Android Open Source - NotesTrainer Seek Bar Preference

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.robobunny;
//w w  w  .java  2s . co  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.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.RelativeLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

import ydirson.notestrainer.R;

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 ROBOBUNNYNS="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);
  }
  
  private void setValuesFromXml(AttributeSet attrs) {
    mMaxValue = attrs.getAttributeIntValue(ANDROIDNS, "max", 100);
    mMinValue = attrs.getAttributeIntValue(ROBOBUNNYNS, "min", 0);
    
    mUnitsLeft = getAttributeStringValue(attrs, ROBOBUNNYNS, "unitsLeft", "");
    String units = getAttributeStringValue(attrs, ROBOBUNNYNS, "units", "");
    mUnitsRight = getAttributeStringValue(attrs, ROBOBUNNYNS, "unitsRight", units);
    
    try {
      String newInterval = attrs.getAttributeValue(ROBOBUNNYNS, "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){
    
    RelativeLayout layout =  null;
    
    try {
      LayoutInflater mInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

      layout = (RelativeLayout)mInflater.inflate(R.layout.seek_bar_preference, parent, false);
    }
    catch(Exception e)
    {
      Log.e(TAG, "Error creating seek bar preference", e);
    }

    return layout;
    
  }
  
  @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());
    }

    updateView(view);
  }
    
  /**
   * Update a SeekBarPreference view with our current state
   * @param view
   */
  protected void updateView(View view) {

    try {
      RelativeLayout layout = (RelativeLayout)view;

      mStatusText = (TextView)layout.findViewById(R.id.seekBarPrefValue);
      updateStatusText(mStatusText, mCurrentValue);
      mStatusText.setMinimumWidth(30);
      
      mSeekBar.setProgress(mCurrentValue - mMinValue);

      TextView unitsRight = (TextView)layout.findViewById(R.id.seekBarPrefUnitsRight);
      unitsRight.setText(mUnitsRight);
      
      TextView unitsLeft = (TextView)layout.findViewById(R.id.seekBarPrefUnitsLeft);
      unitsLeft.setText(mUnitsLeft);
      
    }
    catch(Exception e) {
      Log.e(TAG, "Error updating seek bar preference", e);
    }
    
  }

  /**
   * Update the status text.  Overridable for customisation.
   */
  protected void updateStatusText(TextView statusText, int value) {
    statusText.setText(String.valueOf(value));
  }

  @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;
    updateStatusText(mStatusText, 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;
    }
    
  }
  
}

Java Source Code List

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