Android_反射技术_调用类中私有的方法

public class DemoActivity extends Activity {
private PackageManager pm;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pm = getPackageManager();

         try {
  Method method = PackageManager.class.getMethod("getPackageSizeInfo", new Class[]{String.class,IPackageStatsObserver.class});

method.invoke(pm, new Object[]{"cn.itcast.mobilesafe",new IPackageStatsObserver.Stub() {

public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)
throws RemoteException {
System.out.println("----------------");
long cachesize = pStats.cacheSize;
long codesize = pStats.codeSize;
long datasize = pStats.dataSize;
System.out.println("datasize"+datasize);
System.out.println("codesize"+codesize);
System.out.println("cachesize"+cachesize);

}
}});

} catch (Exception e) {
e.printStackTrace();
}

/*        Method[] methods = PackageManager.class.getMethods();
for (int i = 0; i < methods.length; i++) {
if ("getPackageSizeInfo".equals(methods[i].getName())) {
Class<?>[]  paras = methods[i].getParameterTypes();
for(int j=0;j<paras.length;j++){
System.out.println(paras[j]);
}
}
}*/
}
}