是否有可能将不同的项目添加到android listview

Question

我在我的应用程序中有一个ListView，我从用户电话簿中获取联系人，然后将其显示到ListView中，现在我想要做的就是根据某些条件（例如，我的应用程序）在ListView项目中添加不同的子视图，以检查每个电话簿联系人的可用性。服务器数据库，我要实现的是为该特定联系人添加语音/视频通话按钮，并为数据库中不可用的所有其他联系人添加邀请按钮。

我的条件适用于ListView项目，语音呼叫按钮，视频呼叫按钮和邀请按钮的这三个孩子，而我的条件是如果用户在数据库中可用，那么我只想显示语音/视频呼叫按钮并隐藏邀请按钮，但是如果用户无法使用，则我要显示邀请按钮并隐藏音频/视频通话按钮

列表显示

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ListView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/contacts_listview"/>

</RelativeLayout>

ListView项目

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal"
android:minHeight="?android:attr/listPreferredItemHeight"
android:padding="16dp">

<ImageView
    android:id="@+id/contact_item_icon"
    android:layout_width="50dp"
    android:layout_height="50dp"/>

<LinearLayout
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:orientation="vertical"
    android:paddingLeft="16dp">

    <TextView
        android:id="@+id/contact_item_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Feel The Light" />


    <TextView
        android:id="@+id/contact_item_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Home" />



</LinearLayout>

<ImageButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_user_audio_call_dark"/>

<ImageButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_user_video_call_dark"/>

<Button
    android:layout_width="wrap_content"
    android:layout_height="30dp"
    android:text="Invite"
    android:background="@drawable/selector_button_green_oval"
    android:textColor="@color/white"/>

</LinearLayout>

ContactsFragment

public class ContactsAdapter extends ArrayAdapter<ContactItem> {
private static final String LOG_TAG = ContactsAdapter.class.getSimpleName();

public ContactsAdapter(Activity context, List<ContactItem> contactItems) {
    super(context, 0, contactItems);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ContactItem contactItem = getItem(position);

    if (convertView == null) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.contact_list_item, parent, false);
    }

    ImageView contactImage = (ImageView) convertView.findViewById(R.id.contact_item_icon);
    contactImage.setImageResource(contactItem.contactImage);

    TextView contactName = (TextView) convertView.findViewById(R.id.contact_item_name);
    contactName.setText(contactItem.contactName);

    TextView contactNumber = (TextView) convertView.findViewById(R.id.contact_item_number);
    contactNumber.setText(contactItem.contactNumber);

    return convertView;
}
}

ContactsFragment

public class ContactsListFragment extends Fragment {

private ContactsAdapter contactsAdapter;

public static ContactsListFragment newInstance() {
    return new ContactsListFragment();
}

public ContactsListFragment() {

}

ArrayList<String> contactName = new ArrayList<>();
ArrayList<String> contactNumber = new ArrayList<>();

ArrayList<ContactItem> contactsAvailable = new ArrayList<>();
ArrayList<ContactItem> contactsInvite = new ArrayList<>();

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);



    Cursor cursor = getActivity().getContentResolver().query(
            ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null
    );

    String currentNumber = "";

    while (cursor.moveToNext()) {

        String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
        String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
        number = number.replaceAll(" ", "");

        char c = number.charAt(0);
        char c1 = number.charAt(1);
        String s = Character.toString(c)+Character.toString(c1);

        if (s.equals("00")) {
            number = number.replaceAll("00", "+");
        }

        if (number.length() == 12) {
            number = "+" + number;
        }

        if (number.length() == 13) {
            if (!currentNumber.equals(number)) {
                contactName.add(name);
                contactNumber.add(number);
            }

        }

        currentNumber = number;

    }

}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    final View rootView = inflater.inflate(R.layout.fragment_contacts_list, container, false);

