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Tinker is a hot-fix solution library for Android, it supports dex, library and resources update without reinstalling apk.

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/*
 * Tencent is pleased to support the open source community by making Tinker available.
 *
 * Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * 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.tencent.tinker.build.decoder;

import com.tencent.tinker.build.patch.Configuration;
import com.tencent.tinker.build.util.TinkerPatchException;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;

/**
 * Created by zhangshaowen on 16/2/28.
 */
public abstract class BaseDecoder {

    protected final Configuration config;
    protected final File          outDir;

    protected final File resultDir;


    public BaseDecoder(Configuration config) throws IOException {
        this.config = config;
        this.outDir = new File(config.mOutFolder);

        this.resultDir = config.mTempResultDir;

    }

    public Configuration getConfig() {
        return config;
    }


    protected void clean() {
    }

    public Path getRelativePath(File file) {
        return config.mTempUnzipNewDir.toPath().relativize(file.toPath());
    }

    public Path getOutputPath(File file) {
        return config.mTempResultDir.toPath().resolve(getRelativePath(file));
    }

    public String getRelativePathStringToOldFile(File oldFile) {
        return config.mTempUnzipOldDir.toPath().relativize(oldFile.toPath()).toString().replace("\\", "/");
    }

    public String getRelativePathStringToNewFile(File newFile) {
        return config.mTempUnzipNewDir.toPath().relativize(newFile.toPath()).toString().replace("\\", "/");
    }

    public String getParentRelativePathStringToNewFile(File newFile) {
        return config.mTempUnzipNewDir.toPath().relativize(newFile.getParentFile().toPath()).toString().replace("\\", "/");
    }

    /**
     * 就算前后两个文件都是一样,也会交到这个文件夹
     *
     * @param oldFile 如果oldfile 为空，代表这是一个新的文件
     * @param newFile
     * @throws IOException
     * @throws TinkerPatchException
     */
    abstract public boolean patch(File oldFile, File newFile) throws Exception;

    abstract public void onAllPatchesStart() throws Exception;

    abstract public void onAllPatchesEnd() throws Exception;
}