Android Open Source - hacker-live-wallpaper Seek Bar Preference

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License

The source code is released under:

Copyright (C) 2013 Gulshan Singh 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 Soft...

Java Source Code

package com.gulshansingh.hackerlivewallpaper.settings;
//from  w  w  w. j  ava2 s. c om
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.preference.PreferenceManager;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;

import com.gulshansingh.hackerlivewallpaper.R;
import com.gulshansingh.hackerlivewallpaper.Refreshable;

public abstract class SeekBarPreference extends DialogPreference implements
    Refreshable {

  protected int currentVal;

  /** The value the preference could possibly be once the user presses ok */
  protected int possibleVal;

  protected int maxVal = 100;
  protected int minVal = 0;

  protected String key;

  private int defaultVal = 0;

  public SeekBarPreference(Context context, AttributeSet attrs) {
    super(context, attrs);

    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);

    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SeekBarPreference);

    for (int i = 0; i < a.getIndexCount(); i++) {
      int attr = a.getIndex(i);
      switch (attr) {
                case R.styleable.SeekBarPreference_android_key:
                    key = a.getString(attr);
                    break;
                case R.styleable.SeekBarPreference_android_defaultValue:
                    defaultVal = a.getInteger(attr, defaultVal);
                    break;
            }
    }
    a.recycle();

    currentVal = preferences.getInt(key, defaultVal);
    possibleVal = currentVal;

    a = context
        .obtainStyledAttributes(attrs, R.styleable.SeekBarPreference);

    for (int i = 0; i < a.getIndexCount(); i++) {
      int attr = a.getIndex(i);
      switch (attr) {
      case R.styleable.SeekBarPreference_mymin:
        minVal = a.getInteger(R.styleable.SeekBarPreference_mymin,
            minVal);
        break;
      case R.styleable.SeekBarPreference_mymax:
        maxVal = a.getInteger(R.styleable.SeekBarPreference_mymax,
            maxVal);
        break;
      }
    }
    a.recycle();

    // The seek bar must start at 0, so we have to scale max downward
    // and account for this later on
    maxVal -= minVal;

    setDialogLayoutResource(R.layout.preference_dialog_number_picker);
    setPositiveButtonText(android.R.string.ok);
    setNegativeButtonText(android.R.string.cancel);
    setSummary(transform(currentVal));
    setDialogIcon(null);
  }

  @Override
  protected void onDialogClosed(boolean positiveResult) {
    super.onDialogClosed(positiveResult);
    if (positiveResult) {
      if (key != null) {
        currentVal = possibleVal;
        setSummary(transform(currentVal));
        persistInt(currentVal);
      }
    }
  }

  @Override
  public void refresh(Context context) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    currentVal = preferences.getInt(key, defaultVal);
    setSummary(transform(currentVal));
  }

  protected abstract String transform(int value);

  @Override
  protected void onBindDialogView(@NonNull View view) {
    super.onBindDialogView(view);

    SeekBar seekBar = (SeekBar) view.findViewById(R.id.preference_seek_bar);
    seekBar.setMax(maxVal);
    seekBar.setProgress(currentVal - minVal);

    final TextView progressView = (TextView) view
        .findViewById(R.id.preference_seek_bar_progress);
    progressView.setText(transform(currentVal));
    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

      public void onProgressChanged(SeekBar seekBar, int progress,
          boolean fromUser) {
        possibleVal = progress + minVal;
        progressView.setText(transform(possibleVal));
      }

      public void onStartTrackingTouch(SeekBar seekBar) {
      }

      public void onStopTrackingTouch(SeekBar seekBar) {
      }
    });
  }
}

Java Source Code List

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