PathClassLoader和DexClassLoader

动态加载.apk、.jar和.dex文件而且路径不受限制

4.1之后的版本中，不允许直接加载外部jar包

final File dexOutputPath =new File(Environment.getExternalStorageDirectory().toString() + File.separator + "dextest/Demojar-dex.jar"); File dir = this.getDir("out-dex", 0); DexClassLoader cl = new DexClassLoader(dexOutputPath.getAbsolutePath(), dir.getAbsolutePath(), null, getClassLoader());