[移动开发]DataBinding 结合 RecyclerView

启用 DataBinding

app build.gradle 配置启用?DataBinding

android {
    ...
    buildFeatures {
        dataBinding = true
    }
    ...
}

主布局

?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>     
</LinearLayout>

item 布局

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="obSwordsman"
            type="com.imooc.book.papger11.ObSwordsman" />
    </data>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <TextView
            android:layout_width="wrap_content"
            android:text="@{obSwordsman.name}"
            android:layout_height="wrap_content"/>
        <TextView
            android:layout_width="wrap_content"
            android:text="@{obSwordsman.age}"
            android:layout_height="wrap_content"/>
    </LinearLayout>
</layout>

Model 实体类

public class ObSwordsman {
    public ObservableField<String>  name = new ObservableField();
    public ObservableField<String>  age = new ObservableField();

    public ObSwordsman(String name, String age) {
        this.name.set(name);
        this.age.set(age);
    }

    public ObservableField<String> getName() {
        return name;
    }

    public void setName(ObservableField<String> name) {
        this.name = name;
    }

    public ObservableField<String> getAge() {
        return age;
    }

    public void setAge(ObservableField<String> age) {
        this.age = age;
    }
}

Adapter

public class BindingAdapter extends RecyclerView.Adapter<BindingAdapter.BindingViewHolder> {
    private List<ObSwordsman> datas;
    public BindingAdapter(List<ObSwordsman> datas) {
        this.datas = datas;
    }
    @NonNull
    @Override
    public BindingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        ItemSwordsmanBinding itemBinding =
                DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.item_swordsman,
                        parent,false);
        return new BindingViewHolder(itemBinding);
    }
    @Override
    public void onBindViewHolder(@NonNull BindingViewHolder holder, int position) {
        holder.getBinding().setObSwordsman(datas.get(position));
    }
    @Override
    public int getItemCount() {
        return datas.size();
    }
    public class BindingViewHolder extends RecyclerView.ViewHolder{
        private ItemSwordsmanBinding binding;
        public BindingViewHolder(ItemSwordsmanBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }
        public ItemSwordsmanBinding getBinding() {
            return binding;
        }
    }
}

基本使用

public class DataBindingActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_databinding);

        RecyclerView recyclerView = findViewById(R.id.recycler);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        BindingAdapter adapter = new BindingAdapter(getData());
        recyclerView.setAdapter(adapter);
    }

    private List<ObSwordsman> getData() {
        List<ObSwordsman> datas = new ArrayList<>();
        datas.add(new ObSwordsman("jake11","12"));
        datas.add(new ObSwordsman("jake12","13"));
        return datas;
    }
}