// Start of upload thread
//Creating array for parameters
String[] field = new String[4];
field[0] = "username";
field[1] = "userid";
field[2] = "lat";
field[4] = "lon";
//Creating array for data
String[] data = new String[4];
data[0] = "patsky";
data[1] = "21";
data[2] = "53.6";
data[3] = "-6.1";
// instantiate a client - should be a singleton
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.readTimeout(10, TimeUnit.SECONDS)
.build();
// /storeage/emulated/0/DCIM/Camera/VID_20210424_141744.mp4
RequestBody requestBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart(field[0], data[0])
.addFormDataPart(field[1], data[1])
.addFormDataPart(field[2], data[2])
.addFormDataPart(field[3], data[3])
.addFormDataPart("file", "test.mp4", RequestBody.create(MediaType.parse("video/mp4"), new File(fileURI)))
.build();
Request request = new Request.Builder()
.url(serverUri)
.post(requestBody)
.build();
client.newCall(request).enqueue(new Callback() {
#Override
public void onFailure(final Call call, final IOException e) {
//Toast.makeText(MainActivity.this, "Error in file upload", Toast.LENGTH_SHORT).show();
Log.e("file uuuupload", "exception", e);
}
#Override
public void onResponse(final Call call, final Response response) throws IOException {
String phpans = response.body().string();//reponse body can be only accessed once
//Toast.makeText(MainActivity.this, phpans, Toast.LENGTH_SHORT).show();
System.out.println("Error messssage" + phpans);
if (!response.isSuccessful()) {
//Toast.makeText(MainActivity.this, "File uploaded successfully", Toast.LENGTH_SHORT).show();
System.out.println("Error messaage" + phpans);
}
// Upload successful
}
});
}
});
} else {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{
Manifest.permission.READ_EXTERNAL_STORAGE}, 44);
}
} // end of onClick
});
} // end of onCreate
}
AndroidManifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.uploadtoserverexample">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:usesCleartextTraffic="true"
android:theme="#style/Theme.UploadToServerExample">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

login button not responding or displaying anything

I'm currently making an app for my thesis project and I used YouTube to watch several tutorials. Now, I followed a lot of videos and did what the narrator said, but when I run my project, my login button is not responding for some reason that I don't know. I added a picture of the event log. I hope it will help you guys to understand.
Here is my loginRequest.java:
package com.example.user.login_02;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;
import java.util.HashMap;
import java.util.Map;
public class LoginReq extends StringRequest{
private static final String LOGIN_REQ_URL = "http://10.0.2.2/login.php";
private Map<String, String> params;
public LoginReq(String pincode, Response.Listener<String> listener) {
super(Method.POST, LOGIN_REQ_URL, listener, null);
params = new HashMap<>();
params.put("pincode", pincode);
}
#Override
public Map<String, String> getParams() {
return params;
}
}
my mainActivity.java:
package com.example.user.login_02;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText etUsername = (EditText) findViewById(R.id.etUsername);
final EditText etPincode = (EditText) findViewById(R.id.etPincode);
final Button bLogin = (Button) findViewById(R.id.bLogin);
bLogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String pincode = etPincode.getText().toString();
final String username = etUsername.getText().toString();
//final int id = etId.getInt().toString();
Response.Listener<String> responseListener = new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
boolean success = jsonObject.getBoolean("success");
if (success) {
//String id = jsonObject.getString("id");
Intent intent = new Intent(MainActivity.this, UserActivity.class);
intent.putExtra("username", username);
MainActivity.this.startActivity(intent);
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("Login Failed")
.setNegativeButton("Retry", null)
.create()
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
LoginReq loginReq = new LoginReq(pincode, responseListener);
RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
queue.add(loginReq);
}
});
}
}
my userActivity.java:
package com.example.user.login_02;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
public class UserActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user);
final EditText etUsername = (EditText) findViewById(R.id.etUsername);
Intent intent = getIntent();
String username = intent.getStringExtra("username");
etUsername.setText(username);
}
}
my xml for loginActivity:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.user.login_02.MainActivity">
<Button
android:id="#+id/bLogin"
android:layout_width="177dp"
android:layout_height="47dp"
android:layout_marginTop="58dp"
android:text="LOGIN"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/etPincode"
app:layout_constraintVertical_bias="0.13"
tools:layout_editor_absoluteX="59dp"
android:layout_below="#+id/etPincode"
android:layout_centerHorizontal="true" />
<EditText
android:id="#+id/etUsername"
android:layout_width="310dp"
android:layout_height="42dp"
android:ems="10"
android:hint="User Name"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.039"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="27dp" />
<EditText
android:id="#+id/etPincode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="#+id/etUsername"
android:layout_alignLeft="#+id/etUsername"
android:layout_alignRight="#+id/etUsername"
android:layout_alignStart="#+id/etUsername"
android:layout_below="#+id/etUsername"
android:layout_marginTop="28dp"
android:ems="10"
android:hint="Pincode"
android:inputType="textPassword" />
</RelativeLayout>

