Konversi Mata Uang

kali ini saya akan memposting salah satu tugas pemrograman mobile android yang sudah saya pelajari pada waktu praktikum,,,
seperti biasanya ,saya mengunakan linear layout sebagai layoutnya,,,

Screenshot hasil aplikasi:








Activity_main.xml
<LinearLayout xmlns:android=""
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <EditText
        android:id="@+id/EditText1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
 
    <Spinner
        android:id="@+id/Spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
    <Button
        android:id="@+id/Btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Nilai Tukar" />
 
    <EditText
        android:id="@+id/EditText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numeric="decimal"
        android:hint="Hasilnya"/>
 
</LinearLayout>

MainActivity.java
package com.yogi.convertmoney;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

public class MainActivity extends Activity {
private Spinner Spinnerku;
private Button Buttonku;
private EditText ET1;
private EditText ET2;

String[] NilaiTukar ={
"Dolar Amerika ( USD )",
"Dolar Singapore (SGD )",
"Euro ( EUR )",
"Yen Jepang ( JPY )",
"Dolar Hongkong ( HKD )",
"Dolar Australia ( AUD )",
"Poundsterling Inggris ( GBP )"
};


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Spinnerku = (Spinner) findViewById(R.id.Spinner1);
Buttonku= (Button) findViewById(R.id.Btn1);
ET1=(EditText) findViewById(R.id.EditText1);
ET2=(EditText) findViewById(R.id.EditText2);

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, NilaiTukar);

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinnerku.setAdapter(adapter);
Buttonku.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String s=(String) Spinnerku.getSelectedItem();

int pos = Spinnerku.getSelectedItemPosition();

double hasil=0;
double uang=Double.parseDouble(ET2.getText().toString());
switch(pos){
case 0:
hasil=uang/9000;
break;
case 1:
hasil=uang/7000;
break;
case 2:
hasil=uang/12000;
break;
case 3:
hasil=uang/115;
break;
case 4:
hasil=uang/1100;
break;
case 5:
hasil=uang/9200;
break;
case 6:
hasil=uang/14100;
break;
default:
break;
}
ET1.setText(hasil+"");
}
});
}
@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;
}
}