Android Problem loading widget - without errors in the logcat

Question

I created an analog clock widget in java, and for some reason I get "Problem loading widget" all the time, the only things I get from the logcat when I try to place the widget are:

2020-11-18 19:19:13.162 9482-9482/? E/Zygote: isWhitelistProcess - Process is Whitelisted
2020-11-18 19:19:13.162 9482-9482/? E/Zygote: accessInfo : 1
2020-11-18 19:19:13.166 9482-9482/? I/ckcustomizatio: Late-enabling -Xcheck:jni
2020-11-18 19:19:13.182 9482-9482/? E/ckcustomizatio: Unknown bits set in runtime_flags: 0x8000
2020-11-18 19:19:13.196 9482-9482/com.l_es.analogclockcustomization D/ActivityThread: setConscryptValidator
2020-11-18 19:19:13.196 9482-9482/com.l_es.analogclockcustomization D/ActivityThread: setConscryptValidator - put

and the widget is only a black square with "Problem loading widget" on it.

here is the widget class:

public class MainWidget extends AppWidgetProvider {

    static RemoteViews views;
    //preferences
    private static SharedPreferences custClockPrefs;
    //number of possible designs
    private static int numClocks;
    //IDs of Analog Clock elements
    static int[] clockDesigns;

    public void onReceive(Context context, Intent intent) {

        numClocks = context.getResources().getInteger(R.integer.num_clocks);
        clockDesigns = new int[numClocks];
        for(int d = 0; d < numClocks; d++){
            clockDesigns[d] = context.getResources().getIdentifier
                    ("AnalogClock"+d, "id", context.getPackageName());
        }
        //find out the action
        String action = intent.getAction();
        //is it time to update
        if(AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals(action)) {
            views = new RemoteViews(context.getPackageName(),
                    R.layout.clock_widget_layout);

            AppWidgetManager.getInstance(context).updateAppWidget
                    (intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS), views);

            custClockPrefs = context.getSharedPreferences("CustomClockPrefs", 0);
            int chosenDesign = custClockPrefs.getInt("clockdesign", 0);
            if(chosenDesign >= 0){
                for(int d = 0; d < numClocks; d++){
                    if(d != chosenDesign)
                        views.setViewVisibility(clockDesigns[d], View.INVISIBLE);
                }
                views.setViewVisibility(clockDesigns[chosenDesign], View.VISIBLE);
            }

            Intent choiceIntent = new Intent(context, ClockChoice.class);
            PendingIntent clickPendIntent = PendingIntent.getActivity
                    (context, 0, choiceIntent, PendingIntent.FLAG_UPDATE_CURRENT);
            views.setOnClickPendingIntent(R.id.custom_clock_widget, clickPendIntent);

        }
    }

}

here is the draw function I use in order to draw the clock:

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    final float w = (float) getWidth() / 2;
    final float h = (float) getHeight() / 2;

    final int saveCount = canvas.save();
    canvas.translate(w, h);
    final float scale = Math.min((float) w / mDial.getIntrinsicWidth(),
            (float) h / mDial.getIntrinsicHeight());
    if (scale < 1f) {
        canvas.scale(scale, scale, 0f, 0f);
    }
    mDial.draw(canvas);

    final float hourAngle = mTime.get(Calendar.HOUR) * 30f;
    canvas.rotate(hourAngle, 0f, 0f);
    mHourHand.draw(canvas);

    final float minuteAngle = mTime.get(Calendar.MINUTE) * 6f;
    canvas.rotate(minuteAngle - hourAngle, 0f, 0f);
    mMinuteHand.draw(canvas);

    if (mEnableSeconds) {
        final float secondAngle = mTime.get(Calendar.SECOND) * 6f;
        canvas.rotate(secondAngle - minuteAngle, 0f, 0f);
        mSecondHand.draw(canvas);
    }
    canvas.restoreToCount(saveCount);
}

Here is my layout file of the widget, keep in mind that I set at every time 2 out of the 3 to be with visibility of "gone":

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/custom_clock_widget"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="@dimen/clock_margin"
    android:gravity="center">

    <com.l_es.analogclockcustomization.AnalogClockDesign
        android:id="@+id/AnalogClock0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:showSecondHand="false"
        app:dial="@drawable/clock_dial_2"
        app:hour="@drawable/clock_hour_hand_2"
        app:minute="@drawable/clock_minute_hand_2"/>

    <com.l_es.analogclockcustomization.AnalogClockDesign
        android:id="@+id/AnalogClock1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:showSecondHand="false"
        app:dial="@drawable/clock_dial_3"
        app:hour="@drawable/clock_hour_hand_3"
        app:minute="@drawable/clock_minute_hand_3"/>

    <com.l_es.analogclockcustomization.AnalogClockDesign
        android:id="@+id/AnalogClock2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:showSecondHand="false"
        app:dial="@drawable/clock_dial_4"
        app:hour="@drawable/clock_hour_hand_4"
        app:minute="@drawable/clock_minute_hand_4"/>

</RelativeLayout>

clock_widget.xml:

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/clock_widget_layout"
    android:minWidth="146dp"
    android:minHeight="146dp"
    android:previewImage="@mipmap/ic_launcher"
    android:resizeMode="vertical|horizontal"
    android:updatePeriodMillis="0"
    android:widgetCategory="home_screen">
</appwidget-provider>

Answer 1

Check elements you used in the view in a Widget..

Documentation link

A RemoteViews object (and, consequently, an App Widget) can support the following layout classes:

• FrameLayout

• LinearLayout

• RelativeLayout

• GridLayout

And the following widget classes:

1. AnalogClock
2. Button
3. Chronometer
4. ImageButton
5. ImageView
6. ProgressBar
7. TextView
8. ViewFlipper
9. ListView
10. GridView
11. StackView
12. AdapterViewFlipper

Using forbidden elements causes this very

Problem Loading Widget message, without saying where did it happen.