与FragmentPagerAdapter怪异dissappearing片段 [英] Weird dissappearing Fragments with FragmentPagerAdapter
问题描述
我试图建立一个有效,对于一个很好的用户界面的GridView片段。我已经使用了一些code样品,试图建立这种
我是否真的需要跟踪并保存我的片段的状态取向开关(显然我)还是我失去了一些东西?从它(它作为FragmentPagerAdapter文档)看起来像FragmentPagerAdapter声音保存所有的状态对我来说...
我只想说,这里是我的问题(我有4个片段,在他们一些textviews):
1 :当我在倾斜的Fragment0屏幕,基础数据消失,不再出现,直到我搬到Fragment2。
2 :当我倾斜的片段1,它的底层数据屏幕,Fragment0消失,片段1的数据不会再次出现,直到我去Fragment3但Fragment0的数据,当我去Fragment2(只是重新出现像上述情况1)。
3 :当我倾斜的Fragment2,它的底层数据的屏幕和片段1消失,如果我去Fragment3,如果我去Fragment0 Fragment2将重新出现片段1再次出现。
4。:当我倾斜Fragment3只Fragment2消失。
我明明做错事所以这里是我的code:
的这是我的onCreate(或它的一些ATLEAST):的
mAdapter =新FragPagerAdapter(getSupportFragmentManager());
mPager =(ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
的这是我FragmentPagerAdapter 的:
私有类FragPagerAdapter扩展FragmentPagerAdapter {
公共FragPagerAdapter(FragmentManager FM){
超(FM); } @覆盖
公众诠释的getCount(){
返回numFrags;
} @覆盖
公共片段的getItem(INT位置){ 返回ArrayFragment.newInstance(位置,mItem2.get(位置)); }}
下面是我的片段的(我ArrayAdapter):
公共静态类ArrayFragment扩展片段{ INT MNUM;
私人的ArrayList<项目> mItems;
私人GridAdapter myGridAdapter;
私有静态的GridView mGridView; 静态的newInstance ArrayFragment(INT NUM,ArrayList的<项目>项目){
ArrayFragment F =新ArrayFragment(); 捆绑ARGS =新包();
args.putInt(民,NUM);
args.putSerializable(项目,项目);
f.setArguments(参数); 返回F;
}
@燮pressWarnings(未登记)
@覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
MNUM = getArguments()!= NULL? getArguments()调用getInt(民):1。
mItems =(ArrayList的<项目>)(getArguments()= NULL getArguments()getSerializable(项目):!?NULL);
myGridAdapter =新GridAdapter(getActivity()getApplicationContext(),R.layout.grid_item,mItems); }
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
//视图V = inflater.inflate(R.layout.fragment_pager_list,集装箱,FALSE);
视图V = inflater.inflate(R.layout.grid,集装箱,FALSE);
观看电视= v.findViewById(R.id.text);
((的TextView)TV).setText(碎片#+ MNUM); mGridView =(GridView控件)v.findViewById(R.id.gridview);
返回伏;
} @覆盖
公共无效onActivityCreated(捆绑savedInstanceState){
super.onActivityCreated(savedInstanceState); } @覆盖
公共无效调用onStart()
{
super.onStart();
mGridView.setAdapter(myGridAdapter);
mGridView.setOnItemClickListener(新OnItemClickListener(){ @覆盖
公共无效onItemClick(适配器视图<>为arg0,ARG1观,诠释ARG2,
长ARG3){
Toast.makeText(getActivity(),mItems.get(ARG2).getSecret(),Toast.LENGTH_LONG).show();
} });
}
公共类GridAdapter扩展ArrayAdapter<项目> {
私人诠释计数;
私人LayoutInflater吹气;
私人上下文的背景下;
私人的ArrayList<项目>项目; 公共GridAdapter(上下文的背景下,INT资源,
ArrayList的<项目> items_){
超(背景下,资源);
数= items_.size();
项目= items_; 吹气=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// TODO自动生成构造函数存根
} @覆盖
公众诠释getCount将()
{
返回计数;
} @覆盖
公共项目的getItem(INT位置)
{
返回items.get(位置);
} @覆盖
众长getItemId(INT位置)
{
返回的位置;
} 公共无效setItems(ArrayList的<项目>的项目)
{
this.items =物品;
} @覆盖
公共查看getView(INT位置,查看convertView,父母的ViewGroup)
{
视图V = convertView;
尝试
{
V = inflater.inflate(R.layout.grid_item,NULL);
}
赶上(NullPointerException异常NPE)
{
npe.printStackTrace(); } 项目项目= items.get(位置); 尝试
{
TextView的名字=(TextView中)v.findViewById(R.id.grid_att_name);
TextView中值=(TextView中)v.findViewById(R.id.grid_att_value);
name.setText(item.getName());
value.setText(item.getValue());
}
赶上(NullPointerException异常NPE)
{
npe.printStackTrace(); } 返回伏;
}
}
}
我解决了这个问题,通过使用一个片段的状态适配器,我不得不添加的android:configChanges =方向
来活动的活动标签,里面的片段。
I'm trying to build a Fragment that holds a gridview for a nice UI. I have used some of the sample code to try and build this.
