Cordova 和 proguard：takePicture 上的相机插件 NPE

Question

抱歉，如果有人已经问过这个。我是 Stack 的新手，我没有找到解决方案。

这是我在缩小应用程序后使用它得到的堆栈。

08-29 13:27:30.330 10037-10192/? E/PluginManager: Uncaught exception from plugin
                                              java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.PackageItemInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
                                                  at android.support.v4.content.FileProvider.parsePathStrategy(Unknown Source)
                                                  at android.support.v4.content.FileProvider.getPathStrategy(Unknown Source)
                                                  at android.support.v4.content.FileProvider.getUriForFile(Unknown Source)
                                                  at org.apache.cordova.camera.CameraLauncher.takePicture(Unknown Source)
                                                  at org.apache.cordova.camera.CameraLauncher.callTakePicture(Unknown Source)
                                                  at org.apache.cordova.camera.CameraLauncher.execute(Unknown Source)
                                                  at org.apache.cordova.CordovaPlugin.execute(Unknown Source)
                                                  at org.apache.cordova.PluginManager.exec(Unknown Source)
                                                  at org.apache.cordova.CordovaBridge.jsExec(Unknown Source)
                                                  at org.apache.cordova.engine.SystemExposedJsApi.exec(Unknown Source)
                                                  at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
                                                  at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:7)
                                                  at android.os.Handler.dispatchMessage(Handler.java:102)
                                                  at android.os.Looper.loop(Looper.java:154)
                                                  at android.os.HandlerThread.run(HandlerThread.java:61)

这是我的混淆文件：

    # ionic
-keep class org.apache.cordova.** { *; }
-keep class org.apache.cordova.camera.** { *; }
-keep public class * extends org.apache.cordova.CordovaPlugin
-keep class com.ionic.keyboard.IonicKeyboard.** { *; }

-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
    public static final *** NULL;
}
-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
    @com.google.android.gms.common.annotation.KeepName *;
}
-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}

# Not sure if needed, found it in several documentations
-keep class * extends java.util.ListResourceBundle {
    protected Object[][] getContents();
}
-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
    public static final *** NULL;
}
-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
    @com.google.android.gms.common.annotation.KeepName *;
}
-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider
-keep public class * extends android.app.backup.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

#-libraryjars ./libs/android-support-v4.jar
-dontwarn android.support.v4.**

-keep class android.support.v4.** { *; }
-keep interface android.support.v4.** { *; }
-keep public class * extends android.support.v4.**
-keep public class * extends android.app.Fragment
-keep class android.support.v4.content.FileProvider

-keepclasseswithmembernames class * {
    native <methods>;
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}

-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

-dontwarn com.worklight.common.internal.WLTrusteerInternal*
-dontwarn com.worklight.jsonstore.**
-dontwarn org.codehaus.jackson.map.ext.*
-dontwarn com.worklight.androidgap.push.GCMIntentService
-dontwarn com.worklight.androidgap.plugin.WLInitializationPlugin
-dontwarn android.net.SSLCertificateSocketFactory
-dontwarn android.net.http.*

-keepattributes *Annotation*

如果我使用 "choose from the gallery" 项目，一切正常，但每次我尝试使用相机时都会出现此错误。

对于 android 清单，我有这个：

<?xml version='1.0' encoding='utf-8'?>
<manifest android:hardwareAccelerated="true" android:versionCode="24" android:versionName="2.4" package="" xmlns:android="http://schemas.android.com/apk/res/android">
    <supports-screens android:anyDensity="true" android:largeScreens="true" android:normalScreens="true" android:resizeable="true" android:smallScreens="true" android:xlargeScreens="true" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application android:hardwareAccelerated="true" android:icon="@mipmap/icon" android:label="@string/app_name" android:supportsRtl="true">
        <activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale" android:label="@string/activity_name" android:launchMode="singleTop" android:name="MainActivity" android:screenOrientation="portrait" android:theme="@android:style/Theme.DeviceDefault.NoActionBar" android:windowSoftInputMode="adjustResize">
            <intent-filter android:label="@string/launcher_name">
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <provider
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true"
            android:name="android.support.v4.content.FileProvider">
            <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths" />
        </provider>
    </application>
    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="22" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

