我有一个相当标准的片段布局中的应用。 在左边的列表视图扩展的片段和所使用的这取决于用户选择与左边的列表（显示数据，添加新数据，等等）做不同的事情的正确的面板。
我使用的是LoaderManager（先用时间装载机）与CommonWare的loaderex库因为我没有需要或愿望创建我的数据库，这样我可以用一个标准的CursorLoader内容提供商。 这种设置为显示我的名单的伟大工程。
我遇到的问题是，当我使用第二个片段将数据添加到数据库中。 我无法弄清楚如何触发列表的重新加载的第一个片段。 对于我的生活，我无法弄清楚如何抓住从第二首片装载机，使其意识到，需要对数据进行再次拉，我也似乎可以推测如何手动触发重新加载。
由于这是我在使用装载机第一次尝试，如果我做一些不当我很高兴（轻轻）再次向下导向更好的路径。
片段1
public class StudentListFragment extends ListFragment implements
LoaderManager.LoaderCallbacks<Cursor> {
private TAOpenHelper mDbHelper = null;
private MyExpandableListAdapter mAdapter = null;
private ExpandableListView lv = null;
private Button addStudentButton;
public static long mRowId = 0;
public SQLiteCursorLoader studentLoader=null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.leftlistfragment_entry, container,
false);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
addStudentButton = (Button) getActivity().findViewById(R.id.AddButton);
addStudentButton.setText(getResources().getString(
R.string.button_add_student));
addStudentButton.setOnClickListener(addStudentButtonHandler);
lv = (ExpandableListView) getListView();
mDbHelper = TAOpenHelper.getInstance(getActivity());
fillData();
getLoaderManager().getLoader(-1);
if (studentLoader != null && !studentLoader.isReset()) {
getLoaderManager().restartLoader(-1, null, this);
} else {
getLoaderManager().initLoader(-1, null, this);
}
}
private void fillData() {
mAdapter = new MyExpandableListAdapter(getActivity(), this,
R.layout.listlayout_exp_double_group,
R.layout.listlayout_exp_double_child,
new String[] { TeacherAidDB.STUDENT_FIRST,
TeacherAidDB.STUDENT_LAST }, new int[] {
R.id.ListItem1, R.id.ListItem2 }, new String[] {
TeacherAidDB.CLASS_NAME, TeacherAidDB.CLASS_LEVEL },
new int[] { R.id.ListItem1, R.id.ListItem2 });
lv.setAdapter(mAdapter);
}
public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {
protected final SparseIntArray mGroupMap;
private StudentListFragment mFragment;
public MyExpandableListAdapter(Context context,
StudentListFragment clf, int groupLayout, int childLayout,
String[] groupFrom, int[] groupTo, String[] childrenFrom,
int[] childrenTo) {
super(context, null, groupLayout, groupFrom, groupTo, childLayout,
childrenFrom, childrenTo);
mFragment = clf;
mGroupMap = new SparseIntArray();
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
int groupPos = groupCursor.getPosition();
int groupId = groupCursor.getInt(groupCursor
.getColumnIndex(TeacherAidDB.CLASS_ROWID));
mGroupMap.put(groupId, groupPos);
Loader<Cursor> loader = getActivity().getLoaderManager().getLoader(
groupId);
if (loader != null && !loader.isReset()) {
getActivity().getLoaderManager().restartLoader(groupId, null,
mFragment);
} else {
getActivity().getLoaderManager().initLoader(groupId, null,
mFragment);
}
return null;
}
public SparseIntArray getGroupMap() {
return mGroupMap;
}
}
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
if (id != -1) { // Child Cursor
studentLoader = new SQLiteCursorLoader(getActivity(), mDbHelper,
TeacherAidDB.STUDENT_LIST_CLASS_QUERY + id, null);
} else { // Group Cursor
studentLoader = new SQLiteCursorLoader(getActivity(), mDbHelper,
TeacherAidDB.STUDENT_LIST_QUERY, null);
}
return studentLoader;
}
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
int id = loader.getId();
if (id != -1) { // Child cursor
if (!data.isClosed()) {
SparseIntArray groupMap = mAdapter.getGroupMap();
int groupPos = groupMap.get(id);
mAdapter.setChildrenCursor(groupPos, data);
}
} else { // Groups cursor
mAdapter.setGroupCursor(data);
}
}
@Override
public void onLoaderReset(Loader<Cursor> arg0) {
mAdapter.changeCursor(null);
}
View.OnClickListener addStudentButtonHandler = new View.OnClickListener() {
public void onClick(View v) {
AddPerson personadd = AddPerson.newInstance(AddPerson.STUDENT, AddPerson.CREATE, mRowId);
getFragmentManager().beginTransaction()
.replace(R.id.rightpane, personadd).commit();
}
};
}
片段2
public class AddPerson extends Fragment {
public static int STUDENT = 0;
public static int TEACHER = 1;
public static int CREATE = 0;
public static int EDIT = 1;
private int mRowId;
private TAOpenHelper mDbHelper;
private Cursor personedit;
private Button commit;
private Button cancel;
int who;
int what;
long rowId;
static AddPerson newInstance(int type, int action, long rowid) {
AddPerson f = new AddPerson();
Bundle args = new Bundle();
args.putInt("type", type);
args.putInt("action", action);
args.putLong("rowid", rowid);
f.setArguments(args);
return f;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
who = getArguments().getInt("type");
what = getArguments().getInt("action");
rowId = getArguments().getInt("rowid");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.dialog_person_add, container, false);
mDbHelper = TAOpenHelper.getInstance(getActivity());
if (what == EDIT) {
if (who == STUDENT) {
// Student Edit stuff here
} else {
// Teacher Edit stuff here
}
} else {
if (who == STUDENT) {
// Student Create stuff here
} else {
// Teacher Create stuff here
}
}
// Code to gather data from user goes here
commit = (Button) v.findViewById(R.id.commitbutton);
commit.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
first = firstTxt.getText().toString();
last = lastTxt.getText().toString();
street = streetTxt.getText().toString();
city = cityTxt.getText().toString();
zip = zipTxt.getText().toString();
phone = phoneTxt.getText().toString();
email = emailTxt.getText().toString();
if (what == CREATE) {
processAdd(who);
} else {
processUpdate(who);
}
}
});
cancel = (Button) v.findViewById(R.id.cancelbutton);
cancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Fragment check = getFragmentManager().findFragmentById(
R.id.rightpane);
getFragmentManager().beginTransaction().remove(check).commit();
}
});
return v;
}
private void processAdd(int who) {
ContentValues initialValues = new ContentValues();
if (who == STUDENT) {
initialValues.put(TeacherAidDB.STUDENT_FIRST, first);
initialValues.put(TeacherAidDB.STUDENT_LAST, last);
initialValues.put(TeacherAidDB.STUDENT_STREET, street);
initialValues.put(TeacherAidDB.STUDENT_CITY, city);
initialValues.put(TeacherAidDB.STUDENT_STATE, state);
initialValues.put(TeacherAidDB.STUDENT_ZIP, zip);
initialValues.put(TeacherAidDB.STUDENT_PHONE, phone);
initialValues.put(TeacherAidDB.STUDENT_EMAIL, email);
initialValues.put(TeacherAidDB.STUDENT_BDAY, birthday);
// How to get studentLoader from fragment 1?
//studentLoader.insert(TeacherAidDB.STUDENT_TABLE, null, initialValues);
}
}
}
