Android : How to call a Fragment from CustomView

I created a Custom EditTextView and I want to call a Fragment when Custom EditTextView has focused.

I write a code like this, but I have got a error when call fragment.

if (someone has a good idea to call Fragment from custom View){please teach me();}

enter image description here

this is my code:

public class OriginalEditText extends EditText {

public OriginalEditText(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
}

public OriginalEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    setText("");
    setHint("it is original");

    setOnFocusChangeListener(new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (hasFocus) {
                // ////////////////////////////////////////////
                // /I want to Call Fragment here. ////////////
                // //////////////////////////////////////////
                Fragment fgm = null;
                testFragment testFragment=new testFragment();
                FragmentManager manager=fgm.getFragmentManager();//null pointerException occurred here
                FragmentTransaction transaction=manager.beginTransaction();

                transaction.add(R.id.originalEditText1,testFragment, "test" );
                transaction.commit();
                // ///////////////////////////////////////////////////////////////////////////////
                // /but above code not work.....How to call Fragment from CustomView ////////////
                // /////////////////////////////////////////////////////////////////////////////


            }

        }
    });

}

public OriginalEditText(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    // TODO Auto-generated constructor stub
}

}