TabLayout、ViewPager與Fragment
阿新 • • 發佈：2018-12-04
1、前言：TabLayout是一種比較常見的佈局控制元件，在很多地方我們經常能看到一些類似於指示器的東西，在這裡，通過與ViewPager的結合來構建一個Android介面的基本框架，FragmentPagerAdapter 來 適配我們的ViewPager與Fragment。此次實踐進行了對Tablayout與ViewPager巢狀。
2、佈局：
第一層TabLayout的佈局xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 這裡為了讓ViewPager不能滑動，所以採用新建一個NoScrollViewPager繼承ViewPager的方法，重寫onTouchEvent、onInterceptTouchEvent方法如下：
/**
* Created by Administrator on 2017/5/31.
* 禁止ViewPager的滑動
*
* ViewPager非常好用，但有時候需要在ViewPager的裡面再嵌入ViewPager，那麼就有衝突了，簡單粗暴的方法就是直接把一個ViewPager禁止滑動。
注意：禁止滑動的同時不能禁止 setCurrentItem 方法。
實現思路：重寫ViewPager，覆蓋 onTouchEvent 和 onInterceptTouchEvent 方法，使其返回false，這樣就等於禁止了ViewPager上的滑動事件。
*/
public class NoScrollViewPager extends ViewPager {
public NoScrollViewPager(Context context) {
super(context);
}
public NoScrollViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onTouchEvent(MotionEvent arg0) {
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent arg0) {
return false;
}
}
第一層TabLayout與NoScrollViewPager 的使用：
public class StartActivity extends AppCompatActivity {
private String[] mTitles = {"Home","Mine"};
private ArrayList<Fragment> mFragments = new ArrayList<>();
private NoScrollViewPager mViewPager;
private TabLayout tabLayout;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
initViews();
addFragments();
setmViewPager();
}
private void setmViewPager(){
TabAdapter tabAdapter = new TabAdapter(getSupportFragmentManager(),mFragments,mTitles);
mViewPager.setAdapter(tabAdapter);
tabLayout.setTabTextColors(getResources().getColor(R.color.colorAccent), getResources().getColor(R.color.colorPrimary));//設定文字在選中和為選中時候的顏色
tabLayout.setupWithViewPager(mViewPager);
}
private void addFragments(){
mFragments.add(new MainFragment());
mFragments.add(MineFragment.newInstance(1));
}
private void initViews(){
mViewPager = (NoScrollViewPager) findViewById(R.id.viewPager);
tabLayout = (TabLayout)findViewById(R.id.table);
}
}TabAdapter對Fragement進行適配和載入：
public class TabAdapter extends FragmentPagerAdapter {
private List<Fragment> mFragments;
private String[] mTitles;
public TabAdapter(FragmentManager fm, ArrayList<Fragment> fragments,String[] titles){
super(fm);
mFragments = fragments;
mTitles = titles;
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
@Override
public CharSequence getPageTitle(int position) {
return mTitles[position];
}
}第二層TabLayout與ViewPager的佈局xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.indicator.MainFragment">
<android.support.design.widget.TabLayout
android:background="@color/colorPrimary"
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="30dp">
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:layout_below="@id/tab_layout"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>在MainFragment嵌套了第二層TabLayout
public class MainFragment extends Fragment {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
View v = inflater.inflate(R.layout.main_frag,null);
mViewPager = (ViewPager) v.findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) v.findViewById(R.id.tab_layout);
// ShapeIndicatorView shapeIndicatorView = (ShapeIndicatorView) v.findViewById(R.id.custom_indicator);
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
tabLayout.setupWithViewPager(mViewPager);
// shapeIndicatorView.setupWithTabLayout(tabLayout);
// shapeIndicatorView.setupWithViewPager(mViewPager);
return v;
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 7;
}
@Override
public CharSequence getPageTitle(int position) {
return "SECTION " + position;
}
}
}
最後我們實現的效果就是：
