Share file between activites

1. Set this same shared user id in manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.a"
    android:versionCode="1"
    android:versionName="1.0"
    android:sharedUserId="com.example.id">
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.b"
    android:versionCode="1"
    android:versionName="1.0"
    android:sharedUserId="com. example.id">

2. Get another app’s context with createPackageContext()
Context otherContext = context.createPackageContext("com.example.a", 0);
AssetManager am = otherContext.getAssets();

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