JAVA

install the app from assest of other app

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(
    new File(Environment.getExternalStorageDirectory() +  "/Download/yourApkFromAssets.apk")
), "application/vnd.android.package-archive");

install the app from assest of other app

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(
    new File(Environment.getExternalStorageDirectory() +  "/Download/yourApkFromAssets.apk")
), "application/vnd.android.package-archive");