Need a help with this app. when I run this app, it is stopped. Here a...
Need a help with this app. when I run this app, it is stopped.
Here a source code for Tip calculator application.
activity_main.xml
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFF"
android:id="@+id/tableLayout"
android:stretchColumns="1,2,3"
android:padding="5dp">
<!-- tableRow0 -->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow0">
<TextView
android:id="@+id/billTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/billTotal"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText
android:layout_width="wrap_content"
android:id="@+id/billEditText"
android:layout_height="wrap_content"
android:layout_span="3"
android:inputType="numberDecimal"
android:layout_weight="1">
</EditText>
</TableRow>
<!-- tableRow1 -->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow1">
<TextView
android:id="@+id/tenTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="10%"
android:textColor="#000"
android:layout_column="1"
android:gravity="center"
android:layout_weight="1">
</TextView>
<TextView
android:id="@+id/fifteenTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="15%"
android:textColor="#000"
android:gravity="center"
android:layout_weight="1">
</TextView>
<TextView
android:id="@+id/twentyTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="20%"
android:textColor="#000"
android:gravity="center"
android:layout_weight="1">
</TextView>
</TableRow>
<!-- tableRow2 -->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow2">
<TextView
android:id="@+id/tipTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tip"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText android:layout_width="wrap_content"
android:id="@+id/tip10EditText"
android:layout_height="wrap_content"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText android:layout_width="wrap_content"
android:id="@+id/tip15EditText"
android:layout_height="wrap_content"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/tip20EditText"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
</TableRow>
<!-- tableRow3 -->
<TableRow android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow3">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/totalTextView"
android:text="@string/total"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText android:layout_width="wrap_content"
android:text="@string/zero"
android:layout_height="wrap_content"
android:id="@+id/total10EditText"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText android:layout_width="wrap_content"
android:text="@string/zero"
android:layout_height="wrap_content"
android:id="@+id/total15EditText"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText
android:layout_width="wrap_content"
android:text="@string/zero"
android:layout_height="wrap_content"
android:id="@+id/total20EditText"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
</TableRow>
<!-- tableRow4 -->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow4">
<TextView
android:id="@+id/customTextView"
android:layout_width="wrap_content"
android:text="@string/custom"
android:textColor="#000"
android:paddingRight="5dp"
android:gravity="right|center_vertical"
android:layout_height="match_parent"
android:paddingBottom="5dp"
android:focusable="false">
</TextView>
<SeekBar
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/customSeekBar"
android:layout_span="2"
android:progress="18"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingBottom="5dp"
android:layout_weight="1">
</SeekBar>
<TextView
android:id="@+id/customTipTextView"
android:layout_width="wrap_content"
android:text="18%"
android:textColor="#000"
android:gravity="center_vertical"
android:layout_height="match_parent"
android:paddingLeft="5dp"
android:paddingBottom="5dp"
android:focusable="false"
android:layout_weight="1">
</TextView>
</TableRow>
<!-- tableRow5 -->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow5">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tipCustomTextView"
android:text="@string/tip"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tipCustomEditText"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<TextView
android:id="@+id/totalCustomTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/total"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp"
android:layout_weight="1">
</TextView>
<EditText
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/totalCustomEditText"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
</TableRow>
</TableLayout>
</RelativeLayout>
________________________________________________________________________
MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class MainActivity extends AppCompatActivity {
// constants used when saving/restoring state
private static final String BILL_TOTAL = "BILL_TOTALL";
private static final String CUSTOM_PERCENT = "CUSTOM_PERCENT";
private double currentBillTotal;
private int currentCustomPercent;
private EditText tip10EditText;
private EditText total10EditText;
