Subversion Repositories ES

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.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

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 de.pointedears.converter.R;

import de.pointedears.converter.db.CurrenciesDatabase;

/**

 * Activity that implements currency conversion

 *

 * @author pelinux

 */

public class CurrenciesActivity extends Activity

{

  /*

   * Constants for mapping value strings

   *

   * @todo: Use resource IDs

   */

  /**

   * Database field/spinner value for Swiss Francs

   */

  public static final String VALUE_CHF = "CHF"; //$NON-NLS-1$

  /**

   * Database field/spinner value for Euros

   */

  public static final String VALUE_EUR = "EUR"; //$NON-NLS-1$

  /**

   * Database field/spinner value for US Dollars

   */

  public static final String VALUE_USD = "USD"; //$NON-NLS-1$

  /* Unit spinners (dropdowns) */

  private Spinner spinnerUnit1;

  private Spinner spinnerUnit2;

  private CurrenciesDatabase db;

  private HashMap<String, HashMap<String, Double>> conversionRates;

  /** Called when the activity is first created. */

  @Override

  public void onCreate(Bundle savedInstanceState)

  {

    super.onCreate(savedInstanceState);

    this.setContentView(R.layout.activity_currencies);

    /* Set up currency database, and retrieve conversion rates */

    this.db = new CurrenciesDatabase(this);

    this.conversionRates = this.db.getConversionRates();

    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 */

      }

    });

    Button buttonClear =

      (Button) this.findViewById(R.id.currencies_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[] items =

      this.getResources().getStringArray(R.array.currency_units_values);

    String selectedItemValue1 = items[selectedItemPosition1];

    String selectedItemValue2 = items[selectedItemPosition2];

    if (reverse)

    {

      String tmp = selectedItemValue1;

      selectedItemValue1 = selectedItemValue2;

      selectedItemValue2 = tmp;

    }

    Double newValue = value;

    HashMap<String, Double> mapForCurrency =

      this.conversionRates.get(selectedItemValue1);

    if (mapForCurrency != null)

    {

      Double conversionFactor = mapForCurrency.get(selectedItemValue2);

      if (conversionFactor != null)

      {

        newValue *= conversionFactor;

      }

    }

    return newValue.toString();

  }

  /*

   * (non-Javadoc)

   *

   * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)

   */

  /*

   * (non-Javadoc)

   *

   * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)

   */

  @Override

  public boolean onCreateOptionsMenu(Menu menu)

  {

    MenuInflater inflater = this.getMenuInflater();

    inflater.inflate(R.menu.options, menu);

    return true;

  }

  /*

   * (non-Javadoc)

   *

   * @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)

   */

  /*

   * (non-Javadoc)

   *

   * @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)

   */

  @Override

  public boolean onOptionsItemSelected(MenuItem item)

  {

    /* update here */

    return super.onOptionsItemSelected(item);

  }

}