Null object reference error when trying to open new activity on Android? [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 5 years ago.
This is my code for the XML activity, the code to open a new activity triggers a null exception error on this project but when I try the same code on another project it works and runs well on the emulator, why is this error persisting?
The error produced at the error log is:
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.swaziprocurement.sppraapp/com.swaziprocurement.sppraapp.Main2Activity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.widget.Button.setOnClickListener(android.view.View$OnClickListener)'
on a null object reference
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.swaziprocurement.sppraapp.MainActivity">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="User Registration Form"
android:textSize="20dp"
android:textStyle="bold"
android:id="#+id/textView"
android:layout_centerHorizontal="true"
android:gravity="center"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/EditTextFullName"
android:layout_below="#+id/textView"
android:layout_marginTop="20dp"
android:hint="Enter Your Full Name"
android:gravity="center"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/EditTextEmail"
android:layout_below="#+id/EditTextFullName"
android:layout_marginTop="20dp"
android:inputType="textEmailAddress"
android:hint="Enter Your Email"
android:gravity="center"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/EditTextPassword"
android:layout_below="#+id/EditTextEmail"
android:layout_marginTop="20dp"
android:inputType="textPassword"
android:hint="Enter Your Password"
android:gravity="center"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Click Here To Register"
android:layout_below="#+id/EditTextPassword"
android:id="#+id/ButtonRegister"
android:layout_marginTop="20dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Login Menu"
android:id="#+id/button2"
android:layout_below="#+id/ButtonRegister"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
Java Code:
package com.swaziprocurement.sppraapp;
import android.app.ProgressDialog;
import android.content.Intent;
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.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
Button Register,buttonOpen;
EditText FullName,Email,Password;
RequestQueue requestQueue;
String NameHolder,PasswordHolder,EmailHolder;
ProgressDialog progressDialog;
String HttpUrl="https://android-examples.000webhostapp.com/User-Registration.php";
Boolean CheckEditText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FullName=(EditText)findViewById(R.id.EditTextFullName);
Email=(EditText)findViewById(R.id.EditTextEmail);
Password=(EditText)findViewById(R.id.EditTextPassword);
Register=(Button)findViewById(R.id.ButtonRegister);
buttonOpen=(Button)findViewById(R.id.button2);
requestQueue= Volley.newRequestQueue(MainActivity.this);
progressDialog=new ProgressDialog(this);
Register.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
CheckEditTextIsEmptyOrNot();
if (CheckEditText)
UserRegistration();
else{
Toast.makeText(MainActivity.this,"Please fill all form fields",Toast.LENGTH_SHORT).show();
}
}
});
buttonOpen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
openAct();
}
});
}
public void UserRegistration(){
// Showing progress dialog at user registration time.
progressDialog.setMessage("Please Wait, We are Inserting Your Data on Server");
progressDialog.show();
// Creating string request with post method.
StringRequest stringRequest = new StringRequest(Request.Method.POST, HttpUrl,
new Response.Listener<String>() {
#Override
public void onResponse(String ServerResponse) {
// Hiding the progress dialog after all task complete.
progressDialog.dismiss();
// Showing Echo Response Message Coming From Server.
Toast.makeText(MainActivity.this, ServerResponse, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError volleyError) {
// Hiding the progress dialog after all task complete.
progressDialog.dismiss();
// Showing error message if something goes wrong.
Toast.makeText(MainActivity.this, volleyError.toString(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() {
// Creating Map String Params.
Map<String, String> params = new HashMap<String, String>();
// Adding All values to Params.
// The firs argument should be same sa your MySQL database table columns.
params.put("User_Email", EmailHolder);
params.put("User_Password", PasswordHolder);
params.put("User_Full_Name", NameHolder);
return params;
}
};
// Creating RequestQueue.
RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
// Adding the StringRequest object into requestQueue.
requestQueue.add(stringRequest);
}
public void CheckEditTextIsEmptyOrNot(){
// Getting values from EditText.
NameHolder = FullName.getText().toString().trim();
EmailHolder = Email.getText().toString().trim();
PasswordHolder = Password.getText().toString().trim();
// Checking whether EditText value is empty or not.
