How to start an activity by click of image button

问题:

i have a list there is a image button in each item when i click on a image i have to start another Activity with intent

following are my code

my problem is i couldn't call startActivity() from custom adapter! !

in custom adapter's getView()

  holder.profilePicture.setOnClickListener(new OnClickListener() 
       { 
           public void onClick(View v) 
           {
               Log.d("OnImageButton","Clicked");
               Intent zoom=new Intent(AllProfile.getAppContext(), ImageZoom.class);
               int imageID=holder.profilePicture.getId();
               zoom.putExtra("ImageId", imageID);
               startActivity(zoom)  ; //This line raises error !      
                           }


       });

回答1:

You should pass your context to your custom adapter when you create it:

public class MyAdapter extends BaseAdapter {
    private Context mContext;

    public MyAdapter (Context ctx) {
        mContext = ctx;
    }

    ...
}

And in getView use that context to start the Activity:

 holder.profilePicture.setOnClickListener(new OnClickListener() 
   { 
       public void onClick(View v) 
       {
           Log.d("OnImageButton","Clicked");
           Intent zoom=new Intent(mContext, ImageZoom.class);
           int imageID=holder.profilePicture.getId();
           zoom.putExtra("ImageId", imageID);
           mContext.startActivity(zoom)  ; //This line raises error !      
                       }


   });

When you create the Adapter in your Activity you should pass "this" as a parameter:

 mAdapter = new MyAdapter(this);

回答2:

have you tried this:

MainActivity.this.startActivity(zoom);