DexClassLoader的使用

Dear 丶 2022-08-04 12:36 13阅读 0赞

DexClassLoader此处用于从一个应用调用另外一个插件apk的用法：

在插件apk中定义方法：

**public class**PluginClass \{

public PluginClass() {
            Log.i("Plugin", "PluginClass client initialized");
        }
    
        public int testfunction(int a, int b) {
            return a + b;
        }
    }

插件apk中的mainfest:

然后在另外的apk中调用：

public void useDexClassLoader() {
        Intent intent = new Intent("cn.edu.uestc.plugin.client", null);//此处是插件apk的action的name
        PackageManager pm = getPackageManager();
        final List<ResolveInfo> plugins = pm.queryIntentActivities(intent, 0);
        ResolveInfo rinfo = plugins.get(0);
        ActivityInfo ainfo = rinfo.activityInfo;
    
        String div = System.getProperty("path.separator");
        String packageName = ainfo.packageName;
        String dexPath = ainfo.applicationInfo.sourceDir;
        String dexOutputDir = getApplicationInfo().dataDir;
        String libPath = ainfo.applicationInfo.nativeLibraryDir;
    
        DexClassLoader cl = new DexClassLoader(dexPath,
                dexOutputDir, libPath, this.getClass().getClassLoader());
    
        try {
            Class<?> clazz = cl.loadClass(packageName + ".PluginClass");
            Object obj = clazz.newInstance();//调用PluginClass的构造方法
            Class[] params = new Class[2];//方法的参数
            params[0] = Integer.TYPE;
            params[1] = Integer.TYPE;
            Method action = clazz.getMethod("testfunction",params);//获取方法
            Integer ret = (Integer)action.invoke(obj, 12, 34);//使用反射来调用方法
            Log.i("Host", "return value is " + ret);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }
    
    }