Activity嵌套fragment大全，activity加载单个fragment，TabLayout+ViewPager实现多个fragment滑动效果

加载单个fragment效果头部标题多个fragment

底部标题按钮多个fragment 底部标题按钮多个fragment

FragmentPagerAdapter实现，会重复onCreateView          FragmentManager实现。不会重复onCreateView

itemview按钮，viewpager加载fragment 固定按钮，FrameLayout加载fragment

实现方法：

1、加载单个fragment

framelayout加载fragment

1、activity的layout文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"android:layout_height="match_parent"><FrameLayoutandroid:id="@+id/onef"android:layout_width="match_parent"android:layout_height="match_parent"></FrameLayout></android.support.constraint.ConstraintLayout>/3

2、创建fragment

public class Fragment1 extends Fragment {public static Fragment1 getInstance(Bundle bundle) {Fragment1 fg = new Fragment1();fg.setArguments(bundle);return fg;}protected View contentView;@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {contentView = inflater.inflate(R.layout.fragment1, container, false);initViews();return contentView;}public void initViews(){TextView textView =(TextView)contentView.findViewById(R.id.f1te);textView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Toast.makeText(getContext(),"ssssf1",Toast.LENGTH_SHORT).show();}});}}

3、加载fragment

public void switchContent() {//必需继承FragmentActivity,嵌套fragment只需要这行代码getSupportFragmentManager().beginTransaction().replace(R.id.onef, new Fragment2()).commitAllowingStateLoss();
}

同一布局，显示不同fragment内容

private GridDemoFragment f_a;
private ListDemoFragment f_b;
private Fragment[] mFragments;
private int mIndex;

//方法一，默认第一fragment
private void initFragment() {f_a = new GridDemoFragment();f_b = new ListDemoFragment();//添加到数组mFragments = new Fragment[]{f_a, f_b};//开启事务FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction ft = fragmentManager.beginTransaction();//添加首页ft.add(R.id.content, f_a).commit();//默认设置为第0个setIndexSelected(0);
}

//方法一，选中显示与隐藏
private void setIndexSelected(int index) {if (mIndex == index) {return;}FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction ft = fragmentManager.beginTransaction();//隐藏ft.hide(mFragments[mIndex]);//判断是否添加if (!mFragments[index].isAdded()) {ft.add(R.id.content, mFragments[index]).show(mFragments[index]);} else {ft.show(mFragments[index]);}ft.commit();//再次赋值mIndex = index;}

//方法二，选中替换
private void setIndexSelectedTwo(int index) {switch (index) {case 0:changeFragment(new GridDemoFragment().getFragmentGridDemoFragment());break;case 1:changeFragment(new ListDemoFragment().getFragmentListDemoFragment());break;default:break;}
}方法二，默认第一fragment
private void changeFragment(Fragment fm) {FragmentManager supportFragmentManager = getSupportFragmentManager();FragmentTransaction transaction = supportFragmentManager.beginTransaction();transaction.replace(R.id.content, fm);transaction.commit();
}

// 单例(方法二)
private static GridDemoFragment fa;
public static GridDemoFragment getFragmentGridDemoFragment() {if (fa == null) {fa = new GridDemoFragment();}return fa;
}

2、FragmentManager实现framelayout加载多个fragment

private Fragment mCurrentFragment;
private FragmentManager fragmentManager;
private SparseArray<Fragment> mainFragments;

mainFragments = new SparseArray<>();
fragmentManager = getSupportFragmentManager();
switchFragment(R.id.rl_home);

public void switchFragment(int resId) {Fragment fg;if (mainFragments.indexOfKey(resId) > -1) {fg = mainFragments.get(resId);} else {switch (resId) {case R.id.rl_home:mainFragments.put(resId, Fragment1.getInstance(null));break;case R.id.rl_lishi:mainFragments.put(resId, Fragment2.getInstance(null));break;case R.id.rl_me:mainFragments.put(resId, Fragment3.getInstance(null));break;}fg = mainFragments.get(resId);}switchContent(fg);
}/*** 切换数据*/
private void switchContent(Fragment fg) {if (fg == null || mCurrentFragment == fg)return;if (mCurrentFragment != null && mCurrentFragment != fg)getSupportFragmentManager().beginTransaction().hide(mCurrentFragment).commitAllowingStateLoss();mCurrentFragment = fg;
、、、、、、、、、、
}

3、FragmentPagerAdapter实现viewpager加载多个fragment

public class MyFragmentAdapter extends FragmentPagerAdapter {private List<Fragment> fragmentList;private List<String> titleList;private Context context;public MyFragmentAdapter(FragmentManager fragmentManager, List<Fragment> fragmentList, List<String> titleList,Context context) {super(fragmentManager);this.fragmentList = fragmentList;this.titleList = titleList;this.context = context;}@Overridepublic Fragment getItem(int position) {return fragmentList.get(position);}@Overridepublic int getCount() {return titleList.size();}//注意！！！这里就是我们自定义的布局tab_itempublic View getCustomView(int position){View view= LayoutInflater.from(context).inflate(R.layout.tab_item,null);ImageView iv= (ImageView) view.findViewById(R.id.tab_iv);TextView tv= (TextView) view.findViewById(R.id.tab_tv);switch (position){case 0://drawable代码在文章最后贴出iv.setImageDrawable(context.getResources().getDrawable(R.drawable.home_icon_selector));tv.setText("首页");break;case 1:iv.setImageDrawable(context.getResources().getDrawable(R.drawable.txl_icon_selector));tv.setText("通讯录");break;case 2:iv.setImageDrawable(context.getResources().getDrawable(R.drawable.wd_icon_selector));tv.setText("我的");break;}return view;}
}