</manifest>

请注意，我从清单中删除了包名称（对于此 post 仅在堆栈上，在我的构建中有名称）

如果我使用 minifyenabled false 删除混淆器，应用程序就可以正常处理相机。

我不知道什么是缩小的，我应该添加以保留？或者您是否有提示/技巧来发现我的方法有什么问题？

谢谢。

Answer 1

嗨，我解决了同样的问题。有没有 classnotfounderror？在我的问题中，NPE 底部有一个 classnotfoundexception。在我添加 unfound class in proguard-rules 之后，问题就解决了。

我的问题记录如下 java.lang.ClassNotFoundException: com.xyz.XYZ.BuildConfig

Uncaught exception from plugin java.lang.NullPointerException: 
Attempt to invoke virtual method 'android.content.res.XmlResourceParser 
android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
                                                                       at android.support.v4.content.FileProvider.parsePathStrategy(Unknown Source)
                                                                       at android.support.v4.content.FileProvider.getPathStrategy(Unknown Source)
                                                                       at android.support.v4.content.FileProvider.getUriForFile(Unknown Source)
                                                                       at org.apache.cordova.camera.CameraLauncher.takePicture(Unknown Source)
                                                                       at org.apache.cordova.camera.CameraLauncher.callTakePicture(Unknown Source)
                                                                       at org.apache.cordova.camera.CameraLauncher.execute(Unknown Source)
                                                                       at org.apache.cordova.CordovaPlugin.execute(Unknown Source)
                                                                       at org.apache.cordova.PluginManager.exec(Unknown Source)
                                                                       at org.apache.cordova.CordovaBridge.jsExec(Unknown Source)
                                                                       at org.apache.cordova.engine.SystemExposedJsApi.exec(Unknown Source)
                                                                       at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
                                                                       at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:7)
                                                                       at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                       at android.os.Looper.loop(Looper.java:145)
                                                                       at android.os.HandlerThread.run(HandlerThread.java:61)
09-03 11:38:37.630 6926-6926/com.xyz.XYZ D/SystemWebChromeClient: file:///android_asset/www/js/bundles/fileUploadMobile_bundle.js: Line 1 : Failed because: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
09-03 11:38:37.630 6926-6926/com.xyz.XYZ I/chromium: [INFO:CONSOLE(1)] "Failed because: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference", source: file:///android_asset/www/js/bundles/fileUploadMobile_bundle.js (1)
09-03 11:38:37.690 6926-9554/com.xyz.XYZ D/BuildHelper: Unable to get the BuildConfig, is this built with ANT?
09-03 11:38:37.690 6926-9554/com.xyz.XYZ W/System.err: **java.lang.ClassNotFoundException: com.xyz.XYZ.BuildConfig**

之后在 proguard-rules 中添加该行

-keep public class com.xyz.XYZ.BuildConfig     
-keepclassmembers class com.xyz.XYZ.BuildConfig {        public *;     }

Answer 2

在 Manifest 文件中添加这个，在 application 标签内。我试过了它有效

这是我的清单 xml 文件中的提供商部分：

 <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
    </provider>

Answer 3

我也遇到了同样的问题，以下解决了我的问题：

更新 config.xml 文件。

打开项目文件夹中的 config.xml 文件。
在标签内，添加以下标签： <preference name="applicationId" value="{PACKAGE_ID}"/> 其中 {PACKAGE_ID} 替换为项目的 Android 包 ID。
保存 config.xml 文件。

参考：https://www.ibm.com/support/knowledgecenter/SSHS8R_7.1.0/com.ibm.worklight.dev.doc/dev/t_android_cam_api_24.html#t_android_cam_api_24

Answer 4

如果有人还卡在这个

将此行添加到您的混淆器规则中

-keep class com.abc.xyz.BuildConfig { *; }

其中 com.abc.xyz 是您的包名称

就是这样......

待会儿谢谢我...

快乐编码

Cordova 和 proguard：takePicture 上的相机插件 NPE

Cordova and proguard : Camera Plugin NPE on takePicture

android

cordova

plugins

proguard

cordova-plugin-proguard