title: Too many Activities being started when launching an Android Application
body: <p>I am confirming about creating activity. </p>
  
  <p>My Manifest.xml is like this :</p>
  
  <pre><code>&lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt;
  &lt;activity android:name=".FirstActivity"
            android:label="@string/app_name"&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=".SecondActivity"
            android:label="@string/app_name"&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=".ThirdActivity"
            android:label="@string/app_name"&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;
  </code></pre>
  
  <p></p>
  
  <p>You can see property <code>action android:name=</code> property is <code>"android.intent.action.MAIN"</code> and 
  <code>category android:name=</code> is <code>"android.intent.category.LAUNCHER"</code> for all activities.</p>
  
  <p>When the application starts up, it calls <strong>FirstActivity</strong>.
  Then calls useless Activity such as ThirdActivity or SecondActivity.</p>
  
  <p>In this case, is my <code>manifest.xml</code> correct?
  Or, do I need to set another property to Second and Third activity?
  If so, what is that?</p>
  
  <p>I wonder <code>manifest.xml</code> file is right for my case.
  Please advise.</p>