Android Open Source - BreakoutWallpaper Number Preference

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License

The source code is released under:

Apache License

Java Source Code

package com.jakewharton.utilities;
//w  w  w  . jav a 2  s.  c  o  m
import com.jakewharton.breakoutwallpaper.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;

/**
 * Preference which displays a seek bar for the selection of an integer.
 * 
 * @author Jake Wharton
 */
public class NumberPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener {
  /**
   * The seek bar.
   */
  private SeekBar mSeekBar;
  
  /**
   * Representation of the value.
   */
  private TextView mValueText;
  
  /**
   * A suffix to append to the value for display.
   */
  private String mSuffix;
  
  /**
   * Maximum value.
   */
  private int mMax;
  
  /**
   * Minimum value.
   */
  private int mMin;
  
  /**
   * The current value.
   */
  private int mValue = 0;

  
  
  /**
   * Create a new instance of the NumberPreference.
   * 
   * @param context Context.
   * @param attrs Attributes.
   */
  public NumberPreference(final Context context, final AttributeSet attrs) {
    super(context, attrs);
    this.setPersistent(true);

    final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.NumberPreference, 0, 0);
    this.mSuffix = a.getString(R.styleable.NumberPreference_suffix);
    this.mMin = a.getInt(R.styleable.NumberPreference_min, 0);
    this.mMax = a.getInt(R.styleable.NumberPreference_max, 100);

    this.setDialogLayoutResource(R.layout.number_preference);
  }

  
  
  @Override
  protected void onBindDialogView(final View view) {
    super.onBindDialogView(view);
    
    ((TextView)view.findViewById(R.id.dialogMessage)).setText(this.getDialogMessage());

    this.mValueText = (TextView)view.findViewById(R.id.actualValue);

    this.mSeekBar = (SeekBar)view.findViewById(R.id.myBar);
    this.mSeekBar.setOnSeekBarChangeListener(this);
    this.mSeekBar.setMax(this.mMax - this.mMin);
    this.mSeekBar.setProgress(this.mValue - this.mMin);

    final String t = String.valueOf(this.mValue);
    this.mValueText.setText(this.mSuffix == null ? t : t.concat(this.mSuffix));
  }

  @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) {
    this.mValue = this.getPersistedInt(defaultValue == null ? 0 : (Integer)defaultValue);
  }

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

    if (positiveResult) {
      final int value = this.mSeekBar.getProgress() + this.mMin;
      if (this.callChangeListener(value)) {
        this.saveValue(value);
      }
    }
  }

  /**
   * Set the value.
   * 
   * @param value Value.
   */
  public void setValue(int value) {
    if (value > this.mMax) {
      value = this.mMax;
    } else if (value < this.mMin) {
      value = this.mMin;
    }
    this.mValue = value;
  }
  
  /**
   * Set and persist the value.
   * 
   * @param value Value.
   */
  private void saveValue(final int value) {
    this.setValue(value);
    this.persistInt(value);
  }

  /**
   * Set the maximum possible value.
   * 
   * @param max Maximum value.
   */
  public void setMax(final int max) {
    this.mMax = max;
    if (this.mValue > this.mMax) {
      this.setValue(this.mMax);
    }
  }

  /**
   * Set the minimum possible value.
   * 
   * @param min Minimum value.
   */
  public void setMin(final int min) {
    if (min < this.mMax) {
      this.mMin = min;
    }
  }

  /**
   * Called when the seek bar value is changed.
   */
  public void onProgressChanged(final SeekBar seek, final int value, final boolean fromTouch) {
    final String t = String.valueOf(value + this.mMin);
    this.mValueText.setText(this.mSuffix == null ? t : t.concat(this.mSuffix));
  }

  /**
   * Called when the seek bar has started to changed. Not used.
   */
  public void onStartTrackingTouch(final SeekBar seek) {}
  
  /**
   * Called when the seek bar has stopped changing. Not used.
   */
  public void onStopTrackingTouch(final SeekBar seek) {}
}

Java Source Code List

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