在 APK Bundle 中使用 android API 给出:“找不到类 'android.content.Context'，从方法 com.example.patient.Activator.start 引用" [英] Using android API in APK Bundle gives: "Could not find class 'android.content.Context', referenced from method com.example.patient.Activator.start"

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问题描述

我正在将 OSGI 框架嵌入到 Android 应用程序中.除了我的 android 应用程序之外，我还有一个使用以下步骤创建的 APK 包:

I am embedding OSGI framework into Android application. Beside my android application, I have an APK bundle that I create using the following steps:

  • 创建常规 APK，例如通过创建 Eclipse Android项目.
  • 使您的包使用与您使用的相同的 OSGI 框架库应用程序:Build Path->Configure Build Path->Projects，然后添加将加载包的应用程序项目.您的应用程序项目中应包含 OSGI 框架 jar 文件构建路径，(在我的例子中是 felix.jar).
  • 创建描述包的包清单文件.你可以打电话它bundle.manifest.
  • 假设你的应用程序包是 com.acme.helloworld(这个值是使用 manifest:package 在 AndroidManifest.xml 中设置)，您的 OSGI 包的Activator 类必须放在 com.acme.helloworld 包中，并且您必须在包中设置 Bundle-SymbolicName: com.acme.helloworld显现.如果不满足这些条件中的任何一个，则将导致java.lang.NoClassDefFoundError 在运行时.
  • 使用 Android 工具 > 导出未签名的 Android 包
  • 将bundle.manifest复制到生成的未签名的根目录下APK 为 META-INF/MANIFEST.MF.您可以使用 Winzip 打开未签名的APK 并添加文件夹 META-INF.
  • 使用以下命令签署 APK:jarsigner -verbose -keystore/path_to_keystore/mykeystore.keystore my_application.apk my_keystore_alias.
  • 复制包含所有 .class 文件的目录android 项目到您签名的 apk 的根目录.就我而言:它是 com 目录.
  • 再次签署您的 APK.
  • 安装 APK 包.
  • 让 OSGi 框架加载并启动 APK 包(完全相同APK 文件)
  • Create a regular APK, for example by creating Eclipse Android Project.
  • Make your bundle use the same OSGI framework library used by your application by: Build Path->Configure Build Path->Projects, and then add your application project that will load the bundle. Your application project should contain the OSGI framework jar file in its build path, (in my case felix.jar).
  • Create the bundle manifest file describing the bundle. You can call it bundle.manifest.
  • Say your application package is com.acme.helloworld (this value is set with manifest:package in AndroidManifest.xml), your OSGI bundle's Activator class MUST be placed in the package com.acme.helloworld and you MUST set Bundle-SymbolicName: com.acme.helloworld in the bundle manifest. If any of these conditions is not met then will result in a java.lang.NoClassDefFoundError on runtime.
  • Use Android Tools > Export Unsigned Android Package
  • Copy bundle.manifest to the root directory of the generated unsigned APK as META-INF/MANIFEST.MF. You can use Winzip to open the unsigned APK and add the folder META-INF.
  • Sign the APK using the command: jarsigner -verbose -keystore /path_to_keystore/mykeystore.keystore my_application.apk my_keystore_alias.
  • Copy your directory that contains all the .class files from your android project to the root directory of your signed apk. In my case: it is the com directory.
  • Sign your APK once again.
  • Install the APK bundle.
  • Have the OSGi framework load and start the APK bundle (the very same APK file)

使用这些步骤，我成功地将 APK 包加载到 Felix 框架中，并且启动正常.

Using these steps, I successfully loaded the APK bundle to Felix framework, and It starts OK.

