error with intent android eclipse

Question

my mainactivity.java looks now like this :

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class FirstTabFragment extends Fragment {


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    final View v = inflater.inflate(R.layout.main, null);
    final View button = v.findViewById(R.id.button2);
    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            onlogin(v);
        }
    });
    return v;
}

public void onlogin(View button) {
    final Context context = getActivity().getApplicationContext();
    final Intent intent = new Intent(context, user.class);
    context.startActivity(intent);
}


    }

and my application is still crushing when i click on the button :S

LogCat :

04-30 20:18:50.520: E/AndroidRuntime(17203): FATAL EXCEPTION: main 04-30 20:18:50.520: E/AndroidRuntime(17203): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.app.ContextImpl.startActivity(ContextImpl.java:1095) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.content.ContextWrapper.startActivity(ContextWrapper.java:276) 04-30 20:18:50.520: E/AndroidRuntime(17203): at com.example.bloodneeded.FirstTabFragment.onlogin(FirstTabFragment.java:37) 04-30 20:18:50.520: E/AndroidRuntime(17203): at com.example.bloodneeded.FirstTabFragment$1.onClick(FirstTabFragment.java:28) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.view.View.performClick(View.java:3549) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.view.View$PerformClick.run(View.java:14400) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.os.Handler.handleCallback(Handler.java:605) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.os.Handler.dispatchMessage(Handler.java:92) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.os.Looper.loop(Looper.java:154) 04-30 20:18:50.520: E/AndroidRuntime(17203): at android.app.ActivityThread.main(ActivityThread.java:4944) 04-30 20:18:50.520: E/AndroidRuntime(17203): at java.lang.reflect.Method.invokeNative(Native Method) 04-30 20:18:50.520: E/AndroidRuntime(17203): at java.lang.reflect.Method.invoke(Method.java:511) 04-30 20:18:50.520: E/AndroidRuntime(17203): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-30 20:18:50.520: E/AndroidRuntime(17203): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-30 20:18:50.520: E/AndroidRuntime(17203): at dalvik.system.NativeStart.main(Native Method)

Answer 1

I think you don't get the point what "this" really means. The setClass takes two paremeters - the Context and the Class. If you do this in an Activity, you specify "this" because the Activity extends Context (another words, and Activity is a Context). The Fragment is not a Context so you get this error. The Context can also be obtained in a different way. The startActivity method is also a Context method. And also it is less code to set the ComponentName from the constructor if an intent.

public void onlogin(View button) {
    final Context context = getActvity();
    final Intent intent = new Intent(context, user.class);
    context.startActivity(intent);
}

Don't name classes with lower case letters. The class names should start with upper case letter. It's not an error, but rather a convention.

And about the getView method

return (RelativeLayout) inflater.inflate(R.layout.main, container,false);

There is absolutely no need to cast this to a Relativelayout. Just return the

return inflater.inflate(R.layout.main, container,false);

About

if (container == null) {
    return null;
}

Not sure what it means, but mostly

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    return inflater.inflate(R.layout.main, null);
}

must be fine

Also it crashes because

public void onlogin(View button) {
    final Context context = getActvity();
    final Intent intent = new Intent(context, user.class);
    context.startActivity(intent);
}

Must be defined in the context to which this View is attached.

This means that in order to work it must be defined in the Activity, not in Fragment. You have two ways of solving this 1) put this method in your Activity

2) If you want to define it in the Fragment, you should remove

android:onclick

from xml, set the button id

android:id="@+id/yourButtonId"

and set the onClickListener directly on the button.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    final View v = inflater.inflate(R.layout.main, null);
    final View button = v.findViewById(R.id.yourButtonId);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            onlogin(v);
        }
    });
    return v;
}

Answer 2

As you are in the Fragment, you should getActivity() instead of this Try this

 intent.setClass(getActivity(), user.class); 

Edit: also include this

  getActivity().startActivity(intent);

Answer 3

try intent.setClass(FirstTabFragment.this, user.class);