具有不同 ListView 数据的相同小部件

Posted 2023-04-15

【中文标题】具有不同 ListView 数据的相同小部件

【英文标题】：Same widgets with different ListView data

【发布时间】：2018-12-02 05:08:00

【问题描述】：

我有一个带有 ListView 的简单 AppWidget。 该小部件具有简单的配置活动，您可以在其中选择要显示的数据集。该信息（int id）存储在 SharedPreferences 中，然后从 RemoteViewsFactory 中的 SP 获取。 一切正常，直到我在屏幕上添加另一个小部件。如果选中，新的不会加载不同的数据，而是从以前的小部件中获取一个。 几乎没有调试，我认为我的 onUpdate 方法没有被调用，但我在这里找不到问题。

WidgetConfig.java

public class IngredientsWidgetConfigureActivity extends Activity implements RecipesAdapter.RecipesAdapterOnClickHandler 


int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
RecipesAdapter mAdapter;


public IngredientsWidgetConfigureActivity()
    super();


//save recipeId into SharedPrefs
static void saveSelectedRecipe (Context context, int appWidgetId, int selectedRecipe)
    SharedPreferences.Editor prefs = context.getSharedPreferences(AppConstants.PREFS_NAME, 0).edit();
    prefs.putInt(AppConstants.PREF_PREFIX_KEY + appWidgetId, selectedRecipe);
    prefs.apply();



@Override
protected void onCreate(@Nullable Bundle icicle) 
    super.onCreate(icicle);

    setResult(RESULT_CANCELED);

    setContentView(R.layout.ingredients_widget_configure);

    //setup RecyclerView
    ...

    Intent intent = getIntent();
    Bundle extras = intent.getExtras();

    if (extras != null)
        mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
    
    if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID)
        finish();
        return;
    



@Override
public void onClick(Recipe recipe) 
    final Context context = IngredientsWidgetConfigureActivity.this;

    // When the button is clicked, store the recipe Id
    int selectedRecipe = recipe.id;
    saveSelectedRecipe(context, mAppWidgetId, selectedRecipe);

    // It is the responsibility of the configuration activity to update the app widget
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    IngredientsWidget.updateAppWidget(context, appWidgetManager, mAppWidgetId);

    // Make sure we pass back the original appWidgetId
    Intent resultValue = new Intent();
    resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
    setResult(RESULT_OK, resultValue);
    finish();

小部件提供者

....  
static void updateAppWidget(final Context context, AppWidgetManager appWidgetManager,
                     int appWidgetId) 

    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.ingredients_widget_layout);

    Intent intent = new Intent(context, WidgetRemoteViewsService.class);
    intent.putExtra(AppConstants.APP_WIDGET_ID_KEY, appWidgetId);
    views.setRemoteAdapter(R.id.widget_list_view, intent);


    //TODO: recipes are not changing in different widgets

    // Instruct the widget manager to update the widget
    appWidgetManager.updateAppWidget(appWidgetId, views);



@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);


    

最后是我的 RemoteViewsFactory.java

public WidgetRemoteViewsFactory (Context context, Intent intent)
    mContext = context;
    appWidgetId = intent.getIntExtra(AppConstants.APP_WIDGET_ID_KEY, 1);


@Override
public void onCreate() 



@Override
public void onDataSetChanged() 

    final long identityToken = Binder.clearCallingIdentity();

//get id from SharedPref
    RecipeDatabase mDb = RecipeDatabase.getInstance(mContext);
    SharedPreferences prefs = mContext.getSharedPreferences(AppConstants.PREFS_NAME, 0);
    recipeId = prefs.getInt(AppConstants.PREF_PREFIX_KEY + appWidgetId, 9999);


    recipe = mDb.recipeDAO().loadRecipe(recipeId);


    Binder.restoreCallingIdentity(identityToken);




@Override
public void onDestroy() 



@Override
public int getCount() 
    if (recipe == null) 
        return 0;
     else 
        return recipe.ingredients.size();
    


@Override
public RemoteViews getViewAt(int position) 
    if (position > recipe.ingredients.size())
        return null;
    


    RemoteViews remoteViews = new RemoteViews(mContext.getPackageName(), R.layout.widget_list_item);
    remoteViews.setTextViewText(R.id.widget_text, recipe.ingredients.get(position).getIngredient());

    return remoteViews;


@Override
public RemoteViews getLoadingView() 
    return null;


@Override
public int getViewTypeCount() 
    return 1;


@Override
public long getItemId(int position) 
    return position;


@Override
public boolean hasStableIds() 
    return true;

【参考方案1】：

解决了... 我必须将新数据放入 updateAppWidget 的 Intent 中，以便工厂加载新实例而不是重用新实例。 所以我用每个小部件发送新的随机值数据，所以它会正确更新。 updateAppWidget sn-p:

//send intent and data to Adapter
    Intent intent = new Intent(context, WidgetRemoteViewsService.class);
    intent.putExtra(AppConstants.APP_WIDGET_ID_KEY, appWidgetId);

    //set random data to initialize new Factory
    Random rnd = new Random();
    intent.setData(Uri.fromParts("content", String.valueOf(rnd.nextInt()), null));

    views.setRemoteAdapter(R.id.widget_list_view, intent);

感谢@TheFedex87