ListFragment的用法

在ListActivity.class文件中

public class ListActivity extends AppCompatActivity {
    private SuiPian suiPian;
    private ShiPeiQi shiPeiQi;
    private ArrayList<String>arrayList;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listactivity);
        suiPian=SuiPian.getInstance();
        arrayList=new ArrayList<>();
        arrayList.add("第一个");
        arrayList.add("第二个");
        arrayList.add("第三个");
        shiPeiQi=new ShiPeiQi(arrayList);
        suiPian.setListAdapter(shiPeiQi);
        FragmentUtils.add(getSupportFragmentManager(),suiPian,R.id.f1);
    }
    class ShiPeiQi extends BaseAdapter{
        private ArrayList<String>arrayList;
        public ShiPeiQi(ArrayList<String>arrayList) {
            this.arrayList=arrayList;
        }

        @Override
        public int getCount() {
            return arrayList.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            TextView textView=new TextView(parent.getContext());
            textView.setText(arrayList.get(position));
            return textView;
        }
    }
}

在listactivity.xml文件中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/f1"
        android:layout_width="200dp"
        android:layout_height="match_parent">

    </FrameLayout>
    <FrameLayout
        android:id="@+id/f2"
        android:background="@color/colorPrimary"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>
</LinearLayout>

在SuiPian.java文件中

public class SuiPian extends ListFragment {
    private static SuiPian suiPian;
    private FirstFragment firstFragment;
    private SecondFragment secondFragment;
    private ThridFragment thridFragment;

    public static SuiPian getInstance() {
        if (suiPian == null) {
            suiPian = new SuiPian();
        }
        return suiPian;
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        Log.d("SuiPian", "position:" + position);
        switch (position) {
            case 0:
                if (FragmentUtils.findFragment(getFragmentManager(), SecondFragment.class) != null)
                    FragmentUtils.hide(secondFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), ThridFragment.class) != null)
                    FragmentUtils.hide(thridFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), FirstFragment.class) == null)
                    FragmentUtils.add(getFragmentManager(), firstFragment, R.id.f2);
                else
                    FragmentUtils.show(firstFragment);
                break;
            case 1:
                if (FragmentUtils.findFragment(getFragmentManager(), FirstFragment.class) != null)
                    FragmentUtils.hide(firstFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), ThridFragment.class) != null)
                    FragmentUtils.hide(thridFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), SecondFragment.class) == null)
                    FragmentUtils.add(getFragmentManager(), secondFragment, R.id.f2);
                else
                    FragmentUtils.show(secondFragment);
                break;
            case 2:
                if (FragmentUtils.findFragment(getFragmentManager(), SecondFragment.class) != null)
                    FragmentUtils.hide(secondFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), FirstFragment.class) != null)
                    FragmentUtils.hide(firstFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), ThridFragment.class) == null)
                    FragmentUtils.add(getFragmentManager(), thridFragment, R.id.f2);
                else
                    FragmentUtils.show(thridFragment);
                break;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.suipian, container, false);
        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        firstFragment = FirstFragment.getInstance();
        secondFragment = SecondFragment.getInstance();
        thridFragment = ThridFragment.getInstance();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }
}

在suipian.xml文件中，这个文件里面有注意点

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <ListView
        android:id="@android:id/list"//必须要加一个ListView，并且id必须是@android:id/list
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

在FirstFragment.java文件中

public class FirstFragment extends Fragment {
    private static FirstFragment firstFragment;
    public static FirstFragment getInstance(){
        if(firstFragment==null){
            firstFragment=new FirstFragment();
        }
        return firstFragment;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.first,container,false);
        return view;
    }
}

另外一种写法，效果和上面的一样，只是改动了两个文件中的内容

在ListActivity.java文件中

public class ListActivity extends AppCompatActivity {
    private SuiPian suiPian;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listactivity);
        suiPian=SuiPian.getInstance();
        FragmentUtils.add(getSupportFragmentManager(),suiPian,R.id.f1);
    }
}

在SuiPian.java文件中

public class SuiPian extends ListFragment {
    private static SuiPian suiPian;
    private FirstFragment firstFragment;
    private SecondFragment secondFragment;
    private ThridFragment thridFragment;
    private ShiPeiQi shiPeiQi;
    private ArrayList<String>arrayList;

    public static SuiPian getInstance() {
        if (suiPian == null) {
            suiPian = new SuiPian();
        }
        return suiPian;
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        Log.d("SuiPian", "position:" + position);
        switch (position) {
            case 0:
                if (FragmentUtils.findFragment(getFragmentManager(), SecondFragment.class) != null)
                    FragmentUtils.hide(secondFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), ThridFragment.class) != null)
                    FragmentUtils.hide(thridFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), FirstFragment.class) == null)
                    FragmentUtils.add(getFragmentManager(), firstFragment, R.id.f2);
                else
                    FragmentUtils.show(firstFragment);
                break;
            case 1:
                if (FragmentUtils.findFragment(getFragmentManager(), FirstFragment.class) != null)
                    FragmentUtils.hide(firstFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), ThridFragment.class) != null)
                    FragmentUtils.hide(thridFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), SecondFragment.class) == null)
                    FragmentUtils.add(getFragmentManager(), secondFragment, R.id.f2);
                else
                    FragmentUtils.show(secondFragment);
                break;
            case 2:
                if (FragmentUtils.findFragment(getFragmentManager(), SecondFragment.class) != null)
                    FragmentUtils.hide(secondFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), FirstFragment.class) != null)
                    FragmentUtils.hide(firstFragment);
                if (FragmentUtils.findFragment(getFragmentManager(), ThridFragment.class) == null)
                    FragmentUtils.add(getFragmentManager(), thridFragment, R.id.f2);
                else
                    FragmentUtils.show(thridFragment);
                break;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.suipian, container, false);
        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        firstFragment = FirstFragment.getInstance();
        secondFragment = SecondFragment.getInstance();
        thridFragment = ThridFragment.getInstance();
        arrayList=new ArrayList<>();
        arrayList.add("第一个");
        arrayList.add("第二个");
        arrayList.add("第三个");
        shiPeiQi=new ShiPeiQi(arrayList);
        setListAdapter(shiPeiQi);
        FragmentUtils.add(getFragmentManager(),firstFragment,R.id.f2);
    }
    class ShiPeiQi extends BaseAdapter {
        private ArrayList<String> arrayList;
        public ShiPeiQi(ArrayList<String>arrayList) {
            this.arrayList=arrayList;
        }

        @Override
        public int getCount() {
            return arrayList.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            TextView textView=new TextView(parent.getContext());
            textView.setText(arrayList.get(position));
            return textView;
        }
    }
}