Android反射问题， InvocationTargetException

Question

通过反射调用私有无参函数，函数内部：

     private int TargetFunction()
    {
        Log.d("DEBUG","进入了宿主函数TargetFunction");
        Dialog alertDialog = new AlertDialog.Builder(MainActivity.this).
                setTitle("确定删除？").
                setMessage("您确定删除该条信息吗？").
                setIcon(R.mipmap.ic_launcher).
                setPositiveButton("确定", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        myFunction();
                    }
                }).
                setNegativeButton("取消", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                    }
                }).
                setNeutralButton("查看详情", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                    }
                }).
                create();
        alertDialog.show();
        return 9991;
    }

当调用之后可以成功进入该函数内，但随即抛错，log信息如下：

 进入了宿主函数TargetFunction
java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at tools.unicorn.dexinject.MyApplication.abcd(MyApplication.java:55)
    at tools.unicorn.dexinject.MyApplication.dexInject(MyApplication.java:21)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.aninterface.hook.hook_target.MainActivity.loadUninstallApk(MainActivity.java:123)
    at com.aninterface.hook.hook_target.MainActivity.access$100(MainActivity.java:22)
    at com.aninterface.hook.hook_target.MainActivity$2.onClick(MainActivity.java:39)
    at android.view.View.performClick(View.java:4780)
    at android.view.View$PerformClick.run(View.java:19866)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
    at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:149)
    at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:99)
    at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:154)
    at android.app.AlertDialog$Builder.<init>(AlertDialog.java:379)
    at com.aninterface.hook.hook_target.MainActivity.TargetFunction(MainActivity.java:46)
    ... 19 more

不知有谁遇到过这样的问题，小弟实在是找不到原因了