我实现了一个 ContentObserver，它运行良好。但是现在每次 ContentObserver 被通知 CallLog.Calls 内容提供程序中的某些更改时，它都会运行 onChange() 方法而不会停止。
我希望我的观察者为内容提供程序中更改的每个项目运行一次。因此，如果向 CallLog.Calls 内容提供程序添加了 5 个新项目，则必须通知观察者 5 次，并且对于观察者的每次通知，都必须发生对 onChange() 方法的新调用。
这是我的代码。
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 Cursor cursor;
StringBuilder sb = new StringBuilder();
OpenHelper openHelper = new OpenHelper(RatedCalls.this);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getApplicationContext()
.getContentResolver()
.registerContentObserver(
android.provider.CallLog.Calls.CONTENT_URI, true,
new RatedCallsContentObserver(handler));
Log.d("FILLLIST", "calling from onCreate()");
}
class RatedCallsContentObserver extends ContentObserver {
public RatedCallsContentObserver(Handler h) {
super(h);
}
@Override
public boolean deliverSelfNotifications() {
return true;
}
@Override
public void onChange(boolean selfChange) {
Log.d(LOG_TAG, "RatedCallsContentObserver.onChange( " + selfChange
+ ")");
super.onChange(selfChange);
fillList();
}
}
private void fillList() {
cursor = getContentResolver().query(
android.provider.CallLog.Calls.CONTENT_URI, null, null, null,
android.provider.CallLog.Calls.DATE + " DESC ");
Log.d("FILLLIST", "Calling from filllist");
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);
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>();
cursor.moveToFirst();
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,
new RatedCallsContentObserver(handler));
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);
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();
}
});
}
}