package ch.ffhs.converter.app;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.EditText;
import android.widget.Spinner;
import ch.ffhs.converter.R;
/**
* Activity that implements currency conversion
*
* @author pelinux
*/
public class CurrenciesActivity
extends Activity
{
/*
* Constants for mapping value strings to internal IDs
*/
private static final String VALUE_CHF =
"CHF"; //$NON-NLS-1$
private static final String VALUE_EUR =
"EUR"; //$NON-NLS-1$
private static final String VALUE_USD =
"USD"; //$NON-NLS-1$
private static final int ITEM_CHF =
0;
private static final int ITEM_EUR =
1;
private static final int ITEM_USD =
2;
/**
* Maps value strings to internal IDs
*/
private final static HashMap<String,
Integer> valueToId =
new HashMap<String,
Integer>();
static
{
CurrenciesActivity.
valueToId.
put(CurrenciesActivity.
VALUE_CHF,
CurrenciesActivity.
ITEM_CHF);
CurrenciesActivity.
valueToId.
put(CurrenciesActivity.
VALUE_EUR,
CurrenciesActivity.
ITEM_EUR);
CurrenciesActivity.
valueToId.
put(CurrenciesActivity.
VALUE_USD,
CurrenciesActivity.
ITEM_USD);
}
/* Unit spinners (dropdowns) */
private Spinner spinnerUnit1
;
private Spinner spinnerUnit2
;
/** Called when the activity is first created. */
@
Override
public void onCreate
(Bundle savedInstanceState
)
{
super.
onCreate(savedInstanceState
);
this.
setContentView(R.
layout.
activity_currencies);
final EditText editValue1 =
(EditText
) this.
findViewById(R.
id.
currencies_edit_value1);
final EditText editValue2 =
(EditText
) this.
findViewById(R.
id.
currencies_edit_value2);
final OnKeyListener editValue1OnKey =
new OnKeyListener
() {
@
Override
public boolean onKey
(View v,
int keyCode,
KeyEvent event
)
{
Editable editable1 =
((EditText
) v
).
getText();
Double value1
;
try
{
value1 =
Double.
parseDouble(editable1.
toString());
}
catch (NumberFormatException e
)
{
value1 =
null;
}
String string2 =
""; //$NON-NLS-1$
if (value1
!=
null)
{
string2 = CurrenciesActivity.
this.
getConvertedValue(value1,
false);
}
editValue2.
setText(string2
);
return false;
}
};
editValue1.
setOnKeyListener(editValue1OnKey
);
final OnKeyListener editValue2OnKey =
new OnKeyListener
() {
@
Override
public boolean onKey
(View v,
int keyCode,
KeyEvent event
)
{
Editable editable2 =
((EditText
) v
).
getText();
Double value2
;
try
{
value2 =
Double.
parseDouble(editable2.
toString());
}
catch (NumberFormatException e
)
{
value2 =
null;
}
String string1 =
""; //$NON-NLS-1$
if (value2
!=
null)
{
string1 = CurrenciesActivity.
this.
getConvertedValue(value2,
true);
}
editValue1.
setText(string1
);
return false;
}
};
editValue2.
setOnKeyListener(editValue2OnKey
);
this.
spinnerUnit1 =
(Spinner
) this.
findViewById(R.
id.
currencies_spinner_unit1);
this.
spinnerUnit2 =
(Spinner
) this.
findViewById(R.
id.
currencies_spinner_unit2);
this.
spinnerUnit1.
setOnItemSelectedListener(new OnItemSelectedListener
() {
@
Override
public void onItemSelected
(AdapterView
<?> arg0,
View arg1,
int arg2,
long arg3
)
{
/* Simulate input in second EditText so that first EditText is updated */
editValue2OnKey.
onKey(editValue2,
0,
null);
}
@
Override
public void onNothingSelected
(AdapterView
<?> arg0
)
{
/* no-op */
}
});
this.
spinnerUnit2.
setSelection(1);
this.
spinnerUnit2.
setOnItemSelectedListener(new OnItemSelectedListener
() {
@
Override
public void onItemSelected
(AdapterView
<?> arg0,
View arg1,
int arg2,
long arg3
)
{
/* Simulate input in first EditText so that second EditText is updated */
editValue1OnKey.
onKey(editValue1,
0,
null);
}
@
Override
public void onNothingSelected
(AdapterView
<?> arg0
)
{
/* no-op */
}
});
}
/**
* @param value
* @return
*/
private String getConvertedValue
(double value,
boolean reverse
)
{
int selectedItemPosition1 =
this.
spinnerUnit1.
getSelectedItemPosition();
int selectedItemPosition2 =
this.
spinnerUnit2.
getSelectedItemPosition();
String[] itemArray =
this.
getResources().
getStringArray(R.
array.
currency_units_values);
String selectedItemValue1 = itemArray
[selectedItemPosition1
];
String selectedItemValue2 = itemArray
[selectedItemPosition2
];
if (reverse
)
{
String tmp = selectedItemValue1
;
selectedItemValue1 = selectedItemValue2
;
selectedItemValue2 = tmp
;
}
int itemId1 = CurrenciesActivity.
valueToId.
get(selectedItemValue1
);
int itemId2 = CurrenciesActivity.
valueToId.
get(selectedItemValue2
);
Double newValue = value
;
switch (itemId1
)
{
case ITEM_CHF:
switch (itemId2
)
{
case ITEM_EUR:
newValue =
new Double(value
* 0.767842293);
break;
case ITEM_USD:
newValue =
new Double(value
* 1.03413);
break;
}
break;
case ITEM_EUR:
switch (itemId2
)
{
case ITEM_CHF:
newValue =
new Double(value
* 1.30235077);
break;
case ITEM_USD:
newValue =
new Double(value
* 1.3468);
break;
}
break;
case ITEM_USD:
switch (itemId2
)
{
case ITEM_CHF:
newValue =
new Double(value
* 0.966996412);
break;
case ITEM_EUR:
newValue =
new Double(value
* 0.742500743);
break;
}
break;
}
return newValue.
toString();
}
}