我试图在 ListView 中显示电话联系人，但在第一次获得许可后 UI 没有更新。我只能在重新启动应用程序时看到更改。 我尝试使用 notifyDataSetChanged 但没有任何改变。
public class ContactFragment extends Fragment {
ArrayList<Contact> contact;
ListView listView;
ContactAdapter adapter;
public static final int RequestPermissionCode = 1;
Cursor cursor;
String name, number;
public ContactFragment() {
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.contact_layout, container, false);
contact=new ArrayList<>();
accesscontact();
adapter = new ContactAdapter(getActivity(), contact);
listView = (ListView) rootView.findViewById(R.id.listview);
listView.setAdapter(adapter);
return rootView;
}
public void GetContactsIntoArrayList(){
cursor = getActivity().getApplicationContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null, null, null);
while (cursor.moveToNext()) {
name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
contact.add(new Contact(name,number));
}
cursor.close();
}
protected void accesscontact()
{
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.READ_CONTACTS)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.READ_CONTACTS},
RequestPermissionCode);
} else {
GetContactsIntoArrayList();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case RequestPermissionCode: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
GetContactsIntoArrayList();
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Can't read contact_layout without permission", Toast.LENGTH_LONG).show();
return;
}
}
}
}
最佳答案
尝试以下操作:
adapter = new ContactAdapter(getActivity(), contact);
listView = (ListView) rootView.findViewById(R.id.listview);
listView.setAdapter(adapter);
在 GetContactsIntoArrayList() 方法中使用这些行
public void GetContactsIntoArrayList(){
cursor = getActivity().getApplicationContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null, null, null);
while (cursor.moveToNext()) {
name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
contact.add(new Contact(name,number));
}
cursor.close();
adapter = new ContactAdapter(getActivity(), contact);
listView = (ListView) rootView.findViewById(R.id.listview);
listView.setAdapter(adapter);
}
希望这会奏效。
关于android - 从 android ContactsContract 数据库加载数据后 fragment 未填充，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44055981/