if(TextUtils.isEmpty(NameHolder) || TextUtils.isEmpty(EmailHolder) || TextUtils.isEmpty(PasswordHolder))
{
// If any of EditText is empty then set variable value as False.
CheckEditText = false;
}
else {
// If any of EditText is filled then set variable value as True.
CheckEditText = true ;
}
}
public void openAct(){
startActivity(new Intent(MainActivity.this,Main2Activity.class));
}
}
This is the second activity
package com.swaziprocurement.sppraapp;
import android.app.ProgressDialog;
import android.content.Intent;
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.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.Map;
public class Main2Activity extends AppCompatActivity {
Button button,LoginButton;
EditText Email,Password;
Boolean CheckEditText;
RequestQueue requestQueue;
String EmailHolder,PasswordHolder;
ProgressDialog progressDialog;
String HttpUrl = "https://android-examples.000webhostapp.com/user_login.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
button =(Button)findViewById(R.id.button);
progressDialog=new ProgressDialog(this);
LoginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
CheckEditTextIsEmptyOrNot();
if (CheckEditText) {
UserLogin();
} else {
Toast.makeText(Main2Activity.this, "Please fill all form fields.", Toast.LENGTH_LONG).show();
}
}
});
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent =new Intent(Main2Activity.this,MainActivity.class);
startActivity(intent);
}
});
}
public void CheckEditTextIsEmptyOrNot() {
// Getting values from EditText.
EmailHolder = Email.getText().toString().trim();
PasswordHolder = Password.getText().toString().trim();
// Checking whether EditText value is empty or not.
if (TextUtils.isEmpty(EmailHolder) || TextUtils.isEmpty(PasswordHolder)) {
// If any of EditText is empty then set variable value as False.
CheckEditText = false;
} else {
// If any of EditText is filled then set variable value as True.
CheckEditText = true;
}
}
public void UserLogin() {
// Showing progress dialog at user registration time.
progressDialog.setMessage("Please Wait");
progressDialog.show();
// Creating string request with post method.
StringRequest stringRequest = new StringRequest(Request.Method.POST, HttpUrl,
new Response.Listener<String>() {
#Override
public void onResponse(String ServerResponse) {
// Hiding the progress dialog after all task complete.
progressDialog.dismiss();
// Matching server responce message to our text.
if(ServerResponse.equalsIgnoreCase("Data Matched")) {
// If response matched then show the toast.
Toast.makeText(Main2Activity.this, "Logged In Successfully", Toast.LENGTH_LONG).show();
// Finish the current Login activity.
finish();
// Opening the user profile activity using intent.
Intent intent = new Intent(Main2Activity.this, Main3Activity.class);
// Sending User Email to another activity using intent.
intent.putExtra("UserEmailTAG", EmailHolder);
startActivity(intent);
}
else {
// Showing Echo Response Message Coming From Server.
Toast.makeText(Main2Activity.this, ServerResponse, Toast.LENGTH_LONG).show();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError volleyError) {
// Hiding the progress dialog after all task complete.
progressDialog.dismiss();
// Showing error message if something goes wrong.
Toast.makeText(Main2Activity.this, volleyError.toString(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() {
// Creating Map String Params.
Map<String, String> params = new HashMap<String, String>();
// Adding All values to Params.
// The firs argument should be same sa your MySQL database table columns.
params.put("User_Email", EmailHolder);
params.put("User_Password", PasswordHolder);
return params;
}
};
// Creating RequestQueue.
RequestQueue requestQueue = Volley.newRequestQueue(Main2Activity.this);
// Adding the StringRequest object into requestQueue.
requestQueue.add(stringRequest);
}
}
The XML for the second Activity
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.swaziprocurement.sppraapp.Main2Activity">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/textView"
android:textSize="20dp"
android:textStyle="bold"
android:text="Volley User Login System"
android:gravity="center"
android:layout_marginTop="20dp"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="Enter Your Email"
android:gravity="center"
android:id="#+id/editText_Email"
android:layout_below="#+id/textView"
android:layout_marginTop="20dp"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="Enter Your Email"
android:gravity="center"
android:id="#+id/editText_Password"
android:inputType="textPassword"
android:layout_below="#+id/editText_Email"
android:layout_marginTop="20dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="CLICK HERE TO LOGIN"
android:id="#+id/button_login"
android:layout_below="#id/editText_Password"
android:layout_marginTop="20dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Registration Menu"
android:id="#+id/button"
android:layout_below="#+id/button_login"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>

