Add loading dialog

os/android/app/src/main/java/com/alexbatalov/fallout2ce/FileUtils.java

@@ -0,0 +1,56 @@
+package com.alexbatalov.fallout2ce;
+
+import android.content.ContentResolver;
+
+import androidx.documentfile.provider.DocumentFile;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class FileUtils {
+
+    static boolean copyRecursively(ContentResolver contentResolver, DocumentFile src, File dest) {
+        final DocumentFile[] documentFiles = src.listFiles();
+        for (final DocumentFile documentFile : documentFiles) {
+            if (documentFile.isFile()) {
+                if (!copyFile(contentResolver, documentFile, new File(dest, documentFile.getName()))) {
+                    return false;
+                }
+            } else if (documentFile.isDirectory()) {
+                final File subdirectory = new File(dest, documentFile.getName());
+                if (!subdirectory.exists()) {
+                    subdirectory.mkdir();
+                }
+
+                if (!copyRecursively(contentResolver, documentFile, subdirectory)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    private static boolean copyFile(ContentResolver contentResolver, DocumentFile src, File dest) {
+        try {
+            final InputStream inputStream = contentResolver.openInputStream(src.getUri());
+            final OutputStream outputStream = new FileOutputStream(dest);
+
+            final byte[] buffer = new byte[16384];
+            int bytesRead;
+            while ((bytesRead = inputStream.read(buffer)) != -1) {
+                outputStream.write(buffer, 0, bytesRead);
+            }
+
+            inputStream.close();
+            outputStream.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+            return false;
+        }
+
+        return true;
+    }
+}

os/android/app/src/main/java/com/alexbatalov/fallout2ce/ImportActivity.java

@@ -1,6 +1,8 @@
 package com.alexbatalov.fallout2ce;
 
 import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.ContentResolver;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
@@ -8,10 +10,6 @@ import android.os.Bundle;
 import androidx.documentfile.provider.DocumentFile;
 
 import java.io.File;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
 
 public class ImportActivity extends Activity {
     private static final int IMPORT_REQUEST_CODE = 1;
@@ -25,65 +23,47 @@ public class ImportActivity extends Activity {
 
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent resultData) {
-        if (requestCode == IMPORT_REQUEST_CODE) {
+        if (requestCode != IMPORT_REQUEST_CODE || resultCode != Activity.RESULT_OK) {
-            if (resultCode == Activity.RESULT_OK) {
+            finish();
+        }
+
         final Uri treeUri = resultData.getData();
         if (treeUri != null) {
             final DocumentFile treeDocument = DocumentFile.fromTreeUri(this, treeUri);
             if (treeDocument != null) {
-                        copyRecursively(treeDocument, getExternalFilesDir(null));
+                copyFiles(treeDocument);
+            }
+        }
+    }
 
-                        final Intent intent = new Intent(this, MainActivity.class);
+    private void copyFiles(DocumentFile treeDocument) {
+        ProgressDialog dialog = createProgressDialog();
+        dialog.show();
+
+        new Thread(() -> {
+            ContentResolver contentResolver = getContentResolver();
+            File externalFilesDir = getExternalFilesDir(null);
+            FileUtils.copyRecursively(contentResolver, treeDocument, externalFilesDir);
+
+            startMainActivity();
+            dialog.dismiss();
+            finish();
+        }).start();
+    }
+
+    private void startMainActivity() {
+        Intent intent = new Intent(this, MainActivity.class);
         startActivity(intent);
     }
-                }
-            }
 
-            finish();
+    private ProgressDialog createProgressDialog() {
-        } else {
+        ProgressDialog progressDialog = new ProgressDialog(this,
-            super.onActivityResult(requestCode, resultCode, resultData);
+            android.R.style.Theme_Material_Light_Dialog);
-        }
+        progressDialog.setTitle(R.string.loading_dialog_title);
-    }
+        progressDialog.setMessage(getString(R.string.loading_dialog_message));
+        progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
+        progressDialog.setCancelable(false);
 
-    private boolean copyRecursively(DocumentFile src, File dest) {
+        return progressDialog;
-        final DocumentFile[] documentFiles = src.listFiles();
-        for (final DocumentFile documentFile : documentFiles) {
-            if (documentFile.isFile()) {
-                if (!copyFile(documentFile, new File(dest, documentFile.getName()))) {
-                    return false;
-                }
-            } else if (documentFile.isDirectory()) {
-                final File subdirectory = new File(dest, documentFile.getName());
-                if (!subdirectory.exists()) {
-                    subdirectory.mkdir();
-                }
-
-                if (!copyRecursively(documentFile, subdirectory)) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-
-    private boolean copyFile(DocumentFile src, File dest) {
-        try {
-            final InputStream inputStream = getContentResolver().openInputStream(src.getUri());
-            final OutputStream outputStream = new FileOutputStream(dest);
-
-            final byte[] buffer = new byte[16384];
-            int bytesRead;
-            while ((bytesRead = inputStream.read(buffer)) != -1) {
-                outputStream.write(buffer, 0, bytesRead);
-            }
-
-            inputStream.close();
-            outputStream.close();
-        } catch (IOException e) {
-            e.printStackTrace();
-            return false;
-        }
-
-        return true;
     }
 }

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

@@ -1,3 +1,5 @@
 <resources>
     <string name="app_name">Fallout 2</string>
+    <string name="loading_dialog_title">PLEASE STAND BY</string>
+    <string name="loading_dialog_message">Copying files…</string>
 </resources>