效果圖
所需依賴
依賴較多
implementation ‘com.jakewharton:butterknife:10.2.1’//Butterknife配置
annotationProcessor ‘com.jakewharton:butterknife-compiler:10.2.1’//Butterknife註解處理器
implementation ‘com.github.bumptech.glide:glide:4.10.0’//圖片加載框架
implementation 'androidx.recyclerview:recyclerview:1.1.0'//recycerview
implementation 'org.greenrobot:eventbus:3.1.1' //eventbus 事件總線，傳值
//retrofit核心庫
implementation 'com.squareup.retrofit2:retrofit:2.6.2'
//retrofit輔助，gson解析的庫
implementation 'com.squareup.retrofit2:converter-gson:2.6.2'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.6.2' // 必要依賴，和Rxjava結合必須用到，下面會提到
implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'//切換到主線程的依賴
//okhttp日誌攔截器
implementation 'com.squareup.okhttp3:logging-interceptor:4.2.2'
首先先創建左右側的Entity
創建ApiService接口
public interface ApiService {
@GET(“左側尾部地址”)
Observable < LeftEntity > getResult();
//Observable導io包，左側Entity的名稱及獲取的集合名稱
@GET(“右側尾部地址”)
Observable< RightEntity > getRight(@QueryMap HashMap<String,String> params);
//右側Entity的名稱及獲取的集合名稱（獲取map，創建Hasmap）
}
創建RetrofitUtils工具類
public class RetroitUtils {
private static RetroitUtils retroit;
private final Retrofit retrofit;
public RetroitUtils() {
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
.build();
retrofit = new Retrofit.Builder()
.baseUrl("左右側前段相同地址")
.client(okHttpClient)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build();
}
public static RetroitUtils getInstance() {
if (retroit==null){
synchronized (RetroitUtils.class){
if (retroit==null){
retroit=new RetroitUtils();
}
}
}
return retroit;
}
public <T>T createservice(Class<T> tClass){
T t = retrofit.create(tClass);
return t;
}
}
創建MVP的conntract契約接口
public interface INewsConntract {
interface IModel extends BaseModel{
interface ModelCallBack{
void success(Object obj);
void failure(Throwable throwable);
}
void getLeft(ModelCallBack modelCallBack);
void getRight(HashMap<String,String> params,ModelCallBack modelCallBack);
}
interface IView{
void success(Object obj);
void failure(Throwable throwable);
}
interface IPresenter{
void getLeft();
void getRight(HashMap<String,String> params);
}
}
創建MVP的M層
需要繼承契約類對應的接口
public class Model implements INewsConntract.IModel {
@Override
public void getLeft(ModelCallBack modelCallBack) {
RetroitUtils.getInstance().createservice(ApiService.class)//創建服務
.getResult()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<LeftEntity>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(LeftEntity leftEntity) {
modelCallBack.success(leftEntity);
}
@Override
public void onError(Throwable e) {
modelCallBack.failure(e);
}
@Override
public void onComplete() {
}
});
}
@Override
public void getRight(HashMap<String, String> params, ModelCallBack modelCallBack) {
RetroitUtils.getInstance().createservice(ApiService.class)
.getRight(params)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<RightEntity>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(RightEntity rightEntity) {
modelCallBack.success(rightEntity);
}
@Override
public void onError(Throwable e) {
modelCallBack.failure(e);
}
@Override
public void onComplete() {
}
});
}
}
創建MVP的P層
需要繼承契約類對應的接口
public class Presenter implements INewsConntract.IPresenter {
private INewsConntract.IView iView;
private Model model;
public Presenter(INewsConntract.IView iView) {
this.iView = iView;
this.model = new Model();
}
@Override
public void getLeft() {
model.getLeft(new INewsConntract.IModel.ModelCallBack() {
@Override
public void success(Object obj) {
iView.success(obj);
}
@Override
public void failure(Throwable throwable) {
iView.failure(throwable);
}
});
}
@Override
public void getRight(HashMap<String, String> params) {
model.getRight(params, new INewsConntract.IModel.ModelCallBack() {
@Override
public void success(Object obj) {
iView.success(obj);
}
@Override
public void failure(Throwable throwable) {
iView.failure(throwable);
