仅在Lollipop设备上，appWidget未显示在启动器小部件列表中

Question

我有一个Android的应用程序，在Android 5.0之前已经为其制作了一个小部件，但由于一些原因，在Lollipop（Android 5.0）上该小部件不会出现。然而，在Android 5.0之前的设备上，它可以正常显示。

以下是我的代码：

AndroidManifest.xml

<receiver android:name=".widgets.NewsWidgetProvider"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >>
        <intent-filter >
            <action
                android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>

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

新闻信息.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/widget_news"
android:minHeight="72dp"
android:minWidth="300dp"
android:updatePeriodMillis="6000000" >

NewsWidgetProvider.java

public class NewsWidgetProvider extends AppWidgetProvider {
private static final String NEXT_NEWS = "NEXT_NEWS";
private static final String PREVIOUS_NEWS = "PREVIOUS_NEWS";
private static final String GO_TO_NEWS_ACTIVITY = "GO_TO_NEWS_ACTIVITY";
private final String NEWS_LIST_KEY = "newsList";
NewsItem[] news;
int currentNews=0;
Bitmap imageBitmap;
private final String CURRENT_NEWS_KEY = "currentNews";

@Override
public void onUpdate(final Context context, AppWidgetManager appWidgetManager, final int[] appWidgetIds) {

    startService(context);

    loadItemFromSharedPreference(context);

    for (int widgetId : appWidgetIds) {
        setUpView(context, appWidgetManager, appWidgetIds, widgetId);
    }

}


@Override
public void onReceive(Context context, Intent intent) {
    super.onReceive(context, intent);
    loadItemFromSharedPreference(context);

    if (news != null) {
        if (GO_TO_NEWS_ACTIVITY.equals(intent.getAction())){
        openNewsActivity(context);
    }

        else if (NEXT_NEWS.equals(intent.getAction())) {
            if (currentNews == news.length - 1) {
                Toast.makeText(context, "reached last news", Toast.LENGTH_SHORT).show();
            }
        else if (news.length - 1 > currentNews) {
            currentNews++;
            SharedPreferencesManager.putInteger(context, CURRENT_NEWS_KEY, currentNews);
            loadItemFromSharedPreference(context);
            setTheCurrentView(context);
        }
        }
    else if (PREVIOUS_NEWS.equals(intent.getAction())) {
                if (currentNews == 0) {
                    Toast.makeText(context, context.getString(R.string.last_item), Toast.LENGTH_SHORT).show();
                }
                else if (currentNews > 0 && news != null) {
                    currentNews--;
                    SharedPreferencesManager.putInteger(context, CURRENT_NEWS_KEY, currentNews);
                    loadItemFromSharedPreference(context);
                    setTheCurrentView(context);
                }
            }

    }
}

private void setUpView(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds, int widgetId) {
    final RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
            R.layout.widget_news);

    remoteViews.setTextViewText(R.id.title, news==null?context.getString(R.string.wait_msg):news[currentNews].title);

    remoteViews.setTextViewText(R.id.brief,news==null?"":news[currentNews].brief);
    setPendingIntents(context, appWidgetIds, remoteViews);
    if (news!=null) {
        if (imageBitmap!=null) {
            AQuery aq = new AQuery(context);
            remoteViews.setImageViewBitmap(R.id.image, aq.getCachedImage(news[currentNews].imageUrl, 100));
        }
        else {
            remoteViews.setImageViewResource(R.id.image,R.drawable.ic_launcher);
        }
    }
    else {
        remoteViews.setImageViewResource(R.id.image,R.drawable.ic_launcher);
    }
    appWidgetManager.updateAppWidget(widgetId, remoteViews);
}


private void setTheCurrentView(Context context) {
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
            R.layout.widget_news);
    remoteViews.setTextViewText(R.id.title, news==null?context.getString(R.string.widget_problem_title):news[currentNews].title);
    remoteViews.setTextViewText(R.id.brief,news==null?context.getString(R.string.widget_problem_breif):news[currentNews].brief);
    remoteViews.setImageViewBitmap(R.id.image, imageBitmap);
    ComponentName thisWidget = new ComponentName( context, NewsWidgetProvider.class );
    AppWidgetManager.getInstance(context).updateAppWidget( thisWidget, remoteViews );
}

