不是从MainActivity文件启动新的Activity

Question

I need to open new activity (using fragments if it's important) and I'm on a different file then the main activity so the code :

Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class);
CurrentActivity.this.startActivity(myIntent);

Is not good enough for me because I'm getting :

...is not an enclosing class ERROR referring : CurrentActivity.this

Does someone knows how to solve it ?

Thanks...

Answer 1

You need to pass to Intent constructor an instance of Context class. So if you need to start new activity from Fragment you shall write new Intent(getActivity(), NextActivity.class); and start it like getActivity().startActivity(myIntent);

Answer 2

If your are in a Class use this code:

public class AnyClassName{

    Context context;

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

   public void AnyMethod(){
    Intent myIntent = new Intent(context, NextActivity.class);
    context.startActivity(myIntent);   
  }

}

If you are in Fragment then use this:

 public Class AnyFragmnet extends Fragment{

  //all default methods which i am not declaring

  public void AnyMethodName(){
  Intent myIntent = new Intent(getActivity(), NextActivity.class);
  getActivity().startActivity(myIntent);
  }
}

Answer 3

there are some ways to solve this problem as I know. The main thing is you have to get a context object to start another activity. Let's try one of below:

1. If you are using fragment , try to call getActivity() when start activity from fragment as:

    Intent i = new Intent(getActivity(), NextActivity.class); getActivity.startActivity(i); 

2. Create an your Application class extends Application for your project and then call getApplicationContext() instead of call getActivity();

3. Pass an Context object to your fragment and then use it instead of getActivity() or getApplicationContext()