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Ive asked a similar question before and didn't get an answer and seems many other ppl are searching for an answer. So I am posting this question to hopefully get a clear answer that everyone can benefit from. I have an activity with 2 fragments in it. I want fragment2 to set a boolean variable in Activity when a checkbox is checked so that fragment1 can know if the checkbox was checked. This is my Code: Activity: public class modestab extends Activity{ public static Context appContext; public boolean lf=false; public void onCreate(Bundle savedInstanceState){ appContext=this; super.onCreate(savedInstanceState); ActionBar tabbar= getActionBar(); tabbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); ActionBar.Tab ModesTab =tabbar.newTab().setText("Modes"); ActionBar.Tab CatTab =tabbar.newTab().setText("Categories"); Fragment ModesFragment =new modes(); Fragment CatFragment =new cats(); ModesTab.setTabListener(new MyTabsListener(ModesFragment)); CattTab.setTabListener(new MyTabsListener(CatFragment)); tabbar.addTab(ModesTab); tabbar.addTab(CatTab); } Fragment 1:(Where I want to read the boolean lf set in Acitivity above: @TargetApi(11) public class tabmodes extends Fragment{ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View V=inflater.inflate(R.layout.tab_modes, container, false); button1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub if(lf==false) //lf here is the lf in Activity which I want to get Fragment 2: Where I want to set lf in Activity ..... lifecheck.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ @Overri

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