使用集合更新应用小部件的问题
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【中文标题】使用集合更新应用小部件的问题【英文标题】：Update issue of an app widget using collection 【发布时间】：2013-03-27 14:54:32 【问题描述】：我为我的应用创建了一个使用集合的应用小部件，该小部件显示该特定日期的日期和项目列表。一切正常，并且小部件正在根据需要进行更新，但有时通过单击下一个和上一个按钮更改小部件中的日期时会发生什么情况，列表未刷新意味着项目未在该特定日期更新。这种行为是随机的，它有时只发生。那么为什么会发生这种情况，我的代码有什么问题。
我使用过的代码：
WidgetProvider.class
public class WidgetProvider extends AppWidgetProvider
private ThemeManager m_ThemeManagerObject;
private static String WIDGET_NEXT_BUTTON = "in.test.widgetApp.WIDGET_NEXT_BUTTON";
private static String WIDGET_PREV_BUTTON = "in.test.widgetApp.WIDGET_PREV_BUTTON";
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
super.onUpdate(context, appWidgetManager, appWidgetIds);
// Set Date to current Date
NoteManager.getSingletonObject().setWidgetToCurrentDate();
// Code to update the widget by current date
updateAppWidget(context, AppWidgetManager.getInstance(context), appWidgetIds);
@Override
public void onReceive(Context context, Intent intent)
super.onReceive(context, intent);
int numOfDays = 1;
ComponentName thisWidget = new ComponentName(context, WidgetProvider.class);
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
if (intent.getAction().equals(WIDGET_NEXT_BUTTON))
// Increase no of days by one
// Update the widget by new date
NoteManager.getSingletonObject().setWidgetDate(numOfDays);
updateAppWidget(context, AppWidgetManager.getInstance(context), appWidgetIds);
else if (intent.getAction().equals(WIDGET_PREV_BUTTON))
// Decrease no of days by one
// Update the widget by new date
NoteManager.getSingletonObject().setWidgetDate(-numOfDays);
updateAppWidget(context, AppWidgetManager.getInstance(context), appWidgetIds);
public void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
// Get the folder path of all-page-view
ContextWrapper cw = new ContextWrapper(context.getApplicationContext());
File customDirectoryPath = cw.getDir(Utilities.CUSTOM_DIRECTORY_NAME_PREFIX, Context.MODE_PRIVATE);
File allPageDirectoryPath = new File(customDirectoryPath.getPath() + "/" + Utilities.All_PAGE_DIRECTORY_NAME_PREFIX);
if (!(allPageDirectoryPath.exists()))
allPageDirectoryPath.mkdirs();
// Create an singleton object of ThemeManager class
m_ThemeManagerObject = ThemeManager.getSingletonObject();
m_ThemeManagerObject.readTheme(allPageDirectoryPath.getPath());
// Create an instance of SimpleDateFormat class
SimpleDateFormat dateFormater = new SimpleDateFormat("dd-MMM, EEE", Locale.US);
/* loop through all widget instances */
for (int widgetId : appWidgetIds)
// Create an instance of remote view class
RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.widget_list);
Intent svcIntent = new Intent(context, WidgetService.class);
svcIntent.setData(Uri.fromParts("content", String.valueOf(widgetId), null));
remoteView.setRemoteAdapter(R.id.widget_list, svcIntent);
// Show day, month and week day inside the widget
remoteView.setTextViewText(R.id.txt_date, dateFormater.format(NoteManager.getSingletonObject().getWidgetDate().getTime()));
// If the list is empty. Show empty widget with juswrite-icon & empty text to the user
remoteView.setEmptyView(R.id.widget_list, R.id.widget_empty_text);
// On click of next button
Intent nextButtonIntent = new Intent(WIDGET_NEXT_BUTTON);
/* use widgetId as second parameter - it helped me to better address particular widget instance */
PendingIntent nextButtonPendingIntent = PendingIntent.getBroadcast(context, widgetId, nextButtonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.btn_next_month, nextButtonPendingIntent);
remoteView.setInt(R.id.btn_next_month, "setBackgroundResource", m_ThemeManagerObject.getNextButtonBgImage());
// On click of previous button
Intent prevButtonIntent = new Intent(WIDGET_PREV_BUTTON);
/* use widgetId as second parameter - same as above */
PendingIntent prevButtonPendingIntent = PendingIntent.getBroadcast(context, widgetId, prevButtonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.btn_prev_month, prevButtonPendingIntent);
remoteView.setInt(R.id.btn_prev_month, "setBackgroundResource", m_ThemeManagerObject.getPrevButtonBgImage());
// Open application on click of app widget
Intent clickIntent = new Intent(context, AllPageViewActivity.class);
PendingIntent clickPI = PendingIntent.getActivity(context, 0,clickIntent,PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.widget_empty_text, clickPI);
remoteView.setOnClickPendingIntent(R.id.txt_date, clickPI);
/* update one widget instance at a time*/
appWidgetManager.updateAppWidget(widgetId, remoteView);
WidgetService.class
public class WidgetService extends RemoteViewsService
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent)
return(new WidgetDisplay(this.getApplicationContext(), intent));
WidgetDisplay.class
public class WidgetDisplay implements RemoteViewsService.RemoteViewsFactory
private File m_CustomDirectoryPath, m_AllPageDirectoryPath;
private NoteManager m_NoteManagerObject;
private ThemeManager m_ThemeManagerObject;
private ArrayList<String> m_AlarmItemNameArrayList;
private ArrayList<Integer> m_ItemIndexArray;
private Context ctxt=null;
int appWidgetId;
Bitmap canvasBackground;
public WidgetDisplay(Context ctxt, Intent intent)
this.ctxt=ctxt;
appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
setImageInView(this.ctxt);
private void setImageInView(Context context)
ContextWrapper cw = new ContextWrapper(ctxt.getApplicationContext());
m_CustomDirectoryPath = cw.getDir(Utilities.CUSTOM_DIRECTORY_NAME_PREFIX, Context.MODE_PRIVATE);
m_AllPageDirectoryPath = new File(m_CustomDirectoryPath.getPath() + "/" + Utilities.All_PAGE_DIRECTORY_NAME_PREFIX);
m_NoteManagerObject = NoteManager.getSingletonObject();
m_ThemeManagerObject = ThemeManager.getSingletonObject();
m_NoteManagerObject.readSettings(m_AllPageDirectoryPath.getPath());
m_NoteManagerObject.readAllPageChangesFromFile(m_AllPageDirectoryPath.getPath());
m_NoteManagerObject.readAlarmFromFile(m_AllPageDirectoryPath.getPath());
m_ThemeManagerObject.readTheme(m_AllPageDirectoryPath.getPath());
m_AlarmItemNameArrayList = new ArrayList<String>(m_NoteManagerObject.getAlarmCount());
m_ItemIndexArray = new ArrayList<Integer>(m_NoteManagerObject.getAlarmCount());
SimpleDateFormat sdFormatter = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
String selectedDate = sdFormatter.format(m_NoteManagerObject.getWidgetDate());
for(int i=0; i<m_NoteManagerObject.getAlarmCount(); i++)
String ArrayDate = sdFormatter.format(m_NoteManagerObject.getAlarmTime(i));
if(selectedDate.equals(ArrayDate))
File noteDirectoryPath = new File(m_CustomDirectoryPath.getPath() + "/" + m_NoteManagerObject.getAlarmFolder(i));
m_AlarmItemNameArrayList.add(noteDirectoryPath.getPath() + "/" + m_NoteManagerObject.getAlarmItem(i));
m_ItemIndexArray.add(i);
@Override
public int getCount()
return(m_AlarmItemNameArrayList.size());
@Override
public RemoteViews getViewAt(int position)
new ImageLoaderTask(position).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
// Set combine image to the image view using remote view instance
RemoteViews remoteView = new RemoteViews(ctxt.getPackageName(), R.layout.widget_list_item);
remoteView.setImageViewBitmap(R.id.image_view, canvasBackground);
// Set time text view using remote view instance
SimpleDateFormat timeFormater;
if(m_NoteManagerObject.get24HourFormat())
timeFormater = new SimpleDateFormat("HH:mm", Locale.US);
else
timeFormater = new SimpleDateFormat("hh:mm a", Locale.US );
// Show time on the top of each image view
String time = timeFormater.format(m_NoteManagerObject.getAlarmTime(m_ItemIndexArray.get(position)));
remoteView.setTextViewText(R.id.text_alarm_time, time);
Intent clickIntent = new Intent(ctxt, AllPageViewActivity.class);
PendingIntent clickPI=PendingIntent.getActivity(ctxt, 0,clickIntent,PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.image_view, clickPI);
return(remoteView);
class ImageLoaderTask extends AsyncTask<URL, Integer, Long>
private int position;
ImageLoaderTask(int position)
this.position = position;
@Override
protected void onPreExecute()
// Get foreground and background image
Bitmap bitmapImage = BitmapFactory.decodeFile(m_AlarmItemNameArrayList.get(position)).copy(Bitmap.Config.ARGB_8888, true);
canvasBackground = BitmapFactory.decodeResource(ctxt.getResources(), m_ThemeManagerObject.getWidgetListItemBgImage(m_ItemIndexArray.get(position), bitmapImage)).copy(Bitmap.Config.ARGB_8888, true);
// Scaled foreground image and combine with the background image
bitmapImage = Bitmap.createScaledBitmap(bitmapImage, 380, bitmapImage.getHeight() / 2, true);
Canvas comboImage = new Canvas(canvasBackground);
comboImage.drawBitmap(bitmapImage, 0f, 0f, null);
@Override
protected Long doInBackground(URL... urls)
return null;
@Override
protected void onProgressUpdate(Integer... progress)
@Override
protected void onPostExecute(Long result)
@Override
public void onCreate()
@Override
public void onDestroy()
@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()
【问题讨论】：
任何人都知道这个答案的线索 经过大量搜索，我终于得到了答案。实际上我必须调用 appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.widget_list); onReceive() 方法。我已经发布了我更新的代码作为这个问题的答案以供将来使用。 【参考方案1】：WidgetProvider.class
public class WidgetProvider extends AppWidgetProvider
private NoteManager m_NoteManagerObject;
private ThemeManager m_ThemeManagerObject;
private SimpleDateFormat m_DateFormater;
private static String WIDGET_NEXT_BUTTON = "in.test.widgetApp.WIDGET_NEXT_BUTTON";
private static String WIDGET_PREV_BUTTON = "in.test.widgetApp.WIDGET_PREV_BUTTON";
public WidgetProvider()
// Create an singleton object of NoteManager class
m_NoteManagerObject = NoteManager.getSingletonObject();
// Create an singleton object of ThemeManager class
m_ThemeManagerObject = ThemeManager.getSingletonObject();
// Create an instance of SimpleDateFormat class
m_DateFormater = new SimpleDateFormat("dd-MMM, EEE", Locale.US);
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
super.onUpdate(context, appWidgetManager, appWidgetIds);
// Set Date to current Date
m_NoteManagerObject.setWidgetToCurrentDate();
// Get the folder path of all-page-view
ContextWrapper cw = new ContextWrapper(context.getApplicationContext());
File customDirectoryPath = cw.getDir(Utilities.CUSTOM_DIRECTORY_NAME_PREFIX, Context.MODE_PRIVATE);
File allPageDirectoryPath = new File(customDirectoryPath.getPath() + "/" + Utilities.All_PAGE_DIRECTORY_NAME_PREFIX);
if (!(allPageDirectoryPath.exists()))
allPageDirectoryPath.mkdirs();
m_ThemeManagerObject.readTheme(allPageDirectoryPath.getPath());
// Set up the intent that starts the WidgetService, which will
// provide the views for this collection.
// When intents are compared, the extras are ignored, so we need to embed the extras
// into the data so that the extras will not be ignored.
Intent intent = new Intent(context, WidgetService.class);
intent.setData(Uri.fromParts("content", String.valueOf(appWidgetIds), null));
// Instantiate the RemoteViews object for the App Widget layout.
// Set up the RemoteViews object to use a RemoteViews adapter.
// This adapter connects to a RemoteViewsService through the specified intent.
// This is how you populate the data.
RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.widget_list);
remoteView.setRemoteAdapter(R.id.widget_list, intent);
// Show day, month and week day inside the widget
remoteView.setTextViewText(R.id.txt_date, m_DateFormater.format(m_NoteManagerObject.getWidgetDate().getTime()));
// The empty view is displayed when the collection has no items.
remoteView.setEmptyView(R.id.widget_list, R.id.widget_empty_text);
// On click of next button
// This section makes it possible for items to have individualized behavior.
// Set the action for the intent.
// When the user touches a particular view, it will have the effect of
// broadcasting ACTION.
Intent nextButtonIntent = new Intent(context, WidgetProvider.class);
nextButtonIntent.setAction(WIDGET_NEXT_BUTTON);
PendingIntent nextButtonPendingIntent = PendingIntent.getBroadcast(context, 0, nextButtonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.btn_next_month, nextButtonPendingIntent);
remoteView.setInt(R.id.btn_next_month, "setBackgroundResource", m_ThemeManagerObject.getNextButtonBgImage());
// On click of previous button
// This section makes it possible for items to have individualized behavior.
// Set the action for the intent.
// When the user touches a particular view, it will have the effect of
// broadcasting ACTION.
