InputStream is = this.getAssets().open("classes.jar");
String dexPath =
"/data/data/"+this.getPackageName()+"/";
FileOutputStream fos = new
FileOutputStream(dexPath + "classes.jar");
byte[] buffer = new
byte[1024];
int i =
0;
while((i=is.read(buffer))!=-1){
fos.write(buffer, 0,
i);
}
fos.flush();
fos.close();
is.close();
Log.e("test",
"111");
DexClassLoader dexClassLoader = new DexClassLoader(dexPath +
"classes.jar", dexPath, null,
this.getClassLoader().getParent());
Object currentActivityThread =
RefInvoke.invokeStaticMethod(
"android.app.ActivityThread", "currentActivityThread",
new
Class[] {}, new Object[] {});
String packageName =
this.getPackageName();
HashMap mPackages = (HashMap)
RefInvoke.getFieldOjbect(
"android.app.ActivityThread",
currentActivityThread,
"mPackages");
WeakReference wr = (WeakReference) mPackages.get(packageName);
RefInvoke.setFieldOjbect("android.app.LoadedApk", "mClassLoader",
this.getClassLoader(), dexClassLoader);
android dexclassloader类加载器,布布扣,bubuko.com
原文：http://www.cnblogs.com/manbu/p/3615860.html