I am having some issues with this application. Everything looks fine to me, but when I run the app it loads perfectly, till I click the calculate button and try to make it think. Please give me a hint on what to fix or where to start looking because I am stumped!
Problem:
1. The opening screen requests the type of car wash package you would like to purchase.
The user selects which type of car wash — exterior only or exterior with interior vacuum services. The Car Wash app charges $8.99 for an exterior wash and $12.99 for an exterior wash with an interior vacuum for a package of 12 or more car washes. If you select less than 12 washes, the charge is $10.99 for an exterior wash or $15.99 for an exterior with interior vacuum.
When the CALCULATE PACKAGE button is selected, the total price is displayed for the number of car washes purchased (Figure 4-36).
Error received:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.androidbootcamp.carwashapp, PID: 3212
java.lang.IllegalArgumentException: Cannot format given Object as a Number
at java.text.DecimalFormat.format(DecimalFormat.java:593)
at java.text.Format.format(Format.java:157)
at net.androidbootcamp.carwashapp.MainActivity$1.onClick(MainActivity.java:53)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Java Code:
package net.androidbootcamp.carwashapp;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import com.google.android.gms.common.api.GoogleApiClient;
import java.text.DecimalFormat;
public class MainActivity extends AppCompatActivity {
double priceOne = 10.99;
double discountOne = 8.99;
double priceTwo = 15.99;
double discountTwo = 12.99;
double total;
double washesEntered;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setLogo(R.mipmap.ic_launcher);
getSupportActionBar().setDisplayUseLogoEnabled(true);
final EditText numWashes = (EditText) findViewById(R.id.numOfWashes);
final RadioButton exteriorOnly = (RadioButton) findViewById(R.id.radExteriorOnly);
final RadioButton exteriorInterior = (RadioButton) findViewById(R.id.radExteriorInterior);
final TextView result = (TextView) findViewById(R.id.txtResult);
Button calc = (Button) findViewById(R.id.btnCalulate);
calc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
washesEntered = Double.parseDouble(numWashes.getText().toString());
DecimalFormat tenth = new DecimalFormat("#.#");
if (exteriorOnly.isChecked() && washesEntered < 12) {
total = washesEntered * priceOne;
result.setText(tenth.format("$" + total + " for " + washesEntered + " washes"));
}
if (exteriorOnly.isChecked() && washesEntered > 12) {
total = washesEntered * discountOne;
result.setText(tenth.format("$" + total + " for " + washesEntered + " washes"));
}
if (exteriorInterior.isChecked() && washesEntered < 12) {
total = washesEntered * priceTwo;
result.setText(tenth.format("$" + total + " for " + washesEntered + " washes"));
}
if (exteriorInterior.isChecked() && washesEntered > 12) {
total = washesEntered * discountTwo;
result.setText(tenth.format("$" + total + " for " + washesEntered + " washes"));
}
}
});
}
}
XML Code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="net.androidbootcamp.carwashapp.MainActivity">
<TextView
android:text="@string/txtDiscount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/txtDiscount"
android:textSize="18sp"
android:layout_below="@+id/txtTitle"
android:layout_centerHorizontal="true" />
<Button
android:text="@string/btnCalculate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnCalulate"
android:textSize="24sp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
<TextView
android:text="@string/txtTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/txtTitle"
android:textSize="36sp"
android:textColor="#ffa500"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/carwash"
android:id="@+id/imgCarWash"
android:contentDescription="@string/imgDescription"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txtResult"
android:layout_marginTop="46dp"
android:layout_alignTop="@+id/imgCarWash"
android:layout_alignEnd="@+id/txtTitle"
android:textSize="18sp"
android:textColor="#0000ff"
android:textAlignment="center" />
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="18dp"
android:layout_below="@+id/txtDiscount"
android:layout_alignStart="@+id/txtDiscount">
<RadioButton
android:text="@string/radExteriorInterior"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/radExteriorOnly"
android:layout_alignStart="@+id/radExteriorOnly"
android:layout_marginTop="22dp"
android:id="@+id/radExteriorInterior" />
<RadioButton
android:text="@string/radExteriorOnly"
android:layout_width="178dp"
android:layout_height="wrap_content"
android:id="@+id/radExteriorOnly"
android:layout_below="@+id/numOfWashes"
android:layout_toEndOf="@+id/radioGroup4"
android:layout_marginStart="13dp" />
</RadioGroup>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/numOfWashes"
android:hint="@string/numOfWashes"
android:layout_below="@+id/txtDiscount"
android:layout_alignEnd="@+id/txtTitle"
android:layout_alignStart="@+id/btnCalulate" />
</RelativeLayout>
