Question

I’ve seen applications that contain panel with tabs that don’t lead user to another activities. I guess, this is where TabHost + Fragment elements are used.

Could you give your assumptions/caveats/links on implementing this functionality ?

Answer 1

Use can make use of ViewPager.

First include the ViewPager in your layout (you can use the one in the compatibility package for old versions):

<?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" >

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</RelativeLayout>

To load several Fragments into a ViewPager, you have to implement a FragmentPagerAdapter:

public class MyPagerAdapter extends FragmentPagerAdapter {
    private Fragment fragment1;
    private Fragment fragment2;

    public ChartPagerAdapter(FragmentManager fm, Context context) {
        super(fm);
        fragment1 = new MyFragment();
        fragment2 = new MyFragment();
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return fragment1;
            case 1:
                return fragment2;

        }
    }

    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public String getPageTitle(int position) {
        switch (position) {
            case 0:
                return "Title 1";
            case 1:
                return "Title 2";
        }
    }
}

Then you set this adapter to the ViewPager:

    setContentView(R.layout.my_layout);

    MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager(), MyActivity.this);

    ViewPager pager = (ViewPager)findViewById(R.id.pager);
    pager.setAdapter(adapter);