initialize your LoginButton,
LoginButton =(Button)findViewById(R.id.button_login);
than use
LoginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
CheckEditTextIsEmptyOrNot();
if (CheckEditText) {
UserLogin();
} else {
Toast.makeText(Main2Activity.this, "Please fill all form fields.", Toast.LENGTH_LONG).show();
}
}
});

You need to initialize your button, you are calling OnClickListener on null reference
LoginButton =(Button)findViewById(R.id.button_login);
Before calling LoginButton.setOnClickListener() initilize your login button.

Android SharedPreferences not removed until app is restarted

I'm stucked with this problem.
In my app I use SharedPrefManager as a singleton class, in order to keep some "session" information. In this simple example app I just save the user's name and a boolean that indicates whether or not the user is logged in to skip the login screen if already logged, or to show it if not.
When starting the app, after the splashscreen, the LoginActivity is started.
At this point, if the user has already logged in before (without logging out later, that means the boolean value of isuseradded SharedPreferences variable is true), the user is redirected to the MainActivity, otherwise he sees the login form, where he can insert username and password and make a REST API request to a remote server.
If the login is correct, the MainActivity starts and simply shows the name of the user, taken from the response JSON obtained by the remote login REST API call.
Now, here is my problem: I want to implement a simple logout feature that deletes (or changes, as in this test app) all the information stored by SharedPreferences and takes the user back to the LoginActivity.
But when I click logout, the values for SharedPreferences are updated only in MainActivity, while in LoginActivity they remain the same as before, so when the user is redirected to LoginActivity, the isusedadded shared preference is still true, and the user is redirected back to MainActivity.
But SharedPrefManager class is a singleton, so its values should be the same in every part of the app, because only one instance of it exists, so why do I have this behavior?
You can test the app by downloading the full app code here and using these credentials for login:
Username: 52346
Password: 32fjueM1 (case sensitive)
Here follows my code.
App.java:
package mypackage.sharedprefapp;
import android.app.Application;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
public class App extends Application
{
private RequestQueue mRequestQueue;
private static App mInstance;
#Override
public void onCreate()
{
super.onCreate();
mInstance = this;
}
public static synchronized App getInstance()
{
return mInstance;
}
// This method returns the queue containing GET/POST requests
public RequestQueue getRequestQueue()
{
if(mRequestQueue == null)
{
mRequestQueue = Volley.newRequestQueue(getApplicationContext());
}
return mRequestQueue;
}
// This method adds a GET/POST request to the queue of requests
public <T> void addToRequestQueue(Request<T> req)
{
getRequestQueue().add(req);
}
}
SplashActivity.java
package mypackage.sharedprefapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class SplashActivity extends AppCompatActivity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Intent intent = new Intent(this, LoginActivity.class);
startActivity(intent);
finish();
}
}
LoginActivity.java
package mypackage.sharedprefapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
public class LoginActivity extends AppCompatActivity
{
private static final String TAG = "LoginActivity";
Button loginButton;
EditText userIDInput, passwordInput;
TextView loginErrorMsg, title;
LinearLayout bgLayout;
SharedPrefManager sharedPrefManager;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
sharedPrefManager = SharedPrefManager.getInstance(this);
Log.i("HERE", "LoginActivity onCreate: "+sharedPrefManager.isUserAdded());
}
#Override
protected void onResume()
{
super.onResume();
sharedPrefManager = SharedPrefManager.getInstance(this);
Log.i("HERE", "LoginActivity onResume: "+sharedPrefManager.getUserName());
// if the user is already logged in
if(sharedPrefManager.isUserAdded())
{
Log.i(TAG, "User is logged in");
// if the device is connected to the internet
if(Utils.isDeviceOnline(this))
{
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
// if the device is offline
else
{
Log.i(TAG, "Internet connection is not available");
}
}
// if the user is not logged in
else
{
Log.i(TAG, "User is NOT logged in");
setContentView(R.layout.activity_login);
title = (TextView) findViewById(R.id.title);
loginErrorMsg = (TextView) findViewById(R.id.login_errorText);
userIDInput = (EditText) findViewById(R.id.login_id_paziente);
passwordInput = (EditText) findViewById(R.id.login_password);
loginButton = (Button) findViewById(R.id.login_submitButton);
bgLayout = (LinearLayout) findViewById(R.id.login_parentLayout);
// Bind a custom click listener to the login button
loginButton.setOnClickListener(new LoginButtonClickListener(this));
// Bind a custom click listener to the background layout
// so that the soft keyboard is dismissed when clicking on the background
bgLayout.setOnClickListener(new LoginBackgroundClickListener());
}
}
}
LoginButtonClickListener.java
package mypackage.sharedprefapp;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class LoginButtonClickListener implements View.OnClickListener
