SeekBarPreference.java

/* The following code was written by Matthew Wiggins 
 * and is released under the APACHE 2.0 license 
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Slightly modified by Alex Burka
 *   - support dependent preference widgets
 *   - correctly track the seekbar value internally
 */
package com.hlidskialf.android.preference;

import android.content.Context;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.TextView;


public class SeekBarPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener
{
  private static final String androidns="http://schemas.android.com/apk/res/android";

  private SeekBar mSeekBar;
  private TextView mSplashText,mValueText;
  private Context mContext;

  private String mDialogMessage, mSuffix;
  private int mDefault, mMax, mValue = 0;

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

    mDialogMessage = attrs.getAttributeValue(androidns,"dialogMessage");
    if(mDialogMessage != null && mDialogMessage.length() > 1 && mDialogMessage.charAt(0) == '@') {
    	int id = Integer.parseInt(mDialogMessage.substring(1));
    	mDialogMessage = context.getString(id);
    }
    mSuffix = attrs.getAttributeValue(androidns,"text");
    mDefault = attrs.getAttributeIntValue(androidns,"defaultValue", 0);
    mMax = attrs.getAttributeIntValue(androidns,"max", 100);

  }
  @Override 
  protected View onCreateDialogView() {
    LinearLayout.LayoutParams params;
    LinearLayout layout = new LinearLayout(mContext);
    layout.setOrientation(LinearLayout.VERTICAL);
    layout.setPadding(6,6,6,6);

    mSplashText = new TextView(mContext);
    if (mDialogMessage != null)
      mSplashText.setText(mDialogMessage);
    layout.addView(mSplashText);

    mValueText = new TextView(mContext);
    mValueText.setGravity(Gravity.CENTER_HORIZONTAL);
    mValueText.setTextSize(32);
    params = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.MATCH_PARENT, 
        LinearLayout.LayoutParams.WRAP_CONTENT);
    layout.addView(mValueText, params);

    mSeekBar = new SeekBar(mContext);
    mSeekBar.setOnSeekBarChangeListener(this);
    layout.addView(mSeekBar, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

    if (shouldPersist())
      mValue = getPersistedInt(mDefault);

    mSeekBar.setMax(mMax);
    mSeekBar.setProgress(mValue);
    return layout;
  }
  
  @Override
  protected void onDialogClosed(boolean positiveResult) {
	  if (positiveResult) {
		  if (shouldPersist()) {
			  mValue = mSeekBar.getProgress();
			  persistInt(mValue);
		  }
		  notifyDependencyChange(shouldDisableDependents());
	  }
  }
  
  @Override 
  protected void onBindDialogView(View v) {
    super.onBindDialogView(v);
    mSeekBar.setMax(mMax);
    mSeekBar.setProgress(mValue);
  }
  @Override
  protected void onSetInitialValue(boolean restore, Object defaultValue)  
  {
    super.onSetInitialValue(restore, defaultValue);
    if (restore) 
      mValue = shouldPersist() ? getPersistedInt(mDefault) : 0;
    else 
      mValue = (Integer)defaultValue;
  }

  public void onProgressChanged(SeekBar seek, int value, boolean fromTouch)
  {
    String t = String.valueOf(value);
    mValueText.setText(mSuffix == null ? t : t.concat(mSuffix));
    if (shouldPersist())
      persistInt(value);
    callChangeListener(Integer.valueOf(value));
  }
  public void onStartTrackingTouch(SeekBar seek) {}
  public void onStopTrackingTouch(SeekBar seek) {}

  public void setMax(int max) { mMax = max; }
  public int getMax() { return mMax; }

  public void setProgress(int progress) { 
    mValue = progress;
    if (mSeekBar != null)
      mSeekBar.setProgress(progress); 
  }
  public int getProgress() { return mValue; }
  
  @Override
  public boolean shouldDisableDependents() {
	  Log.d("SKP", "SDD called, mValue = " + Integer.toString(mValue) + ", super = " + Boolean.toString(super.shouldDisableDependents()));
	  return mValue == 0 || super.shouldDisableDependents();
  }
}