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.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android: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;

    @Override
    public 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() {
            @Override
            public 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;
    }

    @Override
    public Fragment getItem(int position) {

        return fragmentList.get(position);
    }

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

    //注意！！！这里就是我们自定义的布局tab_item
    public 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;
    }
}
           

demo云盘链接：https://pan.baidu.com/s/1FWbP938mW0NB_92WJjHQQA

云盘密码交流：QQ1085220040

demo链接：https://download.csdn.net/download/meixi_android/11225062

资讯fragment实现及资讯频道管理：https://blog.csdn.net/meixi_android/article/details/90715243