在gradle中添加dataBinding，开启数据绑定。

android {    compileSdkVersion 29    buildToolsVersion "29.0.3"    defaultConfig {        applicationId "com.moyu.databinding"        minSdkVersion 28        targetSdkVersion 29        versionCode 1        versionName "1.0"        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"        dataBinding {            enabled true        }    }

public class MainActivity extends AppCompatActivity {    MyViewModel myViewModel;    ActivityMainBinding binding;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        setContentView(R.layout.activity_main);        binding = DataBindingUtil.setContentView(this,R.layout.activity_main);        myViewModel =  new ViewModelProvider(this).get(MyViewModel.class);        myViewModel.getNumber().observe(this, new Observer<Integer>() {            @Override            public void onChanged(Integer integer) {                binding.textView.setText(String.valueOf(integer));            }        });        binding.button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                myViewModel.add();            }        });    }}

使用数据绑定

ActivityMainBinding binding;

 binding = DataBindingUtil.setContentView(this,R.layout.activity_main);

取代了

setContentView(R.layout.activity_main);

android:onClick="@{()->data.add()}"

取代了

//        binding.button.setOnClickListener(new View.OnClickListener() {//            @Override//            public void onClick(View v) {//                myViewModel.add();//            }//        });

binding.setData(myViewModel);binding.setLifecycleOwner(this);

取代了

//观察者//        myViewModel.getNumber().observe(this, new Observer() {//            @Override//            public void onChanged(Integer integer) {//                binding.textView.setText(String.valueOf(integer));//            }//        });

DataBinding

使用数据绑定

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