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8 PointedEar 1
package de.pointedears.converter.app;
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import java.util.HashMap;
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import android.app.Activity;
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import android.os.Bundle;
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import android.text.Editable;
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import android.view.KeyEvent;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.View.OnKeyListener;
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import android.widget.AdapterView;
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import android.widget.AdapterView.OnItemSelectedListener;
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import android.widget.Button;
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import android.widget.EditText;
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import android.widget.Spinner;
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import de.pointedears.converter.R;
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/**
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 * Activity that implements length conversion
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 *
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 * @author pelinux
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 */
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public class LengthsActivity extends Activity
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{
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  /*
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   * Constants for mapping value strings to internal IDs
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   */
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  private static final String VALUE_INCHES = "inch"; //$NON-NLS-1$
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  private static final String VALUE_KILOMETERS = "km"; //$NON-NLS-1$
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  private static final String VALUE_METERS = "m"; //$NON-NLS-1$
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  private static final String VALUE_MILES = "mi"; //$NON-NLS-1$
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  private static final int ITEM_INCHES = 0;
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  private static final int ITEM_KILOMETERS = 1;
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  private static final int ITEM_METERS = 2;
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  private static final int ITEM_MILES = 3;
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  /**
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   * Maps value strings to internal IDs
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   */
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  private final static HashMap<String, Integer> valueToId =
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    new HashMap<String, Integer>();
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  static
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  {
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    LengthsActivity.valueToId.put(LengthsActivity.VALUE_INCHES,
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      LengthsActivity.ITEM_INCHES);
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    LengthsActivity.valueToId.put(LengthsActivity.VALUE_KILOMETERS,
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      LengthsActivity.ITEM_KILOMETERS);
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    LengthsActivity.valueToId.put(LengthsActivity.VALUE_METERS,
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      LengthsActivity.ITEM_METERS);
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    LengthsActivity.valueToId.put(LengthsActivity.VALUE_MILES,
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      LengthsActivity.ITEM_MILES);
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  }
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  /* Unit spinners (dropdowns) */
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  private Spinner spinnerUnit1;
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  private Spinner spinnerUnit2;
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  /** Called when the activity is first created. */
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  @Override
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  public void onCreate(Bundle savedInstanceState)
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  {
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    super.onCreate(savedInstanceState);
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    this.setContentView(R.layout.activity_lengths);
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    final EditText editValue1 = (EditText) this.findViewById(R.id.edit_value1);
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    final EditText editValue2 = (EditText) this.findViewById(R.id.edit_value2);
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    final OnKeyListener editValue1OnKey = new OnKeyListener() {
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      @Override
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      public boolean onKey(View v, int keyCode, KeyEvent event)
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      {
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        Editable editable1 = ((EditText) v).getText();
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        Double value1;
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        try
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        {
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          value1 = Double.parseDouble(editable1.toString());
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        }
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        catch (NumberFormatException e)
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        {
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          value1 = null;
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        }
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        String string2 = ""; //$NON-NLS-1$
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        if (value1 != null)
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        {
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          string2 = LengthsActivity.this.getConvertedValue(value1, false);
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        }
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        editValue2.setText(string2);
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        return false;
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      }
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    };
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    editValue1.setOnKeyListener(editValue1OnKey);
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    final OnKeyListener editValue2OnKey = new OnKeyListener() {
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      @Override
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      public boolean onKey(View v, int keyCode, KeyEvent event)
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      {
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        Editable editable2 = ((EditText) v).getText();
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        Double value2;
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        try
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        {
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          value2 = Double.parseDouble(editable2.toString());
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        }
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        catch (NumberFormatException e)
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        {
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          value2 = null;
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        }
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        String string1 = ""; //$NON-NLS-1$
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        if (value2 != null)
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        {
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          string1 = LengthsActivity.this.getConvertedValue(value2, true);
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        }
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        editValue1.setText(string1);
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        return false;
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      }
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    };
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    editValue2.setOnKeyListener(editValue2OnKey);
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    this.spinnerUnit1 = (Spinner) this.findViewById(R.id.spinner_unit1);
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    this.spinnerUnit2 = (Spinner) this.findViewById(R.id.spinner_unit2);
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    this.spinnerUnit1.setOnItemSelectedListener(new OnItemSelectedListener() {
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      @Override
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      public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
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        long arg3)
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      {
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        /* Simulate input in second EditText so that first EditText is updated */
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        editValue2OnKey.onKey(editValue2, 0, null);
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      }
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      @Override
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      public void onNothingSelected(AdapterView<?> arg0)
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      {
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        /* no-op */
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      }
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    });
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    this.spinnerUnit2.setSelection(1);
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    this.spinnerUnit2.setOnItemSelectedListener(new OnItemSelectedListener() {
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      @Override
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      public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
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        long arg3)
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      {
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        /* Simulate input in first EditText so that second EditText is updated */
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        editValue1OnKey.onKey(editValue1, 0, null);
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      }
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157
      @Override
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      public void onNothingSelected(AdapterView<?> arg0)
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      {
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        /* no-op */
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      }
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    });
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    Button buttonClear =
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      (Button) this.findViewById(R.id.lengths_button_clear);
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    buttonClear.setOnClickListener(new OnClickListener() {
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168
      @SuppressWarnings("nls")
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      @Override
170
      public void onClick(View v)
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      {
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        editValue1.setText("");
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        editValue2.setText("");
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      }
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    });
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  }
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  /**
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   * @param value
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   * @return
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   */
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  private String getConvertedValue(double value, boolean reverse)
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  {
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    int selectedItemPosition1 = this.spinnerUnit1.getSelectedItemPosition();
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    int selectedItemPosition2 = this.spinnerUnit2.getSelectedItemPosition();
186
    String[] itemArray =
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      this.getResources().getStringArray(R.array.length_units_values);
188
    String selectedItemValue1 = itemArray[selectedItemPosition1];
189
    String selectedItemValue2 = itemArray[selectedItemPosition2];
190
 
