我正在尝试构建一个Fragment,它包含一个很好的UI的gridview . 我已经使用了一些示例代码来尝试构建它 .
我是否真的需要跟踪并保存我的片段状态以便定位开关(显然我这样做)或者我错过了什么?从它的声音(它是FragmentPagerAdapter文档)看起来像FragmentPagerAdapter为我保存所有状态...
我只想说,这是我的问题(我有4个片段,其中有一些textview):
1. 当我在Fragment0上倾斜屏幕时,基础数据消失,直到我移动到Fragment2后才会重新出现 .
2. 当我在Fragment1上倾斜屏幕时,它的基础数据AND Fragment0消失,当我转到Fragment2时,Fragment1 's data wont reappear until I go to Fragment3 BUT Fragment0'的数据将重新出现(就像上面的情况1一样) .
3. 当我在Fragment2上倾斜屏幕时,它的基础数据AND Fragment1消失,如果我转到Fragment3则会再次出现Fragment1,如果我去Fragment0,Fragment2会重新出现 .
4. 当我倾斜Fragment3时,只有Fragment2消失 .
我显然做错了所以这是我的代码:
这是我的onCreate(或其中的一些至少):
mAdapter = new FragPagerAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
这是我的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));
}
}
这是我的片段(使用我的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;
}
}
}
1 回答
我通过使用片段 State 适配器修复此问题,我必须将
android:configChanges="orientation"
添加到容纳片段的活动的活动标记中 .