Kotlin + Java Android Code Stock Profit Loss Calculate [Full Source Code]

This is the complete source code for a stock profit/loss calculator app on Android, written in Kotlin and Java. The app allows users to enter stock data and calculates the profit/loss based on the input, with the text color turning red for negative results and green for positive ones. It’s ideal for beginner to intermediate-level Android developers who want to learn Kotlin and Java while building practical skills.

Here is an example code in Kotlin that creates an Android app with input fields for the stock data and calculates the profit/loss based on those inputs:

Kotlin Code

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

val buyPrice = findViewById<EditText>(R.id.buy_price)
val sellPrice = findViewById<EditText>(R.id.sell_price)
val shares = findViewById<EditText>(R.id.shares)
val commission = findViewById<EditText>(R.id.commission)
val calculateButton = findViewById<Button>(R.id.calculate)
val results = findViewById<TextView>(R.id.results)

calculateButton.setOnClickListener {
val buyPriceValue = buyPrice.text.toString().toFloat()
val sellPriceValue = sellPrice.text.toString().toFloat()
val sharesValue = shares.text.toString().toInt()
val commissionValue = commission.text.toString().toFloat()

val buyCost = buyPriceValue * sharesValue
val sellCost = sellPriceValue * sharesValue
val totalCost = buyCost + sellCost + commissionValue

val profitLoss = sellCost - buyCost - commissionValue
val percentProfitLoss = (profitLoss / buyCost) * 100

if (profitLoss < 0) {
results.setTextColor(ContextCompat.getColor(this, R.color.red))
} else {
results.setTextColor(ContextCompat.getColor(this, R.color.green))
}

results.text = "Buy Cost: $${String.format("%.2f", buyCost)}\n" +
"Sell Cost: $${String.format("%.2f", sellCost)}\n" +
"Total Cost: $${String.format("%.2f", totalCost)}\n" +
"Profit/Loss: $${String.format("%.2f", profitLoss)}\n" +
"Percent Profit/Loss: ${String.format("%.2f", percentProfitLoss)}%"

results.visibility = View.VISIBLE
}
}
}

JAVA Code

public class MainActivity extends AppCompatActivity {

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

EditText buyPrice = findViewById(R.id.buy_price);
EditText sellPrice = findViewById(R.id.sell_price);
EditText shares = findViewById(R.id.shares);
EditText commission = findViewById(R.id.commission);
Button calculateButton = findViewById(R.id.calculate);
TextView results = findViewById(R.id.results);

calculateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
float buyPriceValue = Float.parseFloat(buyPrice.getText().toString());
float sellPriceValue = Float.parseFloat(sellPrice.getText().toString());
int sharesValue = Integer.parseInt(shares.getText().toString());
float commissionValue = Float.parseFloat(commission.getText().toString());

float buyCost = buyPriceValue * sharesValue;
float sellCost = sellPriceValue * sharesValue;
float totalCost = buyCost + sellCost + commissionValue;

float profitLoss = sellCost - buyCost - commissionValue;
float percentProfitLoss = (profitLoss / buyCost) * 100;

if (profitLoss < 0) {
results.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.red));
} else {
results.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.green));
}

results.setText("Buy Cost: $" + String.format("%.2f", buyCost) + "\n" +
"Sell Cost: $" + String.format("%.2f", sellCost) + "\n" +
"Total Cost: $" + String.format("%.2f", totalCost) + "\n" +
"Profit/Loss: $" + String.format("%.2f", profitLoss) + "\n" +
"Percent Profit/Loss: " + String.format("%.2f", percentProfitLoss) + "%");

results.setVisibility(View.VISIBLE);
}
});
}
}

First, in the layout file (activity_main.xml), you can create the input fields and a button for the user to calculate the profit/loss:

XML Code

<EditText
android:id="@+id/buy_price"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:hint="Buy Price" />

<EditText
android:id="@+id/sell_price"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:hint="Sell Price" />

<EditText
android:id="@+id/shares"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:hint="Shares" />

<EditText
android:id="@+id/commission"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:hint="Commission" />

<Button
android:id="@+id/calculate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Calculate Profit/Loss" />

<TextView
android:id="@+id/results"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone" />

In this code, the results TextView’s text color is set to red if the profit/loss value is negative and green if it’s positive. The ContextCompat.getColor method is used to get the color value from the app’s resources (defined in the colors.xml file).

You can define the red and green colors in the colors.xml file as follows:

<color name="red">#FF0000</color>
<color name="green">#00FF00</color>

With these changes, the results TextView font color will change to red or green depending on the profit/loss value.