React Native Android(安卓)即时热更新bundle 以及增量更新bundle~

本文仅仅提供热更新与热更新的思路
具体实现代码会提供一些核心代码。

1. 加载bundle
我加载bundle的方式不是放在RaactActivity中，而是实现ReactApplication，放在mainapplication,正常Android代码也会有一个application是程序启动的一些初始化工作。代码如下：

private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {        @Override        protected boolean getUseDeveloperSupport() {            return com.HeMingNetwork.ruyipin.recruiter.BuildConfig.DEBUG;        }        @Override        protected List getPackages() {            return Arrays.asList(                    new MainReactPackage(),            );        }        @Nullable        @Override        protected String getJSBundleFile() {            if (BuildConfig.DEBUG) {                return super.getJSBundleFile();            } else {                String path = MainApplication.this.getFilesDir().getAbsolutePath() + "/index.android.bundle";                if (!isFirstByMainActivity) {                    return super.getJSBundleFile();                }                if (Utils.isFileExit(path)) {                    return MainApplication.this.getFilesDir().getAbsolutePath() + "/index.android.bundle";                } else {                    return super.getJSBundleFile();                }            }        }    };

如果是debug，super.getJSBundleFile()跑的是本地磁盘上的bundle包，release模式下加载的是assets里的index.android.bundle。
属性isFirstByMainActivity判断是不是第一次使用，之后每次加载的都是下载在本地的bundle包，
2. 对比bundle
新建一个AppManager的管理bundle与apk的类，

@ReactMethod    public void updateAppThods(ReadableMap readableMap) {        Activity activity = getCurrentActivity();        SharedPreferences sp = activity.getSharedPreferences("latestVersion", 0);        if (Integer.parseInt(sp.getString("bundelVersion", "1")) != Integer.parseInt(readableMap.getString("bundleVer"))) {            NetHelper netHelper = new NetHelper(activity);            netHelper.downJsBundle();        } else {            Log.d("readableArray", "相等");        }    }

updateAppThods是在js中调用的代码，js中有一个定时器定时读取bundle的版本接口，数据格式类似{bundleVer:”x”,bundleUrl:”url”,},如果版本号不同，就去下载bundle。
3. 下载bundle

public void downJsBundle(String urlStr) {        final String fileName = "index.android.bundle";        final File dir = activity.getFilesDir();        File file = new File(dir, fileName);        Log.d(TAG, file.getAbsolutePath());        if (file.exists()) {            file.delete();        }        OkHttpClient mOkHttpClient = new OkHttpClient();        Request request = new Request.Builder().url(urlStr).build();        mOkHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {//                Toast.makeText(activity,"bundle下载失败",Toast.LENGTH_SHORT).show();                Log.e("downJsBundle", "bundle下载失败");                activity.runOnUiThread(new Runnable() {                    @Override                    public void run() {                        new AlertDialog.Builder(activity).setTitle("网络错误")                                .setMessage("请检查网络连接")                                .setPositiveButton("确定", null).show();                    }                });            }            @Override            public void onResponse(Call call, Response response) throws IOException {                InputStream inputStream = response.body().byteStream();                FileOutputStream fileOutputStream = null;                try {                    File bundle = new File(dir, fileName);                    fileOutputStream = new FileOutputStream(bundle);                    byte[] buffer = new byte[2048];                    int len = 0;                    double fileSize = 0;                    while ((len = inputStream.read(buffer)) != -1) {                        fileOutputStream.write(buffer, 0, len);                        fileSize += len;                    }                    Log.e("jsbundle", fileSize / 1024 / 1024 + "MB");                    fileOutputStream.flush();                    Log.e("downJsBundle", "bundle下载成功");                    Log.d("downJsBundle", "bundleVersion==" + bundleVersion);                    VersionMgr.bundelVersion = bundleVersion;                    SharedPreferences sp = activity.getSharedPreferences("latestVersion", 0);                    SharedPreferences.Editor edit = sp.edit();                    edit.putString("bundelVersion", bundleVersion);                    edit.commit();                    edit.putString("bundelVersion", VersionMgr.bundelVersion);                    activity.runOnUiThread(new Runnable() {                        @Override                        public void run() {                            new AlertDialog.Builder(activity).setTitle("有新版本的更新")                                    .setMessage("需要更新嘛？")                                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {                                        @Override                                        public void onClick(DialogInterface dialog, int which) {                                            activity.runOnUiThread(new Runnable() {                                                @Override                                                public void run() {                                                    Intent intent = activity.getBaseContext().getPackageManager().getLaunchIntentForPackage(activity.getBaseContext().getPackageName());                                                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);                                                    activity.startActivity(intent);                                                    activity.finish();                                                }                                            });                                        }                                    })                                    .setNegativeButton("取消", null)                                    .show();                        }                    });                } catch (IOException e) {                    Log.e("downJsBundle", "bundle保存失败" + e.toString());                    e.printStackTrace();                }//                activity.runOnUiThread(new Runnable() {//                    @Override//                    public void run() {//                        activity.startActivity(new Intent(activity, MainActivity.class));//                        activity.finish();//                    }//                });            }        });    }

bundle 并且把版本号存在本地。

4 增量更新
待续~~

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