Allow transparent widgets

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

@@ -180,6 +180,7 @@ public class ActivityWidget extends ActivityBase {
         ((TextView) inOld.findViewById(R.id.tvCount)).setText("12");
         ((TextView) inNew.findViewById(R.id.tvCount)).setText("12");
 
+        btnColor.setColor(Color.TRANSPARENT);
         setBackground();
 
         grpReady.setVisibility(View.GONE);
@@ -223,8 +224,13 @@ public class ActivityWidget extends ActivityBase {
         boolean semi = cbSemiTransparent.isChecked();
         int background = btnColor.getColor();
         if (background == Color.TRANSPARENT) {
-            inOld.setBackgroundResource(R.drawable.widget_background);
-            inNew.setBackgroundResource(R.drawable.widget_background);
+            if (semi) {
+                inOld.setBackgroundResource(R.drawable.widget_background);
+                inNew.setBackgroundResource(R.drawable.widget_background);
+            } else {
+                inOld.setBackgroundColor(background);
+                inNew.setBackgroundColor(background);
+            }
         } else {
             float lum = (float) ColorUtils.calculateLuminance(background);
             int color = (lum > 0.7 ? Color.BLACK : getResources().getColor(R.color.colorWidgetForeground));

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

@@ -112,6 +112,8 @@ public class ActivityWidgetSync extends ActivityBase {
             }
         });
 
+        btnColor.setColor(Color.TRANSPARENT);
+
         setResult(RESULT_CANCELED, resultValue);
     }
 }

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

@@ -256,6 +256,8 @@ public class ActivityWidgetUnified extends ActivityBase {
         adapterPadding.setDropDownViewResource(R.layout.spinner_item1_dropdown);
         spPadding.setAdapter(adapterPadding);
 
+        btnColor.setColor(Color.TRANSPARENT);
+
         grpReady.setVisibility(View.GONE);
         pbWait.setVisibility(View.VISIBLE);
 

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

@@ -123,7 +123,10 @@ public class Widget extends AppWidgetProvider {
                         views.setViewVisibility(R.id.tvAccount, ViewStripe.VISIBLE);
                     }
 
-                    if (background != Color.TRANSPARENT) {
+                    if (background == Color.TRANSPARENT) {
+                        if (!semi && version > 1550)
+                            views.setInt(R.id.widget, "setBackgroundColor", background);
+                    } else {
                         float lum = (float) ColorUtils.calculateLuminance(background);
 
                         if (semi)

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

@@ -48,12 +48,16 @@ public class WidgetSync extends AppWidgetProvider {
             for (int appWidgetId : appWidgetIds) {
                 boolean semi = prefs.getBoolean("widget." + appWidgetId + ".semi", true);
                 int background = prefs.getInt("widget." + appWidgetId + ".background", Color.TRANSPARENT);
+                int version = prefs.getInt("widget." + appWidgetId + ".version", 0);
 
                 RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_sync);
                 views.setOnClickPendingIntent(R.id.ivSync, pi);
                 views.setImageViewResource(R.id.ivSync, enabled ? R.drawable.twotone_sync_24 : R.drawable.twotone_sync_disabled_24);
 
-                if (background != Color.TRANSPARENT) {
+                if (background == Color.TRANSPARENT) {
+                    if (!semi && version > 1550)
+                        views.setInt(R.id.widget, "setBackgroundColor", background);
+                } else {
                     float lum = (float) ColorUtils.calculateLuminance(background);
 
                     if (semi)

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

@@ -95,7 +95,10 @@ public class WidgetUnified extends AppWidgetProvider {
 
             views.setPendingIntentTemplate(R.id.lv, piItem);
 
-            if (background != Color.TRANSPARENT) {
+            if (background == Color.TRANSPARENT) {
+                if (!semi && version > 1550)
+                    views.setInt(R.id.widget, "setBackgroundColor", background);
+            } else {
                 float lum = (float) ColorUtils.calculateLuminance(background);
 
                 if (semi)