Method onUpdate

app/src/main/java/eu/faircode/email/WidgetSync.java:37–101

(final Context context, final AppWidgetManager appWidgetManager, final int[] appWidgetIds)

public class WidgetSync extends AppWidgetProvider {
    @Override
    public void onUpdate(final Context context, final AppWidgetManager appWidgetManager, final int[] appWidgetIds) {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        boolean enabled = prefs.getBoolean("enabled", true);
        boolean connected = prefs.getBoolean("connected", false);

        try {
            Intent intent = new Intent(context, ServiceSynchronize.class)
                    .setAction("enable")
                    .putExtra("enabled", !enabled);
            PendingIntent pi = PendingIntentCompat.getForegroundService(
                    context, ServiceSynchronize.PI_ENABLE, intent, PendingIntent.FLAG_UPDATE_CURRENT);

            int colorWidgetForeground = context.getResources().getColor(R.color.colorWidgetForeground);

            for (int appWidgetId : appWidgetIds) {
                boolean daynight = prefs.getBoolean("widget." + appWidgetId + ".daynight", false);
                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);

                if (version <= 1550)
                    semi = true; // Legacy

                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);
                views.setInt(R.id.ivSync, "setImageAlpha",
                        !enabled || connected ? 255 : Math.round(Helper.LOW_LIGHT * 255));

                if (!daynight && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
                    views.setColorStateListAttr(R.id.background, "setBackgroundTintList", 0);

                if (daynight && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                    views.setInt(R.id.background, "setBackgroundColor", Color.WHITE);
                    views.setColorStateListAttr(R.id.background, "setBackgroundTintList", android.R.attr.colorBackground);
                    views.setColorAttr(R.id.ivSync, "setColorFilter", android.R.attr.textColorPrimary);
                } else if (background == Color.TRANSPARENT) {
                    if (semi)
                        views.setInt(R.id.background, "setBackgroundResource", R.drawable.widget_background);
                    else
                        views.setInt(R.id.background, "setBackgroundColor", background);
                    views.setInt(R.id.ivSync, "setColorFilter", colorWidgetForeground);
                } else {
                    float lum = (float) ColorUtils.calculateLuminance(background);

                    if (semi)
                        background = ColorUtils.setAlphaComponent(background, 127);

                    views.setInt(R.id.background, "setBackgroundColor", background);

                    int fg = (lum > 0.7f ? Color.BLACK : colorWidgetForeground);
                    views.setInt(R.id.ivSync, "setColorFilter", fg);
                }

                int dp6 = Helper.dp2pixels(context, 6);
                views.setViewPadding(R.id.content, dp6, dp6, dp6, dp6);