android解析apk中manifest文件

通过 android 私有方法，快速解析 manifest，步骤如下：

1. 首先通过 AssetManager 的 addAssetPath 方法获取 cookie，注意这个方法是隐藏的，所以需要通过反射来调用
2. 然后通过 AssetManager 的 openXmlResourceParser 方法，传入 cookie， 返回解析器

public class TestLoadApk {
    private static String TAG = "TestLoadApk";

    public String getAppPackageId(Context context, String apkPath) {
        String packageId = "";
        try {
            XmlResourceParser parser = getBinaryXmlParser(context, apkPath, "AndroidManifest.xml");
            if (parser != null) {
                int eventType;
                while ((eventType = parser.nextToken()) != XmlPullParser.END_DOCUMENT) {
                    if (eventType == XmlPullParser.START_TAG) {
                        Log.i(TAG, "eventType:" + eventType + " name:" + parser.getName());
                        if (parser.getName().equals("manifest")) {
                            for (int i = 0; i < parser.getAttributeCount(); i++)
                                if (parser.getAttributeName(i).equals("package"))
                                    packageId = parser.getAttributeValue(i);
                            break;
                        }
                    }
                }

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

        Log.i(TAG, "packageId:" + packageId);

        return packageId;
    }

    private static XmlResourceParser getBinaryXmlParser(Context context, String binaryFilePath, String binaryXmlFileName)
            throws ReflectiveOperationException, IOException {
        if (TextUtils.isEmpty(binaryFilePath) || TextUtils.isEmpty(binaryXmlFileName)) {
            return null;
        }
        AssetManager assetManager = context.getAssets();
        Method addAssetPath = assetManager.getClass().getMethod("addAssetPath", String.class);
        addAssetPath.setAccessible(true);
        int cookie = (int) addAssetPath.invoke(assetManager, binaryFilePath);
        return assetManager.openXmlResourceParser(cookie, binaryXmlFileName);
    }
}