private EditText tip15EditText;
private EditText total15EditText;
private EditText billEditText;
private EditText tip20EditText;
private EditText total20EditText;
private TextView customTipTextView;
private EditText tipCustomEditText;
private EditText totalCustomEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// check if app just started or being restored from memory
if(savedInstanceState == null)
{
currentBillTotal = 0.0; // initialize the bill amount to zero
currentCustomPercent = 18; // initialize the custom tip to 18%
}
else
{
// initialize the custom tip to saved tip percent
currentBillTotal = savedInstanceState.getDouble(BILL_TOTAL);
// initialize the custom tip to saved tip percent
currentCustomPercent = savedInstanceState.getInt(CUSTOM_PERCENT);
}
// get references to the 10, 15, 20% tip and total EditTexts
tip10EditText = (EditText)findViewById(R.id.tip10EditText);
total10EditText = (EditText)findViewById(R.id.total10EditText);
tip15EditText = (EditText)findViewById(R.id.tip15EditText);
total15EditText = (EditText)findViewById(R.id.total15EditText);
tip20EditText = (EditText)findViewById(R.id.tip20EditText);
total20EditText = (EditText)findViewById(R.id.total20EditText);
// get the TextView displaying the custom tip percentage
customTipTextView = (TextView)findViewById(R.id.customTipTextView);
// get the custom tip and total EditTexts
tipCustomEditText = (EditText)findViewById(R.id.tipCustomEditText);
totalCustomEditText = (EditText)findViewById(R.id.totalCustomEditText);
// get the billEditText
billEditText = (EditText)findViewById(R.id.billEditText);
// billEditTextWatcher handles billEditText's onTextChanged event
billEditText.addTextChangedListener((TextWatcher) billEditText);
// the the SeekBar used to set the custom tip amount
SeekBar customSeekBar = (SeekBar)findViewById(R.id.customSeekBar);
customSeekBar.setOnSeekBarChangeListener((OnSeekBarChangeListener) customSeekBar);
}
private void updateStandard()
{
// calculate bill total with a 10% tip
double tenPercentTip = currentBillTotal * 0.1;
double tenPercentTotal = currentBillTotal + tenPercentTip;
// set tipTenEditText's text to tenPercentTip
tip10EditText.setText(String.format("%0.02f", tenPercentTip));
// set totalTenEditText's text to tenPercentTotal
tip10EditText.setText(String.format("%0.02f", tenPercentTotal));
// calculate bill total with a 15% tip
double fifteenPercentTip = currentBillTotal * 0.15;
double fifteenPercentTotal = currentBillTotal + fifteenPercentTip;
// set tipFifteenEditText's text to 15% tip
tip15EditText.setText(String.format("%0.02f", fifteenPercentTip));
// set totalFifteenEditText's text to fifteenPercentTotal
tip15EditText.setText(String.format("0.02f", fifteenPercentTotal));
// calculate bill total with a 20% tip
double twentyPercentTip = currentBillTotal * 0.2;
double twentyPercentTotal = currentBillTotal + twentyPercentTip;
// set tipTwentyEditText's text to twentyPercentTip
tip20EditText.setText(String.format("%0.02f", twentyPercentTip));
//set totalTwentyEditText's text to twentyPercentTotal
total20EditText.setText(String.format("%0.02f", twentyPercentTotal));
}
private void updateCustom()
{
// set customTipTextView's text to match the position of the SeekBar
customTipTextView.setText(currentCustomPercent + "%");
// calculate the custom tip amount
double customTipAmount = currentBillTotal * currentCustomPercent * 0.01;
// calculate the total bill, including the custom tip
double customTotalAmount = currentBillTotal + customTipAmount;
// display the tip and total bill amounts
tipCustomEditText.setText(String.format("0.02f", customTipAmount));
totalCustomEditText.setText(String.format("0.02f", customTotalAmount));
}
// save values of billEditText and customSeekBar
@Override
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
outState.putDouble(BILL_TOTAL, currentBillTotal);
outState.putInt(CUSTOM_PERCENT, currentCustomPercent);
}
private OnSeekBarChangeListener customSeekBarListener = new OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
// set currentCustomPercent to position of the SeekBar's thumb
currentCustomPercent = seekBar.getProgress();
updateCustom();
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
};
private TextWatcher billEditTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// convert billEditText's text to a double
try
{
currentBillTotal = Double.parseDouble(s.toString());
}
catch (NumberFormatException e)
{
currentBillTotal = 0.0; // default if an exception occurs
}
}
@Override
public void afterTextChanged(Editable s) {
}
};
}
__________________________________________________________________
string.xml
<resources>
<string name="app_name">Tipcalculator</string>
<string name = "billTotal">Bill total</string>
<string name = "tip">Tip</string>
<string name = "total">Total</string>
<string name = "custom">Custom</string>
<string name = "zero">0.00</string>
</resources>
Homework Answers
activity_main.xml
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFF"
android:id="@+id/tableLayout"
