我试图将数据发送到子片段，但我一直在从logCat中获取此信息：
W/System.err﹕ java.lang.NullPointerException
W/System.err﹕ at com.myapp.fragments.CommunityClipsFragment.setNewData(CommunityClipsFragment.java:39)
11-12 14:07:58.159 17977-17977/com.myappW/System.err﹕ at com.myapp.fragments.CommunitySearchFragment.onAPIResponse(CommunitySearchFragment.java:123)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at com.myapp.server.Server$ServerTask.onPostExecute(Server.java:735)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at com.myapp.server.Server$ServerTask.onPostExecute(Server.java:526)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at android.os.AsyncTask.finish(AsyncTask.java:602)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at android.os.AsyncTask.access$600(AsyncTask.java:156)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:99)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at android.os.Looper.loop(Looper.java:137)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:4441)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:511)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-12 14:07:58.159 17977-17977/com.myapp W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
我想做什么：
在父片段中我有一个tabhost 2选项卡，但我使用asynctask和onpostExecute加载数据我从子片段调用setNewData方法。
这是父片段类：
public class CommunitySearchFragment extends Fragment {
private FragmentTabHost mTabHost;
private ArrayList<ClipboardVO> cArray;
private ArrayList<ClipsVO> clipsArray;
private int userId;
private Bundle b;
CommunityClipsFragment communityClipsFragment;
FragmentSearchMyClipboards fragmentSearchMyClipboards;
private void doTheRequest() {
if (getArguments().getString(IntentConstants.KEYWORD) != null)
if (getArguments().getString(IntentConstants.KEYWORD).length() > 0) {
HashMap<String, String> params = new HashMap<String, String>();
setUserData(params);
params.put(Server.FEEDPARAMS_KEYWORD, getArguments().getString(IntentConstants.KEYWORD));
params.put(Server.FEEDPARAMS_RESULTCOUNT, "100");
placeRequest(Server.APIMETHOD_SEARCHCOMMUNITY, Json.METHODNAME_PARSESEARCHCOMMUNITY, params);
}
}
@Override
public void onAPIResponse(ResultVO result) {
super.onAPIResponse(result);
if (result.getApiMethod().equals(Server.APIMETHOD_SEARCHCOMMUNITY)) {
HashMap<Integer, Object> searchList = (HashMap<Integer, Object>) result.getData();
clipsArray = (ArrayList<ClipsVO>) searchList.get(Consts.CLIPS);
ArrayList<Object> rClipsArray = new ArrayList<Object>();
userId = Integer.parseInt(UserProfile.getinstance().getUserData().getUserId());
if (clipsArray.size() > 0) {
for (int i = 0; i < clipsArray.size(); i++) {
ClipsVO clip = clipsArray.get(i);
if (clip.getOwnerUserId().equals(userId + "")) {
if (rClipsArray.size() == 0) {
//Add header for the Current User's clips in the result
ClipsVO headerClip = new ClipsVO();
headerClip.setHeader(true);
headerClip.setDescription(getLocalizationString("lblCommunityMyClips"));
rClipsArray.add(headerClip);
}
rClipsArray.add(clipsArray.remove(i));
i--;
}
}
if (clipsArray.size() > 0) {
//Add header for the other Clipboards in the result
ClipsVO headerClip = new ClipsVO();
headerClip.setHeader(true);
headerClip.setDescription(getLocalizationString("lblClips"));
rClipsArray.add(headerClip);
rClipsArray.addAll(clipsArray);
}
}
//Parse the Clipboards ffrom the result and group the user's clipboards seperately from others
int userId = Integer.parseInt(UserProfile.getinstance().getUserData().getUserId());
cArray = (ArrayList<ClipboardVO>) searchList.get(Consts.CLIPBOARD);
ArrayList<Object> rArray = new ArrayList<Object>();
if (cArray.size() > 0) {
for (int i = 0; i < cArray.size(); i++) {
ClipboardVO clipboard = cArray.get(i);
if (clipboard.getUserId() == userId) {
if (rArray.size() == 0) {
//Add header for the Current User's Clipboards in the result
ClipboardVO headerClipboard = new ClipboardVO();
headerClipboard.setHeader(true);
headerClipboard.setClipboardName(getLocalizationString("lblMyClipboards"));
rArray.add(headerClipboard);
}
rArray.add(cArray.remove(i));
i--;
}
}
if (cArray.size() > 0) {
//Add header for the other Clipboards in the result
ClipboardVO headerClipboard = new ClipboardVO();
headerClipboard.setHeader(true);
headerClipboard.setClipboardName(getLocalizationString("lblClipboards"));
rArray.add(headerClipboard);
rArray.addAll(cArray);
}
}
try {
b.putSerializable("communityClipboards", rArray);
b.putParcelableArrayList("communityClips", clipsArray);
communityClipsFragment.setNewData(clipsArray);
fragmentSearchMyClipboards.setNewData(rArray);
Log.v("---", "putting comClips " + rClipsArray.size());