}
});
}
}
顯示界面xml設置
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_left"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_right"
android:layout_width="0dp"
android:layout_weight="3"
android:layout_height="match_parent"/>
顯示層的Activity
#### 需要繼承契約類對應的view層接口，這裏用到了ButterKnife及EventBus
public class MainActivity extends AppCompatActivity implements INewsConntract.IView {
@BindView(R.id.rv_left)
RecyclerView rvLeft;
@BindView(R.id.rv_right)
RecyclerView rvRight;
private Presenter presenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
presenter = new Presenter(this);
ButterKnife.bind(this);
EventBus.getDefault().register(this);
rvLeft.setLayoutManager(new LinearLayoutManager(this));
rvRight.setLayoutManager(new GridLayoutManager(this,2));
if (RetroitUtils.getInstance().isNet()){
presenter.getLeft();
}
}
@Override
public void success(Object obj) {
if (obj instanceof LeftEntity){
List<LeftEntity.ResultBean.SecondCategoryVoBean> secondCategoryVo = ((LeftEntity) obj).getResult().get(0).getSecondCategoryVo();
LeftAdapter leftAdapter = new LeftAdapter(this, secondCategoryVo);
rvLeft.setAdapter(leftAdapter);
leftAdapter.setLeftClick(new LeftAdapter.LeftClick() {
@Override
public void leftItemClick(String id) {
EventBus.getDefault().post(id);
}
});
}else if (obj instanceof RightEntity){
List<RightEntity.Right> result = ((RightEntity) obj).result;
RightAdapter rightAdapter = new RightAdapter(this,result);
rvRight.setAdapter(rightAdapter);
}
}
@Override
public void failure(Throwable throwable) {
}
@Subscribe(threadMode = ThreadMode.MAIN)
public void getId(String id){
HashMap<String, String> params = new HashMap<>();
params.put("categoryId",id);
params.put("page","1");
params.put("count","10");
presenter.getRight(params);
}
}
左側的適配器配置
public class LeftAdapter extends RecyclerView.Adapter<LeftAdapter.MyViewHolder> {
private final Context context;
private final List<LeftEntity.ResultBean.SecondCategoryVoBean> secondCategoryVo;
public LeftAdapter(Context context, List<LeftEntity.ResultBean.SecondCategoryVoBean> secondCategoryVo) {
this.context = context;
this.secondCategoryVo = secondCategoryVo;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View inflate = View.inflate(context, R.layout.item, null);
MyViewHolder myViewHolder = new MyViewHolder(inflate);
return myViewHolder;
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
holder.tv.setText(secondCategoryVo.get(position).getName());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
leftClick.leftItemClick(secondCategoryVo.get(position).getId());
}
});
}
@Override
public int getItemCount() {
return secondCategoryVo.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tv)
TextView tv;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
private LeftClick leftClick;
public void setLeftClick(LeftClick leftClick) {
this.leftClick = leftClick;
}
public interface LeftClick{
void leftItemClick(String id);
}
}
右側的適配器配置
public class RightAdapter extends RecyclerView.Adapter<RightAdapter.MyViewHolder> {
private final Context context;
private final List<RightEntity.Right> result;
public RightAdapter(Context context, List<RightEntity.Right> result) {
this.context = context;
this.result = result;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = View.inflate(context, R.layout.right_item, null);
MyViewHolder myViewHolder = new MyViewHolder(view);
return myViewHolder;
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
holder.tv.setText(result.get(position).commodityName);
Glide.with(context).load(result.get(position).masterPic)
.placeholder(R.mipmap.ic_launcher)
.error(R.mipmap.ic_launcher)
.into(holder.iv);
}
@Override
public int getItemCount() {
return result.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.iv)
ImageView iv;
@BindView(R.id.tv)
TextView tv;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this,itemView);
}
}
}