Android : how to get converted in to int with edittext which is in another layout, but in same activity

here i have one code... which is using graph-view, but it is not getting worked, please help me. i used graph view and want to have dynamic value inserted in it. i used parsing int..

MainActivity.java:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button b1 = (Button) findViewById(R.id.button1);
    b1.setOnClickListener(this);
    et1 = (EditText) findViewById(R.id.editText1);
    et2 = (EditText) findViewById(R.id.editText2);
    et3 = (EditText) findViewById(R.id.editText3);
    et4 = (EditText) findViewById(R.id.editText4);
    et5 = (EditText) findViewById(R.id.editText5);
    et6 = (EditText) findViewById(R.id.editText6);

}


@Override
public void onClick(View v) {
    switch(v.getId()){
    case R.id.button1:
        super.setContentView(R.layout.graph);
        LayoutInflater factory=getLayoutInflater();
        View sulla=factory.inflate(R.layout.activity_main, null);
        et1=(EditText) sulla.findViewById(R.id.editText1);
        et2=(EditText) sulla.findViewById(R.id.editText2);
        et3=(EditText) sulla.findViewById(R.id.editText3);
        et4=(EditText) sulla.findViewById(R.id.editText4);
        et5=(EditText) sulla.findViewById(R.id.editText5);
        et6=(EditText) sulla.findViewById(R.id.editText6);
        i1= Integer.parseInt(et1.getText().toString());
        i2= Integer.parseInt(et2.getText().toString());
        i3= Integer.parseInt(et3.getText().toString());
        i4= Integer.parseInt(et4.getText().toString());
        i5= Integer.parseInt(et5.getText().toString());
        i6= Integer.parseInt(et6.getText().toString());

        GraphView graph=(GraphView) findViewById(R.id.graph);

         BarGraphSeries<DataPoint> series = new BarGraphSeries<DataPoint>(new DataPoint[] {
                 new DataPoint(0, i1),
                    new DataPoint(1, i2),
                    new DataPoint(2, i3),
                    new DataPoint(3, i4),
                    new DataPoint(4, i5),
                    new DataPoint(5, i6)
             });
             graph.addSeries(series);

             // styling
             series.setValueDependentColor(new ValueDependentColor<DataPoint>() {
                 @Override
                 public int get(DataPoint data) {
                 return Color.rgb((int) data.getX()*255/4, (int) Math.abs(data.getY()*255/6), 100);
                 }
             });

             series.setSpacing(50);

             // draw values on top
             series.setDrawValuesOnTop(true);
             series.setValuesOnTopColor(Color.RED);
             //series.setValuesOnTopSize(50);
        break;


    }   
}

}

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="vertical" >

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="English" >

    <requestFocus />
</EditText>

<EditText
    android:id="@+id/editText2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Hindi" />

<EditText
    android:id="@+id/editText3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="Physics" />

<EditText
    android:id="@+id/editText4"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="social" />

<EditText
    android:id="@+id/editText5"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="Maths" />

<EditText
    android:id="@+id/editText6"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="Biology" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button" />

</LinearLayout>

graph.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:orientation="vertical" >
<com.jjoe64.graphview.GraphView
    android:layout_width="match_parent"
    android:layout_height="200dip"
    android:id="@+id/graph" /> 
  </LinearLayout>