Android Open Source - android-binarual-beats-generator Seek Bar Preference

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License

The source code is released under:

GNU General Public License

Java Source Code

/*******************************************************************************
 * Copyright (c) 2010 Robert Bermani./*  www .  ja  va  2 s .  c  o m*/
 * All rights reserved. This program and its accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which is included with this distribution and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Robert Bermani - initial API and implementation
 ******************************************************************************/
package rbermani.android.widgets;

import rbermani.android.binaural.R;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class SeekBarPreference extends Preference 
implements OnSeekBarChangeListener{


  public static int maximum    = 100;
  public static int interval   = 1;

  private float oldValue = 50;
  private TextView monitorBox;


  public SeekBarPreference(Context context) {
    super(context);
  }

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

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

  @Override
  protected View onCreateView(ViewGroup parent){
    LinearLayout layout = new LinearLayout(getContext());

    LinearLayout.LayoutParams descText = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.WRAP_CONTENT,
        LayoutParams.WRAP_CONTENT);
    descText.gravity = Gravity.LEFT;
    descText.weight  = 1.0f;


    LinearLayout.LayoutParams sliderBar = new LinearLayout.LayoutParams(
        150,
        LayoutParams.WRAP_CONTENT);
    sliderBar.gravity = Gravity.RIGHT;


    LinearLayout.LayoutParams sliderVal = new LinearLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT,
        LayoutParams.WRAP_CONTENT);
    sliderVal.gravity = Gravity.CENTER;

    layout.setPadding(15, 5, 10, 5);
    layout.setOrientation(LinearLayout.HORIZONTAL);

    TextView view = new TextView(getContext());
    view.setText(getTitle());
    view.setTextSize(14);
    view.setTypeface(Typeface.SANS_SERIF, Typeface.BOLD);
    view.setGravity(Gravity.LEFT);
    view.setLayoutParams(descText);
    view.setPadding(0, 0, 5, 0);


    SeekBar bar = new SeekBar(getContext());
    bar.setMax(maximum);
    bar.setProgress((int)this.oldValue);
    bar.setLayoutParams(sliderBar);
    bar.setOnSeekBarChangeListener(this);
    bar.setPadding(0, 0, 5, 0);
    
    this.monitorBox = new TextView(getContext());
    this.monitorBox.setTextSize(12);
    this.monitorBox.setTypeface(Typeface.MONOSPACE, Typeface.ITALIC);
    this.monitorBox.setLayoutParams(sliderVal);
    this.monitorBox.setPadding(0, 5, 5, 0);
    
    this.monitorBox.setText(bar.getProgress()+"");


    layout.addView(view);
    layout.addView(bar);
    layout.addView(this.monitorBox);
    layout.setId(android.R.id.widget_frame);


    return layout; 

  }

  @Override
  public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {

    progress = Math.round(((float)progress)/interval)*interval;

    if(!callChangeListener(progress)){
      seekBar.setProgress((int)this.oldValue); 
      return; 
    }

    seekBar.setProgress(progress);
    this.oldValue = progress;
    this.monitorBox.setText(progress+"");
    updatePreference(progress);

    notifyChanged();
  }

  @Override
  public void onStartTrackingTouch(SeekBar seekBar) {
  }

  @Override
  public void onStopTrackingTouch(SeekBar seekBar) {
  }


  @Override 
  protected Object onGetDefaultValue(TypedArray ta,int index){

    int dValue = (int)ta.getInt(index,50);

    return validateValue(dValue);
  }


  @Override
  protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {

    int temp = restoreValue ? getPersistedInt(50) : (Integer)defaultValue;

    if(!restoreValue)
      persistInt(temp);

    this.oldValue = temp;
  }


  private int validateValue(int value){

    if(value > maximum)
      value = maximum;
    else if(value < 0)
      value = 0;
    else if(value % interval != 0)
      value = Math.round(((float)value)/interval)*interval;  


    return value;  
  }


  private void updatePreference(int newValue){

    SharedPreferences.Editor editor =  getEditor();
    editor.putInt(getKey(), newValue);
    editor.commit();
  }

}

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