Start an activity from a fragment

Question

I have 2 fragments with on both fragments a button  When I press the button I d like to start a new Activity  But I can t get it to work   The error I m getting  ERROR here  Type mismatch  cannot convert from mFragmentFavorite to Fragment  What am I doing wrong   MyFragmentPagerAdapter  import android support v4 app Fragment  import android support v4 app FragmentManager  import android support v4 app FragmentPagerAdapter   public class MyFragmentPagerAdapter extends FragmentPagerAdapter       final int PAGE COUNT   3           Constructor of the class        public MyFragmentPagerAdapter FragmentManager fm            super fm                  This method will be invoked when a page is requested to create         Override     public Fragment getItem int arg0             switch arg0            case 0              return new FavoriteActivity                          ERROR  Type mismatch  cannot convert from FavoriteActivity to Fragment           case 1              return new SettingsActivity              default              return null                                   Returns the number of pages         Override     public int getCount             return PAGE COUNT            FavoriteActivity  import android app Activity  import android content Intent  import android os Bundle  import android view LayoutInflater  import android view View  import android view View OnClickListener  import android view ViewGroup  import android widget Button   public class FavoriteActivity extends Activity       public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            View v   inflater inflate R layout main favorite  container  false             OnClickListener listnr new OnClickListener                  Override             public void onClick View v                      Intent i  new Intent  aFavorite                      startActivity i                                       Button btn   Button  v findViewById R id mainFavorite             btn setOnClickListener listnr              return v            If FavoriteActivity extends fragments  the error is gone but then I get an error at findViewById R id mainFavorite   and the error is     The method findViewById int  is undefined for the type   FavoriteActivity   EDIT   When I press the button in the fragment to start the activity then the app crashes this is my logcat  03-18 16 01 23 985  E AndroidRuntime 1985   FATAL EXCEPTION  main 03-18 16 01 23 985  E AndroidRuntime 1985   android content ActivityNotFoundException  No Activity found to handle Intent   act FavoriteActivityList   03-18 16 01 23 985  E AndroidRuntime 1985       at android app Instrumentation checkStartActivityResult Instrumentation java 1569  03-18 16 01 23 985  E AndroidRuntime 1985       at android app Instrumentation execStartActivity Instrumentation java 1420  03-18 16 01 23 985  E AndroidRuntime 1985       at android app Activity startActivityForResult Activity java 3446  03-18 16 01 23 985  E AndroidRuntime 1985       at android app Activity startActivityForResult Activity java 3407  03-18 16 01 23 985  E AndroidRuntime 1985       at android support v4 app FragmentActivity startActivityFromFragment FragmentActivity java 826  03-18 16 01 23 985  E AndroidRuntime 1985       at android support v4 app Fragment startActivity Fragment java 838  03-18 16 01 23 985  E AndroidRuntime 1985       at com example spui FavoriteActivity 1 onClick FavoriteActivity java 24  03-18 16 01 23 985  E AndroidRuntime 1985       at android view View performClick View java 4211  03-18 16 01 23 985  E AndroidRuntime 1985       at android view View PerformClick run View java 17267  03-18 16 01 23 985  E AndroidRuntime 1985       at android os Handler handleCallback Handler java 615  03-18 16 01 23 985  E AndroidRuntime 1985       at android os Handler dispatchMessage Handler java 92  03-18 16 01 23 985  E AndroidRuntime 1985       at android os Looper loop Looper java 137  03-18 16 01 23 985  E AndroidRuntime 1985       at android app ActivityThread main ActivityThread java 4898  03-18 16 01 23 985  E AndroidRuntime 1985       at java lang reflect Method invokeNative Native Method  03-18 16 01 23 985  E AndroidRuntime 1985       at java lang reflect Method invoke Method java 511  03-18 16 01 23 985  E AndroidRuntime 1985       at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 1006  03-18 16 01 23 985  E AndroidRuntime 1985       at com android internal os ZygoteInit main ZygoteInit java 773  03-18 16 01 23 985  E AndroidRuntime 1985       at dalvik system NativeStart main Native Method

User · Accepted Answer

mFragmentFavorite in your code is a FragmentActivity which is not the same thing as a Fragment   That s why you re getting the type mismatch  Also  you should never call new on an Activity as that is not the proper way to start one   If you want to start a new instance of mFragmentFavorite  you can do so via an Intent   From a Fragment   Intent intent   new Intent getActivity    mFragmentFavorite class   startActivity intent     From an Activity  Intent intent   new Intent this  mFragmentFavorite class   startActivity intent     If you want to start aFavorite instead of mFragmentFavorite then you only need to change out their names in the created Intent   Also  I recommend changing your class names to be more accurate   Calling something mFragmentFavorite is improper in that it s not a Fragment at all   Also  class declarations in Java typically start with a capital letter   You d do well to name your class something like FavoriteActivity to be more accurate and conform to the language conventions   You will also need to rename the file to FavoriteActivity java if you choose to do this since Java requires class names match the file name   UPDATE  Also  it looks like you actually meant formFragmentFavorite to be a Fragment instead of a FragmentActivity based on your use of onCreateView   If you want mFragmentFavorite to be a Fragment then change the following line of code   public class mFragmentFavorite extends FragmentActivity    Make this instead read   public class mFragmentFavorite extends Fragment

User · Answer

If you are using getActivity   then you have to make sure that the calling activity is added already  If activity has not been added in such case so you may get null when you call getActivity     in such cases getContext   is safe  then the code for starting the activity will be slightly changed like    Intent intent   new Intent getContext    mFragmentFavorite class   startActivity intent     Activity  Service and Application extends ContextWrapper class so you can use this or getContext   or getApplicationContext   in the place of first argument

User · Answer

I use this in my fragment   Button btn1    Button  thisLayout              findViewById R id btnDb1        btn1 setOnClickListener new OnClickListener               Override         public void onClick View v                   TODO Auto-generated method stub             Intent intent   new Intent getActivity    otherActivity class                 MainActivity  getActivity    startActivity intent                           return thisLayout

User · Answer

Start new Activity From a Fragment   Intent intent   new Intent getActivity    TargetActivity class   startActivity intent     Start new Activity From a Activity   Intent intent   new Intent this  TargetActivity class   startActivity intent

User · Answer

You may have to replace getActivity   with MainActivity this for those that are having issues with this

User · Answer

with Kotlin I execute this code   requireContext   startActivity lt YourTargetActivity gt

User · Answer

You should use getActivity   to launch activities from fragments  Intent intent   new Intent getActivity    mFragmentFavorite class   startActivity intent     Also  you should be naming classes with caps  MFragmentActivity instead of mFragmentActivity

[android] Start an activity from a fragment

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