ListView widget with multiple unfinished intentions

Question

I use a list widget that has 3 types of elements. For each type of item, I have to use different pending intentions. I am currently using the following code:

public class MyWidgetProvider extends AppWidgetProvider { @Override public void onUpdate(Context context, AppWidgetManager widgetManager, int[] widgetIds) { for (int widgetId : widgetIds) { RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_view); bindEmptyView(remoteViews); bindRemoteAdapter(context, widgetId, remoteViews); bindIntentTemplate(context, widgetId, remoteViews); widgetManager.updateAppWidget(widgetId, remoteViews); } } private void bindEmptyView(RemoteViews remoteViews) { remoteViews.setEmptyView(android.R.id.list, android.R.id.empty); } private void bindRemoteAdapter(Context context, int widgetId, RemoteViews remoteViews) { Intent intent = new Intent(context, MyViewService.class); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId); intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME))); remoteViews.setRemoteAdapter(android.R.id.list, intent); } private void bindIntentTemplate(Context context, int widgetId, RemoteViews remoteViews) { Intent intent = new Intent(context, MyActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId); intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME))); PendingIntent template = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); remoteViews.setPendingIntentTemplate(android.R.id.list, template); } } 

From now on, I don’t understand how I can call a specific intent for different list items.

Answer 1

I hope I understand your problem well, so I will try to explain in detail what is happening and how to handle clicking on the list items in the widget.

I assume that you already know that you must implement a class that:

 extends BroadcastReceiver implements RemoteViewsService.RemoteViewsFactory 

This will serve as an “adapter” for your ListView widget (let's call it MyListRemoteViewFactory). If you want to handle clicks of items in a listView widget, you do the following things:

1) set setPendingIntentTemplate in your AppWidgetProvider class

2) set setOnClickFillInIntent to MyListRemoteViewFactory override getViewAt(int position)

NOW: By doing step 1), you can do something like:

 final Intent serviceIntent = new Intent(context, MyListRemoteViewFactory.class); serviceIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId); serviceIntent.setData(Uri.parse(serviceIntent.toUri(Intent.URI_INTENT_SCHEME))); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { views.setRemoteAdapter(R.id.widget_list_view, serviceIntent); } else { views.setRemoteAdapter(widgetId, R.id.widget_list_view, serviceIntent); } // Individuals items of a collection cannot set up their own pending intents. Instead, the collection as a whole sets up a pending intent template and the individual // items set a fillInIntent to create unique behavior on an item-by-item basis. Intent listItemClickIntent = new Intent(context, MyWidgetProvider.class); // This is the name of your AppWidgetProvider class // Set the action for the intent. When the user touches a particular view, it will have the effect of broadcasting an action listItemClickIntent.setAction(context.getString("com.example.list.item.click")); listItemClickIntent.setData(Uri.parse(listItemClickIntent.toUri(Intent.URI_INTENT_SCHEME))); PendingIntent clickPendingIntent = PendingIntent.getBroadcast(context, 0, listItemClickIntent, PendingIntent.FLAG_UPDATE_CURRENT); views.setPendingIntentTemplate(R.id.widget_list_view, clickPendingIntent); 

You can put the code snippet above after each initialization of the RemoteViews object:

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

So now you have the ready pendingIntentTemplate. Another thing that needs to be done is to implement the onReceive method of the class so that you can decide what to do when the action occurred for the above case. So you will do something like:

 @Override public void onReceive(Context context, Intent intent) { // Called on every broadcast and before each of the above callback methods. super.onReceive(context, intent); ComponentName name = new ComponentName(context, WidgetProvider.class); int[] appWidgetIds = AppWidgetManager.getInstance(context).getAppWidgetIds(name); if (appWidgetIds == null || appWidgetIds.length == 0) { return; } AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context); if (intent.getAction().equals("com.example.list.item.click") { // This is where you have to decide what you'll do depending on which list item was tapped. BUT this depends on the fill Intent set in the MyListRemoteViewFactory class getViewAt() method // I'll jump straight to the logic here, but once you're done reading this post, get back here to understand the logic because this is the key here. But simple as hell. int simpleDecidingFactor = intent.getIntExtra("SELECTED_ITEM", 0) if (simpleDecidingFactor != 0) { if (simpleDecidingFactor == 1) { // Do something for the first case. Probably open activity2 } else if (simpleDecidingFactor == 2) { // Do something for the second case. Probably open activity2 } else if (simpleDecidingFactor == 3) { // Do something for the second case. Probably open activity3 } } } } 

