How can I share a SharedPreferences file across two different android apps?

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It is better to set private mode for the file. App needs to be signed with same set of certificates to share this file.

Set sharedUserId in both apps to be same.

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

Get Context from other package:

mContext = context.createPackageContext(
                        "com.example.otherapp",
                        Context.MODE_PRIVATE);
 mPrefs = mContext.getSharedPreferences("sameFileNameHere", Activity.MODE_PRIVATE);

Get items as usual from SharedPreference. You can access it now.

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