Exercise 8-4 Use an EditTextPreference element In this exercise, youll modify the Tip Calculator app presented in this chapter so it uses an EditTextPreference element. Although this type of preference wasnt described in this chapter, it works similarly to the CheckBoxPreference element, and you can look it up in the documentation for the API if necessary. When youre done, a test run should look like this:

Sorry cant get the picture to show up. If you run it before changes you will see what it looks like except it needs the fifth row with a name label and they it needs to display a name as outlined in step 3.

1. Start Android Studio and open the project named ch08_ex4_TipCalculator. 1. Open the preferences.xml file in the xml directory. Add an EditTextPreference element for a setting named Name. This setting should allow the user to enter his or her full name.

2. Run the app and use the Settings activity to enter your name.

3. Open the layout of the activity. Modify the layout, so it includes a fifth row that can display a name. Open the class for the Tip Calculator activity. Modify this code so it gets the name from the preferences and displays that name in t

package com.murach.tipcalculator;

import java.text.NumberFormat;

import android.os.Bundle;

import android.preference.PreferenceManager;

import android.view.KeyEvent;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.inputmethod.EditorInfo;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.TextView.OnEditorActionListener;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

public class TipCalculatorActivity extends Activity

implements OnEditorActionListener, OnClickListener {

// define variables for the widgets

private EditText billAmountEditText;

private TextView percentTextView;

private Button percentUpButton;

private Button percentDownButton;

private TextView tipTextView;

private TextView totalTextView;

// define instance variables that should be saved

private String billAmountString = "";

private float tipPercent = .15f;

// define rounding constants

private final int ROUND_NONE = 0;

private final int ROUND_TIP = 1;

private final int ROUND_TOTAL = 2;

// set up preferences

private SharedPreferences prefs;

private boolean rememberTipPercent = true;

private int rounding = ROUND_NONE;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_tip_calculator);

// get references to the widgets

billAmountEditText = (EditText) findViewById(R.id.billAmountEditText);

percentTextView = (TextView) findViewById(R.id.percentTextView);

percentUpButton = (Button) findViewById(R.id.percentUpButton);

percentDownButton = (Button) findViewById(R.id.percentDownButton);

tipTextView = (TextView) findViewById(R.id.tipTextView);

totalTextView = (TextView) findViewById(R.id.totalTextView);

// set the listeners

billAmountEditText.setOnEditorActionListener(this);

percentUpButton.setOnClickListener(this);

percentDownButton.setOnClickListener(this);

// set the default values for the preferences

PreferenceManager.setDefaultValues(this, R.xml.preferences, false);

// get default SharedPreferences object

prefs = PreferenceManager.getDefaultSharedPreferences(this);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.activity_tip_calculator, menu);

return true;

}

@Override

public void onPause() {

// save the instance variables

Editor editor = prefs.edit();

editor.putString("billAmountString", billAmountString);

editor.putFloat("tipPercent", tipPercent);

editor.commit();

super.onPause();

}

@Override

public void onResume() {

super.onResume();

// get preferences

rememberTipPercent = prefs.getBoolean("pref_remember_percent", true);

rounding = Integer.parseInt(prefs.getString("pref_rounding", "0"));

// get the instance variables

billAmountString = prefs.getString("billAmountString", "");

if (rememberTipPercent) {

tipPercent = prefs.getFloat("tipPercent", 0.15f);

} else {

tipPercent = 0.15f;

}

// set the bill amount on its widget

billAmountEditText.setText(billAmountString);

// calculate and display

calculateAndDisplay();

}

public void calculateAndDisplay() {

// get the bill amount

billAmountString = billAmountEditText.getText().toString();

float billAmount;

if (billAmountString.equals("")) {

billAmount = 0;

}

else {

billAmount = Float.parseFloat(billAmountString);

}

// calculate tip and total

float tipAmount = 0;

float totalAmount = 0;

float tipPercentToDisplay = 0;

if (rounding == ROUND_NONE) {

tipAmount = billAmount * tipPercent;

totalAmount = billAmount + tipAmount;

tipPercentToDisplay = tipPercent;

}

else if (rounding == ROUND_TIP) {

tipAmount = StrictMath.round(billAmount * tipPercent);

totalAmount = billAmount + tipAmount;

tipPercentToDisplay = tipAmount / billAmount;

}

else if (rounding == ROUND_TOTAL) {

float tipNotRounded = billAmount * tipPercent;

totalAmount = StrictMath.round(billAmount + tipNotRounded);

tipAmount = totalAmount - billAmount;

tipPercentToDisplay = tipAmount / billAmount;

}

// display the other results with formatting

NumberFormat currency = NumberFormat.getCurrencyInstance();

tipTextView.setText(currency.format(tipAmount));

totalTextView.setText(currency.format(totalAmount));

NumberFormat percent = NumberFormat.getPercentInstance();

percentTextView.setText(percent.format(tipPercentToDisplay));

}

@Override

public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

int keyCode = -1;

if (event != null) {

keyCode = event.getKeyCode();

