When I attempt to change the text of the textbox it does not seem to
change and I cant figure out why. Here is my code:
package com.android.theperfecttip;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class The_Perfect_Tip extends Activity
{
private EditText myBillAmt;
private EditText myPrecentage;
private TextView myAns;
private Button myCalcButton;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myBillAmt = ((EditText)findViewById(R.id.BillAmt));
myPrecentage = ((EditText)findViewById(R.id.Precentage));
myAns = ((TextView)findViewById(R.id.Ans));
myCalcButton = ((Button)findViewById(R.id.CalculateBTN));
double billNum =
Double.parseDouble(myBillAmt.getText().toString());
double preNum =
Double.parseDouble(myPrecentage.getText().toString
());
myAns.setText(""+calcTip(billNum,preNum));
}
public double calcTip(double billAmt,double prec)
{
try
{
return (prec / 100) * billAmt;
}
catch(NullPointerException ex)
{
Log.e("Excep:", "Null Pointer Exception");
}
catch(NumberFormatException ex)
{
Log.e("Excep:", "Number Format Exception");
}
return -1;
}
}
And here is the XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:alwaysDrawnWithCache="true">
<TextView android:id="@+id/BillAmtLBL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Bill Amount"/>
<EditText android:id="@+id/BillAmt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"/>
<TextView android:id="@+id/PrecentageLBL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Precentage"
/>
<EditText android:id="@+id/Precentage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
/>
<TextView android:id="@+id/AnsLBL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text = "Tip Amount"
/>
<TextView android:id="@+id/Ans"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text = "0"
/>
<Button android:id = "@+id/CalculateBTN"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text = "Calculate"
/>
</LinearLayout>
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