Android Open Source - Dreamer Context Wrapper Edge Effect

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (c) 2013 Android Alliance, LTD
 */*from  w  ww  . j a v  a  2s .c  om*/
 * 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.android.fancyblurdemo.app;

import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.AssetManager;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.Log;

/**
 * This code was created by the AndroidAlliance and
 * has been borrrowed from https://github.com/AndroidAlliance/EdgeEffectOverride.
 */
public class ContextWrapperEdgeEffect extends ContextWrapper {

    private ResourcesEdgeEffect mResourcesEdgeEffect;
    private int mColor;
    private Drawable mEdgeDrawable;
    private Drawable mGlowDrawable;

    public ContextWrapperEdgeEffect(Context context) {
        this(context, 0);
    }

    public ContextWrapperEdgeEffect(Context context, int color) {
        super(context);
        mColor = color;
        Resources resources = context.getResources();
        mResourcesEdgeEffect = new ResourcesEdgeEffect(resources.getAssets(), resources.getDisplayMetrics(), resources.getConfiguration());
    }

    public void setEdgeEffectColor(int color) {
        mColor = color;
        if (mEdgeDrawable != null) mEdgeDrawable.setColorFilter(color, PorterDuff.Mode.MULTIPLY);
        if (mGlowDrawable != null) mGlowDrawable.setColorFilter(color, PorterDuff.Mode.MULTIPLY);
    }

    @Override
    public Resources getResources() {
        return mResourcesEdgeEffect;
    }

    private class ResourcesEdgeEffect extends Resources {
        private int overscroll_edge = getPlatformDrawableId("overscroll_edge");
        private int overscroll_glow = getPlatformDrawableId("overscroll_glow");

        public ResourcesEdgeEffect(AssetManager assets, DisplayMetrics metrics, Configuration config) {
            //super(metrics, localConfiguration);
            super(assets, metrics, config);
        }

        private int getPlatformDrawableId(String name) {
            try {
                int i = ((Integer) Class.forName("com.android.internal.R$drawable").getField(name).get(null)).intValue();
                return i;
            } catch (ClassNotFoundException e) {
                Log.e("[ContextWrapperEdgeEffect].getPlatformDrawableId()", "Cannot find internal resource class");
                return 0;
            } catch (NoSuchFieldException e1) {
                Log.e("[ContextWrapperEdgeEffect].getPlatformDrawableId()", "Internal resource id does not exist: " + name);
                return 0;
            } catch (IllegalArgumentException e2) {
                Log.e("[ContextWrapperEdgeEffect].getPlatformDrawableId()", "Cannot access internal resource id: " + name);
                return 0;
            } catch (IllegalAccessException e3) {
                Log.e("[ContextWrapperEdgeEffect].getPlatformDrawableId()", "Cannot access internal resource id: " + name);
            }
            return 0;
        }

        @Override
        public Drawable getDrawable(int resId) throws Resources.NotFoundException {
            Drawable ret = null;
            if (resId == this.overscroll_edge) {
                mEdgeDrawable = ContextWrapperEdgeEffect.this.getBaseContext().getResources().getDrawable(R.drawable.overscroll_edge);
                ret = mEdgeDrawable;
            } else if (resId == this.overscroll_glow) {
                mGlowDrawable = ContextWrapperEdgeEffect.this.getBaseContext().getResources().getDrawable(R.drawable.overscroll_glow);
                ret = mGlowDrawable;
            } else return super.getDrawable(resId);

            if (ret != null) {
                ret.setColorFilter(mColor, PorterDuff.Mode.MULTIPLY);
            }

            return ret;
        }
    }
}

Java Source Code List

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