Android widgets not showing on screen

Question

I am trying to make a simple widget but when I want to put it in the screen it just disappear. I tried this on Api : 23,26 and 30 ,it's all give me the same result.

Manifest.xml

<receiver android:name=".mAppWidgetProvider">

        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
        </intent-filter>

        <meta-data android:name="android.appwidget.provider"
            android:resource="@xml/widget_info"/>

    </receiver>

widget_info.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:configure="com.app24.test.mAppWidgetProvider"
android:initialLayout="@layout/my_widget"
android:minWidth="250dp"
android:minHeight="70dp"
android:resizeMode="horizontal|vertical"
android:updatePeriodMillis="10000"
android:widgetCategory="home_screen">
</appwidget-provider>

mAppWidgetProvider

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;

public class mAppWidgetProvider extends AppWidgetProvider {

}

my_widget (the layout)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:background="@color/white"
android:padding="8dp">

<TextView
    android:text="Hello world"
    android:textSize="24sp"
    android:layout_weight="1"
    android:gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

<Button
    android:text="Click me!"
    android:layout_weight="1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

<Button
    android:text="Click me!"
    android:layout_weight="1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

</LinearLayout>

and I have tried the other solutions but no thing.

Answer 1

check out logcat and look for some Exception. App widgets are crashing "silently" without any dialog, just doesn't appear. But you should be able to find cause of problem in logs

in your code I see one wrong line:

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    ...
    android:configure="com.app24.test.mAppWidgetProvider"
    ...

android:configure should point on some Activity, which will be started when your widget will be added to home screen. your line points wrongly on your custom AppWidgetProvider, which isn't an Acticity - system probably tries to start this class as Activity or maybe checks instanceof and as this class isn't Activity then crash occurs. try to remove this line for start (or point on proper class)