在activity中更新fragment中的界面

MainActivty

1. 添加fragment

for (int i = 0; i < 6; i++) {            mList.add(MyFragment.newInstence(i));        }        FragmentManager supportFragmentManager = getSupportFragmentManager();        adapter = new MyViewpagerAdapter(supportFragmentManager, mList);        viewpager.setOffscreenPageLimit(10);        viewpager.setAdapter(adapter);

1. MyViewpagerAdapter.java

public class MyViewpagerAdapter extends FragmentStatePagerAdapter {    private ArrayList<MyFragment> mList_fragment;    public MyViewpagerAdapter(FragmentManager fm, ArrayList<MyFragment> mList_fragment) {        super(fm);        this.mList_fragment = mList_fragment;    }    public MyViewpagerAdapter(FragmentManager fm) {        super(fm);    }    @Override    public Fragment getItem(int position) {        return mList_fragment.get(position);    }    @Override    public int getCount() {        return mList_fragment.size();    }    @Override    public int getItemPosition(Object object) {        return PagerAdapter.POSITION_NONE;    }}

Fragment

• 传入数据

public static MyFragment newInstence(int index) {        MyFragment fragment = new MyFragment();        Bundle bundle = new Bundle();        bundle.putInt("index", index);        fragment.setArguments(bundle);        return fragment;    }    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mContext = getContext();        index = getArguments().getInt("index");        setStr(index + "");    }

操作数据改变界面

以下操作均在activity中

• 设置当前显示页
  viewpager.setCurrentItem(3)

• 修改当前页的内容
  int currentItem = viewpager.getCurrentItem();
  mList.get(currentItem).setTextContext(“这是什么？”);

• 删除当前页
  int currentItem = viewpager.getCurrentItem();
  mList.remove(currentItem);
  adapter.notifyDataSetChanged();

• 添加页
  mList.add(MyFragment.newInstence(mList.size()));
  adapter.notifyDataSetChanged();
  viewpager.setCurrentItem(0);