改进2 java空指针对象引用
嗨，我正在尝试使用改型解析JSON，将其保存在Sqlite上并显示在RecyclerView上。但是，当我尝试打开活动时，我的应用程序崩溃。 下面是我的相关活动的完整代码。你能帮我解决这个问题吗？ 多谢各位改进2 java空指针对象引用,java,android,nullpointerexception,retrofit2,Java,Android,Nullpointerexception,Retrofit2,嗨，我正在尝试使用改型解析JSON，将其保存在Sqlite上并显示在RecyclerView上。但是，当我尝试打开活动时，我的应用程序崩溃。 下面是我的相关活动的完整代码。你能帮我解决这个问题吗？ 多谢各位 public class InventoryProductActivity extends AppCompatActivity implements InventoryProductListAdapter.CustomClickListener { private static f
public class InventoryProductActivity extends AppCompatActivity implements InventoryProductListAdapter.CustomClickListener {
private static final String TAG = InventoryProductActivity.class.getSimpleName();
private InventoryProductListAdapter mInventoryProductListAdapter;
private RecyclerView mRecyclerView;
private RetrofitClient mRetrofitClient;
LinearLayoutManager mLinearLayoutManager;
private WarehouseDatabase mDatabase;
private ProgressDialog mProgressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_inventory_product);
configViews();
mRetrofitClient = new RetrofitClient();
mDatabase = new WarehouseDatabase(this);
loadInventoryProductFeed();
}
private void configViews() {
mRecyclerView = findViewById(R.id.recycler_view_inventory_product);
mRecyclerView.setHasFixedSize(true);
mLinearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLinearLayoutManager);
mInventoryProductListAdapter = new InventoryProductListAdapter(this);
mRecyclerView.setAdapter(mInventoryProductListAdapter);
}
private void loadInventoryProductFeed() {
mProgressDialog = new ProgressDialog(InventoryProductActivity.this);
mProgressDialog.setMessage("Loading Inventory Data...");
mProgressDialog.setCancelable(true);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
mProgressDialog.setIndeterminate(true);
mProgressDialog.show();
mInventoryProductListAdapter.reset();
if (getNetworkAvailability()) {
getFeed();
} else {
getFeedFromDatabase();
}
}
private void getFeed() {
Call<List<InventoryProductModel>> listCall = mRetrofitClient.getWarehouseServiceInventoryProduct().getAllInventoryProducts();
listCall.enqueue(new Callback<List<InventoryProductModel>>() {
@Override
public void onResponse(Call<List<InventoryProductModel>> call, Response<List<InventoryProductModel>> response) {
if (response.isSuccessful()) {
List<InventoryProductModel> inventoryProductModelList = response.body();
for (int i = 0; i < inventoryProductModelList.size(); i++) {
InventoryProductModel inventoryProductModel = inventoryProductModelList.get(i);
mInventoryProductListAdapter.notifyDataSetChanged();
}
} else {
int sc = response.code();
switch (sc) {
}
}
mProgressDialog.dismiss();
}
@Override
public void onFailure(Call<List<InventoryProductModel>> call, Throwable t) {
mProgressDialog.dismiss();
Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
private void getFeedFromDatabase() {
List<InventoryProductModel> inventoryProductModelList = mDatabase.getInventoryProducts();
for (int i = 0; i < inventoryProductModelList.size(); i++) {
InventoryProductModel inventoryProductModel = inventoryProductModelList.get(i);
Log.d(TAG, inventoryProductModel.getName() + "||" + inventoryProductModel.getCountryId());
}
mProgressDialog.dismiss();
}
private boolean getNetworkAvailability() {
return Utils.isNetworkAvailable(getApplicationContext());
}
@Override
public void onClick(int position) {
}
}
您应该在此方法内设置断点，并检查发生的情况或向此方法添加一些日志。Hello。谢谢你的回复。基本url中似乎输入错误。它告诉我链接必须以/结尾。
getWarehouseServiceInventoryProduct()