我在App Widget中使用ListView来显示RSS提要中的一些项目。如果我点击ListView中的项目，我想转到我的应用程序的活动。
我现在可以用点击的位置显示Toast。我想去。但我不知道如何开始活动。
我需要将我的RSSFeed和位置放在开始活动的意图内。
我有一个WidgetProvider.java，它在onUpdate（）方法中调用RemoteFetchService.java。在本服务的OnStartCommand（）中，我启动AsyncTask并解析我的RSS提要。在OnPostExecute（）中，我向WidgetProvider.java广播，我成功获取了数据。然后在WidgetProvider.java中，我通过实现RemoteViewsFactory的ListProvider.java类设置了一个远程适配器。那么我在哪里以及如何开始我的活动？
WidgetProvider.java
public class WidgetProvider extends AppWidgetProvider {
// String to be sent on Broadcast as soon as Data is Fetched
// should be included on WidgetProvider manifest intent action
// to be recognized by this WidgetProvider to receive broadcast
public static final String DATA_FETCHED = "mypackage.RSS.DATA_FETCHED";
public static final String EXTRA_LIST_VIEW_ROW_NUMBER = "mypackage.EXTRA_LIST_VIEW_ROW_NUMBER";
/*
* this method is called every 30 mins as specified on widgetinfo.xml this
* method is also called on every phone reboot from this method nothing is
* updated right now but instead RetmoteFetchService class is called this
* service will fetch data,and send broadcast to WidgetProvider this
* broadcast will be received by WidgetProvider onReceive which in turn
* updates the widget
*/
@Override
public void onUpdate(Context ctxt, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Log.d("Widget", "Hello WidgetProvider onUpdate");
/*
* int[] appWidgetIds holds ids of multiple instance of your widget
* meaning you are placing more than one widgets on your homescreen
*/
for (int i = 0; i < appWidgetIds.length; ++i) {
Intent serviceIntent = new Intent(ctxt, RemoteFetchService.class);
serviceIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
appWidgetIds[i]);
ctxt.startService(serviceIntent);
}
super.onUpdate(ctxt, appWidgetManager, appWidgetIds);
}
/*
* It receives the broadcast as per the action set on intent filters on
* Manifest.xml once data is fetched from RemoteFetchService,it sends
* broadcast and WidgetProvider notifies to change the data the data change
* right now happens on ListProvider as it takes RemoteFetchService
* listItemList as data
*/
@SuppressWarnings("deprecation")
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
Log.d("Widget", "Hello WidgetProvider onReceive");
//if RSS Feed was parsed in RemoteFetchService.java
if (intent.getAction().equals(DATA_FETCHED)) {
Log.d("Widget", "Data fetched in Widget Provider");
int appWidgetId = intent.getIntExtra(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
AppWidgetManager appWidgetManager = AppWidgetManager
.getInstance(context);
// which layout to show on widget
RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
R.layout.widget_layout);
// RemoteViews Service needed to provide adapter for ListView
Intent svcIntent = new Intent(context, WidgetService.class);
// passing app widget id to that RemoteViews Service
svcIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
appWidgetId);
// setting a unique Uri to the intent
svcIntent.setData(Uri.parse(svcIntent
.toUri(Intent.URI_INTENT_SCHEME)));
// setting adapter to listview of the widget
remoteViews.setRemoteAdapter(appWidgetId, R.id.listViewWidget,
svcIntent);
// setting an empty view in case of no data
remoteViews.setEmptyView(R.id.listViewWidget, R.id.empty_view);
// onclick item listview
// This section makes it possible for items to have individualized
// behavior.
// It does this by setting up a pending intent template. 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 toastIntent = new Intent(context, WidgetProvider.class);
// Set the action for the intent.
// When the user touches a particular view, it will have the effect
// of
// broadcasting TOAST_ACTION.
toastIntent.setAction(WidgetProvider.EXTRA_LIST_VIEW_ROW_NUMBER);
toastIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
appWidgetId);
intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
PendingIntent toastPendingIntent = PendingIntent.getBroadcast(
context, 0, toastIntent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setPendingIntentTemplate(R.id.listViewWidget,
toastPendingIntent);
appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
}
//if item on list was clicked
if (intent.getAction().equals(EXTRA_LIST_VIEW_ROW_NUMBER)) {
int appWidgetId = intent.getIntExtra(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
AppWidgetManager appWidgetManager = AppWidgetManager
.getInstance(context);
//get position on listview which was clicked
int viewIndex = intent.getIntExtra(EXTRA_LIST_VIEW_ROW_NUMBER, 0);
//get RSSFeed
RSSFeed feed = ListItem.Feed;
Toast.makeText(context, "Clicked on position :" + viewIndex,
Toast.LENGTH_SHORT).show();
} else {
Log.d("Widget", "No Data fetched in Widget Provider");
}
}
}
RemoteFetchService.java
public class RemoteFetchService extends Service {
private int appWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
RSSFeed feed;
public Date pDate;
public static ArrayList<ListItem> listItemList;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
/*
* Retrieve appwidget id from intent it is needed to update widget later
* start Async Task
*/
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("Widget", "Hello RemoteFetchService onStartCommand");
if (intent.hasExtra(AppWidgetManager.EXTRA_APPWIDGET_ID))
