Improved account selection layout

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

@@ -24,8 +24,16 @@ import static android.app.Activity.RESULT_OK;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
+import android.text.SpannableStringBuilder;
+import android.text.style.ImageSpan;
+import android.view.View;
+import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
+import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -37,7 +45,38 @@ public class FragmentDialogSelectAccount extends FragmentDialogBase {
     @NonNull
     @Override
     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
-        final ArrayAdapter<EntityAccount> adapter = new ArrayAdapter<>(getContext(), R.layout.spinner_item1, android.R.id.text1);
+        final Context context = getContext();
+
+        final int dp6 = Helper.dp2pixels(context, 6);
+        final int iconSize = context.getResources().getDimensionPixelSize(R.dimen.menu_item_icon_size);
+
+        final ArrayAdapter<EntityAccount> adapter = new ArrayAdapter<EntityAccount>(context, R.layout.spinner_item1, android.R.id.text1) {
+
+            @NonNull
+            @Override
+            public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
+                View view = super.getView(position, convertView, parent);
+
+                if (getCount() > 10)
+                    view.setPadding(dp6, dp6, dp6, dp6);
+
+                TextView tv = view.findViewById(android.R.id.text1);
+
+                EntityAccount account = (EntityAccount) getItem(position);
+                SpannableStringBuilder ssb = new SpannableStringBuilderEx(account.name);
+
+                Drawable d = new ColorDrawable(account.color == null ? Color.TRANSPARENT : account.color);
+                d.setBounds(0, 0, iconSize / 4, iconSize);
+
+                ImageSpan imageSpan = new CenteredImageSpan(d);
+                ssb.insert(0, "\uFFFC\u2002"); // object replacement character, en space
+                ssb.setSpan(imageSpan, 0, 1, 0);
+
+                tv.setText(ssb);
+
+                return view;
+            }
+        };
 
         // TODO: spinner
         new SimpleTask<List<EntityAccount>>() {
@@ -62,7 +101,7 @@ public class FragmentDialogSelectAccount extends FragmentDialogBase {
             }
         }.execute(this, getArguments(), "messages:accounts");
 
-        return new AlertDialog.Builder(getContext())
+        return new AlertDialog.Builder(context)
                 .setIcon(R.drawable.twotone_account_circle_24)
                 .setTitle(R.string.title_list_accounts)
                 .setAdapter(adapter, new DialogInterface.OnClickListener() {