Android热修复

参考链接：
浅谈Android热修复：http://blog.youkuaiyun.com/caihongdao123/article/details/52051799
Android 热补丁动态修复框架小结：http://blog.youkuaiyun.com/lmj623565791/article/details/49883661
Android热修复之AndFix：http://blog.youkuaiyun.com/zhimingshangyan/article/details/51893983

准备工作

下载拆分包工具apkpatch-1.0.3

https://github.com/alibaba/AndFix/tree/master/tools

引入AndFix库

compile 'com.alipay.euler:andfix:0.3.1@aar'

查看AndFix源码：

https://github.com/alibaba/AndFix

关键代码

//补丁管理器
PatchManager mPatchManager = new PatchManager(this);
//初始化
mPatchManager.init("1.0");
//移除所有补丁
mPatchManager.removeAllPatch();
//加载当前所有补丁
mPatchManager.loadPatch();
//添加补丁
mPatchManager.addPatch(patchFileString);

doc命令：

apkpatch.bat -f new1.apk -t old.apk -o output -k andfix.keystore -p 123456 -a andfix -e 123456

apkpatch.bat -f 修改后的apk -t 未修改前的apk -o output -k keystore签名 -p ketstore密码 -a alias名称 -e alias密码

程序代码

MainApplication.java

public class MainApplication extends Application {
    public static PatchManager mPatchManager;
    @Override
    public void onCreate() {
        super.onCreate();
        try {
            //注意每次appversion变更都会导致所有补丁被删除,如果appversion没有改变，则会加载已经保存的所有补丁。
            String appversion = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
            PatchManager mPatchManager = new PatchManager(this);
            mPatchManager.init(appversion);
        } catch (Exception e) {
        }
    }
}

MainActivity.java

public class MainActivity extends Activity {

    public  PatchManager mPatchManager;
    static TextView tv_say_content;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try {
            MainApplication application = (MainApplication) getApplication();
            this.mPatchManager = application.mPatchManager;

            //值得注意的是andfix只能加载一次补丁，如果要生效需要调用
            mPatchManager.removeAllPatch();
            mPatchManager.loadPatch();
            //添加patch，只需指定patch的路径即可，补丁会立即生效
            File fileDir = new File(Environment.getExternalStorageDirectory()
                    .getAbsolutePath() + "/apatch");
            if(!fileDir.exists()){
                fileDir.mkdir();
            }else{
                //按顺序添加多个补丁,建议不超过2个，AndFix适合紧急修复不适合迭代修复
                File[] files = fileDir.listFiles();
                for (int i = 0; i < files.length; i++) {
                    String name = files[i].getName();
                    mPatchManager.addPatch(files[i].getAbsolutePath());
                }
            }

            //添加单个补丁
//            String APATCH_PATH = "/out.apatch";
//            String patchFileString = Environment.getExternalStorageDirectory()
//                    .getAbsolutePath() + APATCH_PATH;
//            mPatchManager.addPatch(patchFileString);

        } catch (Exception e) {
            e.printStackTrace();
        }

        if (savedInstanceState == null) {
            getFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
            tv_say_content = (TextView)rootView.findViewById(R.id.tv_say_content);
            Button btn_say = (Button)rootView.findViewById(R.id.btn_say);
            btn_say.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    tv_say_content.setText(new AndFixSay().sayFix());
                }
            });
            //1.没有image,点击btn say
            //2.没有image,点击btn sayFix
            //3.有image，点击btn sayFix
            //4.有image，点击btn sayFix,点击image say
            ImageView image = (ImageView)rootView.findViewById(R.id.iv);
            image.setVisibility(View.VISIBLE);
            image.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    tv_say_content.setText(new AndFixSay().say());
                }
            });
            return rootView;
        }
    }
}

生成补丁操作

准备keystore，old.apk，new.apk放在apkpatch-1.0.3目录下

进入到apkpatch-1.0.3目录下，执行apatch命令

回车生成output文件夹

output目录下有一个.apatch的文件，这个就是新旧版本的差分补丁

.apatch补丁名可随意修改，方便理解。

注意点：

不要指望依赖.apatch来完成多个版本的迭代，任何的补丁修复技术只是用于bug的紧急修复。
正式开发的时候建议将.apatch文件放在后台，能在适当时机起到修复补丁的作用。
有什么不懂的请点击本文开头的3个参考链接，那里有更加详细的说明。