title: Getting no output while using getPreference in Android
body: <p>I am trying to learn sharedPreferences in android and have written small piece of code for the same. But once i execute it, The application does not show any output.</p>
  
  <p>Here is my preference class:</p>
  
  <pre><code>public class SharedPreferncesExecutor {
      public static final String PREFS_NAME = "AOP_PREFS";
      public static final String PREFS_KEY = "AOP_PREFS_String";
  
      public SharedPreferncesExecutor() {
          super();
      }
  
      public void save(Context context, String Key, String Value) {
          SharedPreferences settings;
          SharedPreferences.Editor editor;
  
          //settings = PreferenceManager.getDefaultSharedPreferences(context);
          settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE); //1
          editor = settings.edit(); //2
  
          editor.putString(Key, Value); //3
  
          editor.commit(); //4
      }
  
      public String getValue(Context context,String key) {
          SharedPreferences settings;
          String text;
  
          //settings = PreferenceManager.getDefaultSharedPreferences(context);
          settings = context.getSharedPreferences(key, Context.MODE_PRIVATE);
          text = settings.getString(key, null);
          return text;
      }
  
      public void clearSharedPreference(Context context) {
          SharedPreferences settings;
          SharedPreferences.Editor editor;
  
          //settings = PreferenceManager.getDefaultSharedPreferences(context);
          settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
          editor = settings.edit();
  
          editor.clear();
          editor.commit();
      }
  
      public void removeValue(Context context) {
          SharedPreferences settings;
          SharedPreferences.Editor editor;
  
          settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
          editor = settings.edit();
  
          editor.remove(PREFS_KEY);
          editor.commit();
      }
  }
  </code></pre>
  
  <p>And here is my mainactivity that is making use of this class:</p>
  
  <pre><code>public class MainActivity extends Activity implements View.OnClickListener{
  
      ImageButton bLogOut,bHowItWorks;
  
      TextView SchoolDetail,AllClassDetail,TotalStudents,OneStudentDetail;
      //this is for having access to userlocalstore to save/remove local data to user phone during login or Log out. So that if logout is pressed
      //the data is wiped off the local storage on user mobile
      UserLocalStore userLocalStore;
  
      //Added to get the data from sharedPreferencesExecutor
      private SharedPreferncesExecutor sharedPreference;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          //getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
          //WindowManager.LayoutParams.FLAG_FULLSCREEN);
  
          setContentView(R.layout.activity_main);
  
          //etEmail= (EditText)findViewById(R.id.etEmail);
          //etPhoneNumber =(EditText)findViewById(R.id.etPhoneNumber);
          bLogOut = (ImageButton) findViewById(R.id.bLogOut);
  
          bLogOut.setOnClickListener(this);
  
          userLocalStore = new UserLocalStore(this);
          //added for QR codes scanner
          bHowItWorks = (ImageButton) findViewById(R.id.bHowItWorks);
          bHowItWorks.setOnClickListener(this);
          SchoolDetail = (TextView)findViewById(R.id.SchoolDetail);
  
  
          //Added to get the data from sharedPreferencesExecutor
          sharedPreference = new SharedPreferncesExecutor();
          Activity context = this;
          sharedPreference.save(context,"SchoolData","KV Station;;;class1-secA;;;class1-secB;;;class1-secC;;;class4;;;class2-secA;;;class2-secB;;;class2-secC;;;class3-secA;;;class3-secB;;;class3-secC;;;class4-secA;;;class4-secB;;;class4-secC;;;class5-secA;;;class5-secB;;;class5-secC");
          String SchoolData = sharedPreference.getValue(context,"SchoolData");
          SchoolDetail.setText(SchoolData);
  
      }
  
      @Override
      public void onClick(View v) {
          switch(v.getId()){
              case R.id.bLogOut:
                  userLocalStore.clearUserData();
                  userLocalStore.setUserLoggedIn(false);
  
                  startActivity(new Intent(this,Login.class));
  
                  break;
  
              case R.id.bHowItWorks:
                  startActivity(new Intent(this,howItWorks.class));
                  break;
          }
      }
  
      @Override
      protected void onStart() {
          super.onStart();
  
          if (authenticate() == true) {
              displayUserDetails();
          }
          else{
              Intent intentLogin = new Intent(MainActivity.this,Login.class);
              intentLogin.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
              startActivity(intentLogin);
          }
      }
  
      public boolean authenticate(){
          return userLocalStore.getUserLoggedIn();
      }
  
      public void displayUserDetails(){
          //User user = userLocalStore.getLoggedInUser();
          //etEmail.setText(user.Email);
          //etPhoneNumber.setText(user.PhoneNumber + "");
  
      }
  }
  </code></pre>
  
  <p>Here is my activityMain.xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;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:background="@drawable/bluebackgroundlowbits1"
      android:weightSum="8"
      android:id="@+id/abc"
      tools:context="com.example.amandeepsingh.LoginRegisterAndOther.MainActivity"&gt;
  
      &lt;ScrollView
          android:id="@+id/scrollView"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:fillViewport="true" &gt;
  
          &lt;LinearLayout
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"&gt;
  
  
              &lt;LinearLayout
                  android:orientation="vertical"
                  android:layout_width="fill_parent"
                  android:layout_height="0dp"
                  android:layout_weight="0.5"
                  &gt;
                  &lt;TextView
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:textColor="#FFFFFF"
                      android:textSize="20dp"
                      android:id="@+id/SchoolDetail"/&gt;
              &lt;/LinearLayout&gt;
              &lt;LinearLayout
                  android:orientation="vertical"
                  android:layout_width="fill_parent"
                  android:layout_height="0dp"
                  android:layout_weight="1"
                  &gt;
                  &lt;TextView
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:textColor="#FFFFFF"
                      android:textSize="20dp"
                      android:id="@+id/AllClassDetail"/&gt;
              &lt;/LinearLayout&gt;
  
              &lt;LinearLayout
                  android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="0dp"
                  android:layout_weight="1"
                  android:weightSum="3"
                  android:background="@drawable/bluebackgroundlowbits1"&gt;
                  &lt;TextView
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:textColor="#FFFFFF"
                      android:textSize="20dp"
                      android:id="@+id/TotalStudents"/&gt;
              &lt;/LinearLayout&gt;
  
              &lt;LinearLayout
                  android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="0dp"
                  android:layout_weight="1"
                  android:weightSum="3"
                  android:background="@drawable/bluebackgroundlowbits1"&gt;
                  &lt;TextView
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:textColor="#FFFFFF"
                      android:textSize="20dp"
                      android:id="@+id/OneStudentDetail"/&gt;
              &lt;/LinearLayout&gt;
  
  
              &lt;LinearLayout
                  android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="0dp"
                  android:layout_weight="1"
                  android:weightSum="1"
                  android:background="@drawable/bluebackgroundlowbits1"&gt;
                  &lt;ImageButton
                      android:id="@+id/bLogOut"
                      android:text="Logout"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_marginBottom="10dp"
                      android:textSize="20dp"/&gt;
                  &lt;ImageButton
                      android:id="@+id/bHowItWorks"
                      android:text="Logout"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_marginBottom="10dp"
                      android:textSize="20dp"/&gt;
              &lt;/LinearLayout&gt;
  
          &lt;/LinearLayout&gt;
      &lt;/ScrollView&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>After the execution, I am not getting any data. Please let me know if I am missing something</p>