You cannot replace a fragment attached to the layout, you need to create a host container as FrameLayout
like this:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/fmchangebutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Change Fragment" />
<FrameLayout
android:id="@+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Then, you will able to - first - add
and display the first fragment and replace
it with the second as follows:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set the layout which contains the framelayout
setContentView(R.layout.activity_main);
final FragmentManager fm = this.getFragmentManager();
final Fragment fragmentone = new FragmentOne();
final Fragment fragmenttwo = new FragmentTwo();
// if first initialization
if(savedInstanceState == null) {
// display with "add" the first fragment
this.getFragmentManager().beginTransaction()
.add(R.id.frame_layout, fragmentone).commit();
}
Button fmchangebutton = (Button) this.findViewById(R.id.fmchangebutton);
fmchangebutton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
FragmentTransaction ft = fm.beginTransaction();
// "replace" the fragment inside the framelayout
ft.replace(R.id.frame_layout, fragmenttwo);
ft.commit();
}
});
}