Facebook Popup using PopupWindow

fb_comments_list_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:padding="10dp"
              android:paddingLeft="5dp"
              android:paddingRight="5dp">
    <ImageView
        android:src="@drawable/ic_launcher"
        android:layout_width="30dp"
        android:layout_height="30dp"/>

    <TextView
        android:id="@android:id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="@android:style/TextAppearance.Small"
        android:gravity="center_vertical"
        android:textColor="@color/black"/>

</LinearLayout>

fb_popup_bg.xml

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/white"/>
    <corners android:radius="5dp"/>
</shape>

fb_popup_layout.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/headerLayout"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:orientation="horizontal"
        android:layout_alignParentTop="true"
        android:gravity="center">

        <TextView
            android:layout_gravity="center"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Some One and 20 Others Like this"
            android:textColor="@color/black"
            android:textStyle="bold"
            android:layout_margin="5dp"/>
    </LinearLayout>

    <ListView
        android:id="@+id/commentsListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="5dp"
        android:layout_below="@id/headerLayout"
        android:paddingBottom="50dp"
        android:layout_marginBottom="0dp"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:src="@color/Gray"/>
        <EditText
            android:id="@+id/writeComment"
            android:hint="Write a Comment"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:textSize="12dp"
            android:textColor="@color/black"
            android:background="#00000000"/>
    </LinearLayout>

</RelativeLayout>

MainActivity.java

public class MainActivity extends
    private PopupWindow popWindow;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    // call this method when required to show popup
    public void onShowPopup(View v){

        LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // inflate the custom popup layout
        final View inflatedView = layoutInflater.inflate(R.layout.fb_popup_layout, null,false);
        // find the ListView in the popup layout
        ListView listView = (ListView)inflatedView.findViewById(R.id.commentsListView);

        // get device size
        Display display = getWindowManager().getDefaultDisplay();
        final Point size = new Point();
        display.getSize(size);
        mDeviceHeight = size.y;


        // fill the data to the list items
        setSimpleList(listView);


        // set height depends on the device size
        popWindow = new PopupWindow(inflatedView, size.x - 50,size.y - 400, true );
        // set a background drawable with rounders corners
        popWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.fb_popup_bg));
        // make it focusable to show the keyboard to enter in `EditText`
        popWindow.setFocusable(true);
        // make it outside touchable to dismiss the popup window
        popWindow.setOutsideTouchable(true);

        // show the popup at bottom of the screen and set some margin at bottom ie,
        popWindow.showAtLocation(v, Gravity.BOTTOM, 0,100);
    }
    
    
    void setSimpleList(ListView listView){
        
        ArrayList<String> contactsList = new ArrayList<String>();

        for (int index = 0; index < 10; index++) {
            contactsList.add("I am @ index " + index + " today " + Calendar.getInstance().getTime().toString());
        }

        listView.setAdapter(new ArrayAdapter<String>(TryMeActivity.this,
            R.layout.fb_comments_list_item, android.R.id.text1,contactsList));
    }
    
}

edittext is not showing while typing