Cordova项目config.xml添加android权限

最近在开发cordova项目，安卓APP需要调用照相机和系统相册，在添加安卓权限的时候，总是报错。

以下是部分config.xml代码

<platform name="android">
        <name>项目名称</name>
        <allow-intent href="market:*" />
        <icon density="ldpi" src="res/icon/android/icon_48.png" />
        <icon density="mdpi" src="res/icon/android/icon_48.png" />
        <icon density="hdpi" src="res/icon/android/icon_72.png" />
        <icon density="xhdpi" src="res/icon/android/icon_96.png" />
        <icon density="xxhdpi" src="res/icon/android/icon_144.png" />
        <icon density="xxxhdpi" src="res/icon/android/icon_192.png" />
        <splash density="land-hdpi" src="res/screen/android/splash-land-hdpi.png" />
        <splash density="land-ldpi" src="res/screen/android/splash-land-ldpi.png" />
        <splash density="land-mdpi" src="res/screen/android/splash-land-mdpi.png" />
        <splash density="land-xhdpi" src="res/screen/android/splash-land-xhdpi.png" />
        <splash density="land-xxhdpi" src="res/screen/android/splash-land-xxhdpi.png" />
        <splash density="port-hdpi" src="res/screen/android/splash-port-hdpi.png" />
        <splash density="port-ldpi" src="res/screen/android/splash-port-ldpi.png" />
        <splash density="port-mdpi" src="res/screen/android/splash-port-mdpi.png" />
        <splash density="port-xhdpi" src="res/screen/android/splash-port-xhdpi.png" />
        <splash density="port-xxhdpi" src="res/screen/android/splash-port-xxhdpi.png" />
        <config-file parent="/*" target="AndroidManifest.xml">
            <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
            <uses-permission android:name="android.permission.CAMERA" />
        </config-file>
    </platform>

其中权限部分为：

<config-file parent="/*" target="AndroidManifest.xml">
            <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
            <uses-permission android:name="android.permission.CAMERA" />
</config-file>

编译的时候总是报错：

/platforms/android/build/intermediates/res/merged/debug/xml/config.xml:79: error: Error parsing XML: unbound prefix

解决：

在widget标签引入xmlns:android="http://schemas.android.com/apk/res/android"

<widget id="com.demo.myapp" version="1.1.0.0" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">