    QBPagedRequestBuilder pagedRequestBuilder = new QBPagedRequestBuilder();
    pagedRequestBuilder.setPage(1);
    pagedRequestBuilder.setPerPage(50);

    QBUsers.getUsersByLogins(contactNumber, pagedRequestBuilder, new QBEntityCallback<ArrayList<QBUser>>() {
        @Override
        public void onSuccess(ArrayList<QBUser> qbUsers, Bundle bundle) {
            for (int i = 0; i < qbUsers.size(); i++) {
                ContactItem contactItem = new ContactItem(qbUsers.get(i).getFullName(), qbUsers.get(i).getLogin(), R.drawable.ic_launcher);
                contactsAvailable.add(contactItem);

            }

            contactsAdapter = new ContactsAdapter(getActivity(), contactsAvailable);

            ListView listView = (ListView) rootView.findViewById(R.id.contacts_listview_available);
            listView.setAdapter(contactsAdapter);

        }

        @Override
        public void onError(QBResponseException e) {
            Toast.makeText(getActivity(), e.toString(), Toast.LENGTH_LONG).show();
        }
    });



    return rootView;

}
}

Answer 1

您可以在ContactItem类上添加一个标志，并将其设置为true或false（如果它在数据库中可用），然后根据此标志设置适配器中按钮的可见性。

Answer 2

尝试这个：

1. 在ContactItem.java类中添加一个boolean标志isAvailableInDB 。
2. 从phonebook获取联系人列表，并与服务器database进行逐一检查。
3. 如果contactItem在你的存在database刚刚成立标志isAvailableInDB为true oterwise false为contactItem 。
4. 之后，将contactItem添加到ArrayList
5. 创建ContactsAdapter并将其设置为ListView
6. 最后，在适配器的getView()方法中添加一个条件，以检查contactItem标志isAvailableInDB 。 如果为true ，则显示语音/视频呼叫按钮并隐藏邀请按钮；如果为false ，则显示邀请按钮并隐藏语音/视频呼叫按钮。

给XML按钮的ID：

<ImageButton
    android:id="@+id/button_voice_call"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_user_audio_call_dark"/>

<ImageButton
    android:id="@+id/button_video_call"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_user_video_call_dark"/>

<Button
    android:id="@+id/button_invite"
    android:layout_width="wrap_content"
    android:layout_height="30dp"
    android:text="Invite"
    android:background="@drawable/selector_button_green_oval"
    android:textColor="@color/white"/>

在适配器的getView（）方法中：

@Override
public View getView(int position, View convertView, ViewGroup parent) {

ContactItem contactItem = getItem(position);

if (convertView == null) {
    convertView = LayoutInflater.from(getContext()).inflate(R.layout.contact_list_item, parent, false);
}

ImageView contactImage = (ImageView) convertView.findViewById(R.id.contact_item_icon);
contactImage.setImageResource(contactItem.contactImage);

TextView contactName = (TextView) convertView.findViewById(R.id.contact_item_name);
contactName.setText(contactItem.contactName);

TextView contactNumber = (TextView) convertView.findViewById(R.id.contact_item_number);
contactNumber.setText(contactItem.contactNumber);

ImageButton buttonVoiceCall= (ImageButton) convertView.findViewById(R.id.button_voice_call);
ImageButton buttonVideoCall= (ImageButton) convertView.findViewById(R.id.button_video_call);
Button buttonVoiceCall= (Button) convertView.findViewById(R.id.button_invite);

if(contactItem.getIsAvailableInDB())
{
     buttonVoiceCall.setVisibility(View.VISIBLE);
     buttonVideoCall.setVisibility(View.VISIBLE);
     buttonInvite.setVisibility(View.GONE);
}
else
{
     buttonVoiceCall.setVisibility(View.GONE);
     buttonVideoCall.setVisibility(View.GONE);
     buttonInvite.setVisibility(View.VISIBLE);
}
return convertView;
}

希望对您有帮助〜