Fragment Example in Android(With Extrenal JAVA File)

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <TextView
        android:layout_width="0px"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#555555"
        android:text="It's TextView in main Activity"
        android:textColor="#ffccff"
        android:textSize="30dp" />

    <FrameLayout
        android:id="@+id/myfragment"
        android:layout_width="0px"
        android:layout_height="match_parent"
        android:layout_weight="4" >
    </FrameLayout>

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.fragmentexampleinandroidwithextrenaljavafile;

import android.annotation.SuppressLint;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

public class MainActivity extends FragmentActivity {

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

        FragmentTransaction fragmentTransaction = getFragmentManager()
                .beginTransaction();

        MyFragment myFragment = new MyFragment();

        fragmentTransaction.add(R.id.myfragment, myFragment);

        fragmentTransaction.commit();
    }

}

MyFragment.java

package in.blogspot.kantapp.fragmentexampleinandroidwithextrenaljavafile;

/**
 * Created by kanta on 01-Jun-16.
 */
import android.annotation.SuppressLint;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

@SuppressLint("NewApi")
public class MyFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View myFragmentView = inflater.inflate(R.layout.fragmentlayout,
                container, false);
        return myFragmentView;
    }

}

fragmentlayout.xml

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

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="It's a Fragment" />

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@mipmap/ic_launcher" />

</LinearLayout>