相关疑难解决方法(0)

我正在制作Android应用,需要拨打电话的联系人列表.我需要调用联系人列表功能,选择联系人,然后使用联系人姓名返回我的应用程序.这是我在互联网上获得的代码,但它不起作用.

import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.view.View;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

public class Contacts extends ListActivity {

    private ListAdapter mAdapter;
    public TextView pbContact;
    public static String PBCONTACT;
    public static final int ACTIVITY_EDIT=1;
    private static final int ACTIVITY_CREATE=0;

    // Called when the activity is first created. 
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        Cursor C = getContentResolver().query(People.CONTENT_URI, null, null, null, null);
        startManagingCursor(C);

        String[] columns = new String[] {People.NAME};
        int[] names = …

我试图通过电话获得whatsapp联系,我得到whatsapp联系的总数,但是从RawContacts如何获得whatsapp我不知道的号码和名称.我试图找到解决方案,但无法得到确切的解决方案.请帮我.

我把我的代码放在下面.

ContentResolver cr = context.getContentResolver();

Cursor c = cr.query(
                        ContactsContract.RawContacts.CONTENT_URI,
                        new String[] { ContactsContract.RawContacts.CONTACT_ID, ContactsContract.RawContacts.DISPLAY_NAME_PRIMARY },
                        ContactsContract.RawContacts.ACCOUNT_TYPE + "= ?",
                        new String[] { "com.whatsapp" },
                        null);

                ArrayList<String> myWhatsappContacts = new ArrayList<>();

                String projection[] = { ContactsContract.CommonDataKinds.Phone.NUMBER };

                if(c != null) {
                    if (c.getCount() > 0) {
                        while (c.moveToNext()) {

                            String whatsappContactId = c.getString(c.getColumnIndex(ContactsContract.RawContacts.Data._ID));

                            Cursor dataCursor = cr.query(
                                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                                    projection,
                                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
                                    new String[]{whatsappContactId}, null);
                            // You can also read RawContacts.CONTACT_ID to read the
                            // …