Databinding在各种场景下拿到binding对象

1、MyDataBindingActivity

ps:拿到binding的方式如下

activityMyDataBindingBinding = DataBindingUtil.setContentView(this, R.layout.activity_my_data_binding);

---

public class MyDataBindingActivity extends BaseActivity {    private MyDataBindingViewModel vModel;    private ActivityMyDataBindingBinding activityMyDataBindingBinding;    private MyDataBindingAdapter adapter;    private List<String> list = new ArrayList<>();    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        activityMyDataBindingBinding = DataBindingUtil.setContentView(this, R.layout.activity_my_data_binding);        super.onCreate(savedInstanceState);//布局文件中必须有data标签，data标签里可以毛都没有,所以下面两行不需要的时候可以不写        //vModel = new MyDataBindingViewModel(this);        //activityMyDataBindingBinding.setVmodel(vModel);        initView();        registerListner();        initData();    }    private void initData() {        for (int i = 0; i < 30; i++) {            list.add("test databinding" + i);        }        adapter.notifyDataSetChanged();    }    private void registerListner() {    }    private void initView() {        activityMyDataBindingBinding.activityMyDataRv.setLayoutManager(new LinearLayoutManager(this));        adapter = new MyDataBindingAdapter(this, list);        activityMyDataBindingBinding.activityMyDataRv.setAdapter(adapter);    }}

布局activity_my_data_binding

ps:layout标签下不要有宽高等属性，data标签必须有，但是内部可以毛都没有

<?xml version="1.0" encoding="utf-8"?><layout xmlns:android="http://schemas.android.com/apk/res/android">    <data>    </data>    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="match_parent">        <android.support.v7.widget.RecyclerView            android:id="@+id/activity_my_data_rv"            android:layout_width="match_parent"            android:layout_height="match_parent">        </android.support.v7.widget.RecyclerView>    </RelativeLayout></layout>

2、MyDataBindingAdapter

ps:拿到binding的方式如下

ItemMyDataBinding binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.item_my_data, parent, false);

---

public class MyDataBindingAdapter extends RecyclerView.Adapter<MyDataBindingAdapter.MyViewHolder> {    private Context mContext;    private List<String> mList = new ArrayList<>();    public MyDataBindingAdapter(Context context, List<String> list) {        mContext = context;        mList = list;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        ItemMyDataBinding binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.item_my_data, parent, false);        return new MyViewHolder(binding);    }    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        holder.bindData(mList.get(position));    }    @Override    public int getItemCount() {        return mList.size();    }    public static class MyViewHolder extends RecyclerView.ViewHolder {        private ItemMyDataBinding binding;        public MyViewHolder(ItemMyDataBinding binding) {            super(binding.getRoot());            this.binding = binding;        }        public ItemMyDataBinding getBinding() {            return binding;        }        public void bindData(String s) {         //可以直接使用binding拿到view来操作         binding.itemMyDataTvName.setText(s);  //也可以使用databinding的优势特征，view随data变化,如下两行         //binding.setVariable(BR.vmoduels, model);         //binding.executePendingBindings();        }    }}

布局item_my_data

<?xml version="1.0" encoding="utf-8"?><layout xmlns:android="http://schemas.android.com/apk/res/android">    <data>    </data>    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center">        <TextView            android:id="@+id/item_my_data_tv_name"            android:layout_width="match_parent"            android:layout_height="40dp"            android:gravity="center"            android:textColor="#ce0000"            android:textSize="15sp" />    </RelativeLayout></layout>

3、自定义view中拿到databinding对象

public class HomeCommunityFocusHeaderview extends FrameLayout {    private Context mContext;    private HeaderviewHomepageFocusBinding binding;    private List<String> mList = new ArrayList<>();    public HomeCommunityFocusHeaderview(@NonNull Context context) {        this(context, null);    }    public HomeCommunityFocusHeaderview(@NonNull Context context, @Nullable AttributeSet attrs) {        this(context, attrs, 0);    }    public HomeCommunityFocusHeaderview(@NonNull Context context, @Nullable AttributeSet attrs, @AttrRes int defStyleAttr) {        super(context, attrs, defStyleAttr);        mContext = context;        View mainView = LayoutInflater.from(context).inflate(R.layout.headerview_homepage_focus, null);        //就是下面这句        binding = DataBindingUtil.bind(mainView);        initView();        registerLitener();        initData();        addView(mainView);    } }

---

参考：
http://www.jishux.com/plus/view-628623-1.html
http://blog.csdn.net/bin622/article/details/72870328
http://blog.csdn.net/l631768226/article/details/53692330