Android: Warn when path in config is unavailable

Content URIs stop working if Dolphin loses permissions,
which happens for instance when reinstalling Dolphin.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java

@@ -36,6 +36,7 @@ import org.dolphinemu.dolphinemu.R;
 import org.dolphinemu.dolphinemu.features.settings.model.BooleanSetting;
 import org.dolphinemu.dolphinemu.features.settings.model.IntSetting;
 import org.dolphinemu.dolphinemu.features.settings.model.Settings;
+import org.dolphinemu.dolphinemu.features.settings.model.StringSetting;
 import org.dolphinemu.dolphinemu.features.settings.ui.MenuTag;
 import org.dolphinemu.dolphinemu.features.settings.ui.SettingsActivity;
 import org.dolphinemu.dolphinemu.features.settings.utils.SettingsFile;
@@ -170,13 +171,38 @@ public final class EmulationActivity extends AppCompatActivity
     if (sIgnoreLaunchRequests)
       return;
 
+    new AfterDirectoryInitializationRunner().run(activity, true, () ->
+    {
+      if (FileBrowserHelper.isPathEmptyOrValid(StringSetting.MAIN_DEFAULT_ISO) &&
+              FileBrowserHelper.isPathEmptyOrValid(StringSetting.MAIN_FS_PATH) &&
+              FileBrowserHelper.isPathEmptyOrValid(StringSetting.MAIN_DUMP_PATH) &&
+              FileBrowserHelper.isPathEmptyOrValid(StringSetting.MAIN_LOAD_PATH) &&
+              FileBrowserHelper.isPathEmptyOrValid(StringSetting.MAIN_RESOURCEPACK_PATH) &&
+              FileBrowserHelper.isPathEmptyOrValid(StringSetting.MAIN_SD_PATH))
+      {
+        launchWithoutChecks(activity, filePaths);
+      }
+      else
+      {
+        AlertDialog.Builder builder = new AlertDialog.Builder(activity, R.style.DolphinDialogBase);
+        builder.setMessage(R.string.unavailable_paths);
+        builder.setPositiveButton(R.string.yes, (dialogInterface, i) ->
+                SettingsActivity.launch(activity, MenuTag.CONFIG_PATHS));
+        builder.setNeutralButton(R.string.continue_anyway, (dialogInterface, i) ->
+                launchWithoutChecks(activity, filePaths));
+        builder.show();
+      }
+    });
+  }
+
+  private static void launchWithoutChecks(FragmentActivity activity, String[] filePaths)
+  {
     sIgnoreLaunchRequests = true;
 
     Intent launcher = new Intent(activity, EmulationActivity.class);
     launcher.putExtra(EXTRA_SELECTED_GAMES, filePaths);
 
-    new AfterDirectoryInitializationRunner().run(activity, true,
-            () -> activity.startActivity(launcher));
+    activity.startActivity(launcher);
   }
 
   public static void stopIgnoringLaunchRequests()

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/viewholder/FilePickerViewHolder.java

@@ -1,5 +1,6 @@
 package org.dolphinemu.dolphinemu.features.settings.ui.viewholder;
 
+import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.TextView;
@@ -10,6 +11,7 @@ import org.dolphinemu.dolphinemu.features.settings.model.view.SettingsItem;
 import org.dolphinemu.dolphinemu.features.settings.ui.SettingsAdapter;
 import org.dolphinemu.dolphinemu.ui.main.MainPresenter;
 import org.dolphinemu.dolphinemu.utils.DirectoryInitialization;
+import org.dolphinemu.dolphinemu.utils.FileBrowserHelper;
 
 public final class FilePickerViewHolder extends SettingViewHolder
 {
@@ -19,6 +21,8 @@ public final class FilePickerViewHolder extends SettingViewHolder
   private TextView mTextSettingName;
   private TextView mTextSettingDescription;
 
+  private Drawable mDefaultBackground;
+
   public FilePickerViewHolder(View itemView, SettingsAdapter adapter)
   {
     super(itemView, adapter);
@@ -29,6 +33,8 @@ public final class FilePickerViewHolder extends SettingViewHolder
   {
     mTextSettingName = root.findViewById(R.id.text_setting_name);
     mTextSettingDescription = root.findViewById(R.id.text_setting_description);
+
+    mDefaultBackground = root.getBackground();
   }
 
   @Override
@@ -37,6 +43,17 @@ public final class FilePickerViewHolder extends SettingViewHolder
     mFilePicker = (FilePicker) item;
     mItem = item;
 
