Android Open Source - youtubeAPI Recycling Bitmap Drawable

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (c) 2013 Google Inc./*from  ww  w. j  av a 2s. com*/
 * 
 * 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.sickboots.ytube.util;

import com.sickboots.ytube.BuildConfig;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;


/**
 * A BitmapDrawable that keeps track of whether it is being displayed or cached.
 * When the drawable is no longer being displayed or cached,
 * {@link Bitmap#recycle() recycle()} will be called on this drawable's bitmap.
 */
public class RecyclingBitmapDrawable extends BitmapDrawable {

    static final String LOG_TAG = "CountingBitmapDrawable";

    private int mCacheRefCount = 0;
    private int mDisplayRefCount = 0;

    private boolean mHasBeenDisplayed;

    public RecyclingBitmapDrawable(Resources res, Bitmap bitmap) {
        super(res, bitmap);
    }

    /**
     * Notify the drawable that the displayed state has changed. Internally a
     * count is kept so that the drawable knows when it is no longer being
     * displayed.
     *
     * @param isDisplayed - Whether the drawable is being displayed or not
     */
    public void setIsDisplayed(boolean isDisplayed) {
        synchronized (this) {
            if (isDisplayed) {
                mDisplayRefCount++;
                mHasBeenDisplayed = true;
            } else {
                mDisplayRefCount--;
            }
        }

        // Check to see if recycle() can be called
        checkState();
    }

    /**
     * Notify the drawable that the cache state has changed. Internally a count
     * is kept so that the drawable knows when it is no longer being cached.
     *
     * @param isCached - Whether the drawable is being cached or not
     */
    public void setIsCached(boolean isCached) {
        synchronized (this) {
            if (isCached) {
                mCacheRefCount++;
            } else {
                mCacheRefCount--;
            }
        }

        // Check to see if recycle() can be called
        checkState();
    }

    private synchronized void checkState() {
        // If the drawable cache and display ref counts = 0, and this drawable
        // has been displayed, then recycle
        if (mCacheRefCount <= 0 && mDisplayRefCount <= 0 && mHasBeenDisplayed
                && hasValidBitmap()) {
            if (BuildConfig.DEBUG) {
                Log.d(LOG_TAG, "No longer being used or cached so recycling. "
                        + toString());
            }

            getBitmap().recycle();
        }
    }

    private synchronized boolean hasValidBitmap() {
        Bitmap bitmap = getBitmap();
        return bitmap != null && !bitmap.isRecycled();
    }

}

Java Source Code List