Membuat Konversi Suhu Android menggunakan Eclipse

Sudah lama tak menulis disini,kali ini sambil mengingat ingat kembali ilmu pemograman android saya mencoba membuat aplikasi sederhana.Yaitu membuat aplikasi  konversi Suhu berbasis android,aplikasi ini saya buat menggunakan eclipse.

Langsung saja sebelum membuat aplikasi ini Klik file
 File-New project-Android app project,tekan next terus sampai finish.

1.Langkah pertama adalah buka activity_main.xml di folder layout

<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" > <TableLayout android:id="@+id/tableLayout1" android:layout_width="wrap_content" android:layout_height="wrap_content" > <TableRow android:id="@+id/tableRow1" android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Masukkan suhu" /> <EditText android:id="@+id/editText1" android:layout_width="140dp" android:layout_height="wrap_content" android:inputType="numberDecimal" > <requestfocus /> </EditText> <Spinner android:id="@+id/spinner1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </TableRow> <TableRow android:id="@+id/tableRow2" android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Konversi suhu" android:onClick="Konversi"/> </TableRow> <TableRow android:id="@+id/tableRow3" android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Celcius" /> <EditText android:id="@+id/editText2" android:layout_width="140dp" android:layout_height="wrap_content" android:inputType="number" android:editable="false" /> </TableRow> <tablerow> <TextView android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Reamur" /> <EditText android:id="@+id/editText3" android:layout_width="140dp" android:layout_height="wrap_content" android:inputType="number" android:editable="false"/> </TableRow> <tablerow> <TextView android:id="@+id/textView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Fahrenheit" /> <EditText android:id="@+id/editText4" android:layout_width="140dp" android:layout_height="wrap_content" android:inputType="number" android:editable="false" /> </TableRow> <tablerow> <TextView android:id="@+id/textView6" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Kelvin" /> <EditText android:id="@+id/editText5" android:layout_width="140dp" android:layout_height="wrap_content" android:inputType="number" android:editable="false" /> </TableRow> </TableLayout> </RelativeLayout>

2.Berikutnya buka MainActivity.java di folder src

package com.example.suhumu;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {

private Spinner sp;
 private EditText edt_awal, edt_C, edt_R, edt_F, edt_K;
 private String[] list={"C","R","F","K"};
 Double awal, celcius, reamur, fahrenheit, kelvin;
 ArrayAdapter adapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 sp=(Spinner) findViewById(R.id.spinner1);
 edt_awal=(EditText) findViewById(R.id.editText1);
 edt_C=(EditText) findViewById(R.id.editText2);
 edt_R=(EditText) findViewById(R.id.editText3);
 edt_F=(EditText) findViewById(R.id.editText4);
 edt_K=(EditText) findViewById(R.id.editText5);

 adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, list);
 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 sp.setAdapter(adapter);
 }

 public void Konversi(View v){
 String satuan = String.valueOf(sp.getSelectedItemPosition());
 if(edt_awal.getText().toString().equals("")){
 Toast.makeText(getBaseContext(), "Masukkan suhu awal, default suhu awal = 0 jika tidak dimasukkan suhu awal", Toast.LENGTH_LONG).show();
 awal = 0.0;
 }else{
 awal = Double.parseDouble(edt_awal.getText().toString());
 }
 if(satuan.equals("0")){
 celcius = awal;
 reamur = 0.8 * awal;
 fahrenheit = (1.8 * awal) + 32;
 kelvin = awal + 273;

 edt_C.setText(String.valueOf(celcius));
 edt_R.setText(String.valueOf(reamur));
 edt_F.setText(String.valueOf(fahrenheit));
 edt_K.setText(String.valueOf(kelvin));
 }else if(satuan.equals("1")){
 celcius = 1.25 * awal;
 reamur = awal;
 fahrenheit = (2.25 * awal) + 32;
 kelvin = celcius + 273;

 edt_C.setText(String.valueOf(celcius));
 edt_R.setText(String.valueOf(reamur));
 edt_F.setText(String.valueOf(fahrenheit));
 edt_K.setText(String.valueOf(kelvin));
 }else if(satuan.equals("2")){
 celcius = 0.55555 *(awal - 32);
 reamur = 0.44444 * (awal-32);
 fahrenheit = awal;
 kelvin = celcius + 273;

 edt_C.setText(String.valueOf(celcius));
 edt_R.setText(String.valueOf(reamur));
 edt_F.setText(String.valueOf(fahrenheit));
 edt_K.setText(String.valueOf(kelvin));
 }else if(satuan.equals("3")){
 celcius = awal-273;
 reamur = 0.8 * (awal-273);
 fahrenheit = (1.8 * (awal-273)) + 32;
 kelvin = awal;

 edt_C.setText(String.valueOf(celcius));
 edt_R.setText(String.valueOf(reamur));
 edt_F.setText(String.valueOf(fahrenheit));
 edt_K.setText(String.valueOf(kelvin));
 }
 }
}

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