Start an Activity from Custom Adapter in Android

Question

I am trying to start an Activity from my Custom Adapter for ListView in Android. I am declaring context but Logcat shows that Context not found. I am uploading my code here

    @Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // convert view = design
    View v = convertView;
    //context = this;

    if (v == null) {
        holder = new ViewHolder();
        holder = new ViewHolder();
        v = vi.inflate(Resource, null);
        holder.imageview = (ImageView) v.findViewById(R.id.ivImage);
        holder.tvName = (TextView) v.findViewById(R.id.tvName);
        holder.tvDescription = (TextView) v.findViewById(R.id.tvDescriptionn);
        holder.tvDOB = (TextView) v.findViewById(R.id.tvDateOfBirth);
        holder.tvCountry = (TextView) v.findViewById(R.id.tvCountry);
        holder.tvHeight = (TextView) v.findViewById(R.id.tvHeight);
        holder.tvSpouse = (TextView) v.findViewById(R.id.tvSpouse);
        holder.tvChildren = (TextView) v.findViewById(R.id.tvChildren);
        v.setTag(holder);
    } else {
        holder = (ViewHolder) v.getTag();
    }
    holder.imageview.setImageResource(R.mipmap.ic_launcher);
    new DownloadImageTask(holder.imageview).execute(actorList.get(position).getImage());
    holder.tvName.setText(actorList.get(position).getName());
    holder.tvDescription.setText(actorList.get(position).getDescription());
    holder.tvDOB.setText("B'day: " + actorList.get(position).getDob());
    holder.tvCountry.setText(actorList.get(position).getCountry());
    holder.tvHeight.setText("Height: " + actorList.get(position).getHeight());
    holder.tvSpouse.setText("Spouse: " + actorList.get(position).getSpouse());
    holder.tvChildren.setText("Children: " + actorList.get(position).getChildren());

    holder.tvName.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getContext(), actorList.get(position).getName(), Toast.LENGTH_SHORT).show();
            Context context = getContext();
            Intent i = new Intent(context, Details.class);
            context.startActivity(i);
        }
    });
    return v;

}

Here I want to start a new Activity against a Button's click event.

Here is my LogCat

06-25 14:25:15.237    3179-3179/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.scroll.owner.jsonparsing, PID: 3179
android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
        at android.app.ContextImpl.startActivity(ContextImpl.java:1421)
        at android.app.ContextImpl.startActivity(ContextImpl.java:1408)
        at android.content.ContextWrapper.startActivity(ContextWrapper.java:324)
        at com.scroll.owner.jsonparsing.ActorAdapter$1.onClick(ActorAdapter.java:76)
        at android.view.View.performClick(View.java:4881)
        at android.view.View$PerformClick.run(View.java:19592)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:146)
        at android.app.ActivityThread.main(ActivityThread.java:5756)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
        at dalvik.system.NativeStart.main(Native Method)

Can anyone suggest me a solution. Previously I have implemented this type of Starting Activity from a Java Class. But here the situation seems to me different. I am looking for your suggestion.

score 7 · Answer 1 · answered Jun 25 '15 at 08:44

7

This problem is because you are starting an activity from CustomArrayAdapter Class, so for doing this you have to add a line between

Intent i = new Intent(context, Details.class);

i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //add this line

context.startActivity(i);

And your code will work fine

answered Jun 25 '15 at 08:44

Adi Tiwari

761
1
5
17

yes I also did the same and it works for me, But I first saw Neal Ahluvalia answer, so I accepted that answer. As your answer is helpful one I have voted up it. Thank you – Jun 25 '15 at 08:53

Neal Ahluvalia · Accepted Answer · 2015-06-25T08:51:34.410

1

Use

Intent intent=new Intent(...).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
v.getContext().startActivity(i);

edited Jun 25 '15 at 08:51

answered Jun 25 '15 at 08:39

Neal Ahluvalia

1,538
1
10
20

1

No! it doesn't work for me. Logcat shows android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? – Jun 25 '15 at 08:42
YEah provide it with FLAG_ACTIVITY_NEW_TASK – Neal Ahluvalia Jun 25 '15 at 08:44
`Intent intent=new Intent(...).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);` – Neal Ahluvalia Jun 25 '15 at 08:46

score 0 · Answer 3 · answered Jun 25 '15 at 08:36

0

either use parent.getContext() or set context param in constructor of adapter while calling and use that refrence

answered Jun 25 '15 at 08:36

Amarjit

4,327
2
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score 0 · Answer 4 · edited May 23 '17 at 11:53

0

There are several types of contexts. The adapter is not launched with context from Activity (which is good), but only an activity`s context can lunch an other activity ! So in this case, you have to pass your activity to your adapter , and use it as a context to lunch a new one.

Please mind the link: What is 'Context' on Android?

edited May 23 '17 at 11:53

Community

1
1

answered Jun 25 '15 at 08:40

narancs

5,234
4
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score 0 · Answer 5 · answered Jun 25 '15 at 08:42

try something like this....

pass context reference from activty to the CustomAdapter class..

    public class CustomAdapter extends Adapter {
     private Context context;

     public CustomAdapter (Context context) {
          this.context = context;     
     }   

}

now you can use this context to launch the activty.

Start an Activity from Custom Adapter in Android

5 Answers5