White Box testing for Android Application.

package com.calculator.test;
import java.util.ArrayList;
import android.app.Activity;
import android.test.ActivityInstrumentationTestCase2;
import android.widget.EditText;
import android.widget.TextView;
import com.calculator.Main;
import com.calculator.R;
import com.jayway.android.robotium.solo.Solo;
public class TestMain extends ActivityInstrumentationTestCase2<Main> {
private Solo solo;
public TestMain() {
super("com.calculator", Main.class);
}
@Override
protected void setUp() throws Exception {
super.setUp();
solo = new Solo(getInstrumentation(), getActivity());
}
@Override
protected void tearDown() throws Exception{
try {
solo.finalize();
} catch (Throwable e) {
e.printStackTrace();
}
getActivity().finish();
super.tearDown();
}
public void testDisplayBlackBox() {
//Enter any integer/decimal value, we will enter 10 in first editfield
solo.enterText(0, "10");
//Enter any integer/decimal value, we will enter 20 in second editfield
solo.enterText(1, "20");
//Click on Multiply button
solo.clickOnButton("Multiply");
//Verify that resultant of 10 x 20
assertTrue(solo.searchText("200"));
}
public void testDisplayWhiteBox() {
//Defining our own values to multiply
float firstNumber = 10;
float secondNumber = 20;
float resutl = firstNumber * secondNumber ;
//Access First value (editfiled) and putting firstNumber value in it
EditText FirsteditText = (EditText) solo.getView(R.id.EditText01);
solo.enterText(FirsteditText, String.valueOf(firstNumber));
//Access Second value (editfiled) and putting SecondNumber value in it
EditText SecondeditText = (EditText) solo.getView(R.id.EditText02);
solo.enterText(SecondeditText, String.valueOf(secondNumber));
//Click on Multiply button
solo.clickOnButton("Multiply");
assertTrue(solo.searchText(String.valueOf(resutl)));
TextView outputField = (TextView) solo.getView(R.id.TextView01);
ArrayList currentTextViews = solo.getCurrentTextViews(outputField);
assertFalse(currentTextViews.isEmpty());
TextView output = (TextView) currentTextViews.get(0);
//Assert to verify result with visible value
assertEquals(String.valueOf(resutl), output.getText().toString());
}
}