{
private Context context;
private SharedPrefManager sharedPrefManager;
public LoginButtonClickListener(Context c)
{
this.context = c;
}
#Override
public void onClick(View v)
{
sharedPrefManager = SharedPrefManager.getInstance(context);
// if internet connection is available
if(Utils.isDeviceOnline(context))
{
// Verify login credentials from DB
doLogin();
}
else {}
}
// check login data with REST API
private void doLogin()
{
final String paziente_id = ((EditText)((Activity)context).findViewById(R.id.login_id_paziente)).getText().toString();
final String paziente_password = ((EditText)((Activity)context).findViewById(R.id.login_password)).getText().toString();
StringRequest stringRequest = new StringRequest
(
Request.Method.POST,
"http://www.stefanopace.net/iCAREServer/api/v1/index.php/login",
new Response.Listener<String>()
{
#Override
public void onResponse(String s)
{
try
{
JSONObject obj = new JSONObject(s);
if(!obj.getBoolean("error"))
{
String name = obj.getString("nome");
sharedPrefManager.addUser(name);
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
}
else
{
Toast.makeText(context, "Error on JSON response", Toast.LENGTH_LONG).show();
}
}
catch(JSONException e)
{
e.printStackTrace();
}
}
},
new Response.ErrorListener()
{
#Override
public void onErrorResponse(VolleyError volleyError)
{
Toast.makeText(context, volleyError.getMessage(), Toast.LENGTH_LONG).show();
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError
{
Map<String, String> params = new HashMap<>();
params.put("id_paziente", paziente_id);
params.put("password", paziente_password);
return params;
}
};
App.getInstance().addToRequestQueue(stringRequest);
}
}
LoginBackgroundClickListener.java
package mypackage.sharedprefapp;
import android.view.View;
public class LoginBackgroundClickListener implements View.OnClickListener
{
#Override
public void onClick(View v)
{
Utils.hideSoftKeyboard(v);
}
}
MainActivity.java
package mypackage.sharedprefapp;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
{
private static final String TAG = "MainActivity";
TextView personName;
SharedPrefManager sharedPrefManager;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
sharedPrefManager = SharedPrefManager.getInstance(this);
setContentView(R.layout.activity_main);
personName = (TextView) findViewById(R.id.person_name);
Log.i(TAG, "Value: "+sharedPrefManager.isUserAdded());
personName.setText(sharedPrefManager.getUserName());
}
#Override
protected void onResume()
{
super.onResume();
sharedPrefManager = SharedPrefManager.getInstance(this);
Log.w("MainActivity", "onResume");
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.mainmenu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch(item.getItemId())
{
// Logout button has been pressed
case R.id.logout_action:
{
Log.i("Logout pressed", "Logout button has been pressed!");
final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Are you sure you want to logout?");
alertDialogBuilder.setPositiveButton
(
"Yes",
new DialogInterface.OnClickListener()
{
#Override
public void onClick(DialogInterface arg0, int arg1)
{
boolean success = sharedPrefManager.removeDataFromSharedPreference();
// if the operation is OK
if(success)
{
// go to the login activity
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
startActivity(intent);
finish();
}
else
{
Toast.makeText(getApplicationContext(), "Error during logout", Toast.LENGTH_LONG).show();
}
}
}
);
alertDialogBuilder.setNegativeButton
(
"No",
new DialogInterface.OnClickListener()
{
#Override
public void onClick(DialogInterface arg0, int arg1)
{}
}
);
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
return true;
}
}
return super.onOptionsItemSelected(item);
}
}
SharedPrefManager.java
package mypackage.sharedprefapp;
import android.content.Context;
import android.content.SharedPreferences;
public final class SharedPrefManager
{
private static final String TAG = "SharedPrefManager";
private SharedPreferences sharedPreferences;
private SharedPreferences.Editor editor;
private static SharedPrefManager mInstance;
private static final String SHARED_PREF = "sharedprefs";
private static final String KEY_IS_USER_ADDED = "isuseradded";
public static final String KEY_USER_NAME = "username";
private SharedPrefManager(Context context)
{
sharedPreferences = context.getSharedPreferences(SHARED_PREF, Context.MODE_PRIVATE);
editor = sharedPreferences.edit();
sharedPreferences.registerOnSharedPreferenceChangeListener(new LocalSharedPreferencesChangeListener());
}
public static SharedPrefManager getInstance(Context context)
{
if(mInstance == null)
{
mInstance = new SharedPrefManager(context);
}
return mInstance;
}
// add an user to the shared preferences
public boolean addUser(String name)
{
editor.putString(KEY_USER_NAME, name);
editor.putBoolean(KEY_IS_USER_ADDED, true);
return editor.commit();
}
public boolean removeDataFromSharedPreference()
{
editor.putString(KEY_USER_NAME, "HELLO");
editor.putBoolean(KEY_IS_USER_ADDED, false);
return editor.commit();
}
public String getUserName()
{
return sharedPreferences.getString(KEY_USER_NAME, "");
}
public boolean isUserAdded()
{
return sharedPreferences.getBoolean(KEY_IS_USER_ADDED, false);
}
}
Utils.java
package mypackage.sharedprefapp;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AlertDialog;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
public class Utils
{