android:stretchColumns="1,2,3"
android:padding="5dp">
<!-- tableRow0
-->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow0">
<TextView
android:id="@+id/billTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/billTotal"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText
android:layout_width="wrap_content"
android:id="@+id/billEditText"
android:layout_height="wrap_content"
android:layout_span="3"
android:inputType="numberDecimal"
android:layout_weight="1">
</EditText>
</TableRow>
<!-- tableRow1
-->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow1">
<TextView
android:id="@+id/tenTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="10%"
android:textColor="#000"
android:layout_column="1"
android:gravity="center"
android:layout_weight="1">
</TextView>
<TextView
android:id="@+id/fifteenTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="15%"
android:textColor="#000"
android:gravity="center"
android:layout_weight="1">
</TextView>
<TextView
android:id="@+id/twentyTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="20%"
android:textColor="#000"
android:gravity="center"
android:layout_weight="1">
</TextView>
</TableRow>
<!-- tableRow2
-->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow2">
<TextView
android:id="@+id/tipTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tip"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText android:layout_width="wrap_content"
android:id="@+id/tip10EditText"
android:layout_height="wrap_content"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText android:layout_width="wrap_content"
android:id="@+id/tip15EditText"
android:layout_height="wrap_content"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/tip20EditText"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
</TableRow>
<!-- tableRow3
-->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow3">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/totalTextView"
android:text="@string/total"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText android:layout_width="wrap_content"
android:text="@string/zero"
android:layout_height="wrap_content"
android:id="@+id/total10EditText"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText android:layout_width="wrap_content"
android:text="@string/zero"
android:layout_height="wrap_content"
android:id="@+id/total15EditText"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<EditText
android:layout_width="wrap_content"
android:text="@string/zero"
android:layout_height="wrap_content"
android:id="@+id/total20EditText"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
</TableRow>
<!-- tableRow4
-->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow4">
<TextView
android:id="@+id/customTextView"
android:layout_width="wrap_content"
android:text="@string/custom"
android:textColor="#000"
android:paddingRight="5dp"
android:gravity="right|center_vertical"
android:layout_height="match_parent"
android:paddingBottom="5dp"
android:focusable="false">
</TextView>
<SeekBar
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/customSeekBar"
android:layout_span="2"
android:progress="18"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingBottom="5dp"
android:layout_weight="1">
</SeekBar>
<TextView
android:id="@+id/customTipTextView"
android:layout_width="wrap_content"
android:text="18%"
android:textColor="#000"
android:gravity="center_vertical"
android:layout_height="match_parent"
android:paddingLeft="5dp"
android:paddingBottom="5dp"
android:focusable="false"
android:layout_weight="1">
</TextView>
</TableRow>
<!-- tableRow5
-->
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tableRow5">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tipCustomTextView"
android:text="@string/tip"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp">
</TextView>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tipCustomEditText"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
<TextView
android:id="@+id/totalCustomTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/total"
android:textColor="#000"
android:gravity="right"
android:paddingRight="5dp"
android:layout_weight="1">
</TextView>
<EditText
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/totalCustomEditText"
android:text="@string/zero"
android:gravity="center"
android:focusable="false"
android:layout_weight="1"
android:textSize="14sp"
android:cursorVisible="false"
android:longClickable="false">
</EditText>
</TableRow>
</TableLayout>
</RelativeLayout>
________________________________________________________________________
MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class MainActivity extends AppCompatActivity {
// constants used when saving/restoring state
private static final String BILL_TOTAL = "BILL_TOTALL";
private static final String CUSTOM_PERCENT = "CUSTOM_PERCENT";
private double currentBillTotal;
private int currentCustomPercent;
private EditText tip10EditText;
private EditText total10EditText;
private EditText tip15EditText;
private EditText total15EditText;
