如何在聊天应用程序小部件中显示最新消息

Question

我使用android开发了聊天应用程序，现在可以正常工作了，我想在主屏幕小部件中显示最新消息，但不显示任何相关信息。我希望用户可以在此小部件中看到最新消息，我该怎么做？ 这是我的代码

public class NewAppWidget extends AppWidgetProvider {

    private static final String ACTION_BROADCASTWIIDGET = "ACTION_BROADCASTWIIDGET";
    RemoteViews views;

    private void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                                 int appWidgetId) {
        //Construct the RemoteViews object
        views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);
        Intent mainIntent = new Intent(context, MainActivity.class);
        PendingIntent mainPendingIntent = PendingIntent.getActivity(context, 0, mainIntent, 0);
        new DownloadBitmap(views).execute(" TXTME chat");
        views.setOnClickPendingIntent(R.id.widget_title, mainPendingIntent);
        Intent intent = new Intent(context, NewAppWidget.class);
        intent.setAction(ACTION_BROADCASTWIIDGET);

        context.sendBroadcast(intent);

        appWidgetManager.updateAppWidget(appWidgetId, views);
    }


    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);
        if (ACTION_BROADCASTWIIDGET.equals(intent.getAction())) {
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);
            views.setTextViewText(R.id.information, getInformation());
            ComponentName appWidget = new ComponentName(context, NewAppWidget.class);
            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
            appWidgetManager.updateAppWidget(appWidget, views);
        }
    }

    private String getInformation() {

        DatabaseReference databaseReference =
                FirebaseDatabase.getInstance().getReference().child("users");
        databaseReference.orderByChild("email").equalTo("Yasmeenahmed@gmail.com").addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                try {
                    MessageModel m = dataSnapshot.getChildren().iterator().next().getValue(MessageModel.class);
                    Log.d("user:", m.getName());
                    views.setTextViewText(R.id.admin, m.getName() + '\n' + m.getName());
                } catch (Throwable b) { } }
            @Override
            public void onCancelled(DatabaseError databaseError) {
                Log.w("", "load message:onCancelled");
            }
        });
        return "";
    }
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        // There may be multiple widgets active, so update all of them
        for (int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId);
        } super.onUpdate(context, appWidgetManager, appWidgetIds);}
    public class DownloadBitmap extends AsyncTask<String, Void, Bitmap> {
        private RemoteViews views;  
        private String url = "http://findicons.com/files/icons/2101/ciceronian/59/photos.png";
        public DownloadBitmap(RemoteViews views) {
            this.views = views;} 
        @Override
        protected Bitmap doInBackground(String... params) {
            try {
                InputStream in = new java.net.URL(url).openStream();
                Bitmap bitmap = BitmapFactory.decodeStream(in);
                return bitmap;

            } catch (Exception e) {
                Log.e("ImageDownload", "Download failed: " + e.getMessage());}return null;
        } }}

和我的xml

<FrameLayout 

    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <LinearLayout
        android:id="@+id/widget_layout_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#aaDEDFDE"
        android:orientation="vertical"
        android:paddingLeft="5dp"
        android:paddingRight="5dp">

        <ImageView
            android:id="@+id/image_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:contentDescription="@string/image"
            android:scaleType="fitXY" />

        <TextView
            android:id="@+id/widget_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="@color/colorPrimary"
            android:gravity="center"
            android:paddingEnd="@dimen/widget_header_padding"
            android:paddingLeft="@dimen/widget_header_padding"
            android:paddingRight="@dimen/widget_header_padding"
            android:paddingStart="@dimen/widget_header_padding"
            android:text="@string/app_name"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/information"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="8dp"
            android:background="@color/primary_light"
            android:gravity="center"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/admin"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorAccent"
            android:gravity="center"
            android:minLines="3"
            android:padding="4dp"
            android:text="@string/admin_information"
            android:textColor="@android:color/black"
            android:textSize="12sp"
            android:textStyle="bold" />


    </LinearLayout>
</FrameLayout>

出什么问题了，对不起，蝙蝠英语？