Android Open Source - banshee-remote Number Picker Preference

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License

The source code is released under:

GNU General Public License

Java Source Code

package de.viktorreiser.toolbox.preference;
//from w  ww . j ava 2 s .c om
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.LinearLayout;
import de.viktorreiser.toolbox.widget.NumberPicker;

/**
 * Integer number preference which extends {@link ValidatedDialogPreference}.<br>
 * <br>
 * XML attributes will be delegated to {@link NumberPicker}.<br>
 * <b>Note</b>: This preference persists an {@code Integer} not a {@code String}.<br>
 * <br>
 * Dependent preferences will be disabled when value is {@code 0}.<br>
 * <br>
 * <i>Depends on</i>: {@link ValidatedDialogPreference}, {@link NumberPicker}
 * 
 * @author Viktor Reiser &lt;<a href="mailto:viktorreiser@gmx.de">viktorreiser@gmx.de</a>&gt;
 */
public class NumberPickerPreference extends DialogPreference {
  
  // PRIVATE ====================================================================================
  
  /** Number picker view which contains input. */
  private NumberPicker mPicker;
  
  /** Layout which contains number picker view and placed as margin layout into dialog. */
  private LinearLayout mPickerlayout;
  
  /** Value of preference. */
  private int mNumber;
  
  // PUBLIC =====================================================================================
  
  /**
   * Get {@link NumberPicker} containing input of preference.
   * 
   * @return {@link NumberPicker} containing input of preference
   */
  public NumberPicker getNumberPicker() {
    return mPicker;
  }
  
  /**
   * Saves number to {@link SharedPreferences}.
   * 
   * @param number
   *            number to save
   */
  public void setNumber(int number) {
    final boolean wasBlocking = shouldDisableDependents();
    
    mNumber = number;
    
    persistInt(number);
    
    final boolean isBlocking = shouldDisableDependents();
    
    if (isBlocking != wasBlocking) {
      notifyDependencyChange(isBlocking);
    }
  }
  
  /**
   * Gets current set number of preference.
   * 
   * @return current preference value
   */
  public int getNumber() {
    return mNumber;
  }
  
  // OVERRIDDEN =================================================================================
  
  public NumberPickerPreference(Context context, AttributeSet attrs) {
    super(context, attrs);
    initialize(attrs);
  }
  
  public NumberPickerPreference(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    initialize(attrs);
  }
  
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Add number picker view to dialog.
   */
  @Override
  protected View onCreateDialogView() {
    ViewParent parent = mPickerlayout.getParent();
    
    if (parent != null) {
      ((ViewGroup) parent).removeView(mPickerlayout);
    }
    
    return mPickerlayout;
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Set entered value by keyboard to number picker.
   */
  @Override
  public void onClick(DialogInterface di, int which) {
    mPicker.clearFocus();
    
    super.onClick(di, which);
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Set edit text value on bind.
   */
  @Override
  protected void onBindDialogView(View view) {
    super.onBindDialogView(view);
    
    mPicker.setCurrent(getNumber());
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Dependent values should be disabled when value is {@code 0}.
   */
  @Override
  public boolean shouldDisableDependents() {
    return mNumber == 0 || super.shouldDisableDependents();
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Get default value.
   */
  @Override
  protected Object onGetDefaultValue(TypedArray a, int index) {
    return a.getInt(index, 0);
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Set initial value.
   */
  @Override
  protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
    if (restoreValue) {
      setNumber(getPersistedInt(0));
    }
    
    if (defaultValue != null) {
      setNumber((Integer) defaultValue);
    }
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Save state.
   */
  @Override
  protected Parcelable onSaveInstanceState() {
    final Parcelable superState = super.onSaveInstanceState();
    
    if (isPersistent()) {
      return superState;
    }
    
    final SavedState myState = new SavedState(superState);
    myState.number = getNumber();
    return myState;
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Restore state.
   */
  @Override
  protected void onRestoreInstanceState(Parcelable state) {
    if (state == null || !state.getClass().equals(SavedState.class)) {
      super.onRestoreInstanceState(state);
      return;
    }
    
    SavedState myState = (SavedState) state;
    super.onRestoreInstanceState(myState.getSuperState());
    setNumber(myState.number);
  }
  
  /**
   * <i>Overridden for internal use!</i><br>
   * <br>
   * Persist value (if desired).
   */
  @Override
  protected void onDialogClosed(boolean positiveResult) {
    super.onDialogClosed(positiveResult);
    
    if (positiveResult) {
      int result = mPicker.getCurrent();
      
      if (callChangeListener(result)) {
        setNumber(result);
      }
    }
  }
  
  // PRIVATE ====================================================================================
  
  /**
   * Initialize preference view and it's behavior.
   */
  private void initialize(AttributeSet attrs) {
    // setup edit text
    mPicker = new NumberPicker(getContext(), attrs);
    mPicker.setEnabled(true);
    mPicker.setLayoutParams(new ViewGroup.LayoutParams(
        ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
    
    // setup layout for edit text
    int dip = (int) (TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10,
        getContext().getResources().getDisplayMetrics()) + 0.5f);
    
    mPickerlayout = new LinearLayout(getContext());
    mPickerlayout.setLayoutParams(new ViewGroup.LayoutParams(
        ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
    mPickerlayout.setPadding(dip, dip, dip, dip);
    mPickerlayout.addView(mPicker);
  }
  
  
  /**
   * Used to re/store state of preference.
   * 
   * @author Viktor Reiser &lt;<a href="mailto:viktorreiser@gmx.de">viktorreiser@gmx.de</a>&gt;
   */
  private static class SavedState extends BaseSavedState {
    
    Integer number;
    
    public SavedState(Parcel source) {
      super(source);
      number = source.readInt();
    }
    
    public SavedState(Parcelable superState) {
      super(superState);
    }
    
    @Override
    public void writeToParcel(Parcel dest, int flags) {
      super.writeToParcel(dest, flags);
      dest.writeInt(number);
    }
    
    @SuppressWarnings("unused")
    public static final Parcelable.Creator<SavedState> CREATOR =
        new Parcelable.Creator<SavedState>() {
          @Override
          public SavedState createFromParcel(Parcel in) {
            return new SavedState(in);
          }
          
          @Override
          public SavedState [] newArray(int size) {
            return new SavedState [size];
          }
        };
  }
}

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