Android SeekBarPreference

Actualmente estoy intentando implementar la clase SeekBarPreference usando http://android-journey.blogspot.com/2010/01/for-almost-any-application-we-need-to.html tutorial con RelativeLayout. El primer problema es TextView preferenciaText no se muestra en absoluto. Segundo problema es la barra no se puede deslizar como los de las preferencias regulares (como la barra de volumen de medios)?

public class SeekBarPreference extends Preference implements OnSeekBarChangeListener { public static int maximum = 100; public static int interval = 5; private float oldValue = 25; private TextView Indicator; 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) { float scale = getContext().getResources().getDisplayMetrics().density; RelativeLayout layout = new RelativeLayout(getContext()); RelativeLayout.LayoutParams textParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); RelativeLayout.LayoutParams sbarParams = new RelativeLayout.LayoutParams( Math.round(scale * 160), RelativeLayout.LayoutParams.WRAP_CONTENT); RelativeLayout.LayoutParams indParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); TextView preferenceText = new TextView(getContext()); preferenceText.setId(0); preferenceText.setText(getTitle()); preferenceText.setTextSize(18); preferenceText.setTypeface(Typeface.SANS_SERIF, Typeface.BOLD); SeekBar sbar = new SeekBar(getContext()); sbar.setId(1); sbar.setMax(maximum); sbar.setProgress((int)this.oldValue); sbar.setOnSeekBarChangeListener(this); this.Indicator = new TextView(getContext()); this.Indicator.setTextSize(12); this.Indicator.setTypeface(Typeface.MONOSPACE, Typeface.ITALIC); this.Indicator.setText("" + sbar.getProgress()); textParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); sbarParams.addRule(RelativeLayout.RIGHT_OF, preferenceText.getId()); indParams.setMargins(Math.round(20*scale), 0, 0, 0); indParams.addRule(RelativeLayout.RIGHT_OF, sbar.getId()); preferenceText.setLayoutParams(textParams); sbar.setLayoutParams(sbarParams); this.Indicator.setLayoutParams(indParams); layout.addView(preferenceText); layout.addView(this.Indicator); layout.addView(sbar); 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.Indicator.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 = ta.getInt(index, 25); return validateValue(dValue); } @Override protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { int temp = restoreValue ? getPersistedInt(25) : (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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 public void onProgressChanged( SeekBar seekBar, int progress, boolean fromUser ) { progress = Math.round( ( (float) progress ) / interval ) * interval; persistInt(progress); callChangeListener( progress ); seekBar.setProgress( progress ); this.monitorBox.setText( progress + "" ); updatePreference( progress ); }