Subversion Repositories ES

package de.pointedears.converter.app;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Map.Entry;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

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 android.widget.TableLayout;

import android.widget.TableRow;

import android.widget.TextView;

import de.pointedears.converter.R;

import de.pointedears.converter.db.ConversionData;

import de.pointedears.converter.db.CurrenciesDatabase;

import de.pointedears.converter.helpers.Notifier;

import de.pointedears.converter.helpers.UpdateService;

/**

 * Activity that implements currency conversion

 *

 * @author pelinux

 */

public class CurrenciesActivity extends Activity

{

  /**

   * String to use to indicate that an exchange rate has never been updated

   */

  private static final String TEXT_NEVER = "never";

  /**

   * Serialization version id

   */

  private static final long serialVersionUID = 1L;

  /*

   * 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 database;

  private HashMap<String, ConversionData> conversionRates;

  /**

   * Receiver for intent broadcasts, registered in

   * {@link CurrenciesActivity#onCreate(Bundle)}

   */

  public class UpdateBroadcastReceiver extends BroadcastReceiver

  {

    /**

     * Notification message template

     */

    private static final String EXCHANGE_RATES_UPDATED_TO =

      " exchange rates updated to ";

    /*

     * (non-Javadoc)

     *

     * @see android.content.BroadcastReceiver#onReceive(android.content.Context,

     * android.content.Intent)

     */

    @Override

    public void onReceive(Context context, Intent intent)

    {

      if (intent.getAction().equals(UpdateService.ACTION_UPDATE))

      {

        Bundle extras = intent.getExtras();

        DateFormat df = new SimpleDateFormat("yyyy-MM-dd"); //$NON-NLS-1$

        Notifier.sendMessage(CurrenciesActivity.this,

          extras.get(UpdateService.EXTRA_NUM_RATES)

            + UpdateBroadcastReceiver.EXCHANGE_RATES_UPDATED_TO

            + df.format(extras.get(UpdateService.EXTRA_DATE)));

      }

    }

  }

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

  @Override

  public void onCreate(Bundle savedInstanceState)

  {

    super.onCreate(savedInstanceState);

    this.setContentView(R.layout.activity_currencies);

    UpdateBroadcastReceiver br = new UpdateBroadcastReceiver();

    this.registerReceiver(br, new IntentFilter(UpdateService.ACTION_UPDATE));

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

    this.database = new CurrenciesDatabase(this);

    this.setConversionRates(this.getDatabase().getConversionRates());

    this.fillTableRates();

    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("");

      }

    });

  }

  /**

   * Fills the table with currency conversion rates

   */

  public void fillTableRates()

  {

    TableLayout tableRates =

      (TableLayout) this.findViewById(R.id.currencies_table_rates);

    /* Remove any pre-existing currency rows */

    while (tableRates.getChildCount() > 3)

    {

      tableRates.removeViewAt(3);

    }

    for (Entry<String, ConversionData> factorEntry : this.getConversionRates()

      .entrySet())

    {

      TableRow row = new TableRow(this);

      TextView columnCurrency1 = new TextView(this);

      columnCurrency1.setText(factorEntry.getKey());

      row.addView(columnCurrency1);

      TextView columnRate = new TextView(this);

      final ConversionData conversionData = factorEntry.getValue();

      columnRate.setText(conversionData.getRate().toString());

      row.addView(columnRate);

      TextView columnUpdated = new TextView(this);

      Date updated = conversionData.getUpdated();

      if (updated.getTime() > 0)

      {

        DateFormat df =

          DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM);

        columnUpdated.setText(df.format(updated));

      }

      else

      {

        columnUpdated.setText(CurrenciesActivity.TEXT_NEVER);

      }

      row.addView(columnUpdated);

      tableRates.addView(row);

    }

  }

  /**

   * @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;

    /*

     * NOTE: Had to do it the complicated way because somehow the Android SDK

     * won't get it another way

     */

    ConversionData conversionData1 = null;

    Double factorToEuro = 1.0;

    if (selectedItemValue1 != null)

    {

      conversionData1 = this.getConversionRates().get(selectedItemValue1);

      if (conversionData1 != null)

      {

        factorToEuro = conversionData1.getRate();

      }

    }

    ConversionData conversionData2 = null;

    Double factorFromEuro = 1.0;

    if (selectedItemValue2 != null)

    {

      conversionData2 = this.getConversionRates().get(selectedItemValue2);

      if (conversionData2 != null)

      {

        factorFromEuro = conversionData2.getRate();

      }

    }

    newValue = newValue / factorToEuro * factorFromEuro;

    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)

   */

  @Override

  public boolean onOptionsItemSelected(MenuItem item)

  {

    /* Handle item selection */

    switch (item.getItemId())

    {

      case R.id.item_options_update:

        /*

         * Request the update service to run a thread to fetch the rates from

         * the Web (project requirement)

         */

        Intent intent = new Intent(this, UpdateService.class);

        intent.setAction(UpdateService.ACTION_UPDATE);

        /*

         * FIXME: Not thread-safe!

         * Get the activity context from the intent directly instead

         */

        UpdateService.setActivityContext(this);

        this.startService(intent);

        return true;

      default:

        return super.onOptionsItemSelected(item);

    }

  }

  /**

   * @return the conversionRates

   */

  public HashMap<String, ConversionData> getConversionRates()

  {

    return this.conversionRates;

  }

  /**

   * @param conversionRates

   *          the conversionRates to set

   */

  public void setConversionRates(HashMap<String, ConversionData> conversionRates)

  {

    this.conversionRates = conversionRates;

  }

  /**

   * @return the database

   */

  public CurrenciesDatabase getDatabase()

  {

    return this.database;

  }

}