这是我的活动类，使用viewpager和tablayout
在oncreate方法中调用片段 public class testScreen2 extends AppCompatActivity implements View.OnClickListener {
MyPageAdapter pageAdapter;
private ProgressDialog pDialog;
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
TextView mTextField;
TimerTask timerTask;
Timer timer;
int numberSubmitted=0;
int s_id =20;
ImageView ivSubmit;
TextView tv;
ViewPager pager;
String jsonData;
static ArrayList<ArrayList<Integer>> options_answer = new ArrayList<ArrayList<Integer>>();
static ArrayList<ArrayList<Integer>> options_answer_submitted = new ArrayList<ArrayList<Integer>>();
Button button;
JSONParser jsonParser = new JSONParser();
MyPageAdapter adapter;
int[] type = {2, 3, 4, 9, 2};
int size;
static ArrayList<Integer> OPTION_COUNT_AGAIN= new ArrayList<Integer>();
static ArrayList<Integer> ID_LIST= new ArrayList<Integer>();
static ArrayList<Integer> TYPE= new ArrayList<Integer>();
static ArrayList<Integer> SUBQUESTION_OPTION_COUNT= new ArrayList<Integer>();
static ArrayList<Integer> mcq_id= new ArrayList<Integer>();
static ArrayList<Integer> section_question_id= new ArrayList<Integer>();
static ArrayList<Integer> yn_answer= new ArrayList<Integer>();
static ArrayList<Integer> yn_id= new ArrayList<Integer>();
static ArrayList<Integer> tf_id= new ArrayList<Integer>();
static ArrayList<Integer> tf_answer= new ArrayList<Integer>();
static ArrayList<Integer> comp_ques_id= new ArrayList<Integer>();
static ArrayList<Integer> subques_tf_ans= new ArrayList<Integer>();
static ArrayList<Integer> subques_yn_ans= new ArrayList<Integer>();
static ArrayList<Integer> comp_subques_id= new ArrayList<Integer>();;
static ArrayList<String> mcq= new ArrayList<String>();
static ArrayList<String> tf= new ArrayList<String>();
static ArrayList<String> question= new ArrayList<String>();
static ArrayList<String> yn,comp_ques_head= new ArrayList<String>();
static ArrayList<String> comp_subques= new ArrayList<String>(); // comp_subquestion;
static ArrayList<ArrayList<String>> options=new ArrayList<ArrayList<String>>();
static ArrayList<ArrayList<String>> subques_options=new ArrayList<ArrayList<String>>();;
static ArrayList<ArrayList<Integer>> optionsId=new ArrayList<ArrayList<Integer>>();
static ArrayList<ArrayList<Integer>> CompSubquesOptionsIdArrayListSelected = new ArrayList<ArrayList<Integer>>();
static ArrayList<ArrayList<Integer>> subques_options_id=new ArrayList<ArrayList<Integer>>();;
static ArrayList<ArrayList<Integer>> subques_options_answer = new ArrayList<ArrayList<Integer>>();
static ArrayList<ArrayList<Integer>> optionsIdArrayListSelected = new ArrayList<ArrayList<Integer>>();
static ArrayList<Integer> TYPE_SUB = new ArrayList<Integer>();
static ArrayList<ArrayList<Integer>> optionsSubmitted = new ArrayList<ArrayList<Integer>>();
static ArrayList<Integer> attempted = new ArrayList<Integer>();
int Length;
static ArrayList<String> MCQ_SELECTED_OPTIONS = new ArrayList<String>();
static ArrayList<Integer> MCQ_ATTEMPT_PREVIOUS = new ArrayList<Integer>();
static ArrayList<String> SUB_QUES_IN_SELECTED_OPTIONS= new ArrayList<String>();
static ArrayList<Integer> SUB_QUES_IN_ATTEMPT_PREVIOUS = new ArrayList<Integer>();
static ArrayList<Integer> TF_CORRECT= new ArrayList<Integer>();
static ArrayList<Integer> YN_CORRECT = new ArrayList<Integer>();
static ArrayList<Integer> TF_ATTEMPT_PREVIOUS = new ArrayList<Integer>();
static ArrayList<Integer> YN_ATTEMPT_PREVIOUS = new ArrayList<Integer>();
static ArrayList<Integer> COMP_TF_ATTEMPT_PREVIOUS = new ArrayList<Integer>();
static ArrayList<Integer> COMP_TF_CORRECT = new ArrayList<Integer>();
static ArrayList<Integer> COMP_YN_ATTEMPT_PREVIOUS = new ArrayList<Integer>();
static ArrayList<Integer> COMP_YN_CORRECT = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_screen2);
Log.d("Testing","In testscreen 2");
