Recyclerview 在第一次创建活动时不加载

Question

我正在通过单击 recyclerview 活动中的按钮打开的 ADD 活动将项目添加到我的回收站列表中。但是当我添加并关闭 ADD 活动时，该项目不会显示在 recyclerview 活动中，除非我关闭它并再次打开它。

如果添加网络调用成功，我会得到一个 ID。然后我将 ID 添加到 sqlite，完成 ADD 活动并返回到我的 recyclerview 活动。我从 sqlite 获取 ID 并将其传递给网络调用函数以获取我的项目。

这是我的 Recyclerview 活动

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_subscriptions);

    db = SubscriptionDB.getInstance(this);
    sessionDBHelper = new SessionDBHelper(this);
    idDB = IDsDB.getInstance(this);


    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.floatAddSub);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent intent = new Intent(Subscriptions.this, AddSubscription.class);
            startActivity(intent);

        }
    });

    customerID = idDB.getCustomerID();

    progressBar = findViewById(R.id.progress_bar);
    recyclerview = (RecyclerView) findViewById(R.id.subscription_recycler);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
    recyclerview.setLayoutManager(mLayoutManager);
    recyclerview.setItemAnimator(new DefaultItemAnimator());

    fetchInfo(customerID);
    if (subArrayList.size() > 0) {
        adapter = new SubRVAdapter(subArrayList, this, this.getSupportFragmentManager());
        subArrayList = db.getAll();
        recyclerview.setAdapter(adapter);
        adapter.notifyDataSetChanged();
        progressBar.setVisibility(View.GONE);

    }
}

public void fetchInfo(String customerID) {
    apiInterface = RetrofitInstance.getRetrofitInstance().create(APIInterface.class);

    Call<ArrayList<SubObject>> call = apiInterface.getSubscription(customerID);

    progressBar.setVisibility(View.VISIBLE);

    call.enqueue(new Callback<ArrayList<SubObject>>() {
        @Override
        public void onResponse(Call<ArrayList<SubObject>> call, Response<ArrayList<SubObject>> response) {
            adapter = new SubRVAdapter(subArrayList, getApplicationContext(), getSupportFragmentManager());
            subArrayList = response.body();
            recyclerview.setAdapter(adapter);
            adapter.notifyDataSetChanged();
            progressBar.setVisibility(View.GONE);
            int statusCode = response.code();
            Log.d("onresponse", "" + statusCode);
        }

        @Override
        public void onFailure(Call<ArrayList<SubObject>> call, Throwable t) {
            progressBar.setVisibility(View.GONE);
            Log.d("onfailure", " " + t.getMessage());

            Toast.makeText(Subscriptions.this, "There is a network issue. Try again later.", Toast.LENGTH_SHORT).show();
            progressBar.setVisibility(View.GONE);

        }
    });
}



@Override
protected void onResume() {
    super.onResume();
    Log.d("onResume", "RESUME");

    fetchInfo(customerID);
    if (subArrayList.size() > 0) {
        adapter = new SubRVAdapter(subArrayList, this, this.getSupportFragmentManager());
        subArrayList = db.getAll();
        recyclerview.setAdapter(adapter);
        adapter.notifyDataSetChanged();

    }

}

ADD 活动

 APIInterface apiInterface = RetrofitInstance.getRetrofitInstance().create(APIInterface.class);
                    AddSubscriptionModel addSubscriptionModel = new AddSubscriptionModel();
                    addSubscriptionModel.setStickerNumber(stickerNumber);
                    addSubscriptionModel.setPin(Pin);
                    addSubscriptionModel.setUsername(username);
                    addSubscriptionModel.setPassword(password);
                    addSubscriptionModel.setEmail(phone);

                    Call<ArrayList<SubModel>> activate = apiInterface.addSubscription(addSubscriptionModel);
                    activate.enqueue(new Callback<ArrayList<SubModel>>() {
                        @Override
                        public void onResponse(Call<ArrayList<SubModel>> call, Response<ArrayList<SubModel>> response) {

                            if (response.isSuccessful()) {
                                int statusCode = response.code();

                                subsscriptions = response.body();

                                    String cusID = subsscriptions.get(0).getCustomer_id();
                                    String subID = subsscriptions.get(0).getSubscription_id();

                                    idDB.addCustomerID(cusID, subID);


                                }

                                Toast.makeText(AddSubscription.this, "SUCCESS", Toast.LENGTH_SHORT).show();
                                progressBar.setVisibility(View.GONE);
                                Log.d("onresponse", "" + statusCode);
                            }
                        }



                        @Override
                        public void onFailure(Call<ArrayList<SubModel>> call, Throwable t) {

                            Toast.makeText(AddSubscription.this, "Network issues", Toast.LENGTH_SHORT).show();
                            progressBar.setVisibility(View.GONE);
                            Log.d("onfailure"," " +  t . getMessage());


