Resolve some crashes reported on Play Store (#631)

* ShowSshKeyFragment: Resolve illegal casts

* UserPreference: Try harder to not crash

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

Author: msfjarvis

app/src/main/java/com/zeapo/pwdstore/UserPreference.kt

@@ -481,7 +481,7 @@ class UserPreference : AppCompatActivity() {
                     // TODO: This is fragile. Workaround until PasswordItem is backed by DocumentFile
                     val docId = DocumentsContract.getTreeDocumentId(uri)
                     val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
-                    val repoPath = "${Environment.getExternalStorageDirectory()}/${split[1]}"
+                    val repoPath = "${Environment.getExternalStorageDirectory()}/${split[1] ?: split[0]}"
 
                     Timber.tag(TAG).d("Selected repository path is $repoPath")
 

app/src/main/java/com/zeapo/pwdstore/sshkeygen/ShowSshKeyFragment.kt

@@ -22,18 +22,17 @@ import org.apache.commons.io.FileUtils
 
 class ShowSshKeyFragment : DialogFragment() {
 
-    private lateinit var activity: SshKeyGenActivity
     private lateinit var builder: MaterialAlertDialogBuilder
     private lateinit var publicKey: TextView
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        activity = requireActivity() as SshKeyGenActivity
-        builder = MaterialAlertDialogBuilder(activity)
+        builder = MaterialAlertDialogBuilder(requireActivity())
     }
 
     @SuppressLint("InflateParams")
     override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val activity = requireActivity()
         val view = activity.layoutInflater.inflate(R.layout.fragment_show_ssh_key, null)
         publicKey = view.findViewById(R.id.public_key)
         readKeyFromFile()
@@ -53,13 +52,13 @@ class ShowSshKeyFragment : DialogFragment() {
     private fun createMaterialDialog(view: View) {
         builder.setView(view)
         builder.setTitle(getString(R.string.your_public_key))
-        builder.setPositiveButton(getString(R.string.dialog_ok)) { _, _ -> activity.finish() }
+        builder.setPositiveButton(getString(R.string.dialog_ok)) { _, _ -> requireActivity().finish() }
         builder.setNegativeButton(getString(R.string.dialog_cancel), null)
         builder.setNeutralButton(resources.getString(R.string.ssh_keygen_copy), null)
     }
 
     private fun readKeyFromFile() {
-        val file = File(activity.filesDir.toString() + "/.ssh_key.pub")
+        val file = File(requireActivity().filesDir.toString() + "/.ssh_key.pub")
         try {
             publicKey.text = FileUtils.readFileToString(file, StandardCharsets.UTF_8)
         } catch (e: Exception) {