} catch (Exception e) {
e.printStackTrace();
}
searchList.remove(Consts.CLIPBOARD);
searchList.remove(Consts.CLIPS);
rClipsArray.addAll(rArray);
searchList.put(Consts.COMMUNITY, rClipsArray);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
doTheRequest();
mView = inflater.inflate(R.layout.fragment_community_search_tab, container, false);
communityClipsFragment= new CommunityClipsFragment();
fragmentSearchMyClipboards=new FragmentSearchMyClipboards();
mTabHost = (FragmentTabHost) mView.findViewById(android.R.id.tabhost);
mTabHost.setup(getActivity(), getChildFragmentManager(), R.layout.fragment_comminity);
//setup tabhost
Log.v("---", "adding tabs");
b = new Bundle();
mTabHost.addTab(mTabHost.newTabSpec("clips").setIndicator(getLocalizationString("lblClips")),
communityClipsFragment.getClass(), b);
mTabHost.addTab(mTabHost.newTabSpec("clipboards").setIndicator(getLocalizationString("lblClipboards")),
fragmentSearchMyClipboards.getClass(), b);
final int reverseTabs[] = {1, 0};
mTabHost.getTabWidget().setDividerDrawable(R.color.color_translucent_grey);
View v = mTabHost.getTabWidget().getChildTabViewAt(reverseTabs[mTabHost.getCurrentTab()]);
((TextView) v.findViewById(android.R.id.title)).setTypeface(null, Typeface.NORMAL);
((TextView) v.findViewById(android.R.id.title)).setTextColor(Color.parseColor("#a3a3a3"));
v.setBackgroundResource(R.drawable.border);
View v2 = mTabHost.getTabWidget().getChildTabViewAt(mTabHost.getCurrentTab());
v2.setBackgroundColor(getResources().getColor(R.color.transparent));
((TextView) v2.findViewById(android.R.id.title)).setTextColor(getResources().getColor(R.color.color_orange));
v2.setBackgroundResource(R.drawable.border);
mTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
@Override
public void onTabChanged(String s) {
View v = mTabHost.getTabWidget().getChildTabViewAt(reverseTabs[mTabHost.getCurrentTab()]);
((TextView) v.findViewById(android.R.id.title)).setTypeface(null, Typeface.NORMAL);
((TextView) v.findViewById(android.R.id.title)).setTextColor(Color.parseColor("#a3a3a3"));
v.setBackgroundResource(R.drawable.border);
View v2 = mTabHost.getTabWidget().getChildTabViewAt(mTabHost.getCurrentTab());
v2.setBackgroundResource(R.drawable.border);
((TextView) v2.findViewById(android.R.id.title)).setTypeface(null, Typeface.BOLD);
((TextView) v2.findViewById(android.R.id.title)).setTextColor(getResources().getColor(R.color.color_orange));
}
});
return mView;
}
@Override
public void onDestroyView() {
super.onDestroyView();
mTabHost = null;
}
}
和一个子片段：
public class CommunityClipsFragment extends Fragment {
private View mView;
private ListView list;
private MyClipboardSearchAdapter adapter;
private ArrayList<ClipsVO> rClipsArray;
public void setNewData(ArrayList<ClipsVO> data){
if(data==null){
data=new ArrayList<ClipsVO>();
}
rClipsArray=data;
//CommunityClipsFragment.java line:39
adapter.notifyDataSetChanged();
}
private void setupData() {
adapter = new MyClipboardSearchAdapter(getActivity(),rClipsArray);
list.setAdapter(adapter);
TextView emptyTxt = (TextView) mView.findViewById(R.id.empty);
emptyTxt.setText(getLocalizationString("txtPeopleSearchNoResult"));
emptyTxt.setTextSize(14);
list.setEmptyView(emptyTxt);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
Object itemObject = rClipsArray.get(position);
ArrayList<ClipsVO> clipsList = new ArrayList<ClipsVO>();
ClipsVO clipVO = (ClipsVO) itemObject;
clipsList.add(clipVO);
Intent intent = new Intent(getActivity(), ClipsListDetailActivity.class);
intent.putExtra(IntentConstants.CLIP_DATA, clipVO);
intent.putExtra(IntentConstants.CLIP_ID, clipVO.getClipId());
intent.putExtra(IntentConstants.IS_USERCLIPS, false);
intent.putExtra(IntentConstants.IS_COMMUNITYCLIPS, true);
VisitorData.getinstance().setClipsList(rClipsArray);
intent.putExtra(IntentConstants.CLIP_INDEX_POSITION, 0);
intent.putExtra(IntentConstants.CLIPBOARD_INDEX_POSITION, 0);
startActivity(intent);
}
});
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
savedInstanceState) {
mView = inflater.inflate(R.layout.fragment_list_layout, container, false);
list = (ListView) mView.findViewById(R.id.fragment_list_layout_list);
rClipsArray = new ArrayList<ClipsVO>();
if (getArguments().getParcelableArrayList("communityClips") != null) {
Log.v("---", "community clips size:" + (getArguments().getParcelableArrayList("communityClips")).size());
rClipsArray = new ArrayList<ClipsVO>();
rClipsArray = getArguments().getParcelableArrayList("communityClips");
setupData();
}
return mView;
}
}
所以我的问题是我做错了什么。如何从子片段的父片段发送新数据，并显示新数据？
P.S。很抱歉有很多代码，但我试着尽可能地解释