Question

i have an activity with button on it and when a click i call the fragment with another button on fragment. but when click on fragment’s button i cant call a second fragment. this is my source, pretty simple:
activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context=".MainActivity" >

<Button 
    android:id="@+id/btn_click"
    android:text="Call Fragment"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:onClick="onClick"
    />
</LinearLayout>

fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:orientation="vertical" >

<TextView 
    android:id="@+id/fragment1"
    android:text="Fragment 1"
    android:textSize="25sp"
    android:gravity="center"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />

<Button 
    android:id="@+id/btn_frag2"
    android:text="Call Fragment 2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:orientation="vertical" >

<TextView 
    android:id="@+id/fragment2"
    android:text="Fragment 2"
    android:textSize="25sp"
    android:gravity="center_vertical|center_horizontal"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

public void onClick(View v) {
    Fragment1 fragment1 = new Fragment1();
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(android.R.id.content, fragment1);
    fragmentTransaction.commit();
}

}

Fragment1.java

public class Fragment1 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment1, container, false);
    }

    public void onClick2(View view) {
        Fragment2 fragment2 = new Fragment2();
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fragment1, fragment2);
        fragmentTransaction.commit();
    }
}

Fragment2.java

public class Fragment2 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment2, container, false);
    }
}

what is wrong in my code?

Answer 1

I think now Fragment nesting is available just update the back computability jar

now lets dig in the problem it self .

public void onClick2(View view) {
    Fragment2 fragment2 = new Fragment2();
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.fragment1, fragment2);
    fragmentTransaction.commit();
}

I think the R.id.fragment1 belongs to a TextView which is not a good place to include child views in because its not a ViewGroup, you can remove the textView from the xml and replace it with a LinearLayout lets say and it will work , if not tell me what the error .

fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:orientation="vertical" >

<LinearLayout 
    android:id="@+id/fragment1"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />

<Button 
    android:id="@+id/btn_frag2"
    android:text="Call Fragment 2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

Update for the error in the comment

public class Fragment1 extends Fragment implements OnClickListener{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment1, container, false);
((Button) v.findViewById(R.id.btn_frag2)).setOnClickListener(this);
    return v;
}

public void onClick(View view) {
    Fragment2 fragment2 = new Fragment2();
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction =        fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.container, fragment2);
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
}

}