我将Knopflerfish框架嵌入到Android应用程序中，以动态启动和停止捆绑。
我按照this教程，下载了framework.jar frome this链接，并将其添加到我的eclipse项目中的类路径中。
此外，下面是Activity类，它启动框架并启动一个包：
package com.example.knopflerfish_android;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Map;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
import org.knopflerfish.framework.FrameworkFactoryImpl;
import org.osgi.framework.BundleException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.launch.Framework;
import org.osgi.framework.launch.FrameworkFactory;
import org.osgi.service.startlevel.StartLevel;
public class MainActivity extends Activity {
private static final String TAG = "Zaid Log";
private Framework mFramework;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
System.out.println("here!");
Map<String, String> fwprops = new Hashtable<String, String>(); //CHANGED
// add any framework properties to fwprops
fwprops.put("org.osgi.framework.storage", "sdcard/fwdir");
FrameworkFactory ff = new FrameworkFactoryImpl();
mFramework = ff.newFramework(fwprops);
try {
mFramework.init(); //STUCK HERE!!
} catch (BundleException be) {
// framework initialization failed
Log.d(TAG, be.getStackTrace().toString());
Log.d(TAG,"failed to initialize Framework");
}
setInitlevel(1);
installBundle("Bundle_AndroidAPI_1.0.0.201308160327.jar");
startBundle("Bundle_AndroidAPI_1.0.0.201308160327.jar");
// install/start other bundles...
setStartLevel(10);
try {
mFramework.start();
} catch (BundleException be) {
Log.e(TAG, be.toString());
// framework start failed
}
Log.d(TAG, "OSGi framework running, state: " + mFramework.getState());
/* helloServiceReference= context.getServiceReference(HelloService.class.getName());
HelloService helloService =(HelloService)context.getService(helloServiceReference);
System.out.println(helloService.sayHello());*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void startBundle(String bundle) {
Log.d(TAG, "starting bundle " + bundle);
InputStream bs;
try {
bs = getAssets().open("bundles/" + bundle);
} catch (IOException e) {
Log.e(TAG, e.toString());
return;
}
long bid = -1;
org.osgi.framework.Bundle[] bl = mFramework.getBundleContext().getBundles();
for (int i = 0; bl != null && i < bl.length; i++) {
if (bundle.equals(bl[i].getLocation())) {
bid = bl[i].getBundleId();
}
}
org.osgi.framework.Bundle b = mFramework.getBundleContext().getBundle(bid);
if (b == null) {
Log.e(TAG, "can't start bundle " + bundle);
return;
}
try {
b.start(org.osgi.framework.Bundle.START_ACTIVATION_POLICY);
Log.d(TAG, "bundle " + b.getSymbolicName() + "/" + b.getBundleId() + "/"
+ b + " started");
Toast.makeText(getApplicationContext(),"bundle " + b.getSymbolicName() + "/" + b.getBundleId() + "/"
+ b + " started" , Toast.LENGTH_SHORT).show();
} catch (BundleException be) {
Log.e(TAG, be.toString());
}
try {
bs.close();
} catch (IOException e) {
Log.e(TAG, e.toString());
}
}
private void installBundle(String bundle) {
Log.d(TAG, "installing bundle " + bundle);
Toast.makeText(getApplicationContext(), "installing bundle", Toast.LENGTH_SHORT).show();
InputStream bs;
try {
bs = getAssets().open("bundles/" + bundle);
} catch (IOException e) {
Log.e(TAG, e.toString());
return;
}
try {
mFramework.getBundleContext().installBundle(bundle, bs);
Log.d(TAG, "bundle " + bundle + " installed");
Toast.makeText(getApplicationContext(), "bundle " + bundle + " installed", Toast.LENGTH_SHORT).show();
} catch (BundleException be) {
Log.e(TAG, be.toString());
}
try {
bs.close();
} catch (IOException e) {
Log.e(TAG, e.toString());
}
}
private void setStartLevel(int startLevel) {
ServiceReference sr = mFramework.getBundleContext()
.getServiceReference(StartLevel.class.getName());
if (sr != null) {
StartLevel ss =
(StartLevel)mFramework.getBundleContext().getService(sr);
ss.setStartLevel(startLevel);
mFramework.getBundleContext().ungetService(sr);
} else {
Log.e(TAG, "No start level service " + startLevel);
}
}
private void setInitlevel(int level) {
ServiceReference sr = mFramework.getBundleContext()
.getServiceReference(StartLevel.class.getName());
if (sr != null) {
StartLevel ss =
(StartLevel)mFramework.getBundleContext().getService(sr);
ss.setInitialBundleStartLevel(level);
mFramework.getBundleContext().ungetService(sr);
Log.d(TAG, "initlevel " + level + " set");
} else {
Log.e(TAG, "No start level service " + level);
}
}
}
正如我在previous question中所说，根据this帖子中的@ldx，“我在Knopflerfish中为更好的Android / Dalvik支持提交的补丁已合并，因此修补和重新编译KF不应该是必要的：“
因此我没有添加任何内容，因为我的代码已经足够了。
当我运行Android应用程序时，我没有收到任何错误，相反，我在我的LogCat上收到正面消息，说我的软件包已安装并启动。请参阅下面的我的日志（我忽略前两行）：
08-15 23:32:08.381: E/Trace(22044): error opening trace file: No such file or directory (2)
08-15 23:32:08.381: E/Trace(22044): error opening trace file: No such file or directory (2)
08-15 23:32:09.441: I/System.out(22044): here!
