[英]Embed OSGi Felix in Android
我的問題與舊的未解決問題Android 嵌入式 Felix 缺少需求 osgi.ee非常相關。
我只是將OSGi Felix 5.4.0 的一個實例嵌入到一個 Android 應用程序中,並嘗試在其中安裝一個純 Java非常簡單的 Bundle,由以下代碼表示:
@Component
public class ExampleBattery
{
@Activate
public void activate()
{
Thread t = new Thread(new Work());
t.start();
}
private class Work implements Runnable
{
boolean continueLoop = true;
@Override
public void run()
{
while (continueLoop)
{
System.out.println("hello");
try
{
Thread.sleep(2500);
}
catch (InterruptedException e)
{
continueLoop = false;
}
}
}
}
}
這顯然需要osgi.ee=JavaSE在它自己的清單中:
Manifest-Version: 1.0
Bnd-LastModified: 1448019954932
Bundle-ManifestVersion: 2
Bundle-Name: ExampleBattery.ExampleBattery
Bundle-SymbolicName: ExampleBattery.ExampleBattery
Bundle-Version: 1.0.0
Created-By: 1.8.0_66 (Oracle Corporation)
Private-Package: user.producer.battery
Require-Capability: osgi.ee;filter:="(&(osgi.ee=JavaSE)(version=1.7))"
Service-Component: OSGI-INF/user.producer.battery.ExampleBattery.xml
Tool: Bnd-3.0.0.201509101326
以下代碼顯示了我在 Android 應用程序中的具體操作:
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
launchFramework();
}
private void launchFramework()
{
// properties Map for the Felix instance
Map<String, String> configMap = configMap = new HashMap<String, String>();
// set some properties (like Felix's cache directory, etc.)
configMap.put("felix.cache.rootdir", felixBaseDir);
configMap.put("org.osgi.framework.storage", FELIX_CACHE_DIR_NAME);
try
{
// create and initialize the instance of the Framework
this.felixInstance = new Felix(configMap);
this.felixInstance.init();
Log.i("Felix", "Framework successfully created and initialized");
// simply use the Bundle context of the Felix
// instance to install ExampleBattery from the project's assets folder
installBasicBundlesFromAssets();
Log.i("Felix", "All basic Bundles installed successfully");
// start the framework
this.felixInstance.start();
Log.i("Felix", "Framework successfully started");
//
Log.i("Felix", "Starting installed Bundles ...");
// simply call "start()" on all the installed Bundles
if (startInstalledBundles())
{
Log.i("Felix", "ALL OK");
}
}
catch (Exception ex)
{
Log.e("Felix", "Could not create framework: " + ex);
return;
}
}
看起來很簡單,但是當我嘗試啟動ExampleBattery Bundle 時出現以下錯誤:
03-29 05:29:44.942:E/Felix(8156):無法啟動捆綁包“ExampleBattery.ExampleBattery”:org.osgi.framework.BundleException:無法解析ExampleBattery.ExampleBattery [1](R 1.0):丟失要求 [ExampleBattery.ExampleBattery [1](R 1.0)] osgi.ee; (&(osgi.ee=JavaSE)(version=1.7)) 未解決的需求:[[ExampleBattery.ExampleBattery [1](R 1.0)] osgi.ee; (&(osgi.ee=JavaSE)(version=1.7))]
這種情況很奇怪,因為 Felix 默認使用felix.jar 中的default.properties配置文件導出 Java:
....
org.osgi.framework.system.capabilities=${eecap-${java.specification.version}}eecap-1.8=osgi.ee; osgi.ee="OSGi/最低"; version:List="1.0,1.1,1.2", osgi.ee; osgi.ee="JavaSE"; 版本:List="1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8"
eecap-1.7 = osgi.ee; osgi.ee="OSGi/最低"; version:List="1.0,1.1,1.2", osgi.ee; osgi.ee="JavaSE"; 版本:List="1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7"
....
我真的不知道發生了什么,謝謝大家的回答。
我可以通過將以下屬性設置為 felix 來解決該問題:
configMap.put(Constants.FRAMEWORK_SYSTEMCAPABILITIES, "osgi.ee; osgi.ee=\"JavaSE\";version:List=\"1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8\"");
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