191
    if (reverse)
192
    {
193
      String tmp = selectedItemValue1;
194
      selectedItemValue1 = selectedItemValue2;
195
      selectedItemValue2 = tmp;
196
    }
197
 
198
    int itemId1 = LengthsActivity.valueToId.get(selectedItemValue1);
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    int itemId2 = LengthsActivity.valueToId.get(selectedItemValue2);
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    Double newValue = value;
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203
    switch (itemId1)
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    {
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      case ITEM_INCHES:
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        switch (itemId2)
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        {
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          case ITEM_KILOMETERS:
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            /* see ITEM_METERS */
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            newValue = new Double((value * 0.0254) / 1000);
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            break;
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          case ITEM_METERS:
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            newValue = new Double(value * 0.0254);
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            break;
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          case ITEM_MILES:
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            /* 12 in/ft and 5280 ft/mi */
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            newValue = new Double(value / 12 / 5280);
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            break;
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        }
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        break;
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      case ITEM_KILOMETERS:
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        switch (itemId2)
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        {
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          case ITEM_INCHES:
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            /* 1 m = 39.370 in */
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            newValue = new Double(value * 1000 * 39.370);
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            break;
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232
          case ITEM_METERS:
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            newValue = new Double(value * 1000);
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            break;
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236
          case ITEM_MILES:
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            newValue = new Double(value / 1.609344);
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            break;
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        }
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        break;
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242
      case ITEM_METERS:
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        switch (itemId2)
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        {
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          case ITEM_INCHES:
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            /* 1 m = 39.370 in */
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            newValue = new Double(value * 39.370);
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            break;
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          case ITEM_KILOMETERS:
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            newValue = new Double(value / 1000);
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            break;
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          case ITEM_MILES:
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            /* 1 mi = 1609.344 m */
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            newValue = new Double(value / 1609.344);
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            break;
258
        }
259
        break;
260
 
261
      case ITEM_MILES:
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        switch (itemId2)
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        {
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          case ITEM_INCHES:
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            /* 1 mi = 5280 ft, 1 ft = 12 in */
266
            newValue = new Double(value * 5280 * 12);
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            break;
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269
          case ITEM_KILOMETERS:
270
            newValue = new Double(value * 1.609344);
271
            break;
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273
          case ITEM_METERS:
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            newValue = new Double(value * 1609.344);
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            break;
276
        }
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        break;
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    }
279
 
280
    return newValue.toString();
281
  }
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}