fix #978

app/src/main/java/ru/vtosters/lite/themes/palettes/PalettesManager.java

@@ -1,21 +1,25 @@
 package ru.vtosters.lite.themes.palettes;
 
+import android.os.Build;
 import android.os.Environment;
-
+import android.util.Log;
+import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-
 import org.json.JSONException;
 import org.json.JSONObject;
+import ru.vtosters.lite.themes.items.VTLPalette;
+import ru.vtosters.lite.utils.AndroidUtils;
+import ru.vtosters.lite.utils.IOUtils;
+import ru.vtosters.lite.utils.LifecycleUtils;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
-import ru.vtosters.lite.themes.items.VTLPalette;
-import ru.vtosters.lite.utils.AndroidUtils;
-import ru.vtosters.lite.utils.IOUtils;
+import static android.widget.Toast.makeText;
+import static ru.vtosters.lite.utils.AndroidUtils.getGlobalContext;
 
 public class PalettesManager {
 
@@ -40,6 +44,13 @@ public class PalettesManager {
         mPalettes.clear();
         if (!PALETTES_DIR.exists())
             PALETTES_DIR.mkdirs();
+
+        if (Build.VERSION.SDK_INT >= 23 && !Environment.getExternalStorageDirectory().canWrite()) {
+            makeText(getGlobalContext(), "Не выдано разрешение на запись и чтение файлов", Toast.LENGTH_LONG).show();
+            LifecycleUtils.getCurrentActivity().requestPermissions(new String[]{"android.permission.WRITE_EXTERNAL_STORAGE"}, 228);
+            return;
+        }
+
         final var palettes = PALETTES_DIR.listFiles((dir, name) -> name.endsWith(".json"));
         if (palettes == null || palettes.length == 0)
             copyPaletteFromAssets();
@@ -67,8 +78,12 @@ public class PalettesManager {
 
     private void parsePalettes() {
         var arr = PALETTES_DIR.listFiles((dir, name) -> name.endsWith(".json"));
-        if (arr == null || arr.length == 0)
-            throw new RuntimeException("Can't load palettes");
+
+        if (arr == null || arr.length == 0) {
+            Log.d("PalettesManager", "arr.length null");
+            return;
+        }
+
         for (var file : arr) {
             try {
                 var json = new JSONObject(IOUtils.readAllLines(file));

app/src/main/java/ru/vtosters/lite/ui/fragments/ThemesFragment.java

@@ -141,16 +141,18 @@ public class ThemesFragment extends MaterialPreferenceToolbarFragment {
     void showPalettesDialog() {
         final var manager = PalettesManager.getInstance();
         final var titles = new String[manager.getPalettesCount()];
-        for (int i = 0; i < titles.length; ++i)
-            titles[i] = manager.getPalette(i).name;
-        new VkAlertDialog.Builder(requireContext())
-                .setTitle(AndroidUtils.getString("select_palette"))
-                .setItems(titles, (dialog, which) ->
-                        PalettesBottomSheetDialog.create(requireActivity(), manager.getPalette(which),
-                                        (adapter, vtlcolor) -> setAccentColor(vtlcolor.color))
-                )
-                .setPositiveButton(R.string.cancel, null)
-                .show();
+        if (titles.length > 0) {
+            for (int i = 0; i < titles.length; ++i)
+                titles[i] = manager.getPalette(i).name;
+            new VkAlertDialog.Builder(requireContext())
+                    .setTitle(AndroidUtils.getString("select_palette"))
+                    .setItems(titles, (dialog, which) ->
+                            PalettesBottomSheetDialog.create(requireActivity(), manager.getPalette(which),
+                                    (adapter, vtlcolor) -> setAccentColor(vtlcolor.color))
+                    )
+                    .setPositiveButton(R.string.cancel, null)
+                    .show();
+        }
     }
 
     void setAccentColor(int color) {