ivSubmit=(ImageView)findViewById(R.id.imageView3);
mTextField=(TextView)findViewById(R.id.counter);
ivSubmit.setOnClickListener(this);
button=(Button)findViewById(R.id.testscreen);
button.setOnClickListener(this);
Log.d("Debug", "Reached testscreen2");
size = type.length;
Intent intent = getIntent();
if (options != null) {
Log.d("Debug", "Got arraylist options");
}
Length = intent.getIntExtra("Length", 0);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
for (int i = 0; i < question.size(); i++) {
int a = i + 1;
tabLayout.addTab(tabLayout.newTab().setText("" + a));
Log.d("TYPE","TYPE is "+TYPE.get(i));
Log.d("Debug","We have added tabnumber "+a);
}
tabLayout.setTabGravity(TabLayout.GRAVITY_CENTER);
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
pager = (ViewPager) findViewById(R.id.viewpager);
adapter = new MyPageAdapter(getSupportFragmentManager(), tabLayout.getTabCount(), TYPE, TYPE_SUB);
pager.setOffscreenPageLimit(tabLayout.getTabCount() - 1);
// the number of "off screen" pages to keep loaded each side of the current page
pager.setAdapter(adapter);
pager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}}
现在我也发布了FragmentPagerAdapter类的代码
public class MyPageAdapter extends FragmentPagerAdapter {
int mNumOfTabs;
String[] options;
int[] quesType;
questionOptionBoth tab1;
true_false tab2;
yes_no_fragment tab3;
comprehension_tf tab4;
comprehension_yn tab5;
comprehension_mcq tab6;
//fragment_comprehension tab4;
ArrayList<Integer> TYPE, TYPE_SUB;
public MyPageAdapter(FragmentManager fm, int NumOfTabs, ArrayList<Integer> TYPE, ArrayList<Integer> TYPE_SUB) {
super(fm);
this.mNumOfTabs = NumOfTabs;
this.TYPE=TYPE;
this.TYPE_SUB=TYPE_SUB;
}
@Override
public Fragment getItem(int position) {
int type=TYPE.get(position);
int type_sub=TYPE_SUB.get(position);
if(type==2 && type_sub==0) {
tab1 = questionOptionBoth.newInstance(position);
Log.d("Fragment","We have created mcq fragment at position "+position );
return tab1;
}
else if(type==3 && type_sub==0)
{
tab2 = true_false.newInstance(position);
return tab2;
}
else
{
return null;
}
}
@Override
public int getCount() {
return mNumOfTabs;
}
}
现在，问题是片段的oncreate方法没有被调用，但片段正在被实例化。这在运行pre-lollipop版本的android的设备中运行良好，但在棒棒糖和上面一些片段只是实例化但是他们的生命周期方法如onCreate和onAttach没有被调用我也发布了片段代码供参考。
public class questionOptionBoth extends Fragment implements MyRecyclerViewAdapter.MyInterface {
ImageView ivQuestion;
private MyRecyclerViewAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
String ques;
// TODO: Rename and change types of parameters
private int tabNumber;
public static final String TAB_NUMBER = "TAB_NUMBER";
RecyclerView mRecyclerView;
ArrayList<String> optionsArrayList = new ArrayList<String>();
ArrayList<Integer> optionsIdArrayList = new ArrayList<Integer>();
ArrayList<Integer> optionsIdArrayListSelected = new ArrayList<Integer>();
ArrayList<Integer> optionsArrayListPrevSelected = new ArrayList<Integer>();
LinearLayout linearQuestionOption;
String optionsMarked;
String[] optionPreviouslyMarked;
public static final questionOptionBoth newInstance(int tabNumber) {
Log.d("DebugQO","We are in mcq fragment at tabnumber "+tabNumber);
questionOptionBoth f = new questionOptionBoth();
Bundle bdl = new Bundle();
bdl.putInt(TAB_NUMBER, tabNumber);
f.setArguments(bdl);
return f;
}
@Override
public void onAttach(Context context) {
Log.d("Attach","We are in onattach method");
super.onAttach(context);
}
@Override
public void onAttach(Activity activity) {
Log.d("Attach","We are in onattach method");
super.onAttach(activity);
}
@Override
public void onPause() {
Log.d("Pause","Onpause is called");
super.onPause();
}
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d("Debug","We are in oncreate method at tabnumber "+tabNumber);
super.onCreate(savedInstanceState);
if (getArguments() != null) {
tabNumber = getArguments().getInt(TAB_NUMBER);
