MVVM-Day3

Base层框架同Day2创建FoodEntity、Api接口、RetrifitManager管理类

Api接口:

package com.bw.day3.MVVM.Base.Http;

import com.bw.day3.MVVM.Base.Entity.FoodEntity;
import com.bw.day3.MVVM.Base.Entity.UserEntity;

import io.reactivex.Observable;
import okhttp3.RequestBody;
import retrofit2.http.Body;
import retrofit2.http.GET;
import retrofit2.http.POST;
import retrofit2.http.Query;

public interface Api {

    @GET("foods/getFoods")
    Observable<FoodEntity> getFoodData(@Query("currentPage") int currentPage, @Query("pageSize")int pageSize);

    @POST("user/register")
    Observable<UserEntity> postRegisterData(@Body RequestBody body);

    @POST("user/loginjson")
    Observable<UserEntity> postLoginData(@Body RequestBody body);
}

在Model创建BaseModel

package com.bw.day3.MVVM.Base.Model;

import com.bw.day3.MVVM.Base.Http.Api;
import com.bw.day3.MVVM.Base.Http.RetrifitManager;

public class BaseModel {

    protected Api api;

    public BaseModel() {
        api= RetrifitManager.getInstance().creatrRetrofit().create(Api.class);
    }

}

在ViewModel包中创建BaseViewModel:

package com.bw.day3.MVVM.Base.ViewModel;

import androidx.lifecycle.ViewModel;

import com.bw.day3.MVVM.Base.Model.BaseModel;

public abstract class BaseViewModel <BaMo extends BaseModel>extends ViewModel {

    protected BaMo bModel;

    public BaseViewModel() {
        bModel=creatModel();
    }

    protected abstract BaMo creatModel();

}

创建BaseActivity:

package com.bw.day3.MVVM.Base.View;

import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.databinding.ViewDataBinding;
import androidx.lifecycle.ViewModelProvider;

import com.bw.day3.MVVM.Base.ViewModel.BaseViewModel;

public abstract class BaseActivity <VDB extends ViewDataBinding ,VM extends BaseViewModel>extends AppCompatActivity {

    protected VDB viewDataBinding;
    protected VM viewModel;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        viewDataBinding= DataBindingUtil.setContentView(this, getLayoutid());
        viewModel=new ViewModelProvider(this).get(getViewModel());
        initView();
        initData();
        handObserver();
    }

    protected abstract Class<VM> getViewModel();

    protected abstract int getLayoutid();

    protected abstract void initView();

    protected abstract void initData();

    protected void handObserver() {

    }

}

Food应用层创建Food包:

创建FoodModel继承BaseModel:

package com.bw.day3.MVVM.Food;

import com.bw.day3.MVVM.Base.Entity.FoodEntity;
import com.bw.day3.MVVM.Base.Model.BaseModel;

import io.reactivex.Observable;

public class FoodModel extends BaseModel {

    public Observable<FoodEntity> getFoodData(int currentPage,int pageSize){
        return api.getFoodData(currentPage,pageSize);
    }

}

创建FoodViewModel继承BaseViewModel泛型为FoodModel:

package com.bw.day3.MVVM.Food;

import android.util.Log;

import androidx.lifecycle.MutableLiveData;

import com.bw.day3.MVVM.Base.Entity.FoodEntity;
import com.bw.day3.MVVM.Base.ViewModel.BaseViewModel;

import io.reactivex.Observer;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.Disposable;
import io.reactivex.schedulers.Schedulers;

public class FoodViewModel extends BaseViewModel<FoodModel> {

    public MutableLiveData<FoodEntity> liveData=new MutableLiveData<>();

    @Override
    protected FoodModel creatModel() {
        return new FoodModel();
    }

    public void getFood(int page,int size){
        bModel.getFoodData(page,size)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<FoodEntity>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(FoodEntity foodEntity) {
                        Log.i("TAG", "onNext: "+foodEntity.getData().size());
                        liveData.postValue(foodEntity);
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }
}

创建FoodActivity继承BaseActivity泛型为ActivityFoodBinding,FoodViewModel：

package com.bw.day3.MVVM.Food;

import androidx.recyclerview.widget.LinearLayoutManager;

import com.bw.day3.MVVM.Base.Adapter.FoodAdapter;
import com.bw.day3.MVVM.Base.Entity.FoodEntity;
import com.bw.day3.MVVM.Base.View.BaseActivity;
import com.bw.day3.R;
import com.bw.day3.databinding.ActivityFoodBinding;

import java.util.ArrayList;
import java.util.List;

public class FoodActivity extends BaseActivity<ActivityFoodBinding,FoodViewModel> {


    protected List<FoodEntity.DataBean> list=new ArrayList<>();
    protected FoodAdapter adapter;

    @Override
    protected Class<FoodViewModel> getViewModel() {
        return FoodViewModel.class;
    }

