Android(安卓)数据绑定视图 dataBinding

1,在build.gradle中,添加一下代码

android {    ...    dataBinding {        enabled = true    }}

2.在布局文件activity_main.xml中添加一下代码,或者直接点击小灯泡 ,

myViewMdel是绑定的模型

<?xml version="1.0" encoding="utf-8"?>                            ........

3,viewModel来创建liveData模型

package com.example.binddata;import androidx.lifecycle.MutableLiveData;import androidx.lifecycle.ViewModel;public class MyViewModel extends ViewModel {    //定义绑定变量    private MutableLiveData number;    //获取变量方法    public MutableLiveData getNumber() {        if(number == null){            number = new MutableLiveData<>();            number.setValue(0);        }        return number;    }    //增加    public void add(int n){        number.setValue(number.getValue()+n);    }}

4,如果已经在activity_main.xml中添加了上述代码,则MainActivity.java中,就可以直接使用一下类

MyViewModel myViewModel;    ActivityMainBinding binding;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        binding = DataBindingUtil.setContentView(this,R.layout.activity_main);        myViewModel = ViewModelProviders.of(this).get(MyViewModel.class);        binding.setData(myViewModel);        binding.setLifecycleOwner(this);    }

5,在xml中,直接绑定

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