Databases
StackOverflow2013
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PO
 

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  1. PO
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    <p>There are so many problems with that code. Here, let me fix that for you. The following is untested, just edited in my favourite text editor.</p> <pre><code>public class TitleAdapter extends FragmentPagerAdapter { public final String titles[] = new String[] { "A", "B", "C" }; public final Fragment frags[] = new Fragment[titles.length]; public TitleAdapter(FragmentManager fm) { super(fm); // do not commit any fragments here, the adapter handles that. frags[0] = new FragmentA(); frags[1] = new FragmentB(); frags[2] = new FragmentC(); } @Override public CharSequence getPageTitle(int position) { Log.v("TitleAdapter - getPageTitle=", titles[position]); return titles[position]; } @Override public Fragment getItem(int position) { Log.v("TitleAdapter - getItem=", String.valueOf(position)); return frags[position]; } @Override public int getCount() { return frags.length; } } </code></pre> <p>Then in the activity:</p> <pre><code>public class MainActivity extends FragmentActivity { TitleAdapter titleAdapter; ViewPager mViewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mViewPager = (ViewPager) findViewById(R.id.pager); final TitleAdapter titleAdapter = new TitleAdapter(getSupportFragmentManager()); mViewPager.setAdapter(titleAdapter); mViewPager.setCurrentItem(1); mViewPager.setOffscreenPageLimit(2); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { Fragment fragment = titleAdapter.getItem(position); // Ideally use some sort of interface here. if (fragment instanceof FragmentA) { ((FragmentA) fragment).bgStop(); } } }); } } </code></pre>
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    1. PONullPointerException a call tag fragment ViewPager
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    1. USLasse Magnussen
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    1. COit works, thanks, but got out the next problem, I put it on and pressing the button after clicking when browsing fragment falls error java.lang.NullPointerException pointing to this code Fragment fragment = titleAdapter.getItem(position); how can I fix it? or you offered "Ideally use some sort of interface here." how to do it?
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      1. USuser3064772
    2. CONot really sure what you're trying to achieve here, but what I ment about interfaces was that your fragments should `implements MyCommonFragmentInterface` which is an interface which has some methods which are common between the three interfaces.
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      1. USLasse Magnussen
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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