Android programming software installation and uninstallation methods

String fileName = () + "/";
Intent intent = new Intent(Intent.ACTION_VIEW);
(("file://" + filePath),"application/-archive");

//((new File(fileName)), "application/-archive");
startActivity(intent);

Intent intent = new Intent();
(Intent.FLAG_ACTIVITY_NEW_TASK);
(.ACTION_VIEW);
/* Call getMIMEType() to get MimeType */
String type = getMIMEType(f);
/* Set the file and MimeType of the intent */
((f),type);
startActivity(intent);

<uses-permission android:name=""></uses-permission>
<uses-permission android:name=".INSTALL_PACKAGES"></uses-permission>
<uses-permission android:name=".MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
<uses-permission android:name=".WRITE_EXTERNAL_STORAGE"></uses-permission>

Uri packageURI = ("package:");
Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
startActivity(uninstallIntent);