Android ContentObserver onChange() gibt nur false zurück

Question

Ich versuche, einen ContentObserver für CallLog.Calls Content Provider zu implementieren. Ich meine, wenn ich einen Anruf tätige oder einen Anruf erhalte usw., muss der Beobachter mich darüber informieren, dass sich der Inhaltsanbieter CallLog.Calls geändert hat. Aber die Methode onchange gibt nur falsch zurück, selbst wenn die Beobachter registriert und benachrichtigt wurden. Vielleicht mache ich etwas falsch.

Dies ist mein Code. Es ist eine Aktivität.

package com.psyhclo; 


public class RatedCalls extends ListActivity { 

private static final String LOG_TAG = "RatedCallsObserver"; 
private Handler handler = new Handler(); 
private RatedCallsContentObserver callsObserver = null; 
private SQLiteDatabase db; 
private CallDataHelper dh = null; 
StringBuilder sb = new StringBuilder(); 
OpenHelper openHelper = new OpenHelper(RatedCalls.this); 

class RatedCallsContentObserver extends ContentObserver { 
    public RatedCallsContentObserver(Handler h) { 
     super(h); 
    } 

    public void onChange(boolean selfChange) { 
     Log.d(LOG_TAG, "RatedCallsContentObserver.onChange(" + selfChange 
       + ")"); 
    } 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    registerContentObservers(); 
    fillList(); 
} 

@Override 
public void onStart() { 

    super.onStart(); 
    registerContentObservers(); 

} 

@Override 
public void onStop() { 

    super.onStop(); 
    unregisterContentObservers(); 

} 

private void fillList() { 

    Cursor cursor = getContentResolver().query(
      android.provider.CallLog.Calls.CONTENT_URI, null, null, null, 
      android.provider.CallLog.Calls.DATE + " DESC "); 

    cursor.setNotificationUri(getBaseContext().getContentResolver(), 
      android.provider.CallLog.Calls.CONTENT_URI); 

    dh = new CallDataHelper(this); 
    db = openHelper.getWritableDatabase(); 

    startManagingCursor(cursor); 
    int numberColumnId = cursor 
      .getColumnIndex(android.provider.CallLog.Calls.NUMBER); 
    int durationId = cursor 
      .getColumnIndex(android.provider.CallLog.Calls.DURATION); 
    int contactNameId = cursor 
      .getColumnIndex(android.provider.CallLog.Calls.CACHED_NAME); 
    int dateId = cursor.getColumnIndex(android.provider.CallLog.Calls.DATE); 
    int numTypeId = cursor 
      .getColumnIndex(android.provider.CallLog.Calls.CACHED_NUMBER_TYPE); 
    // int contactIdColumnId = 
    // cursor.getColumnIndex(android.provider.ContactsContract.RawContacts.CONTACT_ID); 

    Date dt = new Date(); 
    int hours = dt.getHours(); 
    int minutes = dt.getMinutes(); 
    int seconds = dt.getSeconds(); 
    String currTime = hours + ":" + minutes + ":" + seconds; 

    ArrayList<String> callList = new ArrayList<String>(); 
    if (cursor.moveToFirst()) { 

     do { 

      String contactNumber = cursor.getString(numberColumnId); 
      String contactName = cursor.getString(contactNameId); 
      String duration = cursor.getString(durationId); 
      String callDate = DateFormat.getDateInstance().format(dateId); 
      String numType = cursor.getString(numTypeId); 

      ContentValues values = new ContentValues(); 

      values.put("contact_id", 1); 
      values.put("contact_name", contactName); 
      values.put("number_type", numType); 
      values.put("contact_number", contactNumber); 
      values.put("duration", duration); 
      values.put("date", callDate); 
      values.put("current_time", currTime); 
      values.put("cont", 1); 

      getBaseContext().getContentResolver().notifyChange(
        android.provider.CallLog.Calls.CONTENT_URI, null); 
      this.db.insert(CallDataHelper.TABLE_NAME, null, values); 

      Toast.makeText(getBaseContext(), "Inserted!", Toast.LENGTH_LONG); 
      callList.add("Contact Number: " + contactNumber 
        + "\nContact Name: " + contactName + "\nDuration: " 
        + duration + "\nDate: " + callDate); 

     } while (cursor.moveToNext()); 
    } 
    setListAdapter(new ArrayAdapter<String>(this, R.layout.listitem, 
      callList)); 
    ListView lv = getListView(); 
    lv.setTextFilterEnabled(true); 

    lv.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 

      Toast.makeText(getApplicationContext(), 
        ((TextView) view).getText(), Toast.LENGTH_SHORT).show(); 

     } 
    }); 

} 

private void registerContentObservers() { 
    ContentResolver cr = getContentResolver(); 
    callsObserver = new RatedCallsContentObserver(handler); 
    cr.registerContentObserver(android.provider.CallLog.Calls.CONTENT_URI, 
      true, callsObserver); 
} 

private void unregisterContentObservers() { 

    ContentResolver cr = getContentResolver(); 
    if (callsObserver != null) { // just paranoia 
     cr.unregisterContentObserver(callsObserver); 
     callsObserver = null; 
    } 

} 
} 

Answer 1

Dies ist die Antwort auf diese Frage.

Android onChange() method only returns false