1. Buat new project dengan nama MyCalculator.
2. Sekarang kita buat user interfacenya, edit activity_main.xml lalu ketikan kode berikut
<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">
<EditText
android:id="@+id/result_id"
android:layout_width="match_parent"
android:layout_height="70dp" />
<Button
android:id="@+id/Btn7_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/result_id"
android:onClick="btn7Clicked"
android:text="7" />
<Button
android:id="@+id/Btn8_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/result_id"
android:layout_toRightOf="@id/Btn7_id"
android:onClick="btn8Clicked"
android:text="8" />
<Button
android:id="@+id/Btn9_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/result_id"
android:layout_toRightOf="@id/Btn8_id"
android:onClick="btn9Clicked"
android:text="9" />
<Button
android:id="@+id/Btnclear_id"
android:layout_width="90dp"
android:layout_height="60dp"
android:layout_below="@id/result_id"
android:layout_toRightOf="@id/Btn9_id"
android:onClick="btnclearClicked"
android:text="clear" />
<Button
android:id="@+id/Btn4_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/Btn7_id"
android:onClick="btn4Clicked"
android:text="4" />
<Button
android:id="@+id/Btn5_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/Btn8_id"
android:layout_toRightOf="@id/Btn4_id"
android:onClick="btn5Clicked"
android:text="5" />
<Button
android:id="@+id/Btn6_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/Btn9_id"
android:layout_toRightOf="@id/Btn5_id"
android:onClick="btn6Clicked"
android:text="6" />
<Button
android:id="@+id/Btnplus_id"
android:layout_width="90dp"
android:layout_height="60dp"
android:layout_below="@id/Btnclear_id"
android:layout_toRightOf="@id/Btn6_id"
android:onClick="btnplusClicked"
android:text="+" />
<Button
android:id="@+id/Btn1_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/Btn4_id"
android:onClick="btn1Clicked"
android:text="1" />
<Button
android:id="@+id/Btn2_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/Btn5_id"
android:layout_toRightOf="@id/Btn1_id"
android:onClick="btn2Clicked"
android:text="2" />
<Button
android:id="@+id/Btn3_id"
android:layout_width="70dp"
android:layout_height="60dp"
android:layout_below="@id/Btn6_id"
android:layout_toRightOf="@id/Btn2_id"
android:onClick="btn3Clicked"
android:text="3" />
<Button
android:id="@+id/Btnminus_id"
android:layout_width="90dp"
android:layout_height="60dp"
android:layout_below="@id/Btnplus_id"
android:layout_toRightOf="@id/Btn3_id"
android:onClick="btnminusClicked"
android:text="-" />
<Button
android:id="@+id/Btnequal_id"
android:layout_width="110dp"
android:layout_height="60dp"
android:layout_below="@id/Btn1_id"
android:onClick="btnequalClicked"
android:text="=" />
<Button
android:id="@+id/Btndivide_id"
android:layout_width="90dp"
android:layout_height="60dp"
android:layout_below="@id/Btn1_id"
android:layout_toRightOf="@id/Btnequal_id"
android:onClick="btndivideClicked"
android:text="/" />
<Button
android:id="@+id/Btnmulti_id"
android:layout_width="100dp"
android:layout_height="60dp"
android:layout_below="@id/Btnminus_id"
android:layout_toRightOf="@id/Btndivide_id"
android:onClick="btnmultiClicked"
android:text="*" />
</RelativeLayout>
3. Sekarang kita ke bagian otak dari aplikasi, edit MainActivity.java lalu ketikan kode berikut :
package net.agusharyanto.mycalculator;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
public String str ="";
Character op = 'q';
float i,num,numtemp;
EditText showResult;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showResult = (EditText)findViewById(R.id.result_id);
}
public void btn1Clicked(View v){
insert(1);
}
public void btn2Clicked(View v){
insert(2);
}
public void btn3Clicked(View v){
insert(3);
}
public void btn4Clicked(View v){
insert(4);
}
public void btn5Clicked(View v){
insert(5);
}
public void btn6Clicked(View v){
insert(6);
}
public void btn7Clicked(View v){
insert(7);
}
public void btn8Clicked(View v){
insert(8);
}
public void btn9Clicked(View v){
insert(9);
}
public void btnplusClicked(View v){
perform();
op = '+';
}
public void btnminusClicked(View v){
perform();
op = '-';
}
public void btndivideClicked(View v){
perform();
op = '/';
}
public void btnmultiClicked(View v){
perform();
op = '*';
}
public void btnequalClicked(View v){
calculate();
}
public void btnclearClicked(View v){
reset();
}
private void reset() {
// TODO Auto-generated method stub
str ="";
op ='q';
num = 0;
numtemp = 0;
showResult.setText("");
}
private void insert(int j) {
// TODO Auto-generated method stub
str = str+Integer.toString(j);
num = Integer.valueOf(str).intValue();
showResult.setText(str);
}
private void perform() {
// TODO Auto-generated method stub
str = "";
calculateNoShow();
numtemp = num;
}
private void calculate() {
// TODO Auto-generated method stub
if(op == '+')
num = numtemp+num;
else if(op == '-')
num = numtemp-num;
else if(op == '/')
num = numtemp/num;
else if(op == '*')
num = numtemp*num;
showResult.setText(""+num);
}
private void calculateNoShow() {
// TODO Auto-generated method stub
if(op == '+')
num = numtemp+num;
else if(op == '-')
num = numtemp-num;
else if(op == '/')
num = numtemp/num;
else if(op == '*')
num = numtemp*num;
}
}
4. Sekarang mari kita run projectnya
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