Android 活动没有';t显示回收视图-数据绑定
我尝试使用RecyclerView进行数据绑定,但我的主要活动没有显示对象的RecyclerView内容。我不知道失败的关键在哪里。 谢谢你的建议 这里是我的简单代码 类别:用户 类:UserAdapter 公共类UserAdapter扩展了RecyclerView.Adapter{ 私人活动主持人; 私有ArrayList项; 公共用户适配器(活动、ArrayList项){ this.host=活动; 这个项目=项目; Log.i(“UserAdapterName”,items.get(0.getName().toString());//日志显示Gordon } @凌驾 public UserAdapter.ItemViewHolder onCreateViewHolder(视图组父级,int-viewType){ //充气布局和检索绑定 ListItemsBinding binding=DataBindingUtil.inflate(host.getLayoutInflater(), R.layout.list_项,父项,false);; 返回新的ItemViewHolder(绑定); } @凌驾 BindViewHolder上的公共无效(RecyclerView.ViewHolder,int位置){ 用户项目=项目。获取(位置); ItemViewHolder ItemViewHolder=(ItemViewHolder)holder; itemViewHolder.bindItem(项目); } @凌驾 public int getItemCount(){ 返回items.size(); } 静态类ItemViewHolder扩展了RecyclerView.ViewHolder{ 列表项绑定; ItemViewHolder(ListItemsBinding绑定){ super(binding.getRoot()); 这个。绑定=绑定; } 无效绑定项(用户项){ binding.setUser(项); binding.executePendingBindings(); } } } 类别:主要活动Android 活动没有';t显示回收视图-数据绑定,android,data-binding,android-recyclerview,android-databinding,Android,Data Binding,Android Recyclerview,Android Databinding,我尝试使用RecyclerView进行数据绑定,但我的主要活动没有显示对象的RecyclerView内容。我不知道失败的关键在哪里。 谢谢你的建议 这里是我的简单代码 类别:用户 类:UserAdapter 公共类UserAdapter扩展了RecyclerView.Adapter{ 私人活动主持人; 私有ArrayList项; 公共用户适配器(活动、ArrayList项){ this.host=活动; 这个项目=项目; Log.i(“UserAdapterName”,items.get(0.g
public类MainActivity扩展了AppCompatActivity{
private ArrayList userList=new ArrayList();
私人活动主要约束;
专用用户适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
binding=DataBindingUtil.setContentView(this,R.layout.activity_main);
fillData();
adapter=newuseradapter(MainActivity.this,userList);
binding.recycler.setAdapter(适配器);
}
私有void fillData(){
添加(新用户(“Gordon”,26));
添加(新用户(“迪克”,34));
添加(新用户(“Ivan”,20));
}
}
布局:活动区
布局:列出项目
对我来说,您似乎忘记为RecyclerView设置正确的布局管理器 垂直列表缺少一行:
binding.recycler.setLayoutManager(new LinearLayoutManager(this));
public类MainActivity扩展了AppCompatActivity{
private ArrayList userList=new ArrayList();
私人活动主要约束;
专用用户适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fillData();
recycler=(RecyclerView)findViewById(R.id.recycler);
LinearLayoutManager=newlinearlayoutmanager(getActivity(),LinearLayoutManager.VERTICAL,false);
回收商。setLayoutManager(经理);
adapter=newuseradapter(MainActivity.this,userList);
回收器。设置适配器(适配器);
}
私有void fillData(){
添加(新用户(“Gordon”,26));
添加(新用户(“迪克”,34));
添加(新用户(“Ivan”,20));
}
}
公共类UserAdapter扩展了RecyclerView.Adapter{
私人活动主持人;
私有ArrayList项;
充气机;
公共用户适配器(活动、ArrayList项){
this.host=活动;
这个项目=项目;
Log.i(“UserAdapterName”,items.get(0.getName().toString());//日志显示Gordon
充气器=(LayoutFlater)context.getSystemService(context.LAYOUT\u充气器\u服务);
}
@凌驾
public UserAdapter.ItemViewHolder onCreateViewHolder(视图组父级,int-viewType){
//充气布局和检索绑定
视图=充气机。充气(R.layout.list\u项目,父项,false);
返回新的ItemViewHolder(视图);
}
@凌驾
BindViewHolder上的公共无效(RecyclerView.ViewHolder,int位置){
用户项目=项目。获取(位置);
ItemViewHolder ItemViewHolder=(ItemViewHolder)holder;
itemViewHolder.bindItem(项目);
}
@凌驾
public int getItemCount(){
返回items.size();
}
静态类ItemViewHolder扩展了RecyclerView.ViewHolder{
列表项绑定;
ItemViewHolder(ListItemsBinding绑定){
super(binding.getRoot());
这个。绑定=绑定;
}
无效绑定项(用户项){
binding.setUser(项);
binding.executePendingBindings();
}
}
}如果我添加这一行,应用程序在启动时崩溃,Android Studio会给我这个错误消息:E/AndroidRuntime:FATAL EXCEPTION:main Process:de.bp2go.recgo,PID:8328 android.content.res.Resources$NotFoundException:String resource ID#0x1a位于android.content.res.Resources.getText(Resources.java:1468)在…………您的下一个问题是android:text=“@{user.age}”age是int,所以android尝试将其用作资源。尝试包装它:android:text=“@{String.valueOf(user.age)}”Genius!acdsee,你救了我一天,非常感谢:)。
public class UserAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Activity host;
private ArrayList<User> items;
