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Calling functions inside fragments in Android

In my android Iam application using viewpager.I there are two snippets. Fragment1 and Fragment2.Iam calls two different functions for fragments.ie, 'function1' for Fragment1 and 'function2' for fragment2.When I run the application, both of these two functions are called together. I want to call "function1" at startup and "function2" only when I go to Fragment2.How can I do this? Thanks in advance.

Here is my code

Fragment1 =>

public class Fragment1 extends Fragment{ public static String feedurl="http://www.abcd.com/en/rssfeeds/1_2_3_5/latest/rss.xml"; static String URL = ""; static final String KEY_HEAD = "item"; // parent node static final String KEY_DATE = "pubDate"; public static String headflag=""; int f=0; GridView list; HeadlinesAdapter adapter; private TextView mMessageView; private Button mClearButton; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.first_fragment, container, false); return v; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); function1();//here I am calling function1 populate_listview(); } public void populate_listview() { URL="http://www.abcd.com/en/rssfeeds/1_2_3_5/latest/rss.xml"; ArrayList<HashMap<String, String>> newsList = new ArrayList<HashMap<String, String>>(); XMLParser parser = new XMLParser(); String xml = parser.getXmlFromUrl(URL); Document doc = parser.getDomElement(xml); NodeList nl = doc.getElementsByTagName(KEY_HEAD); NodeList itemLst = doc.getElementsByTagName("item"); String MarqueeStr=""; for (int i = 0; i < nl.getLength(); i++) { HashMap<String, String> map = new HashMap<String, String>(); Element e = (Element) nl.item(i); newsList.add(map); } list=(GridView)getActivity().findViewById(R.id.grid); adapter=new Adapter1(getActivity(), newsList); list.setAdapter(adapter); } }

FRAGMENT2 =>

  public class Fragment2 extends Fragment{ public static String feedurl="http://www.abcd.com/en/rssfeeds/1_2_3_5/latest/rss.xml"; static String URL = ""; static final String KEY_HEAD = "item"; // parent node static final String KEY_DATE = "pubDate"; public static String headflag=""; int f=0; GridView list; HeadlinesAdapter adapter; private TextView mMessageView; private Button mClearButton; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.second_fragment, container, false); return v; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); function2();//here I am calling function2 populate_listview(); } public void populate_listview() { URL="http://www.abcd.com/en/rssfeeds/1_2_3_5/latest/rss.xml"; ArrayList<HashMap<String, String>> newsList = new ArrayList<HashMap<String, String>>(); XMLParser parser = new XMLParser(); String xml = parser.getXmlFromUrl(URL); Document doc = parser.getDomElement(xml); NodeList nl = doc.getElementsByTagName(KEY_HEAD); NodeList itemLst = doc.getElementsByTagName("item"); String MarqueeStr=""; for (int i = 0; i < nl.getLength(); i++) { HashMap<String, String> map = new HashMap<String, String>(); Element e = (Element) nl.item(i); newsList.add(map); } list=(GridView)getActivity().findViewById(R.id.grid2); adapter=new HeadlinesAdapter(getActivity(), newsList); list.setAdapter(adapter); } }

Main activity =>

 public class MainActivity extends FragmentActivity { private ViewPager mViewPager; private MessageLoader mLoader; private Button mSenderButton, mReceiverButton; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // We get UI references mViewPager = (ViewPager) findViewById(R.id.viewPager); mSenderButton = (Button) findViewById(R.id.sender_button); mReceiverButton = (Button) findViewById(R.id.receiver_button); // set pager adapter mViewPager.setAdapter(new MyAdapter(this)); // set receiver button listener mReceiverButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { mViewPager.setCurrentItem(1); } }); mSenderButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { mViewPager.setCurrentItem(0); } }); } private class MyAdapter extends FragmentPagerAdapter{ private Context mContext; private String[] frags = {Fragment1.class.getName(), Fragment2.class.getName()}; public MyAdapter(FragmentActivity activity) { super(activity.getSupportFragmentManager()); mContext = activity; } @Override public Object instantiateItem(ViewGroup container, int position) { Fragment frag = (Fragment) super.instantiateItem(container, position); if(frag instanceof MessageLoader){ mLoader = (MessageLoader) frag; } return frag; } @Override public Fragment getItem(int pos) { return Fragment.instantiate(mContext, frags[pos]); } @Override public int getCount() { return frags.length; } } }

Here are the layouts,

first_fragment.xml =>

  <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffff" android:orientation="vertical" > <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" > </RelativeLayout> <GridView android:id="@+id/grid" android:layout_width="match_parent" android:layout_height="wrap_content" android:numColumns="2" > </GridView> </LinearLayout>

second_fragment.xml =>

  <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffff" android:orientation="vertical" > <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" > </RelativeLayout> <GridView android:id="@+id/grid2" android:layout_width="match_parent" android:layout_height="wrap_content" android:numColumns="2" > </GridView> </LinearLayout>

main.xml =>

  <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TableRow android:layout_width="match_parent" android:layout_height="50dp" android:background="#CCCCCC" android:gravity="center_vertical" android:paddingTop="3dp" > <Button android:id="@+id/receiver_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="Headlines" /> <Button android:id="@+id/sender_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="Kerala" /> </TableRow> <android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
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1 answer

You can capture a swipe event with this code:

 mViewPager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { if(position==0){ function1(); }else if(position==1){ function2(); } } @Override public void onPageScrollStateChanged(int state) { } });

call your function in any of the most appropriate overridden methods

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Source: https://habr.com/ru/post/1445927/

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