Android Open Source - Roundr Seek Bar Preference

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License

The source code is released under:

Copyright (C) 2013 Mohammad Adib Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the te...

Java Source Code

package mohammad.adib.roundr;
//ww  w  .  j  a v  a2  s .  co  m
import wei.mark.standout.StandOutWindow;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
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;

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 ROUNDRNS = "roundrprefs";
  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 Context context;

  private TextView mStatusText;

  public SeekBarPreference(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.context = context;
    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(ROUNDRNS, "min", 0);

    mUnitsLeft = getAttributeStringValue(attrs, ROUNDRNS, "unitsLeft", "");
    String units = getAttributeStringValue(attrs, ROUNDRNS, "units", "");
    mUnitsRight = getAttributeStringValue(attrs, ROUNDRNS, "unitsRight", units);

    try {
      String newInterval = attrs.getAttributeValue(ROUNDRNS, "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);
      mStatusText.setText(String.valueOf(pxFromDp(mCurrentValue)));
      mStatusText.setMinimumWidth(30);

      mSeekBar.setProgress(mCurrentValue - mMinValue);

    } catch (Exception e) {
      Log.e(TAG, "Error updating seek bar preference", e);
    }

  }

  private int pxFromDp(double dp) {
    return (int) (dp * context.getResources().getDisplayMetrics().density);
  }

  @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(pxFromDp(newValue)));
    persistInt(newValue);
    // Refresh the corners to apply the new radius
    StandOutWindow.sendData(context, Corner.class, Corner.wildcard, Corner.UPDATE_CODE, new Bundle(), Corner.class, StandOutWindow.DISREGARD_ID);
  }

  @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;
    }

  }

}

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