Cache themed contexts

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

@@ -36,6 +36,7 @@ import android.os.SystemClock;
 import android.os.strictmode.Violation;
 import android.text.TextUtils;
 import android.util.Printer;
+import android.view.ContextThemeWrapper;
 import android.webkit.CookieManager;
 
 import androidx.annotation.NonNull;
@@ -65,6 +66,7 @@ public class ApplicationEx extends Application
     private Thread.UncaughtExceptionHandler prev = null;
 
     private static final Object lock = new Object();
+    private static final Map<Integer, Context> themeCache = new HashMap<>();
 
     @Override
     protected void attachBaseContext(Context base) {
@@ -120,6 +122,17 @@ public class ApplicationEx extends Application
         return context;
     }
 
+    static Context getThemedContext(Context context, int style) {
+        synchronized (themeCache) {
+            Context tcontext = themeCache.get(style);
+            if (tcontext == null) {
+                tcontext = new ContextThemeWrapper(context.getApplicationContext(), style);
+                themeCache.put(style, tcontext);
+            }
+            return tcontext;
+        }
+    }
+
     @NonNull
     public androidx.work.Configuration getWorkManagerConfiguration() {
         return new androidx.work.Configuration.Builder()

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

@@ -71,7 +71,6 @@ public class EditTextMultiAutoComplete extends AppCompatMultiAutoCompleteTextVie
     private SharedPreferences prefs;
     private boolean dark;
     private int colorAccent;
-    private ContextThemeWrapper ctx;
     private Tokenizer tokenizer;
     private Map<String, Integer> encryption = new ConcurrentHashMap<>();
 
@@ -106,7 +105,6 @@ public class EditTextMultiAutoComplete extends AppCompatMultiAutoCompleteTextVie
         dark = Helper.isDarkTheme(context);
         colorAccent = Helper.resolveColor(context, androidx.appcompat.R.attr.colorAccent);
         colorAccent = ColorUtils.setAlphaComponent(colorAccent, 5 * 255 / 100);
-        ctx = new ContextThemeWrapper(context.getApplicationContext(), dark ? R.style.ChipDark : R.style.ChipLight);
 
         addTextChangedListener(new TextWatcher() {
             private Integer backspace = null;
@@ -346,6 +344,7 @@ public class EditTextMultiAutoComplete extends AppCompatMultiAutoCompleteTextVie
                                     String text = (TextUtils.isEmpty(personal) ? email : personal);
 
                                     // https://github.com/material-components/material-components-android/blob/master/docs/components/Chip.md
+                                    Context ctx = ApplicationEx.getThemedContext(context, dark ? R.style.ChipDark : R.style.ChipLight);
                                     ChipDrawable cd = ChipDrawable.createFromResource(ctx, R.xml.chip);
                                     cd.setChipIcon(avatar);
                                     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)

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

@@ -19,14 +19,12 @@ package eu.faircode.email;
     Copyright 2018-2024 by Marcel Bokhorst (M66B)
 */
 
-import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.PowerManager;
 import android.text.Spanned;
-import android.view.ContextThemeWrapper;
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
@@ -68,9 +66,6 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
     private Handler handler = null;
 
     private static PowerManager.WakeLock wl = null;
-    private static int themeId = -1;
-    @SuppressLint("StaticFieldLeak")
-    private static Context themedContext = null;
     private static final List<SimpleTask> tasks = new ArrayList<>();
 
     private static final ExecutorService serialExecutor =
@@ -215,11 +210,7 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
             int themeId = ((ActivityBase) context).getThemeId();
             if (themeId == 0)
                 themeId = context.getApplicationInfo().theme;
-            if (SimpleTask.themedContext == null || SimpleTask.themeId != themeId) {
-                SimpleTask.themeId = themeId;
-                SimpleTask.themedContext = new ContextThemeWrapper(context.getApplicationContext(), themeId);
-            }
-            tcontext = SimpleTask.themedContext;
+            tcontext = ApplicationEx.getThemedContext(context, themeId);
         } else
             tcontext = context.getApplicationContext();