加載單個fragment效果? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 頭部標題多個fragment

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?底部標題按鈕多個fragment? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?底部標題按鈕多個fragment

FragmentPagerAdapter實現，會重復onCreateView FragmentManager實現。不會重復onCreateView

itemview按鈕，viewpager加載fragment? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 固定按鈕，FrameLayout加載fragment

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?實現方法：

1、加載單個fragment

framelayout加載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、創建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、加載fragment

public void switchContent() {//必需繼承FragmentActivity,嵌套fragment只需要這行代碼getSupportFragmentManager().beginTransaction().replace(R.id.onef, new Fragment2()).commitAllowingStateLoss(); }

同一布局，顯示不同fragment內容

private GridDemoFragment f_a; private ListDemoFragment f_b; private Fragment[] mFragments; private int mIndex; //方法一，默認第一fragment private void initFragment() {f_a = new GridDemoFragment();f_b = new ListDemoFragment();//添加到數組mFragments = new Fragment[]{f_a, f_b};//開啟事務FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction ft = fragmentManager.beginTransaction();//添加首頁ft.add(R.id.content, f_a).commit();//默認設置為第0個setIndexSelected(0); } //方法一，選中顯示與隱藏 private void setIndexSelected(int index) {if (mIndex == index) {return;}FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction ft = fragmentManager.beginTransaction();//隱藏ft.hide(mFragments[mIndex]);//判斷是否添加if (!mFragments[index].isAdded()) {ft.add(R.id.content, mFragments[index]).show(mFragments[index]);} else {ft.show(mFragments[index]);}ft.commit();//再次賦值mIndex = index;}

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//方法二，選中替換 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，默認第一fragment private void changeFragment(Fragment fm) {FragmentManager supportFragmentManager = getSupportFragmentManager();FragmentTransaction transaction = supportFragmentManager.beginTransaction();transaction.replace(R.id.content, fm);transaction.commit(); }

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

2、FragmentManager實現framelayout加載多個fragment

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

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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); }/*** 切換數據*/ 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實現viewpager加載多個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！！！這里就是我們自定義的布局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代碼在文章最后貼出iv.setImageDrawable(context.getResources().getDrawable(R.drawable.home_icon_selector));tv.setText("首頁");break;case 1:iv.setImageDrawable(context.getResources().getDrawable(R.drawable.txl_icon_selector));tv.setText("通訊錄");break;case 2:iv.setImageDrawable(context.getResources().getDrawable(R.drawable.wd_icon_selector));tv.setText("我的");break;}return view;} }

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demo云盤鏈接：https://pan.baidu.com/s/1FWbP938mW0NB_92WJjHQQA

云盤密碼交流：QQ1085220040

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

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資訊fragment實現及資訊頻道管理：https://blog.csdn.net/meixi_android/article/details/90715243

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