title: How to invoke an Activity (belonging to a module) in another module in Android?
body: <p>Here's the scenario : 
  I have 2 modules (In Android Studio, File -> New -> New Module) in my single application. </p>
  
  <ol>
  <li>Module A</li>
  <li>Module B</li>
  </ol>
  
  <p>Module A (Its not a library project. 
  it's gradle starts with apply plugin: 'com.android.application'). </p>
  
  <p>Module B (which is also not a library module). </p>
  
  <p>Inside module B, I need to invoke an Activity (say MainActivity) which belongs to module A. </p>
  
  <p><strong>Module A manifest :</strong></p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.abc.emergencycontacts"&gt;
      &lt;uses-permission android:name="android.permission.READ_CONTACTS"&gt;&lt;/uses-permission&gt;
      &lt;uses-permission android:name="android.permission.WRITE_CONTACTS"&gt;&lt;/uses-permission&gt;
      &lt;application
          android:allowBackup="true"
          android:icon="@mipmap/ic_launcher"
          android:label="@string/app_name"
          android:supportsRtl="true"&gt;
  &lt;activity android:name=".EmergencyContactsActivity" android:theme="@style/AppTheme"&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;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>Module B manifest :</p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.abc.secondaryactivity"&gt;
  
      &lt;application
          android:allowBackup="true"
          android:label="@string/app_name"
          android:supportsRtl="true"&gt;
  
          &lt;activity android:name=".BaseAppActivity"&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;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>How do I achieve it?</p>
  
  <p>Please note that I cannot add module A's dependency in module B, since module A is not a library module.</p>
  
  <p>Awaiting your valuable response.</p>