[英]Getting java.lang.ClassCastException: android.widget.SimpleAdapter cannot be cast
I am creating listView using SimpleAdapter but while clicking on items I am getting class cast exception.In onItemClick method I am trying to get reference of my Customer class at that point only getting class cast exception which I can see in Android monitor log. 我正在使用SimpleAdapter创建listView,但是在单击项目时正在获取类强制转换异常。在onItemClick方法中,我试图在那时获取我的Customer类的引用,但只能获取我可以在Android监视器日志中看到的类强制转换异常。
MainActivity.java MainActivity.java
public class MainActivity extends AppCompatActivity {
private ListView listView;
ArrayList<HashMap<String, String>> data;
SimpleAdapter adapter;
Customer customer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
data=new ArrayList<>();
data.add(new Customer("Cusomer Name1", "customer1 Name").toHasMap());
data.add(new Customer("Cusomer Name2", "customer2 Name").toHasMap());
String[] hasMapProperties={"FirstName", "LastName"};
int[] texfields={R.id.list_item_customer2_firstname,R.id.list_item_customer2_secndname};
adapter=new SimpleAdapter(this,data,R.layout.list_item_customer_2,hasMapProperties,texfields);
listView=(ListView)findViewById(R.id.main_activity_listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
TextView textView= (TextView) view.findViewById(R.id.list_item_customer2_firstname);
Customer customer= (Customer) adapter.getItem(position);
Toast.makeText(MainActivity.this,"Clicked " + customer.getFirstname() + " Postion " + position,Toast.LENGTH_SHORT).show();
}
});
}
Customer 顾客
public class Customer {
private final String firstname;
private final String lastname;
public Customer(String firstname, String lastname) {
this.firstname = firstname;
this.lastname = lastname;
}
public String getFirstname() {
return firstname;
}
public String getLastname() {
return lastname;
}
@Override
public String toString() {
return getFirstname() + "" + getLastname();
}
public HashMap<String,String> toHasMap() {
HashMap<String, String> returnValue=new HashMap<>();
returnValue.put("FirstName",getFirstname());
returnValue.put("LastName",getLastname());
return returnValue;
}
}
I am beginner in android development 我是android开发的初学者
That is because your adapter.getItem
returns a HashMap. 那是因为您的adapter.getItem
返回一个HashMap。 Change you code like this: 像这样更改您的代码:
Map<String,String> customer= (HashMap<String, String>) adapter.getItem(position); // CHANGE CUSTOMER TYPE TO MAP
Toast.makeText(MainActivity.this,"Clicked " + customer.get("FirstName") + " Postion " + position,Toast.LENGTH_SHORT).show();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.