title: Android new Intent with back button
body: <p>In my Android App I use an empty activity with one button. If I push the button I call a new activity with an intent. But on the new activity the back button (top left) to jump back to the last page is missing. Isn't there already a activity template from android studio or a spezial intent call to do this? Or what is the best way to do this?</p>
  
  <p>This is the function which is called on the button press</p>
  
  <pre><code>void scanClicked(View v){
      Intent intent = new Intent(this, ServiceActivity.class);
      startActivity(intent);
  }
  </code></pre>
  
  <p>The ServiceActivity is just an Empty Activity</p>
  
  <pre><code>    &lt;activity
          android:name=".LoginActivity"
          android:label="@string/title_activity_login"
          android:theme="@style/SplashTheme"
          android:windowSoftInputMode="adjustPan"&gt;
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
  
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
      &lt;/activity&gt;
      &lt;activity
          android:name=".NavigationActivity"
          android:label="@string/title_activity_navigation"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity android:name=".ServiceActivity"
          android:label="@string/annualServiceTitle"&gt;
      &lt;/activity&gt;
  </code></pre>