public static void hideSoftKeyboard(View view)
{
InputMethodManager inputMethodManager = (InputMethodManager) view.getContext().getSystemService(Activity.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
// This method checks if the device is connected to the Internet
public static boolean isDeviceOnline(final Context context)
{
final ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if(connectivityManager != null)
{
final NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
boolean isOnline = (networkInfo != null && networkInfo.isConnectedOrConnecting());
if(!isOnline)
{
AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
alertDialog.setCancelable(false);
alertDialog.setTitle("Error");
alertDialog.setMessage("Internet is not available");
alertDialog.setPositiveButton("Try again", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
// Reload the Activity
Intent intent = ((Activity) context).getIntent();
((Activity) context).finish();
context.startActivity(intent);
}
});
alertDialog.show();
}
return isOnline;
}
return false;
}
}
LocalSharedPreferencesChangeListener
package mypackage.sharedprefapp;
import android.content.SharedPreferences;
import android.util.Log;
public class LocalSharedPreferencesChangeListener implements SharedPreferences.OnSharedPreferenceChangeListener
{
#Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
{
Log.i("HERE", key);
}
}
activity_login.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context=".LoginActivity"
android:padding="0dp">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/scrollView"
android:layout_gravity="center_horizontal">
<LinearLayout
android:id="#+id/login_parentLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:clickable="true">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#mipmap/ic_launcher"
android:layout_gravity="center_horizontal"
android:layout_marginTop="50dp"
android:layout_marginBottom="30dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/app_name"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:layout_marginBottom="30dp"
android:singleLine="false"
android:padding="5dp"
android:textSize="30sp" />
<EditText
android:id="#+id/login_id_paziente"
android:layout_width="match_parent"
android:layout_height="40dp"
android:inputType="number"
android:ems="10"
android:hint="Username"
android:textColor="#android:color/black"
android:textColorHint="#android:color/darker_gray"
android:singleLine="true"
android:minLines="1"
android:gravity="center_horizontal"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:focusableInTouchMode="true"
android:focusable="true" />
<EditText
android:id="#+id/login_password"
android:layout_width="match_parent"
android:layout_height="40dp"
android:hint="Password"
android:textColorHint="#android:color/darker_gray"
android:inputType="textPassword"
android:ems="10"
android:textColor="#android:color/black"
android:maxLines="1"
android:singleLine="true"
android:layout_marginTop="20dp"
android:gravity="center_horizontal"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:focusableInTouchMode="true"
android:focusable="true" />
<TextView
android:id="#+id/login_errorText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Login error"
android:textColor="#android:color/holo_red_dark"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:singleLine="false"
android:padding="5dp"
android:textSize="20sp"
android:layout_margin="10dp"
android:visibility="invisible" />
<Button
android:id="#+id/login_submitButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Login"
android:textSize="20sp"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp" />
</LinearLayout>
</ScrollView>
</LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="mypackage.sharedprefapp.MainActivity">
<TextView
android:id="#+id/person_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:textSize="25sp"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
splashscreen.xml (in drawable resources folder)
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#android:color/holo_green_dark"/>
<item>
<bitmap
android:gravity="center"
android:src="#mipmap/ic_launcher"/>
</item>
</layer-list>
mainmenu.xml (in res/menu resource folder)
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="#+id/logout_action"
android:title="Logout"
app:showAsAction="always" />
</menu>
styles.xml
<resources>
...
<style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
<item name="android:windowBackground">#drawable/splashscreen</item>
</style>
</resources>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="mypackage.sharedprefapp">
<!-- Needs internet to connect to Google Services -->
<uses-permission android:name="android.permission.INTERNET" />
<!-- Permission to check internet connection state -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:name=".App"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".SplashActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:theme="#style/AppTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:theme="#style/AppTheme" />
<activity
android:name=".LoginActivity"
android:label="#string/app_name"
android:process=":other_process"
android:screenOrientation="portrait"
android:theme="#style/AppTheme">
<intent-filter>
<action android:name="android.intent.action.LOGIN_ACTION" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
build.gradle (Module: app)
dependencies {
...
compile 'com.android.volley:volley:1.0.0'
}
Thank you!

