spaceengineer spaceengineer - 1 month ago 22
Java Question

How to create a Tabbed Activity with ListViews - Android

First of all, I'm a beginner in Android programming. What I'm trying to do is to program three Tabs with each a ListView inside (you know it from e.g. WhatsApp). Android Studio makes it easy to automatically create a Tabbed Activity. So the question is: how can I implement a ListView for each Tab?
Actually there is a nice tutorial on http://www.androidhive.info/2012/05/android-combining-tab-layout-and-list-view/ which uses TabActivity. However this method is deprecated and Fragments should be used instead. I have extended main_fragment.xml (which was created by Android Studio) with a ListView. But what is the correct way to set the corresponding list adapters and especially where to set them? Setting them like

ListView list_all = (ListView) findViewById(R.id.listViewAll)
in
onCreate()
does not work because of a null object reference error. Also I didn't find out how to use the
rootView
which is returned by
onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState)
So how can I solve this problem?

main_fragment.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:background="@color/colorAccent"
android:paddingTop="@dimen/activity_vertical_margin">

<ListView
android:id="@+id/listViewAll"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>

</RelativeLayout>


main.xml:

<?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.CoordinatorLayout 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"
android:fitsSystemWindows="true"
android:background="@color/white"

tools:context="de.url.members">

<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/appbar_padding_top"
android:background="@color/bg_login_dark"
android:theme="@style/AppTheme.AppBarOverlay">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/bg_login_dark"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay">

</android.support.v7.widget.Toolbar>

<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
app:tabMode="fixed"
android:fillViewport="false" />

</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>


main.java:

public class main extends AppCompatActivity {

/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;


// The {@link ViewPager} that will host the section contents.
private ViewPager mViewPager;


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


Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);

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

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// action here
}
});
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_members, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.logout) {
//action here
}

return super.onOptionsItemSelected(item);
}


/**
* 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) {

int sectionNumber = getArguments().getInt(ARG_SECTION_NUMBER);//INDEX of selected TAB
View rootView;

if (sectionNumber == 1){
rootView = inflater.inflate(R.layout.main_fragment, container, false);
}else if (sectionNumber == 2){
rootView = inflater.inflate(R.layout.main_fragment, container, false);
}else if (sectionNumber == 3){
rootView = inflater.inflate(R.layout.main_fragment, container, false);
}else{
rootView = inflater.inflate(R.layout.main_fragment, container, false);

}

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 3;
}

@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getResources().getString(R.string.title_section1);
case 1:
return getResources().getString(R.string.title_section2);
case 2:
return getResources().getString(R.string.title_section3);
}
return null;
}
}
}

Answer

If you want to use Listing with tablayout and viewpager try this way it will work for you

public class MainActivity extends AppCompatActivity {
    private static Toolbar toolbar;
    private static ViewPager viewPager;
    private static TabLayout tabLayout;

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

        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        viewPager = (ViewPager) findViewById(R.id.viewPager);
        setupViewPager(viewPager);

        tabLayout = (TabLayout) findViewById(R.id.tabLayout);
        tabLayout.setupWithViewPager(viewPager);//setting tab over viewpager

        //Implementing tab selected listener over tablayout
        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());//setting current selected item over viewpager
                switch (tab.getPosition()) {
                    case 0:
                        Log.e("TAG","TAB1");
                        break;
                    case 1:
                        Log.e("TAG","TAB2");
                        break;
                    case 2:
                        Log.e("TAG","TAB3");
                        break;
                }
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {
            }
        });
    }


    //Setting View Pager
    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFrag(new DummyFragment("ANDROID"), "ANDROID");
        adapter.addFrag(new DummyFragment("iOS"), "iOS");
        adapter.addFrag(new DummyFragment("WINDOWS"), "WINDOWS");
        viewPager.setAdapter(adapter);
    }


    //View Pager fragments setting adapter class
    class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();//fragment arraylist
        private final List<String> mFragmentTitleList = new ArrayList<>();//title arraylist

        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

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

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


        //adding fragments and title method
        public void addFrag(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }
    }
}

For more see android-material-design-tabs-using-tablayout

OR

Check this http://www.tutorialsbuzz.com/2015/10/Android-Sliding-TabLayout-ListView-WhatsApp.html

And check this https://github.com/codepath/android_guides/wiki/Handling-Scrolls-with-CoordinatorLayout

OUTPUT

enter image description here

Comments