Two app with shared UserID

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You can use android:sharedUserId in AndroidManifest.xml to let your application share the same user id with another application.

android:sharedUserId

The name of a Linux user ID that will be shared with other
applications. By default, Android assigns each application its own
unique user ID. However, if this attribute is set to the same value
for two or more applications, they will all share the same ID —
provided that they are also signed by the same certificate.
Application with the same user ID can access each other’s data and, if
desired, run in the same process.

Notice that they need to be signed by the same certificate.

Two applications share the same user id may access each other’s resource.

For example:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.shareusertesta"
    android:versionCode="1"
    android:versionName="1.0" 
    android:sharedUserId="com.example">

Then we can init a new context of com.example by:

Context friendContext = this.createPackageContext( "com.example",Context.CONTEXT_IGNORE_SECURITY);

And access some resources of that application:

friendContext.getResources().getString(id);
friendContext.getResources().getDrawable(id);
friendContext.registerReceiver(...);

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