Android Open Source - speedofsound Slider Preference

From Project

Back to project page speedofsound.
License

The source code is released under:
GNU General Public License
If you think the Android project speedofsound listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package net.codechunk.speedofsound.util;
// ww  w.ja  v a 2s .  c om
import android.content.Context;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

import net.codechunk.speedofsound.R;

/**
 * A preference that is displayed as a seek bar.
 */
public class SliderPreference extends DialogPreference implements OnSeekBarChangeListener {
  /**
   * Our custom namespace for this preference.
   */
  protected static final String LOCAL_NS = "http://schemas.android.com/apk/res/net.codechunk.speedofsound";

  /**
   * Current context.
   */
  protected Context context;

  /**
   * Seek bar widget to control preference value.
   */
  protected SeekBar seekBar;

  /**
   * Text view displaying the value of the seek bar.
   */
  protected TextView valueDisplay;

  /**
   * Dialog view.
   */
  protected View view;

  /**
   * Minimum value.
   */
  protected final int minValue;

  /**
   * Maximum value.
   */
  protected final int maxValue;

  /**
   * Units of this preference.
   */
  protected String units;

  /**
   * Current value.
   */
  protected int value;

  /**
   * Create a new slider preference.
   *
   * @param context Context to use
   * @param attrs   XML attributes to load
   */
  public SliderPreference(Context context, AttributeSet attrs) {
    super(context, attrs);

    this.context = context;
    this.minValue = attrs.getAttributeIntValue(LOCAL_NS, "minValue", 0);
    this.maxValue = attrs.getAttributeIntValue(LOCAL_NS, "maxValue", 0);
    this.units = attrs.getAttributeValue(LOCAL_NS, "units");
  }

  /**
   * Set the initial value.
   * Needed to properly load the default value.
   */
  @Override
  protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValue) {
    if (restorePersistedValue) {
      // Restore existing state
      this.value = this.getPersistedInt(-1);
    } else {
      // Set default state from the XML attribute
      this.value = (Integer) defaultValue;
      persistInt(this.value);
    }
  }

  /**
   * Support loading a default value.
   */
  @Override
  protected Object onGetDefaultValue(TypedArray a, int index) {
    return a.getInteger(index, -1);
  }

  /**
   * Set up the preference display.
   */
  @Override
  protected View onCreateDialogView() {
    // reload the persisted value since onSetInitialValue is only performed once
    // for the activity, not each time the preference is opened
    this.value = getPersistedInt(-1);

    // load the layout
    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.view = inflater.inflate(R.layout.slider_preference_dialog, null);

    // setup the slider
    this.seekBar = (SeekBar) view.findViewById(R.id.slider_preference_seekbar);
    this.seekBar.setMax(this.maxValue - this.minValue);
    this.seekBar.setProgress(this.value - this.minValue);
    this.seekBar.setOnSeekBarChangeListener(this);

    this.valueDisplay = (TextView) this.view.findViewById(R.id.slider_preference_value);
    this.updateDisplay();

    return this.view;
  }

  /**
   * Save on dialog close.
   */
  @Override
  protected void onDialogClosed(boolean positiveResult) {
    super.onDialogClosed(positiveResult);

    if (!positiveResult) {
      return;
    }

    if (shouldPersist()) {
      this.persistInt(this.value);
    }

    this.notifyChanged();
  }

  protected void updateDisplay() {
    String text = Integer.toString(this.value);
    if (this.units != null) {
      text += this.units;
    }
    this.valueDisplay.setText(text);
  }

  /**
   * Updated the displayed value on change.
   */
  public void onProgressChanged(SeekBar seekBar, int value, boolean fromTouch) {
    this.value = value + this.minValue;
    this.updateDisplay();
  }

  public void onStartTrackingTouch(SeekBar sb) {
  }

  public void onStopTrackingTouch(SeekBar sb) {
  }

}
Java Source Code List
