title: Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference
body: <blockquote>
    <p>i am about to making the android  application but due to FATAL
    EXCEPTION: main java.lang.NULLPOINTEREXCEPTION the application aren't saving
    the data please help me here </p>
  </blockquote>
  
  <p>here is my EditNoteActivity</p>
  
  <pre><code>    package com.example.notepad.myapplication;
  import android.os.Bundle;
  import android.support.v7.app.ActionBarActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.View;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.Toast;
  
  import java.util.List;
  
  
     public class EditNoteActivity extends ActionBarActivity implements View.OnClickListener {
      String A, B;
      int id;
      Boolean isUpdate = false;
      Button Save, Delete;
      private Toolbar toolbar;
      EditText edit;
      EditText edit1;
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_edit_notes);
          toolbar = (Toolbar) findViewById(R.id.app_bar);
          setSupportActionBar(toolbar);
          getSupportActionBar().setHomeButtonEnabled(true);
          getSupportActionBar().setDisplayHomeAsUpEnabled(true);
          EditText edit = (EditText) this.findViewById(R.id.editText2);
          EditText edit1 = (EditText) this.findViewById(R.id.editText);
          A = edit.getText().toString();
          B = edit1.getText().toString();
  
          Note note = new Note();
          note.setDescription(A);
          note.setTitle(B);
          Save = (Button) findViewById(R.id.button);
          Save.setOnClickListener(this);
          Delete = (Button) findViewById(R.id.button2);
          Delete.setOnClickListener(this);
  
          Bundle bundle = getIntent().getExtras();
          if (bundle != null &amp;&amp; bundle.containsKey("source")) {
              if (bundle.getString("source").equalsIgnoreCase("editpress")) {
                  isUpdate = true;
                  id = bundle.getInt("noteId");
                  A = bundle.getString("noteTitle");
                  B = bundle.getString("noteDescription");
              } else if (bundle.getString("source").equalsIgnoreCase("addPress")) {
                  isUpdate = false;
  
              } else {
                  Toast.makeText(this, "invalid argument", Toast.LENGTH_SHORT).show();
                  super.onBackPressed();
              }
          }
      }
  
      public void Save() {
          A = edit.getText().toString();
          B = edit1.getText().toString();
  
          if (!isvalid()) {
              return;
          }
          Note note = new Note();
          note.setTitle(A);
          note.setDescription(B);
          Databasehandler data = new Databasehandler(this);
          if (!isUpdate) {
              data.addnote(note);
              Toast.makeText(this, "notes added sucessfully", Toast.LENGTH_LONG).show();
          } else {
  
          }
          List&lt;Note&gt; list = data.getAllNotes();
          MainActivity.adapt.clear();
          MainActivity.adapt.addAll(list);
          MainActivity.adapt.notifyDataSetChanged();
          super.onBackPressed();
  
      }
  
      public void Delete() {
  
      }
  
      public boolean isvalid() {
          if (A.isEmpty() &amp;&amp; A != null &amp;&amp; B.isEmpty() &amp;&amp; B != null) {
              Toast.makeText(this, "please enter tittle and description", Toast.LENGTH_SHORT).show();
              return false;
          } else if (A.isEmpty() &amp;&amp; A != null) {
              Toast.makeText(this, "please enter title", Toast.LENGTH_SHORT).show();
              return false;
          } else if (B.isEmpty() &amp;&amp; B != null) {
              Toast.makeText(this, "please enter description", Toast.LENGTH_SHORT).show();
              return false;
          }
          return true;
      }
  
      @Override
      public void onClick(View view) {
          switch (view.getId()) {
              case R.id.button:
                  Save();
                  break;
  
          }
  
      }
  }
  </code></pre>
  
  <blockquote>
    <p>Here is my Logcat error</p>
  </blockquote>
  
  <pre><code>E/AndroidRuntime: FATAL EXCEPTION: main
                                                 Process: com.example.notepad.myapplication, PID: 30744
                                                 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.notepad.myapplication/com.example.notepad.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference
                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
                                                     at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                     at android.os.Looper.loop(Looper.java:154)
                                                     at android.app.ActivityThread.main(ActivityThread.java:6077)
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
                                                  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference
                                                     at com.example.notepad.myapplication.BlankFragment.setup(BlankFragment.java:64)
                                                     at com.example.notepad.myapplication.MainActivity.onCreate(MainActivity.java:36)
                                                     at android.app.Activity.performCreate(Activity.java:6662)
                                                     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
                                                     at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                     at android.os.Looper.loop(Looper.java:154) 
                                                     at android.app.ActivityThread.main(ActivityThread.java:6077) 
                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756) 
  </code></pre>
  
  <blockquote>
    <p>please Help me here as i have tried every possible combination .i will
    be very much thankful to you all and thankz in andvance.</p>
  </blockquote>