Fix(backup): Add exception handling for restore operations

This commit adds `try-catch` blocks to handle potential `FileNotFoundException` and `SecurityException` when restoring backups and themes.

If a file cannot be opened or permission is denied during the restore process from a URI, the exception is now caught, its stack trace is printed, and a toast message is displayed to the user ("Selected file could not be opened" or "Permission denied"). This prevents the application from crashing and provides user feedback in case of an error.

Author: CreativeCodeCat

app/src/main/java/com/github/droidworksstudio/mlauncher/MainActivity.kt

@@ -38,6 +38,7 @@ import com.squareup.moshi.Types
 import org.xmlpull.v1.XmlPullParser
 import java.io.BufferedReader
 import java.io.File
+import java.io.FileNotFoundException
 import java.io.FileOutputStream
 import java.io.InputStream
 import java.io.InputStreamReader
@@ -201,21 +202,29 @@ class MainActivity : AppCompatActivity() {
         performFullRestore = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
             if (result.resultCode == RESULT_OK) {
                 result.data?.data?.let { uri ->
-                    applicationContext.contentResolver.openInputStream(uri).use { inputStream ->
-                        val stringBuilder = StringBuilder()
-                        BufferedReader(InputStreamReader(inputStream)).use { reader ->
-                            var line: String? = reader.readLine()
-                            while (line != null) {
-                                stringBuilder.append(line)
-                                line = reader.readLine()
+                    try {
+                        applicationContext.contentResolver.openInputStream(uri).use { inputStream ->
+                            val stringBuilder = StringBuilder()
+                            BufferedReader(InputStreamReader(inputStream)).use { reader ->
+                                var line: String? = reader.readLine()
+                                while (line != null) {
+                                    stringBuilder.append(line)
+                                    line = reader.readLine()
+                                }
                             }
-                        }
 
-                        val string = stringBuilder.toString()
-                        val prefs = Prefs(applicationContext)
-                        prefs.clear()
-                        prefs.loadFromString(string)
-                        AppReloader.restartApp(applicationContext)
+                            val string = stringBuilder.toString()
+                            val prefs = Prefs(applicationContext)
+                            prefs.clear()
+                            prefs.loadFromString(string)
+                            AppReloader.restartApp(applicationContext)
+                        }
+                    } catch (e: FileNotFoundException) {
+                        e.printStackTrace()
+                        showLongToast("Selected file could not be opened")
+                    } catch (e: SecurityException) {
+                        e.printStackTrace()
+                        showLongToast("Permission denied")
                     }
                 }
             }
@@ -272,19 +281,27 @@ class MainActivity : AppCompatActivity() {
                 }
 
                 result.data?.data?.let { uri ->
-                    applicationContext.contentResolver.openInputStream(uri).use { inputStream ->
-                        val stringBuilder = StringBuilder()
-                        BufferedReader(InputStreamReader(inputStream)).use { reader ->
-                            var line: String? = reader.readLine()
-                            while (line != null) {
-                                stringBuilder.append(line)
-                                line = reader.readLine()
+                    try {
+                        applicationContext.contentResolver.openInputStream(uri).use { inputStream ->
+                            val stringBuilder = StringBuilder()
+                            BufferedReader(InputStreamReader(inputStream)).use { reader ->
+                                var line: String? = reader.readLine()
+                                while (line != null) {
+                                    stringBuilder.append(line)
+                                    line = reader.readLine()
+                                }
                             }
-                        }
 
-                        val string = stringBuilder.toString()
-                        val prefs = Prefs(applicationContext)
-                        prefs.loadFromTheme(string)
+                            val string = stringBuilder.toString()
+                            val prefs = Prefs(applicationContext)
+                            prefs.loadFromTheme(string)
+                        }
+                    } catch (e: FileNotFoundException) {
+                        e.printStackTrace()
+                        showLongToast("Selected file could not be opened")
+                    } catch (e: SecurityException) {
+                        e.printStackTrace()
+                        showLongToast("Permission denied")
                     }
                 }
             }