本教程采用阿里dexposed开源库实现。
https://github.com/alibaba/dexposed
主APP实现：
主程序Application onCreate方法中初始化dexposed
DexposedBridge.canDexposed(context);
Patch apk下载及修复：
- 为保证修复patch的及时性，使用push推送patch，客户端收到消息后立即完成patch的下载及修复；
- 客户端版本管理模块在程序入口Activity中检测是否有需要修复的patch；
- 下载完patch apk到程序私有目录，即/data/data/packageName/files目录，同时可在xml中保存patch apk本地存储路径、方便下载启动app时加载补丁patch。
public class HotPatchManager {
public static boolean canDexposed = false;
private static final String SP_KEY_HOT_PATCH = "hot_patch_path";
/**
* init hotPatch library.
*
* @param Context
*/
public static void init(Context context) {
// aop init.
canDexposed = DexposedBridge.canDexposed(context);
if (canDexposed) {
List list = getHotPatchPaths(context);
if (list != null && list.size() > 0) {
for (String path : list) {
runPatchApk(context, path);
}
}
} else {
if (LogUtils.DEBUG) {
LogUtils.d("==========your device not support dexposed aop.==========");
}
}
}
/**
* /data/data/package/files
*
* @param context
* @param apkPath
*/
public static void runPatchApk(Context context, String apkPath) {
if (Build.VERSION.SDK_INT >= 21 || !canDexposed) {
LogUtils.d("This device doesn't support dexposed.");
return;
}
if (!pathIsValid(context, apkPath)) {
return;
}
try {
PatchResult result = PatchMain.load(context, apkPath, null);
if (result.isSuccess()) {
LogUtils.d("hotPath load apk success.");
} else {
LogUtils.e("hotPath load apk error.", result.getErrorInfo());
result.getThrowbale().printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* download hotPatch and auto mege.
*
* @param context
*/
public static void downloadHotPatch(final Context context, String downloadUrl) {
if (TextUtils.isEmpty(downloadUrl)) {
LogUtils.d("downloadUrl is null.");
return;
}
DownloadInfo downloadInfo = new DownloadInfo();
downloadInfo.setDownloadUrl(downloadUrl);
String fileName = downloadUrl.substring(downloadUrl.lastIndexOf("/") + 1);
String fileSavePath = new File(context.getFilesDir(), fileName).getAbsolutePath();
downloadInfo.setFileSavePath(fileSavePath);
downloadInfo.setDaoCallback(
new Task.Callback() {
@Override
public void onSuccess(DownloadInfo downloadInfo) {
LogUtils.d("runPatchApk begin.", downloadInfo.getFileSavePath());
runPatchApk(context, downloadInfo.getFileSavePath());
appendHotPatchPath(context, downloadInfo.getFileSavePath());
LogUtils.d("runPatchApk end.", downloadInfo.getFileSavePath());
}
@Override
public void onStart(DownloadInfo downloadInfo) {
}
@Override
public void onFailure(DownloadInfo downloadInfo) {
}
@Override
public boolean onLoading(long total, long current) {
return true;
}
@Override
public void onCancelled(DownloadInfo downloadInfo) {
}
}
);
DownloadManager dm = DownloadService.getDownloadManager(context, DownloadService.ACTION);
dm.addDownloadTask(downloadInfo);
}
public static void clearHotPatchFiles(Context context) {
List list = getHotPatchPaths(context);
if (list != null && list.size() > 0) {
for (String path : list) {
FileUtils.delFile(path);
}
}
}
public static boolean pathIsValid(Context context, String apkPath) {
if (TextUtils.isEmpty(apkPath)) {
LogUtils.d("apkPath is null.");
return false;
}
String parentDir = String.format("/data/data/%s/files", context.getPackageName());
File apkFile = new File(apkPath);
if (!parentDir.equals(apkFile.getParent())) {
LogUtils.d("apkPath is error.", apkPath);
return false;
}
if (!apkFile.exists()){
LogUtils.d("apkPath is not exist.", apkPath);
return false;
}
return true;
}
public static List getHotPatchPaths(Context context) {
List list = null;
SP sp = SP.getInstance(context);
String paths = sp.getString(SP_KEY_HOT_PATCH, null);
if (!TextUtils.isEmpty(paths)) {
if (paths.indexOf(",") != -1) {
String[] pathArr = paths.split(",");
if (pathArr != null && pathArr.length > 0) {
list = Arrays.asList(paths);
}
} else {
list = new ArrayList();
list.add(paths);
}
}
return list;
}
public static void appendHotPatchPath(Context context, String apkPath) {
if (!pathIsValid(context, apkPath)) {
return;
}
SP sp = SP.getInstance(context);
String paths = sp.getString(SP_KEY_HOT_PATCH, null);
if (!TextUtils.isEmpty(paths)) {
String allPath = new StringBuilder(apkPath).append(",").append(apkPath).toString();
sp.commit(SP_KEY_HOT_PATCH, allPath);
} else {
sp.commit(SP_KEY_HOT_PATCH, apkPath);
}
}
public static void clearHotPatchPaths(Context context) {
SP sp = SP.getInstance(context);
sp.commit(SP_KEY_HOT_PATCH, "");
}
}
Patch Apk部分：
dexpose支持方法粒度的patch，可以实现整个方法的替换或方法前、后执行修复代码。
以下实例为方法替换实例，其它只需实现相应的回调接口即可。
方法替换实例：
- 新建Android工程，引入patchloader.jar、dexposedbridge.jar；
- 创建Patch修复类实现IPatch接口；
public class HotPatch implements IPatch {
@Override
public void handlePatch(final PatchParam arg0) throws Throwable {
Class cls = null;
try {
cls= arg0.context.getClassLoader()
.loadClass("com.zaozuo.app.MainActivity");
} catch (ClassNotFoundException e) {
e.printStackTrace();
return;
}
DexposedBridge.findAndHookMethod(cls, "bindData",
new XC_MethodReplacement() {
@Override
protected Object replaceHookedMethod(MethodHookParam param) throws Throwable {
Activity mainActivity = (Activity) param.thisObject;
Toast.makeText(mainActivity, "test show hotPatch.",Toast.LENGTH_LONG).show();
return null;
}
});
}
}
- 打包patch apk，上传到服务器并通知客户端下载。
Patch Apk安全性：
- 打包apk必须使用主app签名文件签名；
- 主app对加载的patch apk做签名和无篡改校验：
本文作者：gcoder.io
本文链接：http://gcoder-io.github.io/2015/08/12/android-hotpatch-dexposed/
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