Clash Royale CLAN TAG#URR8PPP

Null Pointer When Passing Data from App to Widget via Intent

I have a list of Recipes that I retrieve using Retrofit. I then get the recipe name, and I want to update the Widget associated with my app to display the selected recipeName. The recipeName is reflected below in my adapter for my RecyclerView.

recipeName

recipeName

RecyclerView

When a user clicks on an item in the RecylcerView, I want to update the associated widget I have for the app.

RecylcerView

Below is the adapter for the RecyclerView where I have the .setOnClickListener() method and pass all of my data, via an Intent.

RecyclerView

.setOnClickListener()

Intent

@Override
public void onBindViewHolder(@NonNull MyAdapter.ViewHolder holder, final int position)
String id = mRecipeDataSet.get(position).getId();
//The recipe name I want to pass to my widget
final String recipeName = mRecipeDataSet.get(position).getName();
holder.mTextView.setText(id);
holder.itemView.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent intent = new Intent(con, BakingWidgetProvider.class);
intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
int ids = AppWidgetManager.getInstance(con).getAppWidgetIds(new ComponentName(con, BakingWidgetProvider.class));
if(ids != null && ids.length > 0)
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids);
intent.putExtra(RECIPE_NAME, recipeName);
con.sendBroadcast(intent);

Intent i = new Intent(con, IndividualRecipeActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("Recipe_List", (ArrayList<? extends Parcelable>) mRecipeDataSet);
i.putExtras(bundle);
i.putExtra("Position",position);
con.startActivity(i);

);




Below is my BakingWidgetProvider class that manages my widget. I want to update the widget interface each time a user clicks on a new item from the RecyclerView:

BakingWidgetProvider

RecyclerView

public class BakingWidgetProvider extends AppWidgetProvider

private static final String RECIPE_NAME = "RECIPE_NAME";
public static final String ACTION_TEXT_CHANGED = "kitchenpal.troychuinard.com.kitchenpal.TEXT_CHANGED";
private static String mRecipeName;

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

CharSequence widgetText = context.getString(R.string.appwidget_text);
// Construct the RemoteViews object
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.baking_widget_provider);
Log.v("WIDGET", mRecipeName);
views.setTextViewText(R.id.selected_recipe, mRecipeName);
Intent intent = new Intent(context, MainActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(context, 0,
intent, 0);
//TODO: Why isn't my widget launching my MainActivity onClick?
//TODO: I am trying to add a ListView of ingredients to my Widget
but have no idea where to begin
views.setOnClickPendingIntent(R.id.chef, pIntent);



@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 onEnabled(Context context)
// Enter relevant functionality for when the first widget is created


@Override
public void onDisabled(Context context)
// Enter relevant functionality for when the last widget is disabled


//TODO: I cannot pass data from MyAdapter to the BakingWidgerProvider. I am simply trying to display the most recently
//TODO: selected recipe on the widget. I have scoured StackOverflow to no avail
@Override
public void onReceive(Context context, Intent intent)
if (intent.getAction().equals(ACTION_TEXT_CHANGED))
// handle intent here
mRecipeName = intent.getStringExtra(RECIPE_NAME);

super.onReceive(context, intent);

// if(intent.getAction().equals("UPDATE_ACTION"))
// mRecipeName = intent.getStringExtra(RECIPE_NAME);
// int appWidgetIds =


intent.getExtras().getIntArray(AppWidgetManager.EXTRA_APPWIDGET_IDS);
// if (appWidgetIds != null && appWidgetIds.length > 0)

// this.onUpdate(context,
AppWidgetManager.getInstance(context), appWidgetIds);
//
// else
// super.onReceive(context, intent);
//
//

}


UPDATE: I have included the code to include the override for .onReceive(), and I set the field in this override method. I am trying to then use it to update my interface in .onUpdateAppWidget(), however the widget is not updating the TextView based on the mRecipeName field, as mRecipeName field is coming in null.

.onReceive()

.onUpdateAppWidget()

2 Answers
2

You should override onReceive within you AppWidgetClass. This receives the intent that was broadcasted so you may retrieve the data from it

@Override
public void onReceive(Context context, Intent intent)
super.onReceive(context, intent);
//Insert code here



And proceed to add your code to receive/assign Data from the Intent.

As soon as you trigger your widget by sending broadcast to your widget (which is BroadcastReceiver on steroids), you setting a field mRecipeName from bundle, but before setting field mRecipeName, you update RemoteView (so mRecipeName is null in this moment). Make something like that:

mRecipeName

mRecipeName

@Override
public void onReceive(Context context, Intent intent)
mRecipeName = intent.getStringExtra(RECIPE_NAME);
super.onReceive(context, intent);



Actually, to make it more cleaner for production. Make something like:

Intent intent = new Intent(con, BakingWidgetProvider.class);
intent.setAction("UPDATE_ACTION");
int ids = AppWidgetManager.getInstance(con).getAppWidgetIds(new ComponentName(con, BakingWidgetProvider.class));
if(ids != null && ids.length > 0)
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids);
intent.putExtra(RECIPE_NAME, recipeName);
con.sendBroadcast(intent);



And your onReceive will be like:

@Override
public void onReceive(Context context, Intent intent)
if(intent.getAction().equals("UPDATE_ACTION")
mRecipeName = intent.getStringExtra(RECIPE_NAME);
int appWidgetIds = extras.getIntArray(AppWidgetManager.EXTRA_APPWIDGET_IDS);
if (appWidgetIds != null && appWidgetIds.length > 0)
this.onUpdate(context, AppWidgetManager.getInstance(context), appWidgetIds);

else
super.onReceive(context, intent);




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