但是，我现在正在尝试启动 APK 包中存在的 Activity，因此我执行了以下操作:

However, I am now trying to launch an activity that exists in the APK bundle, so I did the following:

在我的应用程序项目中，我将应用程序上下文注册为服务以使其可用于 APK 包:

In my Application project, I register the application context as a service to make it available for the APK bundle:

 // Register the application's context as an OSGi service!
    BundleContext bundleContext = m_felix.getBundleContext();
    ServiceRegistration regContext = bundleContext.registerService(Context.class,
      getApplicationContext(), new Hashtable());

在我的 APK 包 start method() 中的 Activator 类:

In my APK bundle start method() in the Activator class:

ServiceReference<Context> ref = bundleContext.getServiceReference(Context.class);
final Context ctx = bundleContext.getService(ref);

Intent intent = new Intent();
String pkgName = View_Patient_File_Activity.class.getPackage().getName();
String clssName = View_Patient_File_Activity.class.getName();
intent.setClassName(pkgName, clssName);

// You may add the NEW_TASK flag
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

// Important: do not use startActivity(Context, Class) version because it will fail to resolve the activity
ctx.startActivity(intent);

当我运行我的应用程序项目时，由于以下错误而未安装包:

When I run my application project, the bundle is not installed because of the following errors:

11-26 20:07:06.600: W/dalvikvm(24646): VFY: unable to find class referenced in signature (Lorg/osgi/framework/BundleContext;)
11-26 20:07:06.600: W/dalvikvm(24646): VFY: unable to find class referenced in signature (Lorg/osgi/framework/BundleContext;)
11-26 20:07:06.600: E/dalvikvm(24646): Could not find class 'android.content.Context', referenced from method com.example.patient.Activator.start
11-26 20:07:06.600: W/dalvikvm(24646): VFY: unable to resolve const-class 25 (Landroid/content/Context;) in Lcom/example/patient/Activator;
11-26 20:07:06.600: D/dalvikvm(24646): VFY: replacing opcode 0x1c at 0x0009
11-26 20:07:06.600: W/dalvikvm(24646): VFY: unable to find class referenced in signature (Lorg/osgi/framework/BundleContext;)
11-26 20:07:06.600: W/dalvikvm(24646): Method mismatch: start in Lcom/example/patient/Activator; (cl=0x4072f3c0) and iface Lorg/osgi/framework/BundleActivator; (cl=0x40712e88)
11-26 20:07:06.600: W/dalvikvm(24646): Class init failed in newInstance call (Lcom/example/patient/Activator;)
11-26 20:07:06.600: E/Zaid Log(24646): Problem installing the bundle :s
11-26 20:07:06.600: W/System.err(24646): org.osgi.framework.BundleException: Activator start error in bundle com.example.patient [1].
11-26 20:07:06.600: W/System.err(24646):    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2196)
11-26 20:07:06.600: W/System.err(24646):    at org.apache.felix.framework.Felix.startBundle(Felix.java:2064)
11-26 20:07:06.600: W/System.err(24646):    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:955)
11-26 20:07:06.600: W/System.err(24646):    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:942)
11-26 20:07:06.600: W/System.err(24646):    at com.example.patient_application.MainActivity.onCreate(MainActivity.java:149)
11-26 20:07:06.600: W/System.err(24646):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
11-26 20:07:06.600: W/System.err(24646):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1715)
11-26 20:07:06.600: W/System.err(24646):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767)
11-26 20:07:06.600: W/System.err(24646):    at android.app.ActivityThread.access$1500(ActivityThread.java:122)
11-26 20:07:06.600: W/System.err(24646):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1005)
11-26 20:07:06.600: W/System.err(24646):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-26 20:07:06.600: W/System.err(24646):    at android.os.Looper.loop(Looper.java:132)
11-26 20:07:06.600: W/System.err(24646):    at android.app.ActivityThread.main(ActivityThread.java:4028)
11-26 20:07:06.600: W/System.err(24646):    at java.lang.reflect.Method.invokeNative(Native Method)
11-26 20:07:06.600: W/System.err(24646):    at java.lang.reflect.Method.invoke(Method.java:491)
11-26 20:07:06.600: W/System.err(24646):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
11-26 20:07:06.600: W/System.err(24646):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
11-26 20:07:06.600: W/System.err(24646):    at dalvik.system.NativeStart.main(Native Method)
11-26 20:07:06.600: W/System.err(24646): Caused by: java.lang.LinkageError: Classes resolve differently in interface
11-26 20:07:06.600: W/System.err(24646):    at java.lang.Class.newInstanceImpl(Native Method)
11-26 20:07:06.600: W/System.err(24646):    at java.lang.Class.newInstance(Class.java:1301)
11-26 20:07:06.600: W/System.err(24646):    at org.apache.felix.framework.Felix.createBundleActivator(Felix.java:4336)
11-26 20:07:06.600: W/System.err(24646):    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2141)
11-26 20:07:06.600: W/System.err(24646):    ... 17 more
11-26 20:07:06.610: V/TLINE(24646): new: android.text.TextLine@40782610
11-26 20:07:06.700: D/CLIPBOARD(24646): Hide Clipboard dialog at Starting input: finished by someone else... !

我像这样在我的应用程序项目中导出了 android 包:

I exported the android packages in my application project like this:

static final String ANDROID_FRAMEWORK_PACKAGES = (
            "android,"
            + "android.app,"
            + "android.content,"
            + "android.database,"
            + "android.database.sqlite,"
            + "android.graphics,"
            + "android.graphics.drawable,"
            + "android.graphics.glutils,"
            + "android.hardware,"
            + "android.location,"
            + "android.media,"
            + "android.net,"
            + "android.net.wifi,"
            + "android.opengl,"
            + "android.os,"
            + "android.provider,"
            + "android.sax,"
            + "android.speech.recognition,"
            + "android.telephony,"
            + "android.telephony.gsm,"
            + "android.text,"
            + "android.text.method,"
            + "android.text.style,"
            + "android.text.util,"
            + "android.util,"
            + "android.view,"
            + "android.view.animation,"
            + "android.webkit,"
            + "android.widget");


         m_configMap.put(Constants.FRAMEWORK_SYSTEMPACKAGES_EXTRA,
                ANDROID_FRAMEWORK_PACKAGES);

然后我将这些包导入到我的 APK 包中.下面是我的 MANIFEST.MF

And I import these packages in my APK bundle. Below is my MANIFEST.MF

Manifest-Version: 1.0
Bundle-Vendor: Zaid
Bundle-Version: 1.0.0
Bundle-Name: Patient
Bundle-ManifestVersion: 2
Bundle-Activator: com.example.patient.Activator
Bundle-Description: View Patient File
Bundle-SymbolicName: com.example.patient
Bundle-RequiredExecutionEnvironment: OSGi/Minimum-1.0
Import-Package: android, android.app, android.content, org.osgi.framework

同样的错误一再出现.有人可以帮忙吗?谢谢.

The same errors keep coming again and again. Can someone help? Thank you.

注意:我采用了这些想法中的大部分，以及之前有此主题经验的用户 @slash33 的代码.

Note: I took Most of these ideas, and the code from the user @slash33 who had a previous experience with this topic.

推荐答案

问题出在我的 MANIFEST.MF 文件中.我找不到错误，但我使用了文件的旧副本，然后所有错误都消失了.下面是我更新的 MANIFEST.MF 文件

The problem turned out to be in my MANIFEST.MF file. I could not locate the error, but I used an old copy of the file, and then all the errors disappeared. Below is my updated MANIFEST.MF file

Manifest-Version: 1.0
Bundle-Vendor: Zaid
Bundle-Version: 1.0.0
Bundle-Name: Patient
Bundle-ManifestVersion: 2
Bundle-Activator: com.example.patient.Activator
Bundle-Description: View Patient File
Import-Package: org.osgi.framework, android.content
Bundle-SymbolicName: com.example.patient
Bundle-RequiredExecutionEnvironment: OSGi/Minimum-1.0

我的 APK 包已成功加载到 Felix 框架，我现在可以在包内启动活动.感谢上帝！

My APK bundle was successfully loaded to Felix framework and I am now able to launch activities inside the bundle. Thanks God!

这篇关于在 APK Bundle 中使用 android API 给出:“找不到类 'android.content.Context'，从方法 com.example.patient.Activator.start 引用"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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