Android Tip Calculator Source Code

Here is source code of the Program to Demonstrate Tip Calculator. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

The following code teaches u how to change the color of a component’s text and change the background color of the component.

Main Activity

package com.example.tip_calculator;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final EditText amt = (EditText) findViewById(R.id.bill_amt);
        final EditText tip = (EditText) findViewById(R.id.bill_per);
        final TextView result = (TextView) findViewById(R.id.res);
 
        Button calc = (Button) findViewById(R.id.button1);
        calc.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                double amount = Double.parseDouble(amt.toString());
                double tip_per = Double.parseDouble(tip.toString());
                double tip_cal = (amount * tip_per) / 100;
                result.setText("Result : " + Double.toString(tip_cal));
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

Actvity_Main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    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=".MainActivity" >
 
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="47dp"
        android:background="@android:color/holo_blue_dark"
        android:text="Enter Your Bill amount"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@android:color/holo_red_dark" />
 
    <TextView
        android:id="@+id/res"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignRight="@+id/button1"
        android:layout_marginBottom="14dp"
        android:text="Result : "
        android:textAppearance="?android:attr/textAppearanceLarge" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/res"
        android:layout_alignParentLeft="true"
        android:layout_alignRight="@+id/textView2"
        android:layout_marginBottom="34dp"
        android:background="@android:color/black"
        android:text="Calculate"
        android:textColor="@android:color/white" />
 
    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="96dp"
        android:background="@android:color/holo_green_dark"
        android:text="Enter Tip Percentage :"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@android:color/holo_red_dark" />
 
    <EditText
        android:id="@+id/bill_amt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="41dp"
        android:ems="10" >
 
        <requestFocus />
    </EditText>
 
    <EditText
        android:id="@+id/bill_per"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="22dp"
        android:ems="10" />
 
</RelativeLayout>

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