錯誤訊息:

java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference

他是說我的setLayoutManager是空的 想了想
我的猜測是 "我的Re1沒有被宣告" 也就是我的initView沒有被執行!?
先說如果不是用從其他頁呼叫 是使用我的onLazyLoad看到畫面執行 這部分是正常的

呼叫:

 Fragment1 fragment = new Fragment1();
                fragment.change();

Fragment1

public class Fragment1 extends BaseLazyFragment {

    private String url = "http://211.22.XXX.XXX/xampp/";
    private RecyclerView Re1;
    private int page = 1,run=0;
    private String user_id,phone,cookie;
    private TextView text1,text2,text3;
    private Context context;
    private boolean isFirstLoad = false;
    private RecyclerView.LayoutManager mLayoutManager;

    @Override
    public void onLazyLoad() {
        initData();
        isFirstLoad =true;
    }
    有成功執行這個change
    public void change(){
        Log.e("change",toString());
        initData();
        run =1;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_fragment1, container, false);

        initView(view);
        context = view.getContext();
        if(isFirstLoad){
            initData();
        }
        return view;
    }
    private void initView(View view){
        Re1 = view.findViewById(R.id.Re1_tab1);
        GlobalVariable Account = (GlobalVariable)getActivity().getApplicationContext();
        user_id = Account.getUser_id();
        phone = Account.getPhone();
        cookie = Account.getCookie();


    }

    private void initData(){

        //除錯用
        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
                .detectDiskReads()
                .detectDiskWrites()
                .detectNetwork()   // or .detectAll() for all detectable problems
                .penaltyLog()
                .build());
        StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
                .detectLeakedSqlLiteObjects()
                .detectLeakedClosableObjects()
                .penaltyLog()
                .penaltyDeath()
                .build());
        Handler myHandler = new Handler();//時間處理器
        myHandler.postDelayed(runTimerStop,400);//使Runnable 添加到Handler中，在指定的時間到時運行runTimerStop。
        if(cookie != null) {
            myHandler.removeCallbacks(runTimerStop);//removeCallbacks方法是删除指定的Runnable對象，使線程對象停止運行。
        }
    }
    private Runnable runTimerStop = new Runnable() {
        @Override
        public void run() {
            select(user_id);

           // dialog.dismiss();
        }
    };

    private void select(String id){
        try {
            String r = DBphp.DBstr(id,cookie,url);
            JSONArray jsonArray = new JSONArray(r);
            ArrayList<Rel_list> items = new ArrayList<Rel_list>();
            迴圈這邊正常
            for (int i=0;i<jsonArray.length();i++){
                JSONObject jsonData = jsonArray.getJSONObject(i);
                items.add(new Rel_list(jsonData.getString("id"),jsonData.getString("product_name"),jsonData.getString("specification")
                        ,jsonData.getString("selling_price"),jsonData.getString("operations_center"),jsonData.getString("inventory"),jsonData.getString("pictuture_id"),jsonData.getString("ANS")));
            }
          
            RelAdapter SA = new RelAdapter(getContext(),items);
         **   有問題的地方!!!**
            Re1.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
            Re1.setAdapter(SA);
            SA.setOnItemClickListener(new RelAdapter.OnItemClickListener() {
                @Override
                public void onItemClick(View view, int i) {
                  //  byte buff[] = new byte[125*250];
                    ImageView im0 = view.findViewById(R.id.img_id);
                    TextView te0 = view.findViewById(R.id.t1);
                    TextView te1 = view.findViewById(R.id.t2);
                    TextView te2 = view.findViewById(R.id.t3);
                    TextView te3 = view.findViewById(R.id.t4);
                    TextView te4 = view.findViewById(R.id.t5);
                    TextView te5 = view.findViewById(R.id.t6);
                    TextView te6 = view.findViewById(R.id.t7);
                    TextView te7 = view.findViewById(R.id.t14);
              //      love = view.findViewById(R.id.btn_love);
                  //  Bitmap bitmap = setimage(im0); //调用setimage方法，得到返回值bitmap
                    Intent intent= new Intent();//轉跳另一頁，並顯示帳密及信箱
                    intent.setClass(getContext(), shop_thing.class);
                    Bundle bundle = new Bundle();
                    bundle.putString("user_id",user_id);
                    bundle.putString("user_phone",phone);
                    bundle.putString("cookie",cookie);
                    bundle.putString("page", String.valueOf(page));
                    bundle.putString("shop_id",te0.getText().toString());
                    bundle.putString("shop_product_name",te1.getText().toString());
                    bundle.putString("shop_specification",te2.getText().toString());
                    bundle.putString("shop_selling_price",te3.getText().toString());
                    bundle.putString("shop_operations_center",te4.getText().toString());
                    bundle.putString("shop_inventory",te5.getText().toString());
                    bundle.putString("picture_id",te6.getText().toString());
                    bundle.putString("love",te7.getText().toString());

                    intent.putExtras(bundle);
                    startActivity(intent);
                }
            });
        }catch (Exception e){
            Log.e("error",e.toString());
        }
    }

}