------------------------------Activity
public class TeacherListView extends FragmentActivity implements OnClickListener{
	private LinearLayout MenuList;
	private Button btnTgl;
	private int screenWidth;
	private boolean isExpanded;
	private JSONObject jsData;
	private String url;
	private int tes=0;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_teacher_list_view);
		Fragment fr = HomeFragment.newInstance();
		getSupportFragmentManager().beginTransaction().add(R.id.frag, fr).commit();
		MenuList = (LinearLayout) findViewById(R.id.linearLayout2);
		btnTgl = (Button) findViewById(R.id.button1);
		btnTgl.setOnClickListener(this);
		DisplayMetrics mtrcs = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(mtrcs);
		screenWidth=mtrcs.widthPixels;
		Button homeBtn = (Button) findViewById(R.id.btn_home);
		homeBtn.setOnClickListener(this);
		Button tpickBtn = (Button) findViewById(R.id.btn_tPick);
		tpickBtn.setOnClickListener(this);



	}
	public void onClick(View v){
		switch(v.getId()){
		case R.id.btn_home:
			if(isExpanded){
				collapseAnim();
			}
			addHomeFragment();
			break;
		case R.id.button1:
			if(isExpanded){
				collapseAnim();
			}else{
				expandAnim();
			}
			break;
		case R.id.btn_tPick:
			if(isExpanded){
				collapseAnim();
			}
			addTPicker();
			break;
		}
	}
	public void addHomeFragment(){
		Fragment fr = HomeFragment.newInstance();
		getSupportFragmentManager().beginTransaction().replace(R.id.frag, fr).commit();

	}
	public void addTPicker(){

		Fragment fr =  TeacherPickerFragment.newInstance();
		getSupportFragmentManager().beginTransaction().replace(R.id.frag, fr, "tag").commit();
//		Fragment mf = getSupportFragmentManager().findFragmentByTag("tag");
		TeacherPickerFragment tp = (TeacherPickerFragment) getSupportFragmentManager().findFragmentByTag("tag");
		tp.changeText();
	}

	public void expandAnim(){
		isExpanded = true;
		MenuList.startAnimation(new ExpandAnimation(MenuList, 0, (int)(screenWidth*0.7),20));
	}
	public void collapseAnim(){
		isExpanded = false;
		MenuList.startAnimation(new CollapseAnimation(MenuList, 0, (int)(screenWidth*0.7),20));
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.teacher_list_view, menu);
		return true;
	}


}
---------------------------------------------- fragment
public class TeacherPickerFragment extends Fragment {
	TextView t;
	public static Fragment newInstance(){
		TeacherPickerFragment myFrag = new TeacherPickerFragment();
		return myFrag;
	}

	@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
		Log.d("ssxx","test");
        // Inflate the layout for this fragment
		View view = inflater.inflate(R.layout.teacher_picker, container, false);
		t = (TextView) view.findViewById(R.id.randNum);
        return view;
    }
	public void changeText(){
		t.setText("test");
	}
}
--------------xml activity
<FrameLayout
    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"
    tools:context=".TeacherListView" >
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
         <LinearLayout
            android:id="@+id/linearLayout2"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0"
            android:orientation="vertical"
            android:background="#ffffff">
            <Button
                android:id="@+id/btn_home"
                android:layout_marginTop="1dp"
                android:layout_marginBottom="1dp"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@drawable/btn_states"/>
            <Button
                android:id="@+id/btn_tPick"
                android:layout_marginTop="1dp"
                android:layout_marginBottom="1dp"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@drawable/btn_states"/>
            <Button
                android:id="@+id/btn_rand"
                android:layout_marginTop="1dp"
                android:layout_marginBottom="1dp"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@drawable/btn_states"/>
            <Button
                android:id="@+id/btn_supCall"
                android:layout_marginTop="1dp"
                android:layout_marginBottom="1dp"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@drawable/btn_states"/>
            <Button
                android:id="@+id/btn_feedBack"
                android:layout_marginTop="1dp"
                android:layout_marginBottom="1dp"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@drawable/btn_states"/>
            <Button
                android:id="@+id/btn_lgOut"
                android:layout_marginTop="1dp"
                android:layout_marginBottom="1dp"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:background="@drawable/btn_states"/>
            <LinearLayout
                android:id="@+id/empty"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="4"
                android:orientation="vertical"></LinearLayout>
        </LinearLayout>
            <LinearLayout
                android:id="@+id/linearLayout3"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:orientation="vertical"
                android:background="#ff0000">
	    			<LinearLayout
				        android:id="@+id/linearLayout5"
				        android:layout_width="match_parent"
				        android:layout_height="0dp"
				        android:layout_weight="1"
				        android:orientation="vertical"
				        android:background="#00ff00" >
				        <Button
				            android:id="@+id/button1"
				            android:layout_width="wrap_content"
				            android:layout_height="wrap_content"
				            android:text="ToggleMenu"
				            android:layout_marginTop="2dp" />
	    			</LinearLayout>
	    			<LinearLayout
	    			    android:id="@+id/frag"
	    			    android:layout_width="match_parent"
	    			    android:layout_height="0dp"
	    			    android:layout_weight="9"
	    			    android:background="#0000ff"></LinearLayout>"
			</LinearLayout>
    </LinearLayout>
</FrameLayout>
----------------------------xml fragment
<?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:orientation="vertical"
    android:background="#848484"
    android:id="@+id/tepi">
    <TextView
        android:id="@+id/randNum"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:text="random number here"
        android:textSize="35sp"></TextView>

</LinearLayout>