package de.pointedears.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.OnClickListener; import android.view.View.OnKeyListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.Button; import android.widget.EditText; import android.widget.Spinner; import android.widget.TextView; import de.pointedears.converter.R; /** * Activity that implements length conversion * * @author pelinux */ public class TemperaturesActivity extends Activity { /* * 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 valueToId = new HashMap(); /* 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 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.activity_temperatures); this.textOffScale = (TextView) this.findViewById(R.id.temperatures_text_off_scale); final EditText editValue1 = (EditText) this.findViewById(R.id.temperatures_edit_value1); final EditText editValue2 = (EditText) this.findViewById(R.id.temperatures_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 = 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 */ } }); Button buttonClear = (Button) this.findViewById(R.id.temperatures_button_clear); buttonClear.setOnClickListener(new OnClickListener() { @SuppressWarnings("nls") @Override public void onClick(View v) { editValue1.setText(""); editValue2.setText(""); } }); } /** * @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(); //$NON-NLS-1$ } 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(); //$NON-NLS-1$ } break; } break; case ITEM_KELVIN: 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; } if (value < 0.0) { this.textOffScale.setVisibility(View.VISIBLE); return "*" + newValue.toString(); //$NON-NLS-1$ } break; } return newValue.toString(); } }