TemperaturePreference.java :  » App » gasmixer » divestoclimb » gasmixer » Android Open Source

package divestoclimb.gasmixer;

import java.text.NumberFormat;
import java.text.ParseException;

import divestoclimb.lib.scuba.Units;
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.view.View;

public class TemperaturePreference extends NumberPreference {
  
  private Units mUnits;

  public TemperaturePreference(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    setUnits();
  }
  
  // Not sure if I need these overrides...
  public TemperaturePreference(Context context, AttributeSet attrs) {
    this(context, attrs, android.R.attr.dialogPreferenceStyle);
  }
  
  public TemperaturePreference(Context context) {
    this(context, null);
  }
  
  protected void setUnits() {
    SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(getContext());
    int unit;
    // Android issue 2096 - ListPreference won't work with an integer
    // array for values. Unit values are being stored as Strings then
    // we convert them here for use.
    try {
      unit = NumberFormat.getIntegerInstance().parse(settings.getString("units", "0")).intValue();
    } catch(ParseException e) { unit = 0; }
    mUnits = new Units(unit);
  }

  @Override
  public void setValue(float value) {
    // Value comes in as a relative temperature in the current unit
    // system. Convert it to Kelvin.
    super.setValue(Units.convertAbsTemp(mUnits.tempRelToAbs(value), mUnits.getCurrentSystem(), Units.METRIC));
  }

  @Override
  public float getValue() {
    // The superclass getValue() will return a temperature in Kelvin.
    // Convert it to a relative temperaute in the current unit system.
    return mUnits.tempAbsToRel(mUnits.convertAbsTemp(super.getValue(), Units.METRIC));
  }
  
  @Override
  protected void onBindDialogView(View view) {
    setUnits();
    mUnitLabel.setText(
        getContext().getString(mUnits.relTempUnit() == Units.IMPERIAL?
            R.string.reltemp_imperial:
              R.string.reltemp_metric)
    + ":");
    super.onBindDialogView(view);
  }
}