Android购物分类效果实现

本文实例为大家分享了Android购物分类效果展示的具体代码，供大家参考，具体内容如下

SecondActivity.java

public class SecondActivity extends AppCompatActivity{
  private ViewPager mPager;
  private RadioGroup mRadioGroup;

  @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second);

     mPager = findViewById(R.id.pager);
     mRadioGroup = findViewById(R.id.group);

     mPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int position) {
  Fragment fragment=null;

  switch (position){
    case 0:
      fragment = new Afrag();
      break;
    case 1:
      fragment = new Bfrag();
      break;
    case 2:
      fragment = new Cfrag();
      break;
  }
  return fragment;
}

@Override
public int getCount() {
  return 3;
}
     });

     mRadioGroup.setonCheckedChangeListener(new RadioGroup.onCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
  switch (i){
    case R.id.r1:
      mPager.setCurrentItem(0);
      break;
    case R.id.r2:
      mPager.setCurrentItem(1);
      break;
    case R.id.r3:
      mPager.setCurrentItem(2);
      break;
  }
}
     });
  }
}

secondActivity.xml

Afrag.java

public class Afrag extends Fragment{
  private RecyclerView mRecyclerView;
  public String urlString="http://www.wanandroid.com/tools/mockapi/6523/restaurants_offset_0_limit_4 ";

  @Nullable
  @Override
  public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = View.inflate(getActivity(), R.layout.afrag, null);
    mRecyclerView = view.findViewById(R.id.rv);
    