Android - ошибка в получении списка всех контактов

Question

Я пытаюсь получить все контактные номера с моего устройства. И я написал для этого сегмент кода. Но мне приходится сталкиваться с ошибкой в ​​получении списка номеров контактов. Я отправляю свой код, а также журнал ошибок здесь.
Спасибо.

код в OnCreate из MainActivity

 contactListText = (TextView) findViewById(R.id.ContactsListText); 
     ContactsProvider c = new ContactsProvider(this); 
     c.setContactsString(); 
     String contactList = c.getContactString(); 
     contactListText.setText(contactList); 

ContactsProvider.java

public class ContactsProvider { 

    ArrayList<String> contactList; 
    Context context; 
    String name; 

    public ContactsProvider(Context context) { 
     this.context = context; 
    } 

    public ArrayList<String> getContactList() { 
     return contactList; 
    } 

    public void setContactsString() { 

     contactList = new ArrayList<String>(); 

     Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI; 
     String[] projection = new String[] {ContactsContract.CommonDataKinds.Phone.NUMBER}; 
     Cursor people = context.getContentResolver().query(uri, projection, null, null, null); 

     int indexNumber = people.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER); 

     people.moveToFirst(); 
     do { 
      String number = people.getString(indexNumber); 
      contactList.add(number); 

     } while (people.moveToNext()); 
    } 

    public String getContactString() { 

     if (contactList.size() > 0) { 
      StringBuilder contactString = new StringBuilder(); 

      for (String n : contactList) { 

       if (n.length() >= 10 && !n.startsWith("0217")) { 
        n = n.replace(" ", ""); 
        n = n.replace("+", ""); 
        n = n.replace("-", ""); 
        n = n.substring(n.length() - 10); 

        if (contactString.length() != 0) { 
         contactString.append(","); 
        } 
        contactString.append(n); 
       } 

      } 

      return contactString.toString(); 
     } else { 
      return null; 
     } 

    } 
} 

LogCat

04-10 09:17:32.303: E/AndroidRuntime(1098): FATAL EXCEPTION: main 
04-10 09:17:32.303: E/AndroidRuntime(1098): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.beproject.ourway/com.beproject.ourway.MainActivity}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.os.Looper.loop(Looper.java:137) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at dalvik.system.NativeStart.main(Native Method) 
04-10 09:17:32.303: E/AndroidRuntime(1098): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.database.AbstractCursor.checkPosition(AbstractCursor.java:424) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.database.CursorWrapper.getString(CursorWrapper.java:114) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at com.beproject.ourway.system.ContactsProvider.setContactsString(ContactsProvider.java:37) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at com.beproject.ourway.MainActivity.onCreate(MainActivity.java:25) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.Activity.performCreate(Activity.java:5104) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
04-10 09:17:32.303: E/AndroidRuntime(1098):  ... 11 more 

Answer 1

try { 
Log.d(TAG, "Contacts: " + people.getCount()); 
     people.moveToFirst(); 
     while (!people.isAfterLast()) { 
      String number = people.getString(indexNumber); 
     people.add(number); 
     } 
    } catch (Exception ignored) { 
    } 

Answer 2

Коды здесь:

int indexNumber = people.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER); 
people.moveToFirst(); 
do { 
    String number = people.getString(indexNumber); 
    contactList.add(number); 
} while (people.moveToNext()); 

не правы. Почему вы назвали String number = people.getString(indexNumber);? Это бессмысленно.

Попробуйте это:

while (people.moveToNext()){ 
    String number = people.getString(people.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 
    contactList.add(number); 
}