Android主屏幕小部件未更新

Posted 2023-04-15

【中文标题】Android主屏幕小部件未更新

【英文标题】：Android home screen widget not updating

【发布时间】：2017-02-19 07:49:45

【问题描述】：

我创建了一个简单的主屏幕小部件，用于显示从数据库生成的名称。我在TextView中添加了一个刷新名称的按钮，但问题是小部件没有更新。

这是我的 Widget 类：

public class QuotesWidgets extends AppWidgetProvider 
    ComponentName watchWidget;
    RemoteViews remoteViews;
    private static final String SYNC_CLICKED = "automaticWidgetSyncButtonClick";
    void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                         int appWidgetId) 

        Realm mRealm;

        mRealm=Realm.getDefaultInstance();
        Random random = new Random();
        RealmResults<names> randomName = mRealm.where(Names.class).findAll();
        Names name = randomName.get(random.nextInt(randomName.size()));
        String name1 = quote.getName();
        remoteViews = new RemoteViews(context.getPackageName(), R.layout.my_widget);
        watchWidget = new ComponentName(context, MyWidget.class);
        remoteViews.setTextViewText(R.id.textview, name);

        remoteViews.setOnClickPendingIntent(R.id.refresh, getPendingSelfIntent(context, SYNC_CLICKED));
        appWidgetManager.updateAppWidget(watchWidget, remoteViews);
    

    @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);
        
    

    @Override
    public void onReceive(Context context, Intent intent) 
        super.onReceive(context, intent);
        if (SYNC_CLICKED.equals(intent.getAction())) 
            Realm mRealm;
            mRealm=Realm.getDefaultInstance();

            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
            remoteViews = new RemoteViews(context.getPackageName(), R.layout.quotes_widgets);
            watchWidget = new ComponentName(context, MyWidgets.class);
            appWidgetManager.updateAppWidget(watchWidget, remoteViews);
            Random random = new Random();
            RealmResults<names> randomName = mRealm.where(Names.class).findAll();
            Names name = randomName.get(random.nextInt(randomName.size()));
            String name1 = quote.getName();

            Toast.makeText(context,name1, Toast.LENGTH_SHORT).show();
            remoteViews.setTextViewText(R.id.textview, name1);


        
    
    protected PendingIntent getPendingSelfIntent(Context context, String action) 
        Intent intent = new Intent(context, getClass());
        intent.setAction(action);
        return PendingIntent.getBroadcast(context, 0, intent, 0);
    

我在示例中使用了 Toast 消息，当我单击按钮时，Toast 消息每次都会以不同的名称出现，因此除了小部件中 TextView 的更改外，一切都运行良好。有什么问题？

【参考方案1】：

先设置新文本：

 remoteViews.setTextViewText(R.id.textview, name1);

然后让AppWidgetManager 更新小部件：

appWidgetManager.updateAppWidget(watchWidget, remoteViews);