Cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager

Question

I am creating an application using fragments for a tablet. So far I have created several buttons on the left side, and fragments appear when I click on the buttons.

But I am experiencing an error in the MainActivity.java file "Type mismatch error: cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager ". And this is the main reason why I can not implement it. I have already imported android.support.v4.app.FragmentManager .

How can I solve my problem?

My code for MainActivity.java

  import android.app.Activity; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.View; import android.widget.Button; public class MainActivity extends Activity { Fragment fragment; Button btn1,btn2,btn3,btn4,btn5,btn6; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn1=(Button)findViewById(R.id.btn1); btn2=(Button)findViewById(R.id.btn2); btn3=(Button)findViewById(R.id.btn3); btn4=(Button)findViewById(R.id.btn4); btn5=(Button)findViewById(R.id.btn5); btn6=(Button)findViewById(R.id.btn6); FragmentManager fm=getFragmentManager(); FragmentTransaction ft=fm.beginTransaction(); StartFragment myfragment=new StartFragment(); ft.add(R.id.myfragment,myfragment); ft.commit(); btn4.setOnClickListener(btnOnClickListener); btn5.setOnClickListener(btnOnClickListener); btn6.setOnClickListener(btnOnClickListener); } Button.OnClickListener btnOnClickListener=new Button.OnClickListener(){ @Override public void onClick(View v) { Fragment newfragment; if(v==btn1) { newfragment=new Fragment1(); } else if(v==btn2) { newfragment=new Fragment2(); } else if(v==btn3) { newfragment=new Fragment3(); } else if(v==btn4) { newfragment=new Fragment4(); } else if(v==btn5) { newfragment=new Fragment5(); } else if(v==btn6) { newfragment=new Fragment6(); } else { newfragment=new StartFragment(); } FragmentTransaction transaction=getFragmentManager.beginTransaction(); transaction.replace(R.id.myfragment,newfragment); transaction.addToBackStack(null); transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); transaction.commit(); } }; } 

Answer 1

You need to use getSupportFragmentManager() in your code, not getFragmentManager() - see here for more details.

You also need to extend your class from android.support.v4.app.FragmentActivity , and not just from the standard android.Activity in order to get this method.