How would I add a TextWatcher to the following Java calculator app code: package com.example.tipcalculatorv2; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private EditText billEditText; private TextView totalTextView; private EditText tipPercentEditText; private TextView tipTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); billEditText = (EditText) findViewById(R.id.amount_bill); totalTextView = (TextView) findViewById(R.id.amount_total); tipPercentEditText = (EditText) findViewById(R.id.amount_tip_percent); tipTextView = (TextView) findViewById(R.id.amount_tip); } public void calculate(View view) { String billStr=billEditText.getText().toString(); totalTextView.setText(billStr); String tipPercentStr=tipPercentEditText.getText().toString(); tipTextView.setText(billStr); try { float billAmount = Float.parseFloat(billStr); float tipPercent = Float.parseFloat(tipPercentStr); float tip = billAmount * tipPercent / 100; tipTextView.setText(Float.toString(tip)); float total = billAmount + tip; totalTextView.setText(Float.toString(total)); } catch (NumberFormatException e) { Context context = getApplicationContext(); CharSequence text = "Please enter numbers for bill and tip"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show(); e.printStackTrace(); } } }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

How would I add a TextWatcher to the following Java calculator app code:

package com.example.tipcalculatorv2;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private EditText billEditText;
private TextView totalTextView;
private EditText tipPercentEditText;
private TextView tipTextView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
billEditText = (EditText) findViewById(R.id.amount_bill);
totalTextView = (TextView) findViewById(R.id.amount_total);
tipPercentEditText = (EditText) findViewById(R.id.amount_tip_percent);
tipTextView = (TextView) findViewById(R.id.amount_tip);
}

public void calculate(View view) {
String billStr=billEditText.getText().toString();
totalTextView.setText(billStr);
String tipPercentStr=tipPercentEditText.getText().toString();
tipTextView.setText(billStr);
try {
float billAmount = Float.parseFloat(billStr);
float tipPercent = Float.parseFloat(tipPercentStr);
float tip = billAmount * tipPercent / 100;
tipTextView.setText(Float.toString(tip));
float total = billAmount + tip;
totalTextView.setText(Float.toString(total));
} catch (NumberFormatException e) {
Context context = getApplicationContext();
CharSequence text = "Please enter numbers for bill and tip";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();

e.printStackTrace();
}

}
}

Expert Solution

Step 1: Providing Introduction

You can include a TextWatcher in your EditText fields to increase the functionality of your calculator app. As the user inputs or adjusts values in the input fields, this will enable you to update calculations in real-time.

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