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How to use shared preferences

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-1

I want to save user entered login values to save in sharedpreferences and retrieve it in another page. But the problem is when I go to data retrieving page app is crashing. Please help me.

LoginActivity.java

 SharedPreferences loginData = getSharedPreferences("userInfo", 
 Context.MODE_PRIVATE);
 SharedPreferences.Editor editor = loginData.edit();
 editor.putString("password", passwordbox.getText().toString());
 editor.putString("userName", usernamebox.getText().toString());

 editor.apply();

Data Retrieving page

public class messagewebview extends AppCompatActivity 
 TextView testing_name;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
 String name = loginData.getString("userName", "");
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

java android sharedpreferences

share|improve this question

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Loads of examples on SO already. Heres an answer that should help. stackoverflow.com/a/12074219/940834 . Do you have a stack trace as to the crash, so we can see why its crashing? your code looks correct, except that testing_name is probably null.. You need to load it from the layout
  
  – Doomsknight
  Mar 22 at 21:06
  
  

  
  
  
  

add a comment | 

-1

I want to save user entered login values to save in sharedpreferences and retrieve it in another page. But the problem is when I go to data retrieving page app is crashing. Please help me.

LoginActivity.java

 SharedPreferences loginData = getSharedPreferences("userInfo", 
 Context.MODE_PRIVATE);
 SharedPreferences.Editor editor = loginData.edit();
 editor.putString("password", passwordbox.getText().toString());
 editor.putString("userName", usernamebox.getText().toString());

 editor.apply();

Data Retrieving page

public class messagewebview extends AppCompatActivity 
 TextView testing_name;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
 String name = loginData.getString("userName", "");
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

java android sharedpreferences

share|improve this question

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Loads of examples on SO already. Heres an answer that should help. stackoverflow.com/a/12074219/940834 . Do you have a stack trace as to the crash, so we can see why its crashing? your code looks correct, except that testing_name is probably null.. You need to load it from the layout
  
  – Doomsknight
  Mar 22 at 21:06
  
  

  
  
  
  

add a comment | 

I want to save user entered login values to save in sharedpreferences and retrieve it in another page. But the problem is when I go to data retrieving page app is crashing. Please help me.

LoginActivity.java

 SharedPreferences loginData = getSharedPreferences("userInfo", 
 Context.MODE_PRIVATE);
 SharedPreferences.Editor editor = loginData.edit();
 editor.putString("password", passwordbox.getText().toString());
 editor.putString("userName", usernamebox.getText().toString());

 editor.apply();

Data Retrieving page

public class messagewebview extends AppCompatActivity 
 TextView testing_name;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
 String name = loginData.getString("userName", "");
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

java android sharedpreferences

share|improve this question

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

 SharedPreferences loginData = getSharedPreferences("userInfo", 
 Context.MODE_PRIVATE);
 SharedPreferences.Editor editor = loginData.edit();
 editor.putString("password", passwordbox.getText().toString());
 editor.putString("userName", usernamebox.getText().toString());

 editor.apply();

public class messagewebview extends AppCompatActivity 
 TextView testing_name;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
 String name = loginData.getString("userName", "");
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

java android sharedpreferences

java android sharedpreferences

share|improve this question

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

share|improve this question

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

edited Mar 23 at 7:56

Anurag Srivastava

2,27821220

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

asked Mar 22 at 21:04

Kavinda NuwanKavinda Nuwan

12

2 Answers
2

active

oldest

votes

0

Your variable "testing_name" is not initialized. A variable must be initialized before you start using it.

Do following changes in your code.

 public class messagewebview extends AppCompatActivity 

 TextView testing_name; 

 @Override protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 // Provide a appropriate view id
 testing_name = findViewById(R.id.testing_name);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE); 
 String name = loginData.getString("userName", ""); 
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

 

share|improve this answer

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

add a comment | 

0

testing_name is not initialized.

share|improve this answer

edited Mar 22 at 21:28

morten.c

2,72433239

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387

add a comment | 

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0

Your variable "testing_name" is not initialized. A variable must be initialized before you start using it.

Do following changes in your code.

 public class messagewebview extends AppCompatActivity 

 TextView testing_name; 

 @Override protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 // Provide a appropriate view id
 testing_name = findViewById(R.id.testing_name);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE); 
 String name = loginData.getString("userName", ""); 
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

 

share|improve this answer

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

add a comment | 

0

Your variable "testing_name" is not initialized. A variable must be initialized before you start using it.

Do following changes in your code.

 public class messagewebview extends AppCompatActivity 

 TextView testing_name; 

 @Override protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 // Provide a appropriate view id
 testing_name = findViewById(R.id.testing_name);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE); 
 String name = loginData.getString("userName", ""); 
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

 

share|improve this answer

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

add a comment | 

Your variable "testing_name" is not initialized. A variable must be initialized before you start using it.

Do following changes in your code.

 public class messagewebview extends AppCompatActivity 

 TextView testing_name; 

 @Override protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 // Provide a appropriate view id
 testing_name = findViewById(R.id.testing_name);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE); 
 String name = loginData.getString("userName", ""); 
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

 

share|improve this answer

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

 public class messagewebview extends AppCompatActivity 

 TextView testing_name; 

 @Override protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_messagewebview);
 // Provide a appropriate view id
 testing_name = findViewById(R.id.testing_name);
 SharedPreferences loginData = getSharedPreferences("userInfo", Context.MODE_PRIVATE); 
 String name = loginData.getString("userName", ""); 
 String pw = loginData.getString("password","");
 String msg = "Saved User Name: " + name + "nSaved Password: " + pw;
 testing_name.setText(msg);

 

 

share|improve this answer

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

answered Mar 22 at 21:23

Amrat SinghAmrat Singh

238211

0

testing_name is not initialized.

share|improve this answer

edited Mar 22 at 21:28

morten.c

2,72433239

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387

add a comment | 

0

testing_name is not initialized.

share|improve this answer

edited Mar 22 at 21:28

morten.c

2,72433239

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387

add a comment | 

testing_name is not initialized.

share|improve this answer

edited Mar 22 at 21:28

morten.c

2,72433239

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387

share|improve this answer

edited Mar 22 at 21:28

morten.c

2,72433239

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387

edited Mar 22 at 21:28

morten.c

2,72433239

edited Mar 22 at 21:28

morten.c

2,72433239

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387

answered Mar 22 at 21:09

Sandeep PolamuriSandeep Polamuri

4387