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/trunk/src/ch/ffhs/converter/app/TemperaturesActivity.java
1,57 → 1,263
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
 
package ch.ffhs.converter.app;
 
// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import java.util.HashMap;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
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 android.widget.TextView;
import ch.ffhs.converter.R;
 
/**
* <h3>Dialog Activity</h3>
* Activity that implements length conversion
*
* <p>
* This demonstrates the how to write an activity that looks like a pop-up
* dialog.
* </p>
* @author pelinux
*/
public class TemperaturesActivity extends Activity
{
/**
* Initialization of the Activity after it is first created. Must at least
* call {@link android.app.Activity#setContentView setContentView()} to
* describe what is to be displayed in the screen.
*
*/
private static final String MSG_BELOW_ABS_ZERO = "K must be >= 0";
/*
* Constants for mapping value strings to internal IDs
*/
private static final String VALUE_CELSIUS = "C"; //$NON-NLS-1$
private static final String VALUE_FAHRENHEIT = "F"; //$NON-NLS-1$
private static final String VALUE_KELVIN = "K"; //$NON-NLS-1$
private static final int ITEM_CELSIUS = 0;
private static final int ITEM_FAHRENHEIT = 1;
private static final int ITEM_KELVIN = 2;
 
/**
* Maps value strings to internal IDs
*/
private final static HashMap<String, Integer> valueToId =
new HashMap<String, Integer>();
 
/* Unit spinners (dropdowns) */
private Spinner spinnerUnit1;
private Spinner spinnerUnit2;
 
/* Hint that value is off scale */
private TextView textOffScale;
 
static
{
TemperaturesActivity.valueToId.put(TemperaturesActivity.VALUE_CELSIUS,
TemperaturesActivity.ITEM_CELSIUS);
TemperaturesActivity.valueToId.put(TemperaturesActivity.VALUE_FAHRENHEIT,
TemperaturesActivity.ITEM_FAHRENHEIT);
TemperaturesActivity.valueToId.put(TemperaturesActivity.VALUE_KELVIN,
TemperaturesActivity.ITEM_KELVIN);
}
 
/** Called when the activity is first created. */
 
@Override
protected void onCreate(Bundle savedInstanceState)
public void onCreate(Bundle savedInstanceState)
{
// Be sure to call the super class.
super.onCreate(savedInstanceState);
this.setContentView(R.layout.activity_temperatures);
 
this.requestWindowFeature(Window.FEATURE_LEFT_ICON);
this.textOffScale =
(TextView) this.findViewById(R.id.temperatures_text_off_scale);
 
// See assets/res/any/layout/dialog_activity.xml for this
// view layout definition, which is being set here as
// the content of our screen.
this.setContentView(R.layout.dialog_activity);
final EditText editValue1 =
(EditText) this.findViewById(R.id.temperatures_edit_value1);
final EditText editValue2 =
(EditText) this.findViewById(R.id.temperatures_edit_value2);
 
this.getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
android.R.drawable.ic_dialog_alert);
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 = TemperaturesActivity.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 = TemperaturesActivity.this.getConvertedValue(value2, true);
}
 
editValue1.setText(string1);
 
return false;
}
};
editValue2.setOnKeyListener(editValue2OnKey);
 
this.spinnerUnit1 =
(Spinner) this.findViewById(R.id.temperatures_spinner_unit1);
this.spinnerUnit2 =
(Spinner) this.findViewById(R.id.temperatures_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.temperature_units_values);
String selectedItemValue1 = itemArray[selectedItemPosition1];
String selectedItemValue2 = itemArray[selectedItemPosition2];
 
if (reverse)
{
String tmp = selectedItemValue1;
selectedItemValue1 = selectedItemValue2;
selectedItemValue2 = tmp;
}
 
int itemId1 = TemperaturesActivity.valueToId.get(selectedItemValue1);
int itemId2 = TemperaturesActivity.valueToId.get(selectedItemValue2);
 
Double newValue = value;
 
this.textOffScale.setVisibility(View.INVISIBLE);
 
switch (itemId1)
{
case ITEM_CELSIUS:
switch (itemId2)
{
case ITEM_FAHRENHEIT:
newValue = new Double(value * 9.0 / 5 + 32);
break;
 
case ITEM_KELVIN:
newValue = new Double(value + 273.15);
 
if (newValue < 0.0)
{
this.textOffScale.setVisibility(View.VISIBLE);
return "*" + newValue.toString();
}
break;
}
break;
 
case ITEM_FAHRENHEIT:
switch (itemId2)
{
case ITEM_CELSIUS:
newValue = new Double((value - 32) * 5.0 / 9);
break;
 
case ITEM_KELVIN:
newValue = new Double((value + 459.67) * 5.0 / 9);
 
if (newValue < 0.0)
{
this.textOffScale.setVisibility(View.VISIBLE);
return "*" + newValue.toString();
}
break;
}
break;
 
case ITEM_KELVIN:
if (value < 0.0)
{
return TemperaturesActivity.MSG_BELOW_ABS_ZERO;
}
 
switch (itemId2)
{
case ITEM_CELSIUS:
newValue = new Double(value - 273.15);
break;
 
case ITEM_FAHRENHEIT:
newValue = new Double(value * 9.0 / 5 - 459.67);
break;
}
break;
}
 
return newValue.toString();
}
}