Android Open Source - MediaButtonOverlay Seek Bar Preference

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Back to project page MediaButtonOverlay.
License

The source code is released under:
GNU Lesser General Public License
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Java Source Code

package com.robobunny;
import com.mikekorcha.mediabuttonoverlay.R;
/*from  w w  w.  java2 s  .c o m*/
import android.content.Context;
import android.content.res.TypedArray;
import android.preference.Preference;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class SeekBarPreference extends Preference implements OnSeekBarChangeListener {
  
  private final String TAG = getClass().getName();
  
  private static final String ANDROIDNS="http://schemas.android.com/apk/res/android";
  private static final String APPLICATIONNS="http://robobunny.com";
  private static final int DEFAULT_VALUE = 50;
  
  private int mMaxValue      = 100;
  private int mMinValue      = 0;
  private int mInterval      = 1;
  private int mCurrentValue;
  private String mUnitsLeft  = "";
  private String mUnitsRight = "";
  private SeekBar mSeekBar;
  
  private TextView mStatusText;

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

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

  private void initPreference(Context context, AttributeSet attrs) {
    setValuesFromXml(attrs);
    mSeekBar = new SeekBar(context, attrs);
    mSeekBar.setMax(mMaxValue - mMinValue);
    mSeekBar.setOnSeekBarChangeListener(this);
    
    setWidgetLayoutResource(R.layout.seek_bar_preference);
  }
  
  private void setValuesFromXml(AttributeSet attrs) {
    mMaxValue = attrs.getAttributeIntValue(ANDROIDNS, "max", 100);
    mMinValue = attrs.getAttributeIntValue(APPLICATIONNS, "min", 0);
    
    mUnitsLeft = getAttributeStringValue(attrs, APPLICATIONNS, "unitsLeft", "");
    String units = getAttributeStringValue(attrs, APPLICATIONNS, "units", "");
    mUnitsRight = getAttributeStringValue(attrs, APPLICATIONNS, "unitsRight", units);
    
    try {
      String newInterval = attrs.getAttributeValue(APPLICATIONNS, "interval");
      if(newInterval != null)
        mInterval = Integer.parseInt(newInterval);
    }
    catch(Exception e) {
      Log.e(TAG, "Invalid interval value", e);
    }
    
  }
  
  private String getAttributeStringValue(AttributeSet attrs, String namespace, String name, String defaultValue) {
    String value = attrs.getAttributeValue(namespace, name);
    if(value == null)
      value = defaultValue;
    
    return value;
  }
  
  @Override
  protected View onCreateView(ViewGroup parent) {
    View view = super.onCreateView(parent);
    
    // The basic preference layout puts the widget frame to the right of the title and summary,
    // so we need to change it a bit - the seekbar should be under them.
    LinearLayout layout = (LinearLayout) view;
    layout.setOrientation(LinearLayout.VERTICAL);
    
    return view;
  }
  
  @Override
  public void onBindView(View view) {
    super.onBindView(view);

    try {
      // move our seekbar to the new view we've been given
      ViewParent oldContainer = mSeekBar.getParent();
      ViewGroup newContainer = (ViewGroup) view.findViewById(R.id.seekBarPrefBarContainer);
      
      if (oldContainer != newContainer) {
        // remove the seekbar from the old view
        if (oldContainer != null) {
          ((ViewGroup) oldContainer).removeView(mSeekBar);
        }
        // remove the existing seekbar (there may not be one) and add ours
        newContainer.removeAllViews();
        newContainer.addView(mSeekBar, ViewGroup.LayoutParams.FILL_PARENT,
        ViewGroup.LayoutParams.WRAP_CONTENT);
      }
    }
    catch(Exception ex) {
      Log.e(TAG, "Error binding view: " + ex.toString());
    }
    
    //if dependency is false from the beginning, disable the seek bar
    if (view != null && !view.isEnabled())
    {
      mSeekBar.setEnabled(false);
    }
    
    updateView(view);
  }
    
      /**
   * Update a SeekBarPreference view with our current state
   * @param view
   */
  protected void updateView(View view) {

    try {
      mStatusText = (TextView) view.findViewById(R.id.seekBarPrefValue);

      mStatusText.setText(String.valueOf(mCurrentValue));
      mStatusText.setMinimumWidth(30);
      
      mSeekBar.setProgress(mCurrentValue - mMinValue);

      TextView unitsRight = (TextView)view.findViewById(R.id.seekBarPrefUnitsRight);
      unitsRight.setText(mUnitsRight);
      
      TextView unitsLeft = (TextView)view.findViewById(R.id.seekBarPrefUnitsLeft);
      unitsLeft.setText(mUnitsLeft);
      
    }
    catch(Exception e) {
      Log.e(TAG, "Error updating seek bar preference", e);
    }
    
  }
  
  @Override
  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    int newValue = progress + mMinValue;
    
    if(newValue > mMaxValue)
      newValue = mMaxValue;
    else if(newValue < mMinValue)
      newValue = mMinValue;
    else if(mInterval != 1 && newValue % mInterval != 0)
      newValue = Math.round(((float)newValue)/mInterval)*mInterval;  
    
    // change rejected, revert to the previous value
    if(!callChangeListener(newValue)){
      seekBar.setProgress(mCurrentValue - mMinValue); 
      return; 
    }

    // change accepted, store it
    mCurrentValue = newValue;
    mStatusText.setText(String.valueOf(newValue));
    persistInt(newValue);

  }

  @Override
  public void onStartTrackingTouch(SeekBar seekBar) {}

  @Override
  public void onStopTrackingTouch(SeekBar seekBar) {
    notifyChanged();
  }


  @Override 
  protected Object onGetDefaultValue(TypedArray ta, int index){
    
    int defaultValue = ta.getInt(index, DEFAULT_VALUE);
    return defaultValue;
    
  }

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

    if(restoreValue) {
      mCurrentValue = getPersistedInt(mCurrentValue);
    }
    else {
      int temp = 0;
      try {
        temp = (Integer)defaultValue;
      }
      catch(Exception ex) {
        Log.e(TAG, "Invalid default value: " + defaultValue.toString());
      }
      
      persistInt(temp);
      mCurrentValue = temp;
    }
    
  }
  
  /**
  * make sure that the seekbar is disabled if the preference is disabled
  */
  @Override
  public void setEnabled(boolean enabled) {
    super.setEnabled(enabled);
    mSeekBar.setEnabled(enabled);
  }
  
  @Override
  public void onDependencyChanged(Preference dependency, boolean disableDependent) {
    super.onDependencyChanged(dependency, disableDependent);
    
    //Disable movement of seek bar when dependency is false
    if (mSeekBar != null)
    {
      mSeekBar.setEnabled(!disableDependent);
    }
  }
}
Java Source Code List
