GlideWidgetProvider.java

public class WidgetProvider extends AppWidgetProvider {

    @StringDef({Actions.MANUAL_REFRESH, Actions.DETAIL_ACTIVITY, Actions.RECONFIGURATION_ACTIVITY})
    @Retention(RetentionPolicy.SOURCE)
    private @interface Actions {
        String MANUAL_REFRESH = BuildConfig.APPLICATION_ID + ".widget.MANUAL_REFRESH_ACTION";
        String DETAIL_ACTIVITY = BuildConfig.APPLICATION_ID + ".widget.DETAIL_ACTIVITY_ACTION";
        String RECONFIGURATION_ACTIVITY = BuildConfig.APPLICATION_ID + ".widget.RECONFIGURATION_ACTIVITY_ACTION";
    }

    private static final String SET_COLOR_FILTER = "setColorFilter";
    private static final String SET_BACKGROUND_COLOR = "setBackgroundColor";

    private static final int WIDGET_IMAGE_SIZE = 720;

    @Override
    public void onUpdate(final Context context, final AppWidgetManager appWidgetManager, final int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);

        for (final int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId, true, false);
        }
    }

    @Override
    public void onAppWidgetOptionsChanged(final Context context, final AppWidgetManager appWidgetManager, final int appWidgetId, final Bundle newOptions) {
        super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId, newOptions);

        updateAppWidget(context, appWidgetManager, appWidgetId, true, false);
    }

    @Override
    public void onDeleted(final Context context, final int[] appWidgetIds) {
        super.onDeleted(context, appWidgetIds);

        for (final int appWidgetId : appWidgetIds) {
            cancelAutoRefreshAlarm(context, appWidgetId);
        }
    }

    @Override
    public void onReceive(@NonNull final Context context, @NonNull final Intent intent) {
        super.onReceive(context, intent);

        final int appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);

        switch (intent.getAction()) {
            case Actions.MANUAL_REFRESH:
                updateAppWidget(context, AppWidgetManager.getInstance(context), appWidgetId, false, true);
                break;

            case Actions.DETAIL_ACTIVITY:
                final Intent detailActivityIntent = new Intent(context, DetailActivity.class);
                detailActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_NAME, WidgetsUtils.loadStringPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_NAME));
                detailActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_URL, WidgetsUtils.loadStringPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_URL));
                detailActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(detailActivityIntent);
                break;

            case Actions.RECONFIGURATION_ACTIVITY:
                final Intent configurationActivityIntent = new Intent(context, WebCamsWidgetReConfigure.class);
                configurationActivityIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
                configurationActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_NAME, WidgetsUtils.loadStringPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_NAME));
                configurationActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_INTERVAL, WidgetsUtils.loadIntPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_INTERVAL));
                configurationActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_TOP_BAR_HIDE, WidgetsUtils.loadBooleanPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_TOP_BAR_HIDE));

                final int textColor = WidgetsUtils.loadIntPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_TEXT_COLOR);
                if (textColor != 0) {
                    configurationActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_TEXT_COLOR, textColor);
                }

                final int backgroundColor = WidgetsUtils.loadIntPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_BACKGROUND_COLOR);
                if (backgroundColor != 0) {
                    configurationActivityIntent.putExtra(WidgetsUtils.Key.WIDGET_BACKGROUND_COLOR, backgroundColor);
                }

                configurationActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(configurationActivityIntent);
                break;
        }
    }

    private void updateAppWidget(final Context context, final AppWidgetManager appWidgetManager,
                                 final int appWidgetId, final boolean resetRefreshAlarm, final boolean hideRefreshButton) {
        final RemoteViews widgetLayout = new RemoteViews(context.getPackageName(), R.layout.widget_layout);

        final PendingIntent refreshPendingIntent = getPendingIntent(context, appWidgetId, Actions.MANUAL_REFRESH);

        final String name = WidgetsUtils.loadStringPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_NAME);
        final String url = WidgetsUtils.loadStringPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_URL);
        final int textColor = WidgetsUtils.loadIntPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_TEXT_COLOR);
        final int backgroundColor = WidgetsUtils.loadIntPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_BACKGROUND_COLOR);
        final int refreshInterval = WidgetsUtils.loadIntPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_INTERVAL);
        final boolean topBarHide = WidgetsUtils.loadBooleanPref(context, appWidgetId, WidgetsUtils.Key.WIDGET_TOP_BAR_HIDE);

        widgetLayout.setViewVisibility(R.id.widgetUpdateButton, hideRefreshButton ? View.GONE : View.VISIBLE);

