android - 内部アクティビティから startActivityForResult を呼び出す

Question

次の内部活動を伴う活動があります

public class Closer extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        doMyWork();
    }

    public void gotoCat() {
        Intent intent = new Intent(this, CatActivity.class);
        startActivityForResult(intent, 1);
    }
}

しかし、コードを実行すると、行に根ざした NPE が表示されますstartActivityForResult(intent, 1)。どうすればこれを成功させることができますか?

囲んでいるアクティビティからの呼び出しはnew Closer.gotoCat()

エラー：

  java.lang.NullPointerException
at android.app.Activity.startActivityForResult(Activity.java:3430)
at android.app.Activity.startActivityForResult(Activity.java:3391)
at com.company.Game.widget.MyView$Closer.gotoCat(MyView.java:496)
at com.company.Game.widget.MyView.onDragEndSoCallCat(MyView.java:315)
at com.company.Game.widget.MyView.onTouch(MyView.java:254)
at android.view.View.dispatchTouchEvent(View.java:7456)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2264)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1995)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2270)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2010)