+    String path = mFilePicker.getSelectedValue(getAdapter().getSettings());
+
+    if (FileBrowserHelper.isPathEmptyOrValid(path))
+    {
+      itemView.setBackground(mDefaultBackground);
+    }
+    else
+    {
+      itemView.setBackgroundResource(R.drawable.invalid_setting_background);
+    }
+
     mTextSettingName.setText(item.getNameId());
 
     if (item.getDescriptionId() > 0)
@@ -45,8 +62,6 @@ public final class FilePickerViewHolder extends SettingViewHolder
     }
     else
     {
-      String path = mFilePicker.getSelectedValue(getAdapter().getSettings());
-
       if (TextUtils.isEmpty(path))
       {
         String defaultPathRelative = mFilePicker.getDefaultPathRelativeToUserDirectory();

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ContentHandler.java

@@ -52,6 +52,24 @@ public class ContentHandler
     }
   }
 
+  public static boolean exists(@NonNull String uri)
+  {
+    try
+    {
+      final String[] projection = new String[]{Document.COLUMN_MIME_TYPE, Document.COLUMN_SIZE};
+      try (Cursor cursor = getContentResolver().query(Uri.parse(uri), projection, null, null, null))
+      {
+        return cursor != null && cursor.getCount() > 0;
+      }
+    }
+    catch (SecurityException e)
+    {
+      Log.error("Tried to check if " + uri + " exists without permission");
+    }
+
+    return false;
+  }
+
   @Nullable
   public static String getDisplayName(@NonNull Uri uri)
   {

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/FileBrowserHelper.java

@@ -14,6 +14,7 @@ import com.nononsenseapps.filepicker.Utils;
 
 import org.dolphinemu.dolphinemu.R;
 import org.dolphinemu.dolphinemu.activities.CustomFilePickerActivity;
+import org.dolphinemu.dolphinemu.features.settings.model.StringSetting;
 import org.dolphinemu.dolphinemu.ui.main.MainPresenter;
 
 import java.io.File;
@@ -94,6 +95,16 @@ public final class FileBrowserHelper
     return null;
   }
 
+  public static boolean isPathEmptyOrValid(StringSetting path)
+  {
+    return isPathEmptyOrValid(path.getStringGlobal());
+  }
+
+  public static boolean isPathEmptyOrValid(String path)
+  {
+    return !path.startsWith("content://") || ContentHandler.exists(path);
+  }
+
   public static void runAfterExtensionCheck(Context context, Uri uri, Set<String> validExtensions,
           Runnable runnable)
   {
@@ -132,6 +143,7 @@ public final class FileBrowserHelper
             .setMessage(message)
             .setPositiveButton(R.string.yes, (dialogInterface, i) -> runnable.run())
             .setNegativeButton(R.string.no, null)
+            .setCancelable(false)
             .show();
   }
 

Source/Android/app/src/main/res/drawable/invalid_setting_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:attr/selectableItemBackground"/>
+    <item>
+        <shape>
+            <solid android:color="@color/invalid_setting_overlay" />
+        </shape>
+    </item>
+</layer-list>

Source/Android/app/src/main/res/values/colors.xml

@@ -11,4 +11,6 @@
 
     <color name="tv_card_unselected">#444444</color>
 
+    <color name="invalid_setting_overlay">#36ff0000</color>
+
 </resources>

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

@@ -311,6 +311,7 @@
     <string name="clear">Clear</string>
     <string name="disabled">Disabled</string>
     <string name="other">Other</string>
+    <string name="continue_anyway">Continue Anyway</string>
 
     <!-- Game Grid Screen-->
     <string name="add_directory_title">Add Folder to Library</string>
@@ -431,6 +432,7 @@ It can efficiently compress both junk data and encrypted Wii data.
     <string name="no_file_extension">The selected file does not appear to have a file name extension.\n\nContinue anyway?</string>
     <string name="wrong_file_extension_single">The selected file has the file name extension \"%1$s\", but \"%2$s\" was expected.\n\nContinue anyway?</string>
     <string name="wrong_file_extension_multiple">The selected file has the file name extension \"%1$s\", but one of these extensions was expected: %2$s\n\nContinue anyway?</string>
+    <string name="unavailable_paths">Dolphin does not have permission to access one or more configured paths. Would you like to fix this before starting?</string>
 
     <!-- Misc -->
     <string name="pitch">Total Pitch</string>