        widgetLayout.setOnClickPendingIntent(R.id.widgetWebCamImage, getPendingIntent(context, appWidgetId, Actions.DETAIL_ACTIVITY));
        widgetLayout.setOnClickPendingIntent(R.id.widgetConfigureButton, getPendingIntent(context, appWidgetId, Actions.RECONFIGURATION_ACTIVITY));
        widgetLayout.setOnClickPendingIntent(R.id.widgetUpdateButton, refreshPendingIntent);

        widgetLayout.setTextViewText(R.id.widgetTitle, name);
        if (textColor != 0) {
            widgetLayout.setTextColor(R.id.widgetTitle, textColor);
            widgetLayout.setTextColor(R.id.widgetUpdateTime, textColor);
            widgetLayout.setTextColor(R.id.widgetRefreshInfoText, textColor);
            widgetLayout.setInt(R.id.widgetConfigureButton, SET_COLOR_FILTER, textColor);
        }
        if (backgroundColor != 0) {
            widgetLayout.setInt(R.id.widgetUpdateButton, SET_COLOR_FILTER, backgroundColor);
            widgetLayout.setInt(R.id.widgetButtonsContainer, SET_BACKGROUND_COLOR, backgroundColor);
            widgetLayout.setInt(R.id.widgetBackgroundLayout, SET_BACKGROUND_COLOR, backgroundColor);
        }
        widgetLayout.setViewVisibility(R.id.widgetButtonsContainer, topBarHide ? View.GONE : View.VISIBLE);

        if (resetRefreshAlarm) {
            cancelAutoRefreshAlarm(context, appWidgetId);
            if (refreshInterval != 0) {
                final AlarmManager alarmManager = (AlarmManager) context.getApplicationContext().getSystemService(Context.ALARM_SERVICE);
                if (alarmManager != null) {
                    alarmManager.setRepeating(AlarmManager.RTC, System.currentTimeMillis() + 1000, refreshInterval, refreshPendingIntent); // one second delay
                }
            }
        }

        loadImage(context, widgetLayout, appWidgetManager, appWidgetId, url);
        appWidgetManager.updateAppWidget(appWidgetId, widgetLayout);
    }

    private void loadImage(final Context context, final RemoteViews widgetLayout, final AppWidgetManager appWidgetManager, final int appWidgetId, final String url) {
        final AppWidgetTarget appWidgetTarget = new AppWidgetTarget(context.getApplicationContext(), WIDGET_IMAGE_SIZE, WIDGET_IMAGE_SIZE, R.id.widgetWebCamImage, widgetLayout, appWidgetId);

        GlideApp.with(context.getApplicationContext()) // ApplicationContext is safer!
                .asBitmap()
                .load(WebCamsGlideExtensions.getGlideUrlWithHeaders(url))
                .skipMemoryAndDiskCache()
                .listener(new RequestListener<Bitmap>() {
                    @Override
                    public boolean onLoadFailed(@Nullable final GlideException e, final Object model,
                                                final Target<Bitmap> target, final boolean isFirstResource) {
                        return updateWidget();
                    }

                    @Override
                    public boolean onResourceReady(final Bitmap resource, final Object model, final Target<Bitmap> target,
                                                   final DataSource dataSource, final boolean isFirstResource) {
                        widgetLayout.setTextViewText(R.id.widgetUpdateTime, Utils.getCustomDateString(getPattern(context)));
                        return updateWidget();
                    }

                    private boolean updateWidget() {
                        widgetLayout.setViewVisibility(R.id.widgetUpdateButton, View.VISIBLE);
                        appWidgetManager.updateAppWidget(appWidgetId, widgetLayout);
                        return false;
                    }
                })
                .into(appWidgetTarget);
    }

    private PendingIntent getPendingIntent(final @NonNull Context context, final int appWidgetId, final @NonNull String action) {
        final Intent intent = new Intent(context, WebCamsWidgetProvider.class);
        intent.setAction(action);
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
        intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
        return PendingIntent.getBroadcast(context.getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    private void cancelAutoRefreshAlarm(final Context context, final int appWidgetId) {
        final AlarmManager alarmManager = (AlarmManager) context.getApplicationContext().getSystemService(Context.ALARM_SERVICE);
        if (alarmManager != null) {
            alarmManager.cancel(getPendingIntent(context.getApplicationContext(), appWidgetId, Actions.MANUAL_REFRESH));
        }
    }

    private String getPattern(final Context context) {
        return DateFormat.is24HourFormat(context.getApplicationContext()) ? "HH:mm:ss" : "K:mm a";
    }
}