appWidgetId = intent.getIntExtra(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
//fetchDataFromWeb();
new AsyncLoadXMLFeed().execute();
return super.onStartCommand(intent, flags, startId);
}
/**
* AsyncTask which parses the xml and post it
**/
public class AsyncLoadXMLFeed extends AsyncTask<Void, Void, RSSFeed> {
protected RSSFeed doInBackground(Void... params) {
try {
Log.d("Widget", "Starte Parsing von URL in Widget");
// Obtain feed
DOMParser myParser = new DOMParser();
feed = myParser.parseXml("http://www.test.de/feed");
Log.d("Widget","ItemCount Parser in Widget: "+feed.getItemCount());
return feed;
} catch (Exception e) {
Log.d("Widget","Exception beim Parsen: "+e.toString());
return null;
}
}
@Override
protected void onPostExecute(RSSFeed parsed_feed) {
// super.onPostExecute(result);
Log.d("Widget", "Async Parse fertig");
listItemList = new ArrayList<ListItem>();
if(feed!=null){
try {
int length = feed.getItemCount();
for (int i = 0; i < length; i++) {
String date = calc_date_difference(feed, i);
ListItem listItem = new ListItem();
listItem.Feed = feed;
listItem.heading = feed.getItem(i).getTitle();
listItem.pubDate = date;
listItem.linkUrl = feed.getItem(i).getLink();
Log.d("Widget Heading", feed.getItem(i).getTitle());
Log.d("Widget PubDate", date);
Log.d("Widget linkUrl", feed.getItem(i).getLink());
listItemList.add(listItem);
}
} catch (Exception e) {
Log.d("Widget","Exception onPostExecute: "+e.toString());
}
}else{
Log.d("Widget", "Feed in onPostExecute ist null");
}
//start intent and broadcast WidgetProvider, that data is fetched
Intent widgetUpdateIntent = new Intent();
widgetUpdateIntent.setAction(WidgetProvider.DATA_FETCHED);
widgetUpdateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
appWidgetId);
sendBroadcast(widgetUpdateIntent);
//stop service
stopSelf();
}
}
/**
* Method to calculate the time difference
**/
public String calc_date_difference (RSSFeed feed, int pos){
// calculate the time difference to the actual system time
String pubDate = feed.getItem(pos).getDate();
SimpleDateFormat df = new SimpleDateFormat(
"EEE, dd MMM yyyy HH:mm:ss",Locale.ENGLISH);
try {
try {
pDate = df.parse(pubDate);
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
pubDate = "Vor "
+ DateUtils.getDateDifference(pDate);
return pubDate;
} catch (ParseException e) {
Log.e("DATE PARSING", "Error parsing date..");
return null;
}
}
}
WidgetService.java
/**
*
* Just consider this class as the class which tells the ListView of appwidget
* to take what type of data. By data meaning what ListViewsFactory. To make it
* more simple,if you have done ListView population,this class defines the
* Adapter for the ListView. Let us name ListViewsService as WidgetService.java
*
**/
public class WidgetService extends RemoteViewsService {
/*
* So pretty simple just defining the Adapter of the listview here Adapter
* is ListViewsFactory
*/
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
int appWidgetId = intent.getIntExtra(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
return (new ListProvider(this.getApplicationContext(), intent));
}
}
ListItem.java
public class ListItem {
public String heading,pubDate,linkUrl;
public static RSSFeed Feed;
}
ListProvider.java
/**
* If you are familiar with Adapter of ListView,this is the same as adapter with
* few changes
*
*/
public class ListProvider implements RemoteViewsFactory {
private RemoteViews views;
private Context ctxt = null;
private int appWidgetId;
private ArrayList<ListItem> listItemList = new ArrayList<ListItem>();
public ListProvider(Context ctxt, Intent intent) {
this.ctxt = ctxt;
appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
if (RemoteFetchService.listItemList != null)
listItemList = (ArrayList<ListItem>) RemoteFetchService.listItemList
.clone();
else
listItemList = new ArrayList<ListItem>();
}
@Override
public void onCreate() {
// no-op
Log.d("Widget", "Hello ListProvider onCreate");
}
@Override
public void onDestroy() {
// no-op
}
@Override
public int getCount() {
return listItemList.size();
}
/*
* Similar to getView of Adapter where instead of Viewwe return RemoteViews
*/
@Override
public RemoteViews getViewAt(int position) {
final RemoteViews remoteView = new RemoteViews(ctxt.getPackageName(),
R.layout.row);
ListItem listItem = listItemList.get(position);
remoteView.setTextViewText(R.id.heading, listItem.heading);
remoteView.setTextViewText(R.id.pubDate, listItem.pubDate);
//onclick item listview
Intent fillInIntent = new Intent();
fillInIntent.putExtra(WidgetProvider.EXTRA_LIST_VIEW_ROW_NUMBER, position);
remoteView.setOnClickFillInIntent(R.id.heading, fillInIntent);
return remoteView;
}
@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);
}
@Override
public void onDataSetChanged() {
// no-op
}
}
答案 0 :(得分：1)
如果你能正确获得饲料和位置
Toast.makeText(context, "Clicked on position :" + viewIndex, Toast.LENGTH_SHORT).show();
你应该可以添加像
这样的行context.startActivity(INTENT HERE);
您可能希望将RSS Feed作为字符串传递，或者实现Parcelable。
答案 1 :(得分：0)
您要做的是为每个列表视图项设置PendingIntent。因此，当用户单击该项目时，将广播其待处理的意图，并根据您填写待处理意图的额外数据启动活动。 你甚至不需要用来显示吐司的广播接收器。只需使用待定意图启动活动即可。 要了解如何将待处理的意图模板设置为远程列表视图并为每个列表视图项填充它，请参阅＆＃34;向各个项添加行为＆＃34;在以下android doc中：
https://developer.android.com/guide/topics/appwidgets/index.html