                        }
                    });

            finish();
        }
    });

link to logcat

Answer 1

你可以用这样的结果开始活动

fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent = new Intent(Subscriptions.this, AddSubscription.class);
        startActivityForResult(intent,1);
    }
});

完成 ADD 活动后，您将获得结果

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    customerID = idDB.getCustomerID();
    fetchInfo(customerID);
    if (subArrayList.size() > 0) {
        adapter = new SubRVAdapter(subArrayList, this, this.getSupportFragmentManager());
        subArrayList = db.getAll();
        recyclerview.setAdapter(adapter);
        adapter.notifyDataSetChanged();
        progressBar.setVisibility(View.GONE);
    }
}

而且您还必须等到获得 API 响应后，才能完成 ADD 活动

Call<ArrayList<SubModel>> activate = apiInterface.addSubscription(addSubscriptionModel);
activate.enqueue(new Callback<ArrayList<SubModel>>() {
    @Override
    public void onResponse(Call<ArrayList<SubModel>> call, Response<ArrayList<SubModel>> response) {
        if (response.isSuccessful()) {
            int statusCode = response.code();
            subsscriptions = response.body();
            String cusID = subsscriptions.get(0).getCustomer_id();
            String subID = subsscriptions.get(0).getSubscription_id();
            idDB.addCustomerID(cusID, subID);
        }
        Toast.makeText(AddSubscription.this, "SUCCESS", Toast.LENGTH_SHORT).show();
        progressBar.setVisibility(View.GONE);
        Log.d("onresponse", "" + statusCode);
        finish(); <-- add this
    }

    @Override
    public void onFailure(Call<ArrayList<SubModel>> call, Throwable t) {
        Toast.makeText(AddSubscription.this, "Network issues", Toast.LENGTH_SHORT).show();
        progressBar.setVisibility(View.GONE);
        Log.d("onfailure"," " +  t . getMessage());
        finish(); <-- add this
    }
});
//finish(); <-- remove this

Answer 2

这样做我刚刚编辑了你的代码

 @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_subscriptions);

db = SubscriptionDB.getInstance(this);
sessionDBHelper = new SessionDBHelper(this);
idDB = IDsDB.getInstance(this);


FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.floatAddSub);
fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        Intent intent = new Intent(Subscriptions.this, AddSubscription.class);
        startActivity(intent);

    }
});

customerID = idDB.getCustomerID();

progressBar = findViewById(R.id.progress_bar);
recyclerview = (RecyclerView) findViewById(R.id.subscription_recycler);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
recyclerview.setLayoutManager(mLayoutManager);
recyclerview.setItemAnimator(new DefaultItemAnimator());

fetchInfo(customerID);

}

private void loadDataInRecyclerView(){
    //if you have already data loaded from API then why are you again loading data from db.getAll();
    //if this is not necessary try commenting it
    subArrayList = db.getAll();
    adapter = new SubRVAdapter(subArrayList, this, this.getSupportFragmentManager());
    recyclerview.setAdapter(adapter);
    adapter.notifyDataSetChanged();
}

public void fetchInfo(String customerID) {
apiInterface = RetrofitInstance.getRetrofitInstance().create(APIInterface.class);
Call<ArrayList<SubObject>> call = apiInterface.getSubscription(customerID);
progressBar.setVisibility(View.VISIBLE);
call.enqueue(new Callback<ArrayList<SubObject>>() {
    @Override
    public void onResponse(Call<ArrayList<SubObject>> call, Response<ArrayList<SubObject>> response) {
        adapter = new SubRVAdapter(subArrayList, getApplicationContext(), getSupportFragmentManager());
        subArrayList = response.body();
        progressBar.setVisibility(View.GONE);
        int statusCode = response.code();
        if(subArrayList.size()==0){
            Log.i("No data" , "Inside Response : " + "");
        }else{
            loadDataInRecyclerView();
        }

        Log.d("onresponse", "" + statusCode);
    }

    @Override
    public void onFailure(Call<ArrayList<SubObject>> call, Throwable t) {
        progressBar.setVisibility(View.GONE);
        Log.d("onfailure", " " + t.getMessage());

        Toast.makeText(Subscriptions.this, "There is a network issue. Try again later.", Toast.LENGTH_SHORT).show();
        progressBar.setVisibility(View.GONE);

    }
});
}



@Override
protected void onResume() {
super.onResume();
Log.d("onResume", "RESUME");
fetchInfo(customerID);
if (subArrayList.size() > 0) {
    recyclerview.setAdapter(adapter);
    adapter.notifyDataSetChanged();
}}

让我知道这是否可行，仅供参考我已经在onCreate() 方法中进行了一些编辑，您的fetchInfo() 方法也注意fetchInfo() 方法中的我的 cmets