title: Usage of android:process
body: <p>I have this AndroidManifest.xml file:</p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
  android:versionCode="1" android:versionName="1.0.0.0721"
  android:process="com.lily.process" package="com.lily.test"&gt;
  
      &lt;provider android:authorities="com.lily.test"
        android:name="com.lily.test.provider" 
        android:process="com.lily.process"&gt;
      &lt;/provider&gt;
  </code></pre>
  
  <p>"android:process" is added both as manifest tag and provider tag, I know if it is added as a provider tag, the provider can be run in the "com.lily.process" process. But what's the usage of it when written as a manifest tag? 
  I have tried, but not all components could be running in the process it identified.</p>