AndroidStudio tells me the sdk version setting in AndroidManifest is a

bad idea, because it is redundant to the setting in app/build.gradle

app/src/main/AndroidManifest.xml

@@ -3,7 +3,6 @@
       package="org.galexander.sshd"
       android:versionCode="19"
       android:versionName="19">
-    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="16" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />