我为我的应用程序使用集合创建了一个应用程序小部件，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(){
}
}