Question

目前我有项目A（作为Android库）和项目B.

在Project B中，我使用页面片段进行设计。在页面片段1中，片段实际上是从项目A（库）中调用的。

如何在项目A上收到项目B的onclick值。

//在项目B上声明片段页面

CustFragment fragment1 = new CustFragment ();

//项目A上的onclick监听器

mContactList.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            Cursor cursor = (Cursor) parent.getAdapter().getItem(position);

            long rawId = cursor.getLong(cursor
                    .getColumnIndex(ContactsContract.Data.RAW_CONTACT_ID));

// how do i pass the value to B?

编辑：我用我这边的更多代码编辑了这篇文章

//在Project B上声明片段

public class MainPagerFragmentAdapter extends FragmentPagerAdapter {

ListFragment list;
SearchFragment search;  
public MainPagerFragmentAdapter(FragmentManager fragmentManager) {
    super(fragmentManager);
}

@Override
public int getCount() {
    return 2;
}

public String getPageTitle(int position) {
    switch (position) {
        case 0: return AppSingleton.getCurrentActivity().getString(R.string.pager_appointments_tab);
        case 1: return  AppSingleton.getCurrentActivity().getString(R.string.explist_filter_text);
    }
}

@Override
public Fragment getItem(int position) {

    switch (position) {             
        case 0:
            if (customerList == null)
                list = new ListFragment();
            return customerList;
        case 1:
            if (contactSearch == null)
                search = new SearchFragment();
            return contactSearch;
    }

    return null;
}

}

//项目A（库项目）上的onclick监听器

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

    super.onCreateView(inflater, container, savedInstanceState);
    log.info("ContactsFragment onCreateView");
    mContactFragmentView = inflater.inflate(R.layout.fragment_contacts,
            container, false);

    mContactList = (ListView) mContactFragmentView
            .findViewById(R.id.contacts_list);

    mContactList.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            Cursor cursor = (Cursor) parent.getAdapter().getItem(position);

            long rawId = cursor.getLong(cursor
                    .getColumnIndex(ContactsContract.Data.RAW_CONTACT_ID));

            // what have to done here to pass back to B dynamically

        }

    });
    getLoaderManager().initLoader(0, null, this);
    return mContactFragmentView;
}

java.lang.NullPointerException at com.contact.library.ContactsFragment $ 2.onItemClick（ContactsFragment.java:143）在android.widget.AdapterView.performItemClick（AdapterView.java:308）在android.widget.AbsListView.performItemClick（AbsListView.java:1509）在android.widget.AbsListView $ PerformClick.run（AbsListView.java:3467）在android.widget.AbsListView $ 3.run（AbsListView.java:4830）at android.os.Handler.handleCallback（Handler.java:733）at android.os.Handler.dispatchMessage（Handler.java:95）at android.os.Looper.loop（Looper.java:146）at android.app.ActivityThread.main（ActivityThread.java:5602）at java.lang.reflect.Method.invokeNative（Native Method）at java.lang.reflect.Method.invoke（Method.java:515）at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1283）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1099）at dalvik.system.NativeStart.main（Native Method）

Answer 1

您想要设置在片段A上触发的回调。类似于：

在您的库中创建一个界面：

public interface MyInterface {
  public void onRawIdAcquired(long rawId);
}

在FragmentA中的某个地方创建一个实例（并创建一个可以设置其值的setter）：

public class FragmentA extends Fragment {
...
MyInterface i;
...
public void setListener(MyInterface i) {
  this.i = i;
}

然后在rowId获取值时调用它：

long rawId = cursor.getLong(cursor.getColumnIndex(ContactsContract.Data.RAW_CONTACT_ID));
i.onRawIdAcquired(rawId);

现在在非库激活的PageFragment中，实现MyInterface并覆盖onRawIdAcquired：

public PageFragment extends Fragment implements MyInterface {
@Override
public void onRawIdAcquired(long rawId) {
  **// you can now use the value of rawId here.**
}

最后，在实例化FragmentA时，在setListener中传递PageFragment：

FragmentA f = ...;
PageFragment myPageFragment = ...;
f.setListener(myPageFragment);

Answer 2

在您的库项目中，创建从片段中调用变量的全局变量。如果你想轻松一点，你应该尝试这种方式。只是我的想法。希望得到帮助。 Android main project with library project - how to pass setting between projects

通过Page Fragment从Android库接收onclick值

2 个答案: