無法從片段中啓動活動

Question

我在片段中有一個imageView。在imageView上點擊我想開始一個活動。下面是我的代碼，顯示空指針異常。

 public static class DemoObjectFragment extends Fragment { 
    // public static final String ARG_OBJECT = "object"; 
    Context con=getActivity(); 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_collection_object, container, false); 
     Bundle args = getArguments();       
     ImageView shadow_img=(ImageView) rootView.findViewById(R.id.shadow_img); 
     ImageView img=(ImageView)rootView.findViewById(R.id.img); 
     img.setOnClickListener(new OnClickListener(){ 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Intent intent = new Intent(getActivity(), Article.class); 

       getActivity().startActivity(intent); 
      } 
       }); 
     shadow_img.setImageResource(R.drawable.featured_shadow); 

     new ImageLoadTask(args.getString("img_url"),(ImageView)rootView.findViewById(R.id.img),con).execute(null, null); 
     return rootView; 
    } 
} 

Answer 1

此代碼運行良好，請嘗試litlle更改。

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 


     ViewGroup rootView = null; 
     rootView = (ViewGroup) inflater.inflate(R.layout.layname, container, false); 

     Button btnSec = (Button)rootView.findViewById(R.id.btnSec); 
     btnSec.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
      Intent iz = new Intent(getActivity(), SecondActivity.class); 
      startActivity(iz)