MTJian's程式設計開發日記: 小專案分享-公尺與英呎互換並儲存目前數值

心血來潮做了個小東東，也閒閒沒事無聊設計出台斤及公斤換算方便家父買菜:D 哈哈!!

此範例為簡單的公尺與英尺互相換算，有興趣的朋友也可加強至換算為各項單位。

------------------------------------------GOOD2.JAVA-----------------------------------------

public class GDD02 extends Activity {


    private Button Button1,Button2;
    private EditText EText;
    private TextView infoView;
    double     xx,yy;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        findview();
        setlistener();
           }

    public void findview()
    {
        EText = (EditText) findViewById(R.id.Height);
              infoView = (TextView)findViewById(R.id.BMI_Suggest);
                   Button1= (Button)findViewById(R.id.btn1);
                          Button2= (Button)findViewById(R.id.btn2);
    }

    public void setlistener()
    {
        Button1.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Convert1();
            }
        });

        Button2.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Convert2();
            }
        });
    }

    private void Convert1()
    {
        try{
            DecimalFormat cf = new DecimalFormat("0.0");
            DecimalFormat nf = new DecimalFormat("0.00");
            xx=Double.parseDouble(EText.getText().toString());
            yy=Double.parseDouble(EText.getText().toString())*3.28;
        infoView.setText(String.valueOf(cf.format(xx)+"公尺="+nf.format(yy)+"英尺"));


        }
        catch (NumberFormatException e)
        {
            infoView.setText("請輸入數字!");
        }

        }

    private void Convert2()
    {
        try{
        DecimalFormat cf = new DecimalFormat("0.0");
        DecimalFormat nf = new DecimalFormat("0.00");
        xx=Double.parseDouble(EText.getText().toString());
        yy=Double.parseDouble(EText.getText().toString())*0.3048;
        infoView.setText(String.valueOf(cf.format(xx)+"英尺="+nf.format(yy)+"公尺"));
        }
        catch (NumberFormatException e)
        {
            infoView.setText("請輸入數字!");
        }

    }
    protected static final int MENU_RESET =Menu.FIRST;
    protected static final int SAVE =Menu.FIRST+1;
    protected static final int PUT =Menu.FIRST+2;
    @Override
    public boolean
    onCreateOptionsMenu(Menu menu)
    {
        MenuInflater inflater = getMenuInflater();
        menu.add(0, MENU_RESET, 0, "重設");
        menu.add(0, SAVE, 1, "儲存當前數值");
        menu.add(0, PUT, 2, "載入偏好設定");

        return true;
    }

    public boolean
    onOptionsItemSelected(MenuItem item)
    {
        switch(item.getItemId()){

        case MENU_RESET:
            ResetValue();
           break;

        case SAVE:
            SAVE();
           break;

        case PUT:
            PUT();
        break;

               }

        return true;
    }

    private void ResetValue()
    {
        EText.setText("");
        infoView.setText("");
    }
    private void SAVE()
    {
        SharedPreferences settings = getSharedPreferences("Preference", 0);
                  //置入屬性的字串
        settings.edit().putString("name", EText.getText().toString()).commit();
        settings.edit().putString("math", infoView.getText().toString()).commit();
    }
    private void PUT()
    {
        SharedPreferences settings = getSharedPreferences("Preference", 0);
                  //取出屬性的字串
                 String name = settings.getString("name", "");
                 EText.setText(name);
                 String math = settings.getString("math", "");
                 infoView.setText(math);
    }

}

------------------------------------------main.xml-----------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget41"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:id="@+id/in_Height"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/in_Height"
>
</TextView>
<EditText
android:id="@+id/Height"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numeric="integer"
android:text="@string/Height"
>
</EditText>
<TextView
android:id="@+id/BMI_Result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/BMI_Result"
>
</TextView>
<TextView
android:id="@+id/BMI_Suggest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/BMI_Suggest"
>
</TextView>

<RelativeLayout
    android:id="@+id/relativeLayout1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="@string/btn2" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/btn1" />

</RelativeLayout>

</LinearLayout>

------------------------------------------實際運行畫面-----------------------------------------