convert Drawable To Gray Scale - Android Graphics

Android examples for Graphics:Drawable Filter

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Description

convert Drawable To Gray Scale

Demo Code

/*   //from  www .j a v a 2  s  .c  om
 * Copyright 2013 Karsten Patzwaldt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.book2s;
import android.content.Context;
import android.graphics.Color;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.Drawable;
import android.util.SparseArray;

public class Main {
    private static SparseArray<Drawable> mGrayscaleCache = new SparseArray<Drawable>();

    public static Drawable convertDrawableToGrayScale(Context ctx, int resId) {
        Drawable res = ctx.getResources().getDrawable(resId).mutate();

        res.setColorFilter(Color.GRAY, Mode.SRC_IN);

        return res;
    }

    public static Drawable getDrawable(Context ctx, int resId,
            boolean enabled) {
        if (enabled)
            return ctx.getResources().getDrawable(resId);

        if (mGrayscaleCache.indexOfKey(resId) > 0) {
            return mGrayscaleCache.get(resId);
        } else {
            Drawable drawable = convertDrawableToGrayScale(ctx, resId);

            mGrayscaleCache.put(resId, drawable);

            return drawable;
        }
    }
}

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