Do I really need to keep track and save the state of my fragments for orientation switches (apparently I do) or am I missing something? From the sound of it (it being the FragmentPagerAdapter docs) it seems like the FragmentPagerAdapter saves all states for me...
Suffice to say, here is my problem(I have 4 fragments with some textviews in them):
1. When I tilt the screen on Fragment0, the underlying data disappears and will not reappear until I move to Fragment2.
2. When I tilt the screen on Fragment1, the underlying data of it AND Fragment0 disappears and Fragment1's data wont reappear until I go to Fragment3 BUT Fragment0's data will reappear when I go to Fragment2 (just like case 1 above).
3. When I tilt the screen on Fragment2, the underlying data of it AND Fragment1 disappears and Fragment1 reappears if I go to Fragment3 and Fragment2 will reappear if I go to Fragment0.
4. When I tilt Fragment3 only Fragment2 disappears.
I'm obviously doing something wrong so here is my code:
Here is my onCreate(or some of it atleast):
mAdapter = new FragPagerAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
Here is my FragmentPagerAdapter:
private class FragPagerAdapter extends FragmentPagerAdapter {
public FragPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return numFrags;
}
@Override
public Fragment getItem(int position) {
return ArrayFragment.newInstance(position, mItem2.get(position));
}
}
Here is my Fragment (with my ArrayAdapter):
public static class ArrayFragment extends Fragment {
int mNum;
private ArrayList<Item> mItems;
private GridAdapter myGridAdapter;
private static GridView mGridView;
static ArrayFragment newInstance(int num, ArrayList<Item> items) {
ArrayFragment f = new ArrayFragment();
Bundle args = new Bundle();
args.putInt("num", num);
args.putSerializable("items", items);
f.setArguments(args);
return f;
}
@SuppressWarnings("unchecked")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
mItems = (ArrayList<Item>) (getArguments() != null ? getArguments().getSerializable("items") : null);
myGridAdapter = new GridAdapter(getActivity().getApplicationContext(), R.layout.grid_item, mItems);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
View v = inflater.inflate(R.layout.grid, container, false);
View tv = v.findViewById(R.id.text);
((TextView)tv).setText("Fragment #" + mNum);
mGridView = (GridView) v.findViewById(R.id.gridview);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public void onStart()
{
super.onStart();
mGridView.setAdapter(myGridAdapter);
mGridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(getActivity(), mItems.get(arg2).getSecret(), Toast.LENGTH_LONG).show();
}
});
}
public class GridAdapter extends ArrayAdapter<Item> {
private int count;
private LayoutInflater inflater;
private Context context;
private ArrayList<Item> items;
public GridAdapter(Context context, int resource,
ArrayList<Item> items_) {
super(context, resource);
count = items_.size();
items = items_;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// TODO Auto-generated constructor stub
}
@Override
public int getCount()
{
return count;
}
@Override
public Item getItem(int position)
{
return items.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
public void setItems(ArrayList<Item> items)
{
this.items = items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View v = convertView;
try
{
v = inflater.inflate(R.layout.grid_item, null);
}
catch (NullPointerException npe)
{
npe.printStackTrace();
}
Item item = items.get(position);
try
{
TextView name = (TextView) v.findViewById(R.id.grid_att_name);
TextView value = (TextView) v.findViewById(R.id.grid_att_value);
name.setText(item.getName());
value.setText(item.getValue());
}
catch (NullPointerException npe)
{
npe.printStackTrace();
}
return v;
}
}
}
I fixed this by using a Fragment State Adapter and I had to add android:configChanges="orientation"
to the activity tag of the activity that housed the fragments.
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