08-15 23:32:10.320: D/dalvikvm(22044): GC_CONCURRENT freed 172K, 10% free 2695K/2984K, paused 73ms+85ms, total 236ms
08-15 23:32:10.720: D/dalvikvm(22044): GC_CONCURRENT freed 324K, 14% free 2816K/3260K, paused 73ms+85ms, total 214ms
08-15 23:32:10.762: D/Zaid Log(22044): initlevel 1 set
08-15 23:32:10.762: D/Zaid Log(22044): installing bundle Bundle_AndroidAPI_1.0.0.201308160327.jar
08-15 23:32:11.060: D/Zaid Log(22044): bundle Bundle_AndroidAPI_1.0.0.201308160327.jar installed
08-15 23:32:11.080: D/Zaid Log(22044): starting bundle Bundle_AndroidAPI_1.0.0.201308160327.jar
08-15 23:32:11.090: D/Zaid Log(22044): bundle Bundle_AndroidAPI/4/BundleImpl[id=4] started
08-15 23:32:11.140: D/Zaid Log(22044): OSGi framework running, state: 32
08-15 23:32:12.012: D/gralloc_goldfish(22044): Emulator without GPU emulation detected.
08-15 23:32:52.941: I/Choreographer(22044): Skipped 47 frames! The application may be doing too much work on its main thread.
然而，我的捆绑并没有真正开始。如果我的包真正开始，那么bundle的start方法中的消息将显示在LogCat上。以下是我的捆绑启动方法：
public void start(BundleContext bundleContext) throws Exception {
Activator.context = bundleContext;
System.out.println("Hello World. I am the OSGI_Android_Bundle!");
}
请注意，我的捆绑包已经过中毒，但它并没有在我的应用中启动。我哪里出错了？
更新1：我认为我应该将框架的开头与套装的开头交换。本教程的作者首先启动了bundle，但我想改变它，因为首先启动框架是有意义的，所以我更新的代码有以下内容：
setInitlevel(1);
// install/start other bundles...
setStartLevel(10);
try {
mFramework.start();
} catch (BundleException be) {
Log.e(TAG, be.toString());
// framework start failed
}
Log.d(TAG, "OSGi framework running, state: " + mFramework.getState());
installBundle("Bundle-Test_1.0.0.201308160536.jar");
startBundle("Bundle-Test_1.0.0.201308160536.jar");
现在，日志没有显示我的包像以前一样启动，而是告诉我不支持执行环境。请参阅下面更新的LogCat：
08-16 01:43:06.821: I/System.out(22737): here!
08-16 01:43:08.080: D/dalvikvm(22737): GC_CONCURRENT freed 191K, 11% free 2656K/2968K, paused 35ms+18ms, total 155ms
08-16 01:43:09.010: D/dalvikvm(22737): GC_CONCURRENT freed 276K, 13% free 2806K/3200K, paused 25ms+15ms, total 110ms
08-16 01:43:09.238: D/Zaid Log(22737): initlevel 1 set
08-16 01:43:09.300: D/Zaid Log(22737): OSGi framework running, state: 32
08-16 01:43:09.300: D/Zaid Log(22737): installing bundle Bundle-Test_1.0.0.201308160536.jar
08-16 01:43:09.530: D/Zaid Log(22737): bundle Bundle-Test_1.0.0.201308160536.jar installed
08-16 01:43:09.540: D/Zaid Log(22737): starting bundle Bundle-Test_1.0.0.201308160536.jar
08-16 01:43:09.550: E/Zaid Log(22737): org.osgi.framework.BundleException: Bundle#5, unable to resolve: Execution environment 'J2SE-1.5' is not supported
08-16 01:43:10.740: D/gralloc_goldfish(22737): Emulator without GPU emulation detected.
