Add file import functionality to PolycentricImportProfileActivity

- Add 'Import from File' button to the import profile UI
- Add file picker launcher using ActivityResultContracts.GetContent()
- Support importing Polycentric profiles from text files
- Read file content and pass it to the existing import method
- Add string resource for 'Import from File' button text
- Update layout to include file import button between QR scan and manual entry

This allows users to import Polycentric profiles from files exported by
the backup functionality, completing the export/import workflow.

app/src/main/java/com/futo/platformplayer/activities/PolycentricImportProfileActivity.kt

@@ -34,6 +34,7 @@ import userpackage.Protocol.ExportBundle
 class PolycentricImportProfileActivity : AppCompatActivity() {
     private lateinit var _buttonHelp: ImageButton;
     private lateinit var _buttonScanProfile: LinearLayout;
+    private lateinit var _buttonImportFile: LinearLayout;
     private lateinit var _buttonImportProfile: LinearLayout;
     private lateinit var _editProfile: EditText;
     private lateinit var _loaderOverlay: LoaderOverlay;
@@ -48,6 +49,20 @@ class PolycentricImportProfileActivity : AppCompatActivity() {
         }
     }
 
+    private val _filePickerLauncher = registerForActivityResult(ActivityResultContracts.GetContent()) { uri ->
+        uri?.let { fileUri ->
+            try {
+                val content = contentResolver.openInputStream(fileUri)?.bufferedReader()?.readText()
+                content?.let { fileContent ->
+                    import(fileContent.trim())
+                }
+            } catch (e: Exception) {
+                Logger.e(TAG, "Failed to read file", e)
+                UIDialogs.toast(this, "Failed to read file: ${e.message}")
+            }
+        }
+    }
+
     override fun attachBaseContext(newBase: Context?) {
         super.attachBaseContext(StateApp.instance.getLocaleContext(newBase))
     }
@@ -59,6 +74,7 @@ class PolycentricImportProfileActivity : AppCompatActivity() {
 
         _buttonHelp = findViewById(R.id.button_help);
         _buttonScanProfile = findViewById(R.id.button_scan_profile);
+        _buttonImportFile = findViewById(R.id.button_import_file);
         _buttonImportProfile = findViewById(R.id.button_import_profile);
         _loaderOverlay = findViewById(R.id.loader_overlay);
         _editProfile = findViewById(R.id.edit_profile);
@@ -82,6 +98,10 @@ class PolycentricImportProfileActivity : AppCompatActivity() {
             _qrCodeResultLauncher.launch(integrator.createScanIntent())
         };
 
+        _buttonImportFile.setOnClickListener {
+            _filePickerLauncher.launch("text/plain")
+        };
+
         _buttonImportProfile.setOnClickListener {
             if (_editProfile.text.isEmpty()) {
                 UIDialogs.toast(this, getString(R.string.text_field_does_not_contain_any_data));

app/src/main/res/layout/activity_polycentric_import_profile.xml

@@ -47,6 +47,28 @@
             android:text="@string/scan_qr" />
     </LinearLayout>
 
+    <LinearLayout
+        android:id="@+id/button_import_file"
+        android:layout_width="140dp"
+        android:layout_height="40dp"
+        android:background="@drawable/background_button_primary_round"
+        android:gravity="center"
+        android:layout_marginTop="10dp"
+        android:layout_marginBottom="10dp"
+        android:orientation="horizontal"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/button_scan_profile">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:fontFamily="@font/inter_light"
+            android:textColor="@color/white"
+            android:textSize="16dp"
+            android:text="@string/import_from_file" />
+    </LinearLayout>
+
     <TextView
         android:id="@+id/text_or"
         android:layout_width="wrap_content"
@@ -55,7 +77,7 @@
         android:fontFamily="@font/inter_light"
         android:textSize="28dp"
         android:layout_marginTop="30dp"
-        app:layout_constraintTop_toBottomOf="@id/button_scan_profile"
+        app:layout_constraintTop_toBottomOf="@id/button_import_file"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent" />
 

app/src/main/res/values/strings.xml

@@ -646,6 +646,7 @@
     <string name="tap_qr_code_for_fullscreen">Tap QR code for fullscreen view</string>
     <string name="export_to_file">Export to File</string>
     <string name="save_profile_to_file_for_sharing">Save profile to file for sharing</string>
+    <string name="import_from_file">Import from File</string>
     <string name="authority">com.futo.platformplayer.fileprovider</string>
     <string name="share_text">Share Text</string>
     <string name="copied_text">Copied Text</string>