林创建一个包含2的EditText领域一个非常基本的片段和一个提交按钮。在提交的值应该被插入一个一行到我的SQLite数据库。结果即时得到一个NullPointerException异常,我只是不明白..
在我的片段IM的onCreateView方法让我的字段值,并建立一个点击监听,是这样的:
查看rootView = inflater.inflate(R.layout.fragment_add_customer,集装箱,FALSE); 客户名称=(EditText上)rootView.findViewById(R.id.editCompanyName); customerAddress =(EditText上)rootView.findViewById(R.id.editCompanyAddress); Add按钮=(按钮)rootView.findViewById(R.id.submitCustomerBtn); addButton.setOnClickListener(新View.OnClickListener(){ @覆盖 公共无效的onClick(查看视图){ 字符串sCustomerName = customerName.getText()的toString()。 字符串sCustomerAddress = customerAddress.getText()的toString()。 如果(sCustomerName.trim()长度()方式> 0&放大器;&放大器; sCustomerAddress.trim()长度()方式> 0){ 客户客户=新客户(); customer.setName(sCustomerName); customer.setAddress(sCustomerAddress); customer.setLocation(未设置); customer.setImage(无); 顾客= dataSource.createCustomer(客户); 如果(customer.getId()!= 0){ Toast.makeText(getActivity(),customer.getName()+ID为:+ customer.getId()+被创造!,Toast.LENGTH_LONG).show(); Log.i(LOGTAG,客户ID为创建+ customer.getId()); } }其他{ Toast.makeText(getActivity(),请填写所有字段。Toast.LENGTH_LONG).show(); } } }); 返回rootView;在我的DataSource类,其中i CONTROLE我的数据库查询和报表IM调用createCustomer方法,它看起来像这样:
公共客户createCustomer(客户的客户){ ContentValues值=新ContentValues(); values.put(BusinessDBOpenHelper.CUSTOMER_NAME,customer.getName()); values.put(BusinessDBOpenHelper.CUSTOMER_ADDRESS,customer.getAddress()); values.put(BusinessDBOpenHelper.CUSTOMER_LOCATION,customer.getLocation()); values.put(BusinessDBOpenHelper.CUSTOMER_IMAGE,customer.getImage()); 长insertid = database.insert(BusinessDBOpenHelper.TABLE_CUSTOMER,空,价值); customer.setId(insertid); 回报客户;}我的客户模型也只是containg长的ID,字符串名称,地址字符串,字符串位置,字符串图像的getter和setter ..结果空的例外是:
显示java.lang.NullPointerException:尝试调用虚拟方法org.example.app.model.Customer org.example.app.db.BusinessDataSource.createCustomer(org.example.app在一个空对象引用.model.Customer) 在org.example.app.AddCustomerFragment $ 1.onClick(Fragment.java:55)解决方案
您
dataSource.createCustomer(客户);为空,你必须初始化
数据源地方
Im creating a very basic fragment containing 2 EditText fields and a submit button. On submit the values should be inserted as a row to my SQLite DB. Im getting a NullPointerException i just dont get..
Inside my onCreateView method of the fragment im getting my field values and setting up a click listener like this:
View rootView = inflater.inflate(R.layout.fragment_add_customer, container, false); customerName = (EditText) rootView.findViewById(R.id.editCompanyName); customerAddress = (EditText) rootView.findViewById(R.id.editCompanyAddress); addButton = (Button) rootView.findViewById(R.id.submitCustomerBtn); addButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { String sCustomerName = customerName.getText().toString(); String sCustomerAddress = customerAddress.getText().toString(); if(sCustomerName.trim().length() > 0 && sCustomerAddress.trim().length() > 0) { Customer customer = new Customer(); customer.setName(sCustomerName); customer.setAddress(sCustomerAddress); customer.setLocation("Not set"); customer.setImage("None"); customer = dataSource.createCustomer(customer); if(customer.getId() != 0) { Toast.makeText(getActivity(), customer.getName() + " with id: " + customer.getId() + " was created!", Toast.LENGTH_LONG).show(); Log.i(LOGTAG, "Customer created with id " + customer.getId()); } }else{ Toast.makeText(getActivity(), "Please fill all fields.", Toast.LENGTH_LONG).show(); } } }); return rootView;Inside my dataSource class where i controle my DB query and statement im calling the createCustomer method, which looks like this:
public Customer createCustomer(Customer customer) { ContentValues values = new ContentValues(); values.put(BusinessDBOpenHelper.CUSTOMER_NAME, customer.getName()); values.put(BusinessDBOpenHelper.CUSTOMER_ADDRESS, customer.getAddress()); values.put(BusinessDBOpenHelper.CUSTOMER_LOCATION, customer.getLocation()); values.put(BusinessDBOpenHelper.CUSTOMER_IMAGE, customer.getImage()); long insertid = database.insert(BusinessDBOpenHelper.TABLE_CUSTOMER, null, values); customer.setId(insertid); return customer; }My Customer model is also just containg long id, String name, String address, String location, String image with getters and setters.. The null exception is:
java.lang.NullPointerException: Attempt to invoke virtual method 'org.example.app.model.Customer org.example.app.db.BusinessDataSource.createCustomer(org.example.app.model.Customer)' on a null object reference at org.example.app.AddCustomerFragment$1.onClick(Fragment.java:55)解决方案
Your
dataSource.createCustomer(customer);is null, you have to initialize
dataSourcesomewhere
更多推荐
在插入对象的SQLite数据库空例外
发布评论