title: error on creating new intent
body: <p>what's wrong with MainActivity.this here: </p>
  
  <pre><code>Intent myIntent = new Intent(MainActivity.this, SecondActivity.class);
  </code></pre>
  
  <p>when I press Ctrl+Space it suggest  MainActivity.this but then rais an error :</p>
  
  <p>this is Java :</p>
  
  <pre><code>    package com.example.explicitintent;
  
  import android.app.ActionBar;
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.support.v7.app.ActionBarActivity;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.view.ViewGroup;
  import android.widget.Button;
  
  public class MainActivity extends ActionBarActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          if (savedInstanceState == null) {
              getSupportFragmentManager().beginTransaction()
                      .add(R.id.container, new PlaceholderFragment()).commit();
          }
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
  
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
          if (id == R.id.action_settings) {
              return true;
          }
          return super.onOptionsItemSelected(item);
      }
  
      /**
       * A placeholder fragment containing a simple view.
       */
      public static class PlaceholderFragment extends Fragment {
  
          public PlaceholderFragment() {
          }
  
          @Override
          public View onCreateView(LayoutInflater inflater, ViewGroup container,
                  Bundle savedInstanceState) {
              View rootView = inflater.inflate(R.layout.fragment_main, container,
                      false);
              Button btn = (Button)rootView.findViewById(R.id.button1);
              btn.setOnClickListener(new OnClickListener() {
  
                  @Override
                  public void onClick(View arg0) {
                      Intent myIntent = new Intent(MainActivity.this, SecondActivity.class);
                      startActivity(myIntent);
  
  
                  }
              });
              return rootView;
          }
      }
  
  }
  </code></pre>
  
  <p>and this is error:</p>
  
  <p><img src="https://i.stack.imgur.com/DFeBt.png" alt="enter image description here"></p>