private EditText billEditText;
private EditText tip20EditText;
private EditText total20EditText;
private TextView customTipTextView;
private EditText tipCustomEditText;
private EditText totalCustomEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// check if app just started or being restored from memory
if(savedInstanceState == null)
{
currentBillTotal = 0.0; // initialize the bill amount to zero
currentCustomPercent = 18; // initialize the custom tip to 18%
}
else
{
// initialize the custom tip to saved tip percent
currentBillTotal = savedInstanceState.getDouble(BILL_TOTAL);
// initialize the custom tip to saved tip percent
currentCustomPercent = savedInstanceState.getInt(CUSTOM_PERCENT);
}
// get references to the 10, 15, 20% tip and total EditTexts
tip10EditText = (EditText)findViewById(R.id.tip10EditText);
total10EditText = (EditText)findViewById(R.id.total10EditText);
tip15EditText = (EditText)findViewById(R.id.tip15EditText);
total15EditText = (EditText)findViewById(R.id.total15EditText);
tip20EditText = (EditText)findViewById(R.id.tip20EditText);
total20EditText = (EditText)findViewById(R.id.total20EditText);
// get the TextView displaying the custom tip percentage
customTipTextView = (TextView)findViewById(R.id.customTipTextView);
// get the custom tip and total EditTexts
tipCustomEditText = (EditText)findViewById(R.id.tipCustomEditText);
totalCustomEditText = (EditText)findViewById(R.id.totalCustomEditText);
// get the billEditText
billEditText = (EditText)findViewById(R.id.billEditText);
// billEditTextWatcher handles billEditText's onTextChanged event
// change
billEditText.addTextChangedListener(billEditTextWatcher);
// the the SeekBar used to set the custom tip amount
SeekBar customSeekBar = (SeekBar)findViewById(R.id.customSeekBar);
// change
customSeekBar.setOnSeekBarChangeListener(customSeekBarListener);
}
private void updateStandard()
{
// calculate bill total with a 10% tip
double tenPercentTip = currentBillTotal * 0.1;
double tenPercentTotal = currentBillTotal + tenPercentTip;
// set tipTenEditText's text to tenPercentTip
tip10EditText.setText(String.format("%0.02f", tenPercentTip));
// set totalTenEditText's text to tenPercentTotal
tip10EditText.setText(String.format("%0.02f", tenPercentTotal));
// calculate bill total with a 15% tip
double fifteenPercentTip = currentBillTotal * 0.15;
double fifteenPercentTotal = currentBillTotal + fifteenPercentTip;
// set tipFifteenEditText's text to 15% tip
tip15EditText.setText(String.format("%0.02f", fifteenPercentTip));
// set totalFifteenEditText's text to fifteenPercentTotal
tip15EditText.setText(String.format("0.02f", fifteenPercentTotal));
// calculate bill total with a 20% tip
double twentyPercentTip = currentBillTotal * 0.2;
double twentyPercentTotal = currentBillTotal + twentyPercentTip;
// set tipTwentyEditText's text to twentyPercentTip
tip20EditText.setText(String.format("%0.02f", twentyPercentTip));
//set totalTwentyEditText's text to twentyPercentTotal
total20EditText.setText(String.format("%0.02f", twentyPercentTotal));
}
private void updateCustom()
{
// set customTipTextView's text to match the position of the SeekBar
customTipTextView.setText(currentCustomPercent + "%");
// calculate the custom tip amount
double customTipAmount = currentBillTotal * currentCustomPercent * 0.01;
// calculate the total bill, including the custom tip
double customTotalAmount = currentBillTotal + customTipAmount;
// display the tip and total bill amounts
tipCustomEditText.setText(String.format("0.02f", customTipAmount));
totalCustomEditText.setText(String.format("0.02f", customTotalAmount));
}
// save values of billEditText and customSeekBar
@Override
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
outState.putDouble(BILL_TOTAL, currentBillTotal);
outState.putInt(CUSTOM_PERCENT, currentCustomPercent);
}
private OnSeekBarChangeListener customSeekBarListener = new OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
// set currentCustomPercent to position of the SeekBar's thumb
currentCustomPercent = seekBar.getProgress();
updateCustom();
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
};
private TextWatcher billEditTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// convert billEditText's text to a double
try
{
currentBillTotal = Double.parseDouble(s.toString());
}
catch (NumberFormatException e)
{
currentBillTotal = 0.0; // default if an exception occurs
}
}
@Override
public void afterTextChanged(Editable s) {
}
};
}
__________________________________________________________________
string.xml
<resources>
<string name="app_name">Tipcalculator</string>
<string name = "billTotal">Bill total</string>
<string name = "tip">Tip</string>
<string name = "total">Total</string>
<string name = "custom">Custom</string>
<string name = "zero">0.00</string>
</resources>
Output:
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Need a help with this app. when I run this app, it is
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