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Android example source code file (ApplicationLoaders.java)

This example Android source code file (ApplicationLoaders.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

applicationloaders, classloader, hashmap, pathclassloader, string, util

The ApplicationLoaders.java Android example source code

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * 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 android.app;

import dalvik.system.PathClassLoader;

import java.util.HashMap;

class ApplicationLoaders
{
    public static ApplicationLoaders getDefault()
    {
        return gApplicationLoaders;
    }

    public ClassLoader getClassLoader(String zip, String appDataDir,
            ClassLoader parent)
    {
        /*
         * This is the parent we use if they pass "null" in.  In theory
         * this should be the "system" class loader; in practice we
         * don't use that and can happily (and more efficiently) use the
         * bootstrap class loader.
         */
        ClassLoader baseParent = ClassLoader.getSystemClassLoader().getParent();

        synchronized (mLoaders) {
            if (parent == null) {
                parent = baseParent;
            }

            /*
             * If we're one step up from the base class loader, find
             * something in our cache.  Otherwise, we create a whole
             * new ClassLoader for the zip archive.
             */
            if (parent == baseParent) {
                ClassLoader loader = (ClassLoader)mLoaders.get(zip);
                if (loader != null) {
                    return loader;
                }
    
                PathClassLoader pathClassloader =
                    new PathClassLoader(zip, appDataDir + "/lib", parent);
                
                mLoaders.put(zip, pathClassloader);
                return pathClassloader;
            }

            return new PathClassLoader(zip, parent);
        }
    }

    private final HashMap mLoaders = new HashMap();

    private static final ApplicationLoaders gApplicationLoaders
        = new ApplicationLoaders();
}

Other Android examples (source code examples)

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