Log.d("TabNumber","Tabnumber is "+tabNumber);
optionsArrayList = ((testScreen2) getActivity()).getOptionsFromQues(tabNumber);
optionsIdArrayList = ((testScreen2) getActivity()).getOptionIdsFromQues(tabNumber);
optionsMarked=((testScreen2)getActivity()).get_MCQ_SELECTED_OPTIONS(tabNumber);
if(optionsMarked==null||optionsMarked.equals("null"))
{} else{
optionPreviouslyMarked= optionsMarked.split(",");
}
if (optionsArrayList != null) {
Log.d("Debug", "Got options list in oncreate method in fragment");
}
if (optionsIdArrayList != null) {
for (int i = 0; i < optionsIdArrayList.size(); i++) {
optionsIdArrayListSelected.add(i, 0);
optionsArrayListPrevSelected.add(i,0);
Log.d("OptionIDArraylist","OPtionIDArrayList previously selected "+ i+" at tabnumber"+tabNumber+" is "+optionsArrayListPrevSelected.get(i));
}
if(optionsMarked==null||optionsMarked.equals("null"))
{} else
{
Log.d("options marked", "options marked is not null");
Log.d("options marked","options marked is "+optionsMarked);
for(int z=0;z<optionPreviouslyMarked.length;z++)
{
int position=optionsIdArrayList.indexOf(Integer.valueOf(optionPreviouslyMarked[z].trim()));
optionsIdArrayListSelected.set(position,Integer.valueOf(optionPreviouslyMarked[z].trim()));
optionsArrayListPrevSelected.add(position, 1);
}
}
((testScreen2) getActivity()).CompSubquesOptionsIdArrayListSelected.add(tabNumber,null);
((testScreen2) getActivity()).optionsIdArrayListSelected.add(tabNumber, new ArrayList<Integer>(optionsIdArrayListSelected));
}
Log.d("Debug","The size in questionOptionBoth at tabNumber "+tabNumber+" is "+optionsIdArrayList.size());
ques = ((testScreen2) getActivity()).getQues(tabNumber);
// String[] quesParts = ques.split("#IM@Ge#B!n@RyD@T@#");
// quesData = quesParts[0];
// quesImage = quesParts[1];
Log.d("Debug", "Got questions");
}
else
{
Log.d("tabbb","tab number is null");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
Log.d("DebugOncreateV","We are in oncreateview at tabnumber "+tabNumber);
final View rootView = inflater.inflate(R.layout.fragment_question_option_both, container, false);
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.option_recycler_view);
Log.d("Debug", "Initialised recycler view");
mRecyclerView.setHasFixedSize(true);
Log.d("Debug", "Set the fixed size as true");
mLayoutManager = new LinearLayoutManager(getContext());
Log.d("Debug", "Reached layout manager");
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyRecyclerViewAdapter(optionsArrayList, optionsIdArrayList, this,getContext(),optionsArrayListPrevSelected);
Log.d("Debug", "Initialised adapter");
mRecyclerView.setAdapter(mAdapter);
Log.d("Debug", "Set adapter");
linearQuestionOption=(LinearLayout)rootView.findViewById(R.id.linearQuestionOption);
return rootView;
}
public TextView addTextView()
{
TextView tv= new TextView(getContext());
// tv.setPadding(10, 0, 10, 0);
FlowLayout.LayoutParams lp = new FlowLayout.LayoutParams(FlowLayout.LayoutParams.WRAP_CONTENT, FlowLayout.LayoutParams.WRAP_CONTENT);
tv.setLayoutParams(lp);
//tv.setTypeface(null, Typeface.BOLD);
tv.setTextColor(Color.parseColor("#000000"));
return tv;
}
public ImageView addImageView()
{
ImageView iv= new ImageView(getContext());
// iv.setPadding(10, 0, 10, 0);
FlowLayout.LayoutParams lp = new FlowLayout.LayoutParams(FlowLayout.LayoutParams.WRAP_CONTENT, FlowLayout.LayoutParams.WRAP_CONTENT);
iv.setLayoutParams(lp);
return iv;
}
@Override
public void onClickCheckBox(int event, int position) {
if (event == 1) {
int id = optionsIdArrayList.get(position);
((testScreen2) getActivity()).optionsIdArrayListSelected.get(tabNumber).set(position, id);
Toast.makeText(getContext(), "We have clicked " + position + " checkbox", Toast.LENGTH_SHORT).show();
} else {
((testScreen2) getActivity()).optionsIdArrayListSelected.get(tabNumber).set(position, 0);
}
}