getSupportFragmentManager().beginTransaction().
replace(R.id.fragment,new Fragment1()).commit();
raaio.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
switch (i){
case R.id.btn1:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,new Fragment1()).commit();
break;
case R.id.btn2:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,new Fragment2()).commit();
break;
case R.id.btn3:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,new Fragment3()).commit();
break;
case R.id.btn4:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,new Fragment4()).commit();
break;
}
}
});