Implement android widget

AndroidManifest.xml

        <receiver android:name=".MyAppWidgetProvider">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/appwidget_info" />
        </receiver>

appwidget.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/iv_appwidget"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:src="@drawable/ic_launcher"
        android:layout_gravity="center"
        />
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:paddingTop="7dp"
        android:gravity="center"
        android:text="@string/widget_label"
        android:textColor="@android:color/white"
        android:shadowColor="@android:color/black"
        android:shadowRadius="2"/>
</LinearLayout>

appwidget_info.xml

<?xml version="1.0" encoding="utf-8"?>

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="48dp"
    android:minHeight="48dp"
    android:updatePeriodMillis="0"
    android:previewImage="@drawable/ic_launcher"
    android:initialLayout="@layout/appwidget"
    android:widgetCategory="home_screen"
    android:resizeMode="horizontal|vertical">

</appwidget-provider>

AppWidgetProvider.java

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

public class MyAppWidgetProvider extends AppWidgetProvider {
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        Intent intent = new Intent(context, AIntentService.class);
        PendingIntent pi = PendingIntent.getService(context, 0, intent, 0);

        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget);
        views.setOnClickPendingIntent(R.id.iv_appwidget, pi);

        appWidgetManager.updateAppWidget(appWidgetIds[0], views);
    }
}