How to start Activity in adapter

Question

I have a ListActivity with my customized adapter and inside each of the view  it may have some buttons  in which I need to implement OnClickListener  I need to implement the OnClickListener in the adapter  However  I don t know how to call the function like startActivity   or setResult    Since the adapter doesn t extend to Activity    So what is the best way to solve this problem    Thanks

User · Answer

Simple way to start activity in Adopter s button onClickListener   Intent myIntent   new Intent view getContext   Event Member list class                      myIntent putExtra  intVariableName   eventsList get position  getEvent id                     view getContext   startActivity myIntent

User · Answer

Just pass in the current Context to the Adapter constructor and store it as a field  Then inside the onClick you can use that context to call startActivity     pseudo-code  public class MyAdapter extends Adapter        private Context context        public MyAdapter Context context              this context   context                    public View getView                View v           v setOnClickListener new OnClickListener                  void onClick                      context startActivity

User · Answer

callback from adapter to activity can be done using registering listener in form of interface   Make an interface         public MyInterface           public void  yourmethod   incase needs parameters                 In Adapter Let s Say MyAdapter       public MyAdapter extends BaseAdapter         private MyInterface listener       MyAdapter Context context           try               this  listener      MyInterface   context                   catch  ClassCastException e                   throw new ClassCastException  Activity must implement MyInterface                    do this  where u need to fire listener           l            try                   listener   yourmethod                   catch  ClassCastException exception                      do something                      In Activity Implement your method             MyActivity extends AppCompatActivity implements MyInterface                   yourmethod                      do whatever you want

User · Answer

public class MyAdapter extends Adapter        private Context context               public MyAdapter Context context              this context   context                         public View getView                  View v             v setOnClickListener new OnClickListener                  void onClick                       Intent intent  new Intent context  ToActivity class                       intent putExtra  your extra   your class value                     context startActivity intent

User · Answer

When implementing the onClickListener  you can use v getContext startActivity   btn setOnClickListener new OnClickListener                            Override     public void onClick View v            v getContext   startActivity PUT YOUR INTENT HERE

User · Answer

For newer versions of sdk you have to set flag activity task   public void onClick View v          Intent myactivity   new Intent context getApplicationContext    OtherActivity class        myactivity addFlags FLAG ACTIVITY NEW TASK        context getApplicationContext   startActivity myactivity

User · Answer

If you want to redirect on url instead of activity from your adapter class  then pass context of with startactivity   btnInstall setOnClickListener new View OnClickListener                  Override             public void onClick View v                    Intent intent new Intent Intent ACTION VIEW  Uri parse link                    intent setData Uri parse link                    context startActivity intent

User · Answer

First Solution   You can call start activity inside your adapter like this   public class YourAdapter extends Adapter        private Context context        public YourAdapter Context context              this context   context                    public View getView                View v           v setOnClickListener new OnClickListener                  void onClick                      context startActivity                                              Second Solution   You can call onClickListener of your button out of the YourAdapter class  Follow these steps   Craete an interface like this   public YourInterface           public void  yourMethod args          Then inside your adapter       public YourAdapter extends BaseAdapter                 private YourInterface listener              public YourAdapter  Context context  YourInterface listener                       this listener   listener                      this context   context                           public View getView                       View v           v setOnClickListener new OnClickListener                  void onClick                      listener yourMethod args                                   And where you initiate yourAdapter will be like this   YourAdapter adapter   new YourAdapter getContext     args  - gt                startActivity                     This link can be useful for you

[java] How to start Activity in adapter?

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