title: what are the uses of main, default and launcher in manifest file in android
body: <pre><code>&lt;activity android:name="ApiDemos"&gt;
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
              &lt;category android:name="android.intent.category.DEFAULT" /&gt;
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
      &lt;/activity&gt;
  </code></pre>
  
  <p>-Can any one explain about main, default and launcher what are the use of those properties in manifest for activity if used more than 1 activity in my project?</p>