Just call editor.clear();
and editor.commit();
is enough to delete all data from shared preference.

Because onResume, you keep on instantiating a new SharedPrefManager
sharedPrefManager = new SharedPrefManager(this);
Modify your SharedPrefManager so that it only gives one instance at all times OR make sure that you are referring to the same object when you return to LoginActivity.

SharedPreferences is permanent storage, you can clear
SharedPreferences.Editor.clear().commit();
alternate solution
you want once app close clear entire values,try Application singleton class

#Ciammarica you can call this code on click of Logout button, hope this can help you..you can set in logout button boolean value false..
SessionManager.setUserLoggedIn(YourActivity.this, false); SessionManager.clearAppCredential(YourActivity.this);

I Changed my code in order to have only one instance of SharedPrefManager class.
This is my App singleton class:
public class App extends Application
{
private static App mInstance;
private SharedPrefManager sharedPrefManager;
#Override
public void onCreate() {
super.onCreate();
mInstance = this;
sharedPrefManager = new SharedPrefManager(this);
}
public SharedPrefManager getSharedPrefManager(){
return sharedPrefManager;
}
public static synchronized App getInstance(){
return mInstance;
}
}
Then from other classes I get the instance by calling
SharedPrefManager sharedPrefManager = App.getInstance().getSharedPrefManager();
Now, with this change, the onSharedPreferenceChanged() event is triggered only once, so this is better than before, but the "delayed" behavior is still there... I mean, even if I use editor.clear(); and editor.commit(); methods, the values are updated but I can see them only if I close and open the app again.

I found the problem myself... It didn't like the sharedPrefManager.removeDataFromSharedPreference(); method to be called from inside new DialogInterface.OnClickListener()
I took it in another part of the code and it worked.

Rest Template PUT method In Android

I'm new to Android and Rest Template.I have developed a android
screen and display JSON data using Rest Template GET method on my
screen.My next step is to update some fields like edit name and add
missing things and save back to the rest Template.
public class MyPreferences extends AppCompatActivity {
TextView tv;
private Listcp = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_preferences);
Resources resources = getResources();
Log.d("Consumer pojo", "onCreate:");
new HttpRequestTask().execute();
}
private class HttpRequestTask extends AsyncTask<Void, Void, ConsumerProfile>{
#Override
protected ConsumerProfile doInBackground(Void... params) {
try {
final String url = "http://192.168.1.213:9001/consumer/local/"+LoginFragment.CONSUMEROBJECT.getId();
RestTemplate restTemplate = new RestTemplate();
ConsumerProfile cp = restTemplate.getForObject(url, ConsumerProfile.class);
return cp;
}catch (Exception e){
Log.e("MainActivity", e.getMessage(),e );
}
return null;
}
#Override
protected void onPostExecute(ConsumerProfile cp){
super.onPostExecute(cp);
Log.d("cppppppppppppppppppppp", "onPostExecute: " + cp.getId());
TextView fname=(TextView)findViewById(R.id.editfname);
TextView mname=(TextView)findViewById(R.id.editmname);
TextView lname=(TextView)findViewById(R.id.editlname);
TextView nname=(TextView)findViewById(R.id.editnname);
TextView dob=(TextView)findViewById(R.id.editdob);
TextView status=(TextView)findViewById(R.id.editstatus);
TextView homeAddress=(TextView)findViewById(R.id.edithomeAddr);
TextView workAddress=(TextView)findViewById(R.id.editworkAddr);
TextView income=(TextView)findViewById(R.id.editincome);
fname.setText(cp.getFirstName());
mname.setText(cp.getMiddleName());
lname.setText(cp.getLastName());
nname.setText(cp.getNickName());
dob.setText(cp.getDob());
status.setText(cp.getStatus());
homeAddress.setText(cp.getHomeAddress());
workAddress.setText(cp.getWorkAddress());
income.setText(cp.getIncome());
}
}This Screen is for Get Method
This is what I did Up to Now.
This code is for Get method.
It'll display The screen like in image.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"><![CDATA[
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
]]>
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/scrollView2" >
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"> <TextView
android:layout_width="wrap_content"
android:scrollbars="vertical"
android:layout_height="wrap_content"
android:text="firstName"/>
<EditText
android:id="#+id/editfname"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="middleName"/>
<EditText
android:id="#+id/editmname"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="lastName"/>
<EditText
android:id="#+id/editlname"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="nickName"/>
<EditText
android:id="#+id/editnname"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="dob"/>
<EditText
android:id="#+id/editdob"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="status"/>
<EditText
android:id="#+id/editstatus"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="homeAddress"/>
<EditText
android:id="#+id/edithomeAddr"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="workAddress"/>
<EditText
android:id="#+id/editworkAddr"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="income"/>
<EditText
android:id="#+id/editincome"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:scrollbars="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Update Preferences"
android:id="#+id/button"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</ScrollView>
</LinearLayout>
This is my layout.
Actually what I'm trying to do is Get User Information and Edit Information and save back to the same end point.
When the user select Update button Then it I'll Display the Updated Screen.
Any help Appreciated.
Anyone Provide code for that.
Thankful to them.

