Android dataBinding和viewBinding简单封装Activity

public abstract class BaseActivity<MD extends BaseViewModel> extends AppCompatActivity implements View.OnClickListener {

    protected Context context;

    protected MD viewModel;

    protected Application app;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initBindingView();
        context = this;
        if (initViewModel() != null){
            viewModel = (MD) new ViewModelProvider(this).get(initViewModel().getClass());
            viewModel.application = app;
            getLifecycle().addObserver(viewModel);
        }
        initView();
        initData();
        initListener();

        ActivityListUtil.getInstance().addActivityToList(this);
    }

    @Override
    protected void onDestroy() {
        if (initViewModel() != null){
            getLifecycle().removeObserver(viewModel);
        }
        ActivityListUtil.getInstance().removeActivityFromList(this);
        super.onDestroy();
    }

    protected void initBindingView() {}

    protected void initOnClick(View... views){
        for (View view: views) {
            view.setOnClickListener(this);
        }
    }

    protected abstract MD initViewModel();

    protected abstract void initView();

    protected abstract void initData();

    protected abstract void initListener();

    protected void startActivity(Class<?> cls) {
        startActivity(cls, null);
    }

    protected void startActivity(Class<?> cls, Bundle bundle) {
        Intent intent = new Intent(context, cls);
        if (bundle != null) {
            intent.putExtras(bundle);
        }
        startActivity(intent);
    }

}

---

dataBinding：

public abstract class BaseDataBindingActivity<DB extends ViewDataBinding, MD extends BaseViewModel> extends BaseActivity<MD> {

    protected DB binding;

    @Override
    protected void initBindingView() {
        super.initBindingView();
        binding = DataBindingUtil.setContentView(this, getLayoutId());
        binding.setLifecycleOwner(this);
    }

    @Override
    protected void onDestroy() {
        if (binding != null){
            binding.unbind();
            binding = null;
        }
        super.onDestroy();
    }

    protected abstract int getLayoutId();

}

使用：

public class MainActivity extends BaseDataBindingActivity<ActivityMain3Binding, BaseViewModel> {

    @Override
    protected int getLayoutId() {
        return R.layout.activity_main3;
    }

    @Override
    protected BaseViewModel initViewModel() {
        return null;
    }

    @Override
    protected void initView() {
        initOnClick(binding.dAxt);
    }

    @Override
    protected void initData() {

    }

    @Override
    protected void initListener() {
//        viewModel.getUsers().observe(this, users -> {
//            Log.e("---------->", "---------");
//        });
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.dAxt:
//                viewModel.getData();
                Toast.makeText(context, "123", Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

---

viewBinding：

public abstract class BaseViewBindingActivity<VB extends ViewBinding, MD extends BaseViewModel> extends BaseActivity<MD> {

    protected VB binding;

    @Override
    protected void initBindingView() {
        super.initBindingView();

        binding = getViewBinding(getLayoutInflater());
        setContentView(binding.getRoot());
    }

    @Override
    protected void onDestroy() {
        binding = null;
        super.onDestroy();
    }

    protected abstract VB getViewBinding(LayoutInflater layoutInflater);

}

使用：

public class ViewActivity extends BaseViewBindingActivity<ActivityViewBinding, BaseViewModel> {

    @Override
    protected ActivityViewBinding getViewBinding(LayoutInflater layoutInflater) {
        return ActivityViewBinding.inflate(layoutInflater);
    }

    @Override
    protected BaseViewModel initViewModel() {
        return null;
    }

    @Override
    protected void initView() {

    }

    @Override
    protected void initData() {
    }

    @Override
    protected void initListener() {

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
        }
    }
}

---

管理Activity：

public class ActivityListUtil {

    private static ActivityListUtil instance;
    public ArrayList<Activity> activityList;

    public ActivityListUtil() {
        activityList = new ArrayList<>();
    }

    public static ActivityListUtil getInstance() {
        if (instance == null) {
            instance = new ActivityListUtil();
        }
        return instance;
    }

    public void addActivityToList(Activity activity) {
        if (activity != null) {
            activityList.add(activity);
        }
    }

    public void removeActivityFromList(Activity activity) {
        if (activityList != null && activityList.size() > 0) {
            activityList.remove(activity);
        }
    }

    public void cleanActivityList() {
        if (activityList != null && activityList.size() > 0) {
            for (int i = 0; i < activityList.size(); i++) {
                Activity activity = activityList.get(i);
                if (activity != null && !activity.isFinishing()) {
                    activity.finish();
                }
            }
        }
    }
}