android tablayout fragment教學 @ 鏡花水月-什麼是真?什麼是假?

今天要來寫tablayout，我要寫出以下功能，如圖:

首先，先在案子中建立一個tabed activity

選擇action bar tabs:

執行完後，他就會出現基本的程式碼:

Mytab.java:

public class mytab extends AppCompatActivity {
    private SectionsPagerAdapter mSectionsPagerAdapter;

    private ViewPager mViewPager;

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
      
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);

        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_mytab, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
       
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
    public static class PlaceholderFragment extends Fragment {
       
        private static final String ARG_SECTION_NUMBER = "section_number";

        public PlaceholderFragment() {
        }

        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_mytab, 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;
        }
    }

    public class SectionsPagerAdapter extends FragmentPagerAdapter {
        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return PlaceholderFragment.newInstance(position + 1);
        }

        @Override
        public int getCount() {
            // Show 3 total pages.
            return 2;
        }
    }
}

這時建立一個 Frag1.java 和 frag_layout.xml

Frag1.java:

public class Frag1 extends Fragment {
    Button bt1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.frag1_layout, null);
        bt1= (Button)view.findViewById(R.id.bt1);
        bt1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                btlink(v);}
        });

        return view;
        //  return inflater.inflate(R.layout.frag1_layout, container, false);
    }
    public void btlink(View view)
    {
        Intent intent=new Intent(android.content.Intent.ACTION_VIEW);
        intent.setData(Uri.parse("http://akkyschool.com"));
        startActivity(intent);
    }

}

frag_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/bt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
</RelativeLayout>

以上frag.java和xml的程式再複製第二個(frag2)

這時，再到mytab.java改點東西，將Fragment getItem改成以下:

@Override
public Fragment getItem(int position) {
    Fragment fragment = null;
    switch (position) {
        case 0:
            fragment = new Frag1();
            break;

        case 1:
            fragment = new Frag2();
            break;

    }
    return fragment;
 //   return PlaceholderFragment.newInstance(position + 1);
}