1
我創建了一個應用程序小部件,它查詢數據庫中的數據,並在數據更改後使用內容觀察程序更新標籤。問題是,當創建小部件時,我將標籤更新爲正確的值。當數據發生變化時,內容觀察者正確地註冊了這一點,但我無法獲得小部件更新。代碼如下所示:Appwidgetmanager.updateAppwidget()沒有做任何事情
//called after the configuration activity is done
public static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
int appWidgetId){
m_appWidgetManager = appWidgetManager;
SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
m_account = prefs.getString("account" + appWidgetId, "unknown");
m_label = prefs.getString("label" + appWidgetId, "unknown");
m_context = context;
if (!m_accounts.contains(m_account)){
m_accounts.add(m_account);
m_context.getContentResolver().registerContentObserver(GmailContract.Labels.getLabelsUri(m_account), true,new MyContentObserver(new Handler()));
}
updateViews();
}
在ContentObserver,我只覆蓋了以下功能:
@Override
public void onChange(boolean selfChange) {
GmailUnreadCounterActivity.updateViews();
super.onChange(selfChange);
}
的更新視圖功能看起來像這樣(從updateAppWidget調用時,它完美的作品,從調用時在contentobserver,小部件不更新,儘管價值變化)
public static void updateViews(){
System.out.println("Number of widgets:" + m_appWidgetIds.length);
for (int i = 0; i < m_appWidgetIds.length; i++){
SharedPreferences prefs = m_context.getSharedPreferences(PREFS_NAME, 0);
m_account = prefs.getString("account" + m_appWidgetIds[i], "unknown");
m_label = prefs.getString("label" + m_appWidgetIds[i], "unknown");
Cursor c = m_context.getContentResolver().query(GmailContract.Labels.getLabelsUri(m_account),null,null,null,null);
while (c.moveToNext()) {
if (c.getString(c.getColumnIndex(GmailContract.Labels.CANONICAL_NAME)).equals(m_label)){
String line = String.valueOf(c.getInt(c.getColumnIndex(GmailContract.Labels.NUM_UNREAD_CONVERSATIONS)));
remoteViews = new RemoteViews(m_context.getPackageName(), R.layout.main);
remoteViews.setTextViewText(R.id.unread_count,
line);
AppWidgetManager.getInstance(m_context).updateAppWidget(m_appWidgetIds[i], remoteViews);
}
}
}
}
你好,int [] appWidgetIds參數傳遞給onUpdate的目的是什麼? – 2012-10-21 21:06:34
從android doc引用 - 「需要更新的appWidgetIds。請注意,這可能是該提供者的所有AppWidget實例,或者只是它們的一個子集」 – San 2012-10-22 23:27:50