Intent prevButtonIntent = new Intent(context, WidgetProvider.class);
prevButtonIntent.setAction(WIDGET_PREV_BUTTON);
PendingIntent prevButtonPendingIntent = PendingIntent.getBroadcast(context, 0, prevButtonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.btn_prev_month, prevButtonPendingIntent);
remoteView.setInt(R.id.btn_prev_month, "setBackgroundResource", m_ThemeManagerObject.getPrevButtonBgImage());
// Open application on click of app widget
Intent clickIntent = new Intent(context, AllPageViewActivity.class);
PendingIntent clickPI = PendingIntent.getActivity(context, 0,clickIntent,PendingIntent.FLAG_UPDATE_CURRENT);
remoteView.setOnClickPendingIntent(R.id.widget_empty_text, clickPI);
remoteView.setOnClickPendingIntent(R.id.txt_date, clickPI);
appWidgetManager.updateAppWidget(appWidgetIds, remoteView);
@Override
public void onReceive(Context context, Intent intent)
super.onReceive(context, intent);
int numOfDays = 1;
ComponentName thisWidget = new ComponentName(context, WidgetProvider.class);
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
if (intent.getAction().equals(WIDGET_NEXT_BUTTON))
// Increase no of days by one
m_NoteManagerObject.setWidgetDate(numOfDays);
// Update remote view
RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.widget_list);
remoteView.setTextViewText(R.id.txt_date, m_DateFormater.format(m_NoteManagerObject.getWidgetDate().getTime()));
appWidgetManager.updateAppWidget(appWidgetIds, remoteView);
// Update list content of the widget
// This will call onDataSetChanged() method of WidgetDisplay class
appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.widget_list);
else if (intent.getAction().equals(WIDGET_PREV_BUTTON))
// Decrease no of days by one
m_NoteManagerObject.setWidgetDate(-numOfDays);
// Update remote view
RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.widget_list);
remoteView.setTextViewText(R.id.txt_date, m_DateFormater.format(m_NoteManagerObject.getWidgetDate().getTime()));
appWidgetManager.updateAppWidget(appWidgetIds, remoteView);
// Update list content of the widget
// This will call onDataSetChanged() method of WidgetDisplay class
appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.widget_list);
【讨论】：
对您自己的问题的出色回答，赞！你为我节省了大量研究时间；）【参考方案2】：您可以尝试在您的 nextButtonPendingIntent 和 prevButtonPendingIntent 待定意图中将 PendingIntent.FLAG_UPDATE_CURRENT 更改为 PendingIntent.FLAG_CANCEL_CURRENT 会有所帮助。
【讨论】：
它已经在 nextButtonPendingIntent 和 prevButtonPendingIntent 中设置为 PendingIntent.FLAG_UPDATE_CURRENT。 我在原始答案中犯了错误（我在粘贴时切换了标志的顺序）。立即编辑。 不工作有时它会更新列表，但有时它不会，但日期会发生变化，这意味着点击按钮，从 onReceive() 方法转到 updateAppWidget()，但从那里它无法调用 WidgetService 类。结果它将无法调用 WidgetDisplay 类并且数据没有更新，但有时它就像一个魅力。 所以在为下一个和上一个按钮设置 pendingIntents 之前它会中断。我觉得可疑的一件事是： svcIntent.setData(Uri.fromParts("content", String.valueOf(appWidgetIds), null));执行 String.valueOf(int[]) 会产生类似“[I@142bece”的东西，也许你应该更新你的updateAppWidget 方法来迭代 appWidgetIds 并为每个 single 执行它的逻辑 小部件实例（设置 pendingIntents 等）。顺便说一句，我发现在 PendingIntent.getBroadcast(...) 调用中使用当前的 widgetId 作为第二个参数而不是 0 是个好主意。
你能告诉我一些代码行吗，实际上我无法得到我需要在我的代码中更改的内容。【参考方案3】：
当您在updateAppWidget 中创建PendingIntents 时，为每个小部件创建以下两个：
PendingIntent nextButtonPendingIntent = PendingIntent.getBroadcast(context, widgetId, nextButtonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
PendingIntent prevButtonPendingIntent = PendingIntent.getBroadcast(context, widgetId, prevButtonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
对于两者，您将第二个参数设置为 widgetId。 PendingIntent 系统不会查看 Intent 参数是否不同。 （事实上，它绝对不应该这样做——否则你无法将现有的 PendingIntent 更新为新的 Intent。）这意味着 nextButtonPendingIntent 和 prevButtonPendingIntent 最终结果相同。
解决方案是将已知的、不同的数字放入该参数中，并将其他有用的信息（如小部件 ID）放入意图中：
nextButtonIntent.putExtra("widget_id", widgetId);
并在onReceive():中检索它
int widgetId = intent.getIntExtra("widget_id");
【讨论】：
如果您有时间查看我的问题，我也会遇到类似的问题：我有点茫然***.com/questions/25944639/… 我已经回答过了，希望对你有帮助。以上是关于使用集合更新应用小部件的问题的主要内容，如果未能解决你的问题，请参考以下文章