}

if (actionId == EditorInfo.IME_ACTION_DONE ||

actionId == EditorInfo.IME_ACTION_UNSPECIFIED ||

keyCode == KeyEvent.KEYCODE_DPAD_CENTER ||

keyCode == KeyEvent.KEYCODE_ENTER) {

calculateAndDisplay();

}

return false;

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.percentDownButton:

tipPercent = tipPercent - .01f;

calculateAndDisplay();

break;

case R.id.percentUpButton:

tipPercent = tipPercent + .01f;

calculateAndDisplay();

break;

}

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.menu_settings:

// Toast.makeText(this, "Settings", Toast.LENGTH_SHORT).show();

startActivity(new Intent(getApplicationContext(), SettingsActivity.class));

return true;

case R.id.menu_about:

// Toast.makeText(this, "About", Toast.LENGTH_SHORT).show();

startActivity(new Intent(getApplicationContext(), AboutActivity.class));

return true;

default:

return super.onOptionsItemSelected(item);

}

}

}

preference.xml

android:key="pref_remember_percent"

android:title="@string/remember_percent_title"

android:summary="@string/remember_percent_summary"

android:defaultValue="true" />

android:key="pref_rounding"

android:title="@string/rounding_title"

android:summary="@string/rounding_summary"

android:dialogTitle="@string/rounding_title"

android:entries="@array/rounding_keys"

android:entryValues="@array/rounding_values"

android:defaultValue="@string/rounding_default" />

Activity_Tip_Calculator.xml (xml from Layout)

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="10dp" >

android:id="@+id/billAmountLabel"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10dp"

android:text="@string/bill_amount_label"

android:textSize="20sp"

android:textStyle="bold" />

android:id="@+id/billAmountEditText"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/billAmountLabel"

android:layout_marginLeft="5dp"

android:layout_toRightOf="@+id/billAmountLabel"

android:ems="8"

android:inputType="numberDecimal"

android:text="@string/bill_amount"

android:textSize="20sp" >

android:id="@+id/percentLabel"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/billAmountLabel"

android:layout_below="@+id/billAmountLabel"

android:padding="10dp"

android:text="@string/tip_percent_label"

android:textSize="20sp"

android:textStyle="bold" />

android:id="@+id/percentTextView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/percentLabel"

android:layout_alignLeft="@+id/billAmountEditText"

android:padding="5dp"

android:text="@string/tip_percent"

android:textSize="20sp" />

android:id="@+id/percentDownButton"

android:layout_width="45dp"

android:layout_height="45dp"

android:layout_alignBaseline="@+id/percentTextView"

android:layout_marginLeft="25dp"

android:layout_toRightOf="@+id/percentTextView"

android:text="@string/decrease"

android:textSize="20sp" />

android:id="@+id/percentUpButton"

android:layout_width="45dp"

android:layout_height="45dp"

android:layout_alignBaseline="@+id/percentDownButton"

android:layout_toRightOf="@+id/percentDownButton"

android:text="@string/increase"

android:textSize="20sp" />

android:id="@+id/tipLabel"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/percentLabel"

android:layout_below="@+id/percentLabel"

android:padding="10dp"

android:text="@string/tip_amount_label"

android:textSize="20sp"

android:textStyle="bold" />

android:id="@+id/tipTextView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/tipLabel"

android:layout_alignLeft="@id/billAmountEditText"

android:padding="5dp"

android:text="@string/tip_amount"

android:textSize="20sp" />

android:id="@+id/totalLabel"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/tipLabel"

android:layout_below="@+id/tipLabel"

android:padding="10dp"

android:text="@string/total_amount_label"

android:textSize="20sp"

android:textStyle="bold" />

android:id="@+id/totalTextView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/totalLabel"

android:layout_alignLeft="@+id/tipTextView"

android:padding="5dp"

android:text="@string/total_amount"

android:textSize="20sp" />

strings.xml

xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">Tip Calculatorstring> <string name="title_activity_tip_calculator">Tip Calculatorstring> <string name="bill_amount_label">Bill Amountstring> <string name="bill_amount">string> <string name="tip_percent_label">Percentstring> <string name="tip_percent">15%string> <string name="increase">+string> <string name="decrease">-string> <string name="tip_amount_label">Tipstring> <string name="tip_amount">$0.00string> <string name="total_amount_label">Totalstring> <string name="total_amount">$0.00string> <string name="menu_settings">Settingsstring> <string name="menu_about">Aboutstring> <string name="title_activity_settings">Settingsstring> <string name="remember_percent_title">Remember Tip Percentstring> <string name="remember_percent_summary">Remembers the tip percent for the most recent calculation.string> <string name="rounding_title">Rounding?string> <string name="rounding_summary">Sets the rounding option for the calculation.string> <string-array name="rounding_keys"> <item >Noneitem> <item >Tipitem> <item >Totalitem> string-array> <string-array name="rounding_values"> <item >0item> <item >1item> <item >2item> string-array> <string name="rounding_default">0string> <string name="title_activity_about">Aboutstring> <string name="about">This version of the Tip Calculator app calculates all tips on the post-tax total for the bill.string> resources>

This question has been asked twice before but neither answer appears to be correct! Thank you to anyone who can help!