private void openNewsActivity(Context context) {
    Intent o=new Intent(context, NewsActivity.class);
    o.putExtra(NewsItem.EXTRA_NEWS_ITEM,news[currentNews]);
    o.putExtra(NewsItem.EXTRA_NEWS_SOURCE_IS_PUSH_OR_WIDGET,true);
    o.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(o);
}

private void setPendingIntents(Context context, int[] appWidgetIds, RemoteViews remoteViews) {
    remoteViews.setOnClickPendingIntent(R.id.next_news, getPendingSelfIntent(context, NEXT_NEWS, appWidgetIds));
    remoteViews.setOnClickPendingIntent(R.id.previous_news,getPendingSelfIntent(context,PREVIOUS_NEWS,appWidgetIds));
    remoteViews.setOnClickPendingIntent(R.id.title,getPendingSelfIntent(context,GO_TO_NEWS_ACTIVITY,appWidgetIds));
    remoteViews.setOnClickPendingIntent(R.id.brief,getPendingSelfIntent(context,GO_TO_NEWS_ACTIVITY,appWidgetIds));
    remoteViews.setOnClickPendingIntent(R.id.image,getPendingSelfIntent(context,GO_TO_NEWS_ACTIVITY,appWidgetIds));
}

protected PendingIntent getPendingSelfIntent(Context context, String action,int[] appWidgetIds) {
    Intent intent = new Intent(context, getClass());
    intent.setAction(action);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
            0, intent, 0);
    return pendingIntent;
}
private void loadItemFromSharedPreference(Context context) {

    currentNews=SharedPreferencesManager.getInteger(context, CURRENT_NEWS_KEY, 0);
    news=SharedPreferencesManager.getObject(context, NEWS_LIST_KEY,NewsItem[].class);
    AQuery aq = new AQuery(context);
    imageBitmap= news == null ? BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher) : aq.getCachedImage(news[currentNews].imageUrl,200);
}

private void startService(Context context) {
    Intent broadcastIntent = new Intent(context, NewsWidgetService.class );
    //only start service if news is null
    if (SharedPreferencesManager.getObject(context, NEWS_LIST_KEY, NewsItem[].class)==null)
        context.startService(broadcastIntent);
}

这段代码在（kitkat，jelly...）中能够运作，但在lollipop中不能运作。

我是否漏掉了什么？

- zaPlayer

---

我在使用Genymotion 4.3和Google Now Launcher时遇到了同样的bug，Google Now Launcher是Lollipop中的默认启动器，因此问题出现在启动器而不是Lollipop本身。 - Leo supports Monica Cellio

我发现 WhatsApp 和 Facebook 应用程序也有相同的问题，但奇怪的是 Evernote 却没有。 - Leo supports Monica Cellio

你正在运行棒棒糖系统的设备，并尝试在上面显示你的小部件吗？ - Libelle

@Samer Zuhair 你好，请发一下使用jQuery从URL加载图像的代码。我急需这个。 - Sangeetha

@Samer Zuhair 好的，谢谢您的回复。 - Sangeetha

Answer 1

我遇到了同样的问题 - 我通过向appwidget-provider添加附加参数android:widgetCategory="home_screen"来解决它：

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="294dp"
    android:minHeight="40dp"
    android:updatePeriodMillis="86400000"
    android:configure="com.example.activities.ConfigurationActivity"
    android:previewImage="@drawable/ic_launcher"
    android:initialLayout="@layout/widget_layout"
    android:widgetCategory="home_screen"
    android:resizeMode="none">
</appwidget-provider>

- user3774089

---

你改了别的东西吗？我的代码看起来和你的非常相似，但是在Lollipop设备上我看不到App小部件。 - astryk

仍然存在同样的问题。 - zaPlayer

Answer 2

我在从Play Store安装小部件时，甚至在开发期间直接从Android Studio安装时也遇到了这个问题。

解决方法：

• 在安装初始应用程序/应用小部件后重新启动设备对我有用。
• 安装一个自定义启动器

- SuperShalabi

Answer 3

这是Google Now Launcher上的一个错误。我发现解决此问题的方法是向您的应用程序添加虚拟ContentProvider。您可以在我的回答中看到如何执行此操作。

- Leo supports Monica Cellio