Android Open Source - AndroidSliderPreference Slider Preference

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License

The source code is released under:

Copyright 2012 Jay Weisskopf Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software...

Java Source Code

/*
 * Copyright 2012 Jay Weisskopf// w ww  . ja  v  a 2  s.c  o  m
 *
 * Licensed under the MIT License (see LICENSE.txt)
 */

package net.jayschwa.android.preference;

import android.content.Context;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SeekBar;

/**
 * @author Jay Weisskopf
 */
public class SliderPreference extends DialogPreference {

  protected final static int SEEKBAR_RESOLUTION = 10000;

  protected float mValue;
  protected int mSeekBarValue;
  protected CharSequence[] mSummaries;

  /**
   * @param context
   * @param attrs
   */
  public SliderPreference(Context context, AttributeSet attrs) {
    super(context, attrs);
    setup(context, attrs);
  }

  /**
   * @param context
   * @param attrs
   * @param defStyle
   */
  public SliderPreference(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    setup(context, attrs);
  }

  private void setup(Context context, AttributeSet attrs) {
    setDialogLayoutResource(R.layout.slider_preference_dialog);
    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SliderPreference);
    try {
      setSummary(a.getTextArray(R.styleable.SliderPreference_android_summary));
    } catch (Exception e) {
      // Do nothing
    }
    a.recycle();
  }

  @Override
  protected Object onGetDefaultValue(TypedArray a, int index) {
    return a.getFloat(index, 0);
  }

  @Override
  protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
    setValue(restoreValue ? getPersistedFloat(mValue) : (Float) defaultValue);
  }

  @Override
  public CharSequence getSummary() {
    if (mSummaries != null && mSummaries.length > 0) {
      int index = (int) (mValue * mSummaries.length);
      index = Math.min(index, mSummaries.length - 1);
      return mSummaries[index];
    } else {
      return super.getSummary();
    }
  }

  public void setSummary(CharSequence[] summaries) {
    mSummaries = summaries;
  }

  @Override
  public void setSummary(CharSequence summary) {
    super.setSummary(summary);
    mSummaries = null;
  }

  @Override
  public void setSummary(int summaryResId) {
    try {
      setSummary(getContext().getResources().getStringArray(summaryResId));
    } catch (Exception e) {
      super.setSummary(summaryResId);
    }
  }

  public float getValue() {
    return mValue;
  }

  public void setValue(float value) {
    value = Math.max(0, Math.min(value, 1)); // clamp to [0, 1]
    if (shouldPersist()) {
      persistFloat(value);
    }
    if (value != mValue) {
      mValue = value;
      notifyChanged();
    }
  }

  @Override
  protected View onCreateDialogView() {
    mSeekBarValue = (int) (mValue * SEEKBAR_RESOLUTION);
    View view = super.onCreateDialogView();
    SeekBar seekbar = (SeekBar) view.findViewById(R.id.slider_preference_seekbar);
    seekbar.setMax(SEEKBAR_RESOLUTION);
    seekbar.setProgress(mSeekBarValue);
    seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {
      }

      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {
      }

      @Override
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if (fromUser) {
          SliderPreference.this.mSeekBarValue = progress;
        }
      }
    });
    return view;
  }

  @Override
  protected void onDialogClosed(boolean positiveResult) {
    final float newValue = (float) mSeekBarValue / SEEKBAR_RESOLUTION;
    if (positiveResult && callChangeListener(newValue)) {
      setValue(newValue);
    }
    super.onDialogClosed(positiveResult);
  }

  // TODO: Save and restore preference state.
}

Java Source Code List

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