Added button to show device's charsets

app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java

@@ -23,6 +23,7 @@ import android.app.ActivityManager;
 import android.app.NotificationManager;
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
@@ -41,6 +42,7 @@ import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.SwitchCompat;
 import androidx.constraintlayout.widget.Group;
 import androidx.lifecycle.Lifecycle;
@@ -48,6 +50,9 @@ import androidx.lifecycle.Observer;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import androidx.preference.PreferenceManager;
 
+import java.nio.charset.Charset;
+import java.util.SortedMap;
+
 import io.requery.android.database.sqlite.SQLiteDatabase;
 
 public class FragmentOptionsMisc extends FragmentBase implements SharedPreferences.OnSharedPreferenceChangeListener {
@@ -74,6 +79,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private TextView tvMemoryClass;
     private TextView tvStorageSpace;
     private TextView tvFingerprint;
+    private Button btnCharsets;
 
     private Group grpDebug;
 
@@ -123,6 +129,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         tvMemoryClass = view.findViewById(R.id.tvMemoryClass);
         tvStorageSpace = view.findViewById(R.id.tvStorageSpace);
         tvFingerprint = view.findViewById(R.id.tvFingerprint);
+        btnCharsets = view.findViewById(R.id.btnCharsets);
 
         grpDebug = view.findViewById(R.id.grpDebug);
 
@@ -278,6 +285,40 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             }
         });
 
+        btnCharsets.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                new SimpleTask<SortedMap<String, Charset>>() {
+                    @Override
+                    protected SortedMap<String, Charset> onExecute(Context context, Bundle args) {
+                        return Charset.availableCharsets();
+                    }
+
+                    @Override
+                    protected void onExecuted(Bundle args, SortedMap<String, Charset> charsets) {
+                        StringBuilder sb = new StringBuilder();
+                        for (String key : charsets.keySet())
+                            sb.append(charsets.get(key).displayName()).append("\r\n");
+                        new AlertDialog.Builder(getContext())
+                                .setTitle(R.string.title_advanced_charsets)
+                                .setMessage(sb.toString())
+                                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                                    @Override
+                                    public void onClick(DialogInterface dialog, int which) {
+                                        // Do nothing
+                                    }
+                                })
+                                .show();
+                    }
+
+                    @Override
+                    protected void onException(Bundle args, Throwable ex) {
+                        Log.unexpectedError(getParentFragmentManager(), ex);
+                    }
+                }.execute(FragmentOptionsMisc.this, new Bundle(), "setup:charsets");
+            }
+        });
+
         tvFtsIndexed.setText(null);
 
         DB db = DB.getInstance(getContext());

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

@@ -352,10 +352,20 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvStorageSpace" />
 
+        <Button
+            android:id="@+id/btnCharsets"
+            style="?android:attr/buttonStyleSmall"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_advanced_charsets"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvFingerprint" />
+
         <androidx.constraintlayout.widget.Group
             android:id="@+id/grpDebug"
             android:layout_width="0dp"
             android:layout_height="0dp"
-            app:constraint_referenced_ids="tvProcessors,tvMemoryClass,tvStorageSpace,tvFingerprint" />
+            app:constraint_referenced_ids="tvProcessors,tvMemoryClass,tvStorageSpace,tvFingerprint,btnCharsets" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>

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

@@ -444,11 +444,12 @@
     <string name="title_advanced_crash_reports">Send error reports</string>
     <string name="title_advanced_debug">Debug mode</string>
     <string name="title_advanced_cleanup">Cleanup</string>
+    <string name="title_advanced_last_cleanup">Last cleanup: %1$s</string>
     <string name="title_advanced_more">More options</string>
     <string name="title_advanced_processors" translatable="false">Processors: %1$d</string>
     <string name="title_advanced_memory_class" translatable="false">Memory class: %1$s</string>
     <string name="title_advanced_storage_space" translatable="false">Storage space: %1$s/%2$s</string>
-    <string name="title_advanced_last_cleanup">Last cleanup: %1$s</string>
+    <string name="title_advanced_charsets" translatable="false">Charsets</string>
 
     <string name="title_advanced_enabled_hint">Globally disable or enable receiving of messages</string>
     <string name="title_advanced_manual_hint">If synchronization is disabled, it is still possible to synchronize manually by pulling down the message list.</string>