package com.nusecond.suredeal.app.suredeal.activity;
import android.content.Intent;
import android.content.res.Resources;
import android.net.http.HttpResponseCache;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.nusecond.suredeal.app.R;
import com.nusecond.suredeal.app.suredeal.pojo.Consumer;
import com.nusecond.suredeal.app.suredeal.pojo.ConsumerProfile;
import org.json.JSONException;
import org.json.JSONObject;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Resource;
public class MyPreferences extends AppCompatActivity {
Button button;
TextView tv;
TextView fname,mname,lname,nname,dob,status,homeAddress,workAddress,income;
private String FName,MName,LName,NName,Dob,Status,HomeAddress,WorkAddress,Income;
private List<ConsumerProfile>cp = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_preferences);
Resources resources = getResources();
Log.d("Consumer pojo", "onCreate:");
new HttpRequestTask().execute();
addListenerOnButton();
}
private void addListenerOnButton() {
//final String url = "http://192.168.1.213:9001/consumer/local/"+LoginFragment.CONSUMEROBJECT.getId();
Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FName=fname.getText().toString();
MName=mname.getText().toString();
LName=lname.getText().toString();
NName=nname.getText().toString();
Dob=dob.getText().toString();
Status=status.getText().toString();
HomeAddress=homeAddress.getText().toString();
WorkAddress=workAddress.getText().toString();
new HttpUpdateTask().execute();
// Toast.makeText(addListenerOnButton(),"UpdatedSuccessfully",Toast.LENGTH_LONG).show();
Intent intent=new Intent(MyPreferences.this,MainActivity.class);
startActivity(intent);
}
});
}
private class HttpRequestTask extends AsyncTask<Void, Void, ConsumerProfile>{
#Override
protected ConsumerProfile doInBackground(Void... params) {
try {
final String url = "http://192.168.1.213:9001/consumer/local/"+LoginFragment.CONSUMEROBJECT.getId();
RestTemplate restTemplate = new RestTemplate();
ConsumerProfile cp = restTemplate.getForObject(url, ConsumerProfile.class);
return cp;
}catch (Exception e){
Log.e("MainActivity", e.getMessage(),e );
}
return null;
}
#Override
protected void onPostExecute(ConsumerProfile cp){
super.onPostExecute(cp);
Log.d("cppppppppppppppppppppp", "onPostExecute: " + cp.getId());
fname=(TextView)findViewById(R.id.editfname);
mname=(TextView)findViewById(R.id.editmname);
lname=(TextView)findViewById(R.id.editlname);
nname=(TextView)findViewById(R.id.editnname);
dob=(TextView)findViewById(R.id.editdob);
status=(TextView)findViewById(R.id.editstatus);
homeAddress=(TextView)findViewById(R.id.edithomeAddr);
workAddress=(TextView)findViewById(R.id.editworkAddr);
income=(TextView)findViewById(R.id.editincome);
fname.setText(cp.getFirstName());
mname.setText(cp.getMiddleName());
lname.setText(cp.getLastName());
nname.setText(cp.getNickName());
dob.setText(cp.getDob());
status.setText(cp.getStatus());
homeAddress.setText(cp.getHomeAddress());
workAddress.setText(cp.getWorkAddress());
income.setText(cp.getIncome());
//FName=fname.getText().toString();
}
}
private class HttpUpdateTask extends AsyncTask<Void,Void,ConsumerProfile>{
#Override
protected ConsumerProfile doInBackground(Void... params) {
try {
final String url = "http://192.168.1.213:9001/consumer/local/" + LoginFragment.CONSUMEROBJECT.getId();
RestTemplate restTemplate = new RestTemplate();
ConsumerProfile consumerProfile = new ConsumerProfile();
// String m=FName;
consumerProfile.setFirstName(FName);
fname=(TextView)findViewById(R.id.editfname);
Log.d(" llllllllllllll", "doInBackground: " + FName);
consumerProfile.setMiddleName(MName);
consumerProfile.setLastName(LName);
consumerProfile.setNickName(NName);
consumerProfile.setDob(Dob);
consumerProfile.setStatus(Status);
consumerProfile.setHomeAddress(HomeAddress);
consumerProfile.setWorkAddress(WorkAddress);
consumerProfile.setDob(Income);
restTemplate.put(url,consumerProfile);
Log.d("ettttttttttttttt", "doInBackground: ");
return consumerProfile;
}catch (Exception e){
Log.e( "consumer", e.getMessage(),e);
}
return null;
}
}
}

Develop Reference

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