[Damn, this will be a long time]

TAKING STEP 2) (from now on we are talking about implementations in the MyListRemoteViewFactory class)

If you need 3 different elements in the list, you must first add this method to MyListRemoteViewFactory (you still have to override it, the key should return the number of views):

 @Override public int getViewTypeCount() { return 3; } 

In getViewAt() you add your own logic based on what, you decide what to display depending on your position. Sort of:

 @Override public RemoteViews getViewAt(int position) { if (position >= mItems.size()) { return null; } RemoteViews views; if (mItems.get(position).getViewType() == 0) { views = new RemoteViews(mContext.getPackageName(), R.layout.list_item_first); setUpItem(views, mItems.get(position), 1); // !!!! the 3rd parameter is very important here, as you'll expect this number in the MyWidgetProvider class' onReceive method. See the simpleDecidingFactor variable there. } else if (mItems.get(position).getViewType() == 1) { views = new RemoteViews(mContext.getPackageName(), R.layout.list_item_second); setUpItem(views, mItems.get(position), 2); } else { views = new RemoteViews(mContext.getPackageName(), R.layout.list_item_third); setUpItem(views, mItems.get(position), 3); } // Or add whatever logic you have. Here, I supposed I have a field inside my object telling me what type my item is return views; } 

And the setUpItem method might look something like this:

 private void setUpItem(RemoteViews views, MyObject object, int viewTypeKey) { // This is where you set your clickFillInIntent. Without setting it, nothing'll be functional Bundle extras = new Bundle(); extras.putInt("SELECTED_ITEM", viewTypeKey); //extras.putParcelable("LIST_ITEM_OBJECT", object); // You may send your object as well if you need it Intent fillInIntent = new Intent(); fillInIntent.putExtras(extras); // You have your fillInIntent prepared, you only have to decide on what view to place it. // I assume you have a Button on all 3 of your list item layouts with the id button_click. Let place the Intent: views.setOnClickFillInIntent(R.id.button_click, fillInIntent); } 

You might want to make sure that you also declare everything in the manifest file. You must declare your widgetprovider, your recipient for the list, and the service processing your Factoryclass. You should have something like:

 <receiver android:name=".MyWidgetProvider" android:enabled="true" android:label="My awesome widget"> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_ENABLED" /> <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /> <action android:name="android.appwidget.action.APPWIDGET_DELETED" /> <action android:name="android.appwidget.action.APPWIDGET_DISABLED" /> <!-- You have to declare your used actions here, so the AppWidgetProvider knows what to listen for--> <action android:name="com.example.list.item.click"/> </intent-filter> <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget_provider_info"/> </receiver> <!-- The service serving the RemoteViews to the collection widget --> <service android:name=".WidgetRemoteViewsService" android:exported="false" android:permission="android.permission.BIND_REMOTEVIEWS"/> <receiver android:name=".ui.widget.MyListRemoteViewFactory" android:enabled="true" android:exported="false"> <intent-filter> <category android:name="android.intent.category.DEFAULT"/> <!-- You might want to use an action to notify the appwidget provider from the MyListRemoteViewFactory onReceive method. This class extends a BroadcastReceiver, so you must implement it onReceive(Context context, Intent intent) method. If you need help on this, let me know and I'll edit my answer with some example for that too --> <action android:name="com.example.refresh.remote.views"/> </intent-filter> </receiver> 

By the way, the WidgetRemoteViewsService class should look like this:

 public class WidgetNewsRemoteViewsService extends RemoteViewsService { @Override public RemoteViewsFactory onGetViewFactory(Intent intent) { return new MyListRemoteViewFactory(); } } 

I guess this is pretty much it. I hope I haven’t missed anything.