src/android/src/com/google/android/inputmethod/japanese/view/DummyDrawable.java

// Copyright 2010-2014, Google Inc.
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package org.mozc.android.inputmethod.japanese.view;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.drawable.Drawable;

/**
 * Singleton dummy drawable which does nothing.
 * <p>
 * Typically used when skin is not specified.
 */
public class DummyDrawable extends Drawable {

  private static final DummyDrawable theInstance = new DummyDrawable();

  public static DummyDrawable getInstance() {
    return theInstance;
  }

  private DummyDrawable() {}

  @Override
  public void draw(Canvas canvas) {
  }

  @Override
  public int getOpacity() {
    return 0;
  }

  @Override
  public void setAlpha(int alpha) {
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
  }

  @Override
  public ConstantState getConstantState() {
    return new ConstantState() {
      @Override
      public Drawable newDrawable() {
        return theInstance;
      }

      @Override
      public int getChangingConfigurations() {
        return 0;
      }
    };
  }
}