第二次加载ListView无法加载

fxfxfxfxw 2016-07-24 01:21:19

第一次打开程序，ListView是正常加载的

第二次点击主页时，ListView就不在了

MainActivity:

public class MainActivity extends AppCompatActivity{



    private RadioGroup radioGroup;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Fragment fragment=new ViewPagerFragment();

        getSupportFragmentManager().beginTransaction()

                .add(R.id.Linear,fragment)

                .commit();

        radioGroup=(RadioGroup)findViewById(R.id.radiogroup);

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override

            public void onCheckedChanged(RadioGroup group, int checkedId) {

                Fragment fragment=FragmentFactory.creatFragment(checkedId);

                getSupportFragmentManager().beginTransaction()

                        .replace(R.id.Linear,fragment)

                        .commit();

            }

        });



    }



}

ViewPager加载的ListView:

public class ViewFragment extends Fragment {

    private ListView listView;

    private List<Map<String,Object>> datalist;

    private SimpleAdapter simpleAdapter;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view= inflater.inflate(R.layout.view,container,false);

        listView= (ListView) view.findViewById(R.id.listView);

        datalist = new ArrayList<Map<String,Object>>();

        simpleAdapter=new SimpleAdapter(getActivity(),getdata(),R.layout.item,new String[]{"pic","text"},new int[]{R.id.pic,R.id.textView});

        listView.setAdapter(simpleAdapter);

        return view;

    }

    private List<Map<String,Object>> getdata()

    {

        for(int i=1;i<10;i++) {

            Map<String,Object> map=new HashMap<String,Object>(); //初始化Map

            map.put("pic", R.mipmap.ic_launcher);      //通过键赋值

            map.put("text", "内容"+i);

            datalist.add(map);      //把map放入List

        }

        return datalist;

    }

}

ViewPager:

public class ViewPagerFragment extends Fragment{

    private List<String> tablist;

    private List<android.support.v4.app.Fragment> fraglist;

    private PagerTabStrip tab;

    private ViewPager viewPager;

    @Nullable

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view=inflater.inflate(R.layout.viewpager,container,false);

        fraglist=new ArrayList<android.support.v4.app.Fragment>();   //初始化

        tablist=new ArrayList<String>();

        fraglist.add(new ViewFragment());

        fraglist.add(new ViewFragment());

        tablist.add("第一页");

        tablist.add("第二页");

        viewPager=(ViewPager)view.findViewById(R.id.viewpager);

        tab=(PagerTabStrip)view.findViewById(R.id.tab);

/*

设置PagerTabStrip的一些属性

         */

        tab.setBackgroundColor(getResources().getColor(R.color.colorAccent));  //设置标题背景颜色

        tab.setTextColor(Color.WHITE);  //设置文字颜色

        tab.setDrawFullUnderline(false);   //去掉下划线

        tab.setTabIndicatorColor(Color.WHITE);  //设置选择线颜色

        MyFragmentAdapter adapter=new MyFragmentAdapter(getActivity().getSupportFragmentManager(),tablist,fraglist);

        viewPager.setAdapter(adapter);

        return view;

    }

}

FragmentFactory:

public class FragmentFactory {

    private static Fragment fragment;

    public static Fragment creatFragment(int checkedId)

    {

        switch (checkedId)

        {

            case R.id.rbt1:

               fragment=new ViewPagerFragment();

                break;

            case R.id.rbt2:

                fragment=new GirdViewFragment();

                break;

        }

        return fragment;

    }

}

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.myapplication.MainActivity">



  <RadioGroup

      android:layout_width="match_parent"

      android:layout_height="wrap_content"

      android:layout_alignParentBottom="true"

      android:orientation="horizontal"

      android:id="@+id/radiogroup">

    <RadioButton

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/rbt1"

        android:layout_weight="1"

        android:drawableTop="@drawable/radiobutton_home_selector"

        android:textColor="@drawable/radiobutoon_home_text_selector"

        android:layout_marginLeft="20dp"

        android:textSize="15sp"

        android:gravity="center"

        android:checked="true"

        android:text="@string/home"



        android:button="@null"/>





    <RadioButton

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/rbt2"

        android:layout_weight="1"

        android:drawableTop="@drawable/raidobutton_girdviw_selector"

        android:textColor="@drawable/radiobutton_girdview_text_selector"

        android:text="@string/girdview"

        android:button="@null"

        android:gravity="center"

        android:textSize="15sp"

        />



    <RadioButton

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/rbt3"

        android:layout_weight="1"

        android:drawableTop="@drawable/radionbutton_internet_selector"

        android:textColor="@drawable/radiobutton_internet_text_selector"

        android:text="@string/internet"

        android:button="@null"

        android:gravity="center"

        android:textSize="15sp"

        />



  </RadioGroup>



  <ImageView

      android:layout_width="match_parent"

      android:layout_height="2dp"

      android:id="@+id/imageView"

      android:background="@color/colorAccent"

      android:layout_above="@+id/radiogroup"

      android:layout_marginBottom="10dp"

      android:layout_centerHorizontal="true" />

  <LinearLayout

      android:layout_width="match_parent"

      android:layout_height="wrap_content"

      android:layout_above="@+id/imageView"

      android:id="@+id/Linear"

      android:layout_alignParentTop="true">



  </LinearLayout>



</RelativeLayout>