ViewPager

先建一個帶底部菜單的

ViewPager切換 碎片

 

一、activity_main.xml

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager_a"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v4.view.ViewPager>

二、根據引導建立兩個Fragment

public class MainActivity extends AppCompatActivity implements BlankFragmentM.OnFragmentInteractionListener,PlusOneFragment.OnFragmentInteractionListener {

    private TextView mTextMessage;

    private ViewPager viewPager; private List<Fragment> fragmentList = new ArrayList<>(); private BlankFragmentM fragmentM; private PlusOneFragment fragmentN; private MyPagerAdapter adapter; private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.navigation_home:
                    mTextMessage.setText(R.string.title_home);
                viewPager.setCurrentItem(0);
                    return true;
                case R.id.navigation_dashboard:
                    mTextMessage.setText(R.string.title_dashboard);
                   viewPager.setCurrentItem(1);
                    return true;
                case R.id.navigation_notifications:
                    mTextMessage.setText(R.string.title_notifications);
       viewPager.setCurrentItem(0);
                    return true;
            }
            return false;
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextMessage = (TextView) findViewById(R.id.message);
        BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

 bindID(); fragmentM = new BlankFragmentM();
        fragmentN = new PlusOneFragment();
        //填充數據
        fragmentList.add(fragmentM);
        fragmentList.add(fragmentN);

 adapter = new MyPagerAdapter(getSupportFragmentManager(),fragmentList); viewPager.setAdapter(adapter);
        viewPager.setCurrentItem(0);

    }
    private void bindID() {
        viewPager = findViewById(R.id.viewpager_a); }

 @Override public void onFragmentInteraction(Uri uri) {

    }


    public class MyPagerAdapter extends FragmentPagerAdapter {

        private List<Fragment> mfragmentList;

        public MyPagerAdapter(FragmentManager fm, List<Fragment> fragmentList) {
            super(fm);
            this.mfragmentList = fragmentList;
        }

        @Override
        public Fragment getItem(int position) {
            return mfragmentList.get(position);
        }

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

}