How To Use Listview In A Widget?

I am trying to create a listview loaded from rss feeds into a widget? Does anyone know of a tutorial on how to use a listview in a wigdet? Or maybe someone could provide 1.

Solution 1:

Basically, you need to use two components:

1. RemoteViewsFactory: This is the especial adapter.
2. RemoteViewsService: This is to return the first one.

Let's create the RemoteViewsFactory class:

publicclassMyWidgetRemoteViewsFactoryimplementsRemoteViewsService.RemoteViewsFactory {

    private Context mContext;
    private Cursor mCursor;

    publicMyWidgetRemoteViewsFactory(Context applicationContext, Intent intent) {
        mContext = applicationContext;
    }

    @OverridepublicvoidonCreate() {

    }

    @OverridepublicvoidonDataSetChanged() {

        if (mCursor != null) {
            mCursor.close();
        }

        finallongidentityToken= Binder.clearCallingIdentity();
        Uriuri= Contract.PATH_TODOS_URI;
        mCursor = mContext.getContentResolver().query(uri,
                null,
                null,
                null,
                Contract._ID + " DESC");

        Binder.restoreCallingIdentity(identityToken);

    }

    @OverridepublicvoidonDestroy() {
        if (mCursor != null) {
            mCursor.close();
        }
    }

    @OverridepublicintgetCount() {
        returnmCursor== null ? 0 : mCursor.getCount();
    }

    @Overridepublic RemoteViews getViewAt(int position) {
        if (position == AdapterView.INVALID_POSITION ||
                mCursor == null || !mCursor.moveToPosition(position)) {
            returnnull;
        }

        RemoteViewsrv=newRemoteViews(mContext.getPackageName(), R.layout.collection_widget_list_item);
        rv.setTextViewText(R.id.widgetItemTaskNameLabel, mCursor.getString(1));

        return rv;
    }

    @Overridepublic RemoteViews getLoadingView() {
        returnnull;
    }

    @OverridepublicintgetViewTypeCount() {
        return1;
    }

    @OverridepubliclonggetItemId(int position) {
        return mCursor.moveToPosition(position) ? mCursor.getLong(0) : position;
    }

    @OverridepublicbooleanhasStableIds() {
        returntrue;
    }

}

Now it's time for the RemoteViewsService (the easy one):

publicclassMyWidgetRemoteViewsServiceextendsRemoteViewsService {
    @Overridepublic RemoteViewsFactory onGetViewFactory(Intent intent) {
        returnnewMyWidgetRemoteViewsFactory(this.getApplicationContext(), intent);
    }
}

Also you must register this service in the androidManifest.xml:

<serviceandroid:name=".AppWidget.MyWidgetRemoteViewsService"android:permission="android.permission.BIND_REMOTEVIEWS"></service>

And now in your Widget class which extends AppWidgetProvider, you can manage the layouts:

@OverridepublicvoidonUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    for (int appWidgetId : appWidgetIds) {
        RemoteViewsviews=newRemoteViews(
                context.getPackageName(),
                R.layout.collection_widget
        );
        Intentintent=newIntent(context, MyWidgetRemoteViewsService.class);
        views.setRemoteAdapter(R.id.widgetListView, intent);
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }
}

Now create a new resource file in res/xml and name it collection_widget.xml:

<appwidget-providerxmlns:android="http://schemas.android.com/apk/res/android"android:minWidth="40dp"android:minHeight="40dp"android:updatePeriodMillis="864000"android:previewImage="@drawable/simple_widget_preview"android:initialLayout="@layout/collection_widget"android:resizeMode="horizontal|vertical"android:widgetCategory="home_screen"></appwidget-provider>

We need to create two more files in res/layout to define the layout of the list and the layout of each list item.

collection_widget.xml:

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@color/colorWhite"xmlns:tools="http://schemas.android.com/tools"android:orientation="vertical"><FrameLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><TextViewandroid:layout_width="match_parent"android:id="@+id/widgetTitleLabel"android:text="@string/title_collection_widget"android:textColor="@color/colorWhite"android:background="@color/colorPrimary"android:textSize="18dp"android:gravity="center"android:textAllCaps="true"android:layout_height="@dimen/widget_title_min_height"></TextView></FrameLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><ListViewandroid:id="@+id/widgetListView"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@color/colorWhite"android:dividerHeight="1dp"android:divider="#eeeeee"tools:listitem="@layout/collection_widget_list_item"></ListView></LinearLayout></LinearLayout>

collection_widget_list_item.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:paddingLeft="@dimen/widget_listview_padding_x"
    android:paddingRight="@dimen/widget_listview_padding_x"
    android:paddingStart="@dimen/widget_listview_padding_x"
    android:paddingEnd="@dimen/widget_listview_padding_x"
    android:minHeight="@dimen/widget_listview_item_height"
    android:weightSum="2"
    android:id="@+id/widgetItemContainer"
    android:layout_height="wrap_content">

    <TextView android:id="@+id/widgetItemTaskNameLabel"
        android:layout_width="wrap_content"
        android:gravity="start"
        android:layout_weight="1"
        android:textColor="@color/text"
        android:layout_gravity="center_vertical"
        android:layout_height="wrap_content"></TextView>

</LinearLayout>

---

I use this article like example and works like a charm for me!!

https://www.sitepoint.com/killer-way-to-show-a-list-of-items-in-android-collection-widget/

Now a days, this is not that rare. Hope to help someone.

Solution 2:

I am trying to create a listview loaded from rss feeds into a widget?

This is only possible on Honeycomb. Earlier versions of Android did not support this, and it remains to be seen if it will be supported on phones going forward.

Does anyone know of a tutorial on how to use a listview in a wigdet?

The WeatherListWidget sample is in your SDK and is lightly explained in the documentation.