public class MainActivity extends AppCompatActivity  {


    TextView topText;
    TextView topNumber;
    NumberPicker numberPicker;
    View topView;
    View bottomView;
    int enterNumber = 1;
    boolean isFullView;

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

        topText = (TextView) findViewById(R.id.topText);
        topNumber = (TextView) findViewById(R.id.topNumber);
        numberPicker = (NumberPicker) findViewById(R.id.numberPicker);
        topView =  findViewById(R.id.topView);
        bottomView =  findViewById(R.id.bottomView);

        topText.setText("Some Text");
        topNumber.setText(String.valueOf(enterNumber));

        numberPicker.setMinValue(0);
        numberPicker.setMaxValue(9);
        numberPicker.setValue(enterNumber);

        topView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                bottomView.setVisibility(isFullView ? View.VISIBLE : View.GONE);
                isFullView = !isFullView;
                topNumber.setText(String.valueOf(enterNumber));

            }
        });

        numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
            @Override
            public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

                enterNumber = newVal;

            }
        });
    }
}

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


     <LinearLayout
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:id="@+id/topView">

         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:id="@+id/topText"
             android:layout_gravity="center_horizontal"
             android:padding="6dp" />

         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:id="@+id/topNumber"
             android:layout_gravity="center_horizontal"
             android:padding="6dp" />
     </LinearLayout>

     <LinearLayout
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:id="@+id/bottomView"
         android:visibility="gone">

         <NumberPicker
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:id="@+id/numberPicker"
             android:layout_gravity="center_horizontal" />
     </LinearLayout>
 </LinearLayout>