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Posted on Sep 03, 2024

Java, Android App: Modify this app. Allow user to input the number of guests and calculate the tip and total per guest. 1 package com.jblearning.tipcalculatorvo;

Java, Android App: Modify this app. Allow user to input the number of guests and calculate the tip and total per guest. image text in transcribed

1 package com.jblearning.tipcalculatorvo; 3 public class TipCalculatorf private float tip; private float bi11; 6 7 public Tipcalculator( float newTip, float newBi11) ( setTip( newTip) setBill ( newBi11); 10 12 public float getTip() f 13 14 15 16 17 18 19 20 21 return tip public float getBill return bill; public void setTip( float newTip) ( if newTip > 0) tip newTip; 23 24 25 26 27 28 29 public void setBill( float newBill) ( if (newBill 0) bill - newBill; 30 public float tipAmount () f 31 3 2 return bill tip; public float totalAmount ( 3 4 35 36 37 return bill+tipAmount() 1 package com.jblearning.tipcalculatorv4 import android.os. Bundle 4 import android. support.v7.app. AppCompatActivity 5 import android.text.Editable: 6 import android.text.Textwatcher 7 import android.widget.EditText; 8 import android.widget.TextView; 9 import java.text. NumberFormat; 10 11 public class MainAactivity extends AppCompatActivity ( 13 public Number Format money NumberFormat.getCurrencyInstance 12 private TipCalculator tipCalc private EditText billEditText private EditText tipEditTexti 14 15 16 17 18 19 20 21 eoverride protected void oncreate( Bundle savedinstancestate) ( super.onCreate( savedInstanceState) tipCalc- new TipCalculator ( 0.17E, 100.0E setContentView( R.layout.activity main) billEditText ( EditText ) findviewById( R.d.an ountbill ); tipEditText = ( EditText ) findviemById( R.id.amount-tip-percent ) ; 23 24 25 26 27 28 29 30 31 public void calculate 32 - TextChangeHandler tch = new TextChangeHandler ( ); billEditText.addTextChangedListener( tch ) tipEditText.addTextChangedListener( tch) String billString billEditText.getText (.tostring String tipString tipEditText.getText ().tostring) 34 35 36 37 3 8 39 40 TextView tipTextView = TextView) findviewByid( R.id. amount tip TextView totalTextView = (TextView) findViewById( R.id.amount_total) try // convert billstring and tipstring to floats float billAmount Float.parseFloat ( billstring; int tipPercent Integer.parseint( tipstring; // update the Model tipCalc.setBill ( billAmount): tipCalc.setTip( .01f tipPercent // ask Model to calculate tip and total amounts 42 43 4 6 47 4 8 49 50 51 52 53 54 float tip tipcalc.tipAmount ) float total tipCalc.totalAmount ( // update the View with formatted tip and total amounts tipTextView.setText( money.format ( tip totalTextView.setText( money.format ( total ) ) ) catch( NumberFormatException nfe ) ( // pop up an alert view here 56 57 58 59 60 61 62 63 64 65 private class TextChangeHandler implements TextWatcher ( public void afterTextChanged( Editable e calculate) public void beforeTextChanged( Charsequence s, int start, int count, int after public void onTextChanged Charsequence s, int start, 67 68 69 70 int before, int after ( 1 package com.jblearning.tipcalculatorvo; 3 public class TipCalculatorf private float tip; private float bi11; 6 7 public Tipcalculator( float newTip, float newBi11) ( setTip( newTip) setBill ( newBi11); 10 12 public float getTip() f 13 14 15 16 17 18 19 20 21 return tip public float getBill return bill; public void setTip( float newTip) ( if newTip > 0) tip newTip; 23 24 25 26 27 28 29 public void setBill( float newBill) ( if (newBill 0) bill - newBill; 30 public float tipAmount () f 31 3 2 return bill tip; public float totalAmount ( 3 4 35 36 37 return bill+tipAmount() 1 package com.jblearning.tipcalculatorv4 import android.os. Bundle 4 import android. support.v7.app. AppCompatActivity 5 import android.text.Editable: 6 import android.text.Textwatcher 7 import android.widget.EditText; 8 import android.widget.TextView; 9 import java.text. NumberFormat; 10 11 public class MainAactivity extends AppCompatActivity ( 13 public Number Format money NumberFormat.getCurrencyInstance 12 private TipCalculator tipCalc private EditText billEditText private EditText tipEditTexti 14 15 16 17 18 19 20 21 eoverride protected void oncreate( Bundle savedinstancestate) ( super.onCreate( savedInstanceState) tipCalc- new TipCalculator ( 0.17E, 100.0E setContentView( R.layout.activity main) billEditText ( EditText ) findviewById( R.d.an ountbill ); tipEditText = ( EditText ) findviemById( R.id.amount-tip-percent ) ; 23 24 25 26 27 28 29 30 31 public void calculate 32 - TextChangeHandler tch = new TextChangeHandler ( ); billEditText.addTextChangedListener( tch ) tipEditText.addTextChangedListener( tch) String billString billEditText.getText (.tostring String tipString tipEditText.getText ().tostring) 34 35 36 37 3 8 39 40 TextView tipTextView = TextView) findviewByid( R.id. amount tip TextView totalTextView = (TextView) findViewById( R.id.amount_total) try // convert billstring and tipstring to floats float billAmount Float.parseFloat ( billstring; int tipPercent Integer.parseint( tipstring; // update the Model tipCalc.setBill ( billAmount): tipCalc.setTip( .01f tipPercent // ask Model to calculate tip and total amounts 42 43 4 6 47 4 8 49 50 51 52 53 54 float tip tipcalc.tipAmount ) float total tipCalc.totalAmount ( // update the View with formatted tip and total amounts tipTextView.setText( money.format ( tip totalTextView.setText( money.format ( total ) ) ) catch( NumberFormatException nfe ) ( // pop up an alert view here 56 57 58 59 60 61 62 63 64 65 private class TextChangeHandler implements TextWatcher ( public void afterTextChanged( Editable e calculate) public void beforeTextChanged( Charsequence s, int start, int count, int after public void onTextChanged Charsequence s, int start, 67 68 69 70 int before, int after (