public UserAdapter(Activity activity, ArrayList<User> items) {
this.host = activity;
this.items = items;
Log.i("UserAdapterName", items.get(0).getName().toString()); //log shows Gordon
}
@Override
public UserAdapter.ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// inflate layout and retrieve binding
ListItemsBinding binding = DataBindingUtil.inflate(host.getLayoutInflater(),
R.layout.list_items, parent, false);;
return new ItemViewHolder(binding);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
User item = items.get(position);
ItemViewHolder itemViewHolder = (ItemViewHolder)holder;
itemViewHolder.bindItem(item);
}
@Override
public int getItemCount() {
return items.size();
}
static class ItemViewHolder extends RecyclerView.ViewHolder {
ListItemsBinding binding;
ItemViewHolder(ListItemsBinding binding) {
super(binding.getRoot());
this.binding = binding;
}
void bindItem(User item) {
binding.setUser(item);
binding.executePendingBindings();
}
}
}
public class MainActivity extends AppCompatActivity {
private ArrayList<User> userList = new ArrayList<User>();
private ActivityMainBinding binding;
private UserAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
fillData();
adapter = new UserAdapter(MainActivity.this,userList);
binding.recycler.setAdapter(adapter);
}
private void fillData() {
userList.add(new User("Gordon", 26));
userList.add(new User("Dick", 34));
userList.add(new User("Ivan",20));
}
}
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Activity Text"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="user"
type="de.bp2go.recgo.User" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{user.name}"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/black"
tools:text="Name" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{user.age}"
android:textColor="@android:color/black"
tools:text="Age" />
</LinearLayout>
</layout>
binding.recycler.setLayoutManager(new LinearLayoutManager(this));
public class MainActivity extends AppCompatActivity {
private ArrayList<User> userList = new ArrayList<User>();
private ActivityMainBinding binding;
private UserAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fillData();
recycler = (RecyclerView) findViewById(R.id.recycler);
LinearLayoutManager manager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
recycler.setLayoutManager(manager);
adapter = new UserAdapter(MainActivity.this,userList);
recycler.setAdapter(adapter);
}
private void fillData() {
userList.add(new User("Gordon", 26));
userList.add(new User("Dick", 34));
userList.add(new User("Ivan",20));
}
}
public class UserAdapter extends RecyclerView.Adapter<ItemViewHolder.ViewHolder> {
private Activity host;
private ArrayList<User> items;
LayoutInflater inflator;
public UserAdapter(Activity activity, ArrayList<User> items) {
this.host = activity;
this.items = items;
Log.i("UserAdapterName", items.get(0).getName().toString()); //log shows Gordon
inflator=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public UserAdapter.ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// inflate layout and retrieve binding
View view =inflator.inflate(R.layout.list_items, parent,false);
return new ItemViewHolder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
User item = items.get(position);
ItemViewHolder itemViewHolder = (ItemViewHolder)holder;
itemViewHolder.bindItem(item);
}
@Override
public int getItemCount() {
return items.size();
}
static class ItemViewHolder extends RecyclerView.ViewHolder {
ListItemsBinding binding;
ItemViewHolder(ListItemsBinding binding) {
super(binding.getRoot());
this.binding = binding;
}
void bindItem(User item) {
binding.setUser(item);
binding.executePendingBindings();
}
}