    @Override
    protected int getLayoutid() {
        return R.layout.activity_food;
    }

    @Override
    protected void initView() {
        viewModel.getFood(1,10);
    }

    @Override
    protected void initData() {
        viewDataBinding.rv.setLayoutManager(new LinearLayoutManager(FoodActivity.this));
        viewDataBinding.rv.setAdapter(adapter);;
    }

    @Override
    protected void handObserver() {
        super.handObserver();
        viewModel.liveData.observe(this, foodEntity -> {
            if (foodEntity.getCode()==200){
                list.addAll(foodEntity.getData());
                adapter=new FoodAdapter(R.layout.view_food,list);
                viewDataBinding.rv.setAdapter(adapter);
            }
        });
    }
}

登录注册

先写Model应用层的Model继承BaseModel（方法可从Api中复制）:

package com.bw.day3.MVVM.User.Login;

import com.bw.day3.MVVM.Base.Entity.UserEntity;
import com.bw.day3.MVVM.Base.Model.BaseModel;

import io.reactivex.Observable;
import okhttp3.RequestBody;

public class LoginModel extends BaseModel {
    public Observable<UserEntity> postLoginData(RequestBody body){
        return api.postLoginData(body);
    }
}

再写ViewModel(继承BaseViewModel泛型为应用层的Model):

package com.bw.day3.MVVM.User.Login;

import androidx.lifecycle.MutableLiveData;

import com.bw.day3.MVVM.Base.Entity.UserEntity;
import com.bw.day3.MVVM.Base.ViewModel.BaseViewModel;

import io.reactivex.Observer;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.Disposable;
import io.reactivex.schedulers.Schedulers;
import okhttp3.RequestBody;

public class LoginViewModel extends BaseViewModel<LoginModel> {

    public MutableLiveData<UserEntity> liveData=new MutableLiveData<>();

    @Override
    protected LoginModel creatModel() {
        return new LoginModel();
    }

    public void postLoginData(RequestBody body){
        bModel.postLoginData(body)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<UserEntity>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(UserEntity userEntity) {
                        liveData.postValue(userEntity);
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }
}

最后写View层Activity

package com.bw.day3.MVVM.User.Login;


import android.content.Intent;
import android.widget.Toast;

import com.bw.day3.MVVM.Base.View.BaseActivity;
import com.bw.day3.MVVM.User.Register.RegisterActivity;
import com.bw.day3.R;
import com.bw.day3.databinding.ActivityLoginBinding;
import com.google.gson.Gson;

import java.util.HashMap;
import java.util.Map;

import okhttp3.MediaType;
import okhttp3.RequestBody;

public class LoginActivity extends BaseActivity<ActivityLoginBinding,LoginViewModel> {


    @Override
    protected Class<LoginViewModel> getViewModel() {
        return LoginViewModel.class;
    }

    @Override
    protected int getLayoutid() {
        return R.layout.activity_login;
    }

    @Override
    protected void initView() {
        viewDataBinding.login.setOnClickListener(v -> {
            String username=viewDataBinding.username.getText().toString().trim();
            String password=viewDataBinding.password.getText().toString().trim();
            Map<String,String> map=new HashMap<>();
            map.put("username",username);
            map.put("password",password);
            String json=new Gson().toJson(map);
            RequestBody requestBody=RequestBody.create(MediaType.parse("application/json;charset=utf-8"),json);
            viewModel.postLoginData(requestBody);
        });
        viewDataBinding.register.setOnClickListener(v -> {
            Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
            startActivity(intent);
        });
    }

    @Override
    protected void initData() {

    }

    @Override
    protected void handObserver() {
        super.handObserver();
        viewModel.liveData.observe(this, userEntity -> {
            if (userEntity.getCode()==200){
                Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
            }else {
                Toast.makeText(this, "登录失败:"+userEntity.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }
}

所需依赖build.gradle中添加:

 viewBinding {
        enabled = true
    }
    dataBinding {
        enabled = true
    }

implementation 'com.google.code.gson:gson:2.8.0'//gson依赖
    //RxJava依赖:主要用于消息传递
    implementation 'io.reactivex.rxjava2:rxjava:2.2.8'
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'
    //Retrofit依赖
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    //Gson converter gson解析
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
    //RxJava2 Adapter
    implementation "com.squareup.retrofit2:adapter-rxjava2:2.3.0"
    //okhttp
    implementation 'com.squareup.okhttp3:okhttp:3.4.1'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.9.1'

//rxlifecycle异步线程生命周期管理
    implementation 'com.trello.rxlifecycle2:rxlifecycle-components:2.2.1'

    //rxpermissions
    implementation 'com.github.tbruyelle:rxpermissions:0.10.2'
    implementation 'com.github.bumptech.glide:glide:4.11.0'
    implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.0'//万能适配器
    implementation 'com.android.support:recyclerview-v7:30.0.0'//recyclerview