Android Open Source - TronWallpaper Color Preference

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License

The source code is released under:

Apache License

Java Source Code

package com.jakewharton.utilities;
//from  w  ww.  java 2 s .  c  om
import com.jakewharton.tronwallpaper.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.SurfaceView;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;

/**
 * Preference for picking a color which is persisted as an integer.
 * 
 * @author Jake Wharton
 */
public class ColorPreference extends DialogPreference {
  /**
   * Since we do not allow changing the alpha value, always use the maximum value of 255.
   */
  private static final int ALPHA = 0xff;
  
  
  
  /**
   * Color preview at top of dialog.
   */
  private SurfaceView mPreview;
  
  /**
   * Seek bar for the red color part.
   */
  private SeekBar mR;
  
  /**
   * Seek bar for the green color part.
   */
  private SeekBar mG;
  
  /**
   * Seek bar for the blue color part.
   */
  private SeekBar mB;
  
  /**
   * Value of the red seek bar.
   */
  private TextView mRValue;
  
  /**
   * Value of the green seek bar.
   */
  private TextView mGValue;
  
  /**
   * Value of the blue seek bar.
   */
  private TextView mBValue;
  
  /**
   * The color.
   */
  private int mColor;
  
  /**
   * Temporary color storage used for callback.
   */
  private Integer mTempColor;
  
  /**
   * Listener for any of the seek bar value changes.
   */
  private final OnSeekBarChangeListener mSeekBarChangeListener = new OnSeekBarChangeListener() {
    public void onStopTrackingTouch(SeekBar seekBar) {}
    public void onStartTrackingTouch(SeekBar seekBar) {}
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
      final int red = ColorPreference.this.mR.getProgress();
      final int green = ColorPreference.this.mG.getProgress();
      final int blue = ColorPreference.this.mB.getProgress();
      final int color = Color.argb(ColorPreference.ALPHA, red, green, blue);
      
      ColorPreference.this.mRValue.setText(Integer.toString(red));
      ColorPreference.this.mGValue.setText(Integer.toString(green));
      ColorPreference.this.mBValue.setText(Integer.toString(blue));
      
      ColorPreference.this.setValue(color);
    }
  };

  
  
  /**
   * Create a new instance of the ColorPreference.
   * 
   * @param context Context.
   * @param attrs Attributes.
   */
  public ColorPreference(final Context context, final AttributeSet attrs) {
    super(context, attrs);
    
    this.setPersistent(true);
    this.setDialogLayoutResource(R.layout.color_preference);
  }
  
  
  
  @Override
  protected void onBindDialogView(final View view) {
    super.onBindDialogView(view);
    
    this.mPreview = (SurfaceView)view.findViewById(R.id.preview);
    this.mPreview.setBackgroundColor(this.mColor);
    
    this.mR = (SeekBar)view.findViewById(R.id.red);
    this.mR.setProgress(Color.red(this.mColor));
    this.mR.setOnSeekBarChangeListener(this.mSeekBarChangeListener);
    this.mG = (SeekBar)view.findViewById(R.id.green);
    this.mG.setProgress(Color.green(this.mColor));
    this.mG.setOnSeekBarChangeListener(this.mSeekBarChangeListener);
    this.mB = (SeekBar)view.findViewById(R.id.blue);
    this.mB.setProgress(Color.blue(this.mColor));
    this.mB.setOnSeekBarChangeListener(this.mSeekBarChangeListener);
    
    this.mRValue = (TextView)view.findViewById(R.id.red_value);
    this.mRValue.setText(Integer.toString(Color.red(this.mColor)));
    this.mGValue = (TextView)view.findViewById(R.id.green_value);
    this.mGValue.setText(Integer.toString(Color.green(this.mColor)));
    this.mBValue = (TextView)view.findViewById(R.id.blue_value);
    this.mBValue.setText(Integer.toString(Color.blue(this.mColor)));
  }

  @Override
  protected Object onGetDefaultValue(final TypedArray a, final int index) {
    return a.getInt(index, 0);
  }

  @Override
  protected void onSetInitialValue(final boolean restore, final Object defaultValue) {
    final int color = this.getPersistedInt(defaultValue == null ? 0 : (Integer)defaultValue);
    this.mColor = color;
  }

  @Override
  protected void onDialogClosed(final boolean positiveResult) {
    super.onDialogClosed(positiveResult);

    if (positiveResult) {
      this.mTempColor = this.mColor;
      if (this.callChangeListener(this.mTempColor)) {
        this.saveValue(this.mTempColor);
      }
    }
  }

  /**
   * Set the value of the color and update the preview.
   * 
   * @param color Color value.
   */
  public void setValue(final int color) {
    this.mColor = color;
    this.mPreview.setBackgroundColor(color);
  }
  
  /**
   * Set and persist the value of the color.
   * 
   * @param color Color value.
   */
  public void saveValue(final int color) {
    this.setValue(color);
    this.persistInt(color);
  }
}

Java Source Code List

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