更新2：我在@ Neil的回答下面从我的捆绑MANIFEST中删除了这一行，
Bundle-RequiredExecutionEnvironment: J2SE-1.5
但是这导致了以下错误：
org.osgi.framework.BundleException: Bundle#6 start failed
也许，我不应该交换启动框架和启动捆绑包的顺序。以下是我更新的LogCat。
08-16 17:02:33.855: E/Trace(28805): error opening trace file: No such file or directory (2)
08-16 17:02:35.111: I/System.out(28805): here!
08-16 17:02:35.591: D/dalvikvm(28805): GC_CONCURRENT freed 199K, 11% free 2679K/2996K, paused 76ms+93ms, total 246ms
08-16 17:02:36.153: D/dalvikvm(28805): GC_CONCURRENT freed 268K, 13% free 2814K/3200K, paused 77ms+141ms, total 297ms
08-16 17:02:36.451: D/Zaid Log(28805): initlevel 1 set
08-16 17:02:36.531: D/Zaid Log(28805): OSGi framework running, state: 32
08-16 17:02:36.531: D/Zaid Log(28805): installing bundle Bundle-Test_1.0.0.201308161323.jar
08-16 17:02:36.611: D/Zaid Log(28805): bundle Bundle-Test_1.0.0.201308161323.jar installed
08-16 17:02:36.631: D/Zaid Log(28805): starting bundle Bundle-Test_1.0.0.201308161323.jar
08-16 17:02:36.646: E/Zaid Log(28805): org.osgi.framework.BundleException: Bundle#6 start failed
08-16 17:02:36.646: E/Zaid Log(28805): More:Bundle#6 start failed
08-16 17:02:36.681: W/System.err(28805): org.osgi.framework.BundleException: Bundle#6 start failed
08-16 17:02:36.681: W/System.err(28805): at org.knopflerfish.framework.BundleImpl.start0(BundleImpl.java:421)
08-16 17:02:36.681: W/System.err(28805): at org.knopflerfish.framework.BundleThread.run(BundleThread.java:145)
08-16 17:02:36.681: W/System.err(28805): Caused by: java.lang.ClassNotFoundException: bundle_test.Activator
08-16 17:02:36.681: W/System.err(28805): at org.knopflerfish.framework.BundleClassLoader.findClass(BundleClassLoader.java:218)
08-16 17:02:36.681: W/System.err(28805): at org.knopflerfish.framework.BundleClassLoader.loadClass(BundleClassLoader.java:347)
08-16 17:02:36.681: W/System.err(28805): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
08-16 17:02:36.694: W/System.err(28805): at org.knopflerfish.framework.BundleImpl.start0(BundleImpl.java:382)
08-16 17:02:36.694: W/System.err(28805): ... 1 more
08-16 17:02:37.282: I/Choreographer(28805): Skipped 34 frames! The application may be doing too much work on its main thread.
08-16 17:02:37.551: D/gralloc_goldfish(28805): Emulator without GPU emulation detected.
答案 0 :(得分：2)
我只会解决您更新后的问题中的错误，因为似乎第一个问题已修复（请确认）。
错误意味着捆绑包包含以下要求：
Bundle-RequiredExecutionEnvironment: J2SE-1.5
换句话说，bundle断言它需要标准的Java 5或更高版本。这称为执行环境或EE。通常，OSGi框架会检测您启动它的Java运行时类型，并发布一组与之匹配的EE。例如，如果您在标准Java 5上运行，框架会将名为J2SE-1.5，J2SE-1.4等的EE发布回JRE-1.0，因为Java 5向后兼容所有这些版本。但是，如果您有一个声明Bundle-RequiredExecutionEnvironment: JavaSE-1.6并且您尝试在Java 5上运行它的bundle，那么它将无法解析。
现在，您正在尝试在Android上运行，这不是标准的Java。虽然与标准Java类似，但标准JRE API的许多部分已被删除。因此，需要标准Java 5 的捆绑包不应在Android上解析，因为它可能会尝试调用该平台上不存在的API。
您可能最容易的事情是从未解析的包中删除Bundle-RequiredExecutionEnvironment标头。这将允许它安装和解决，但当然，如果确实需要调用Android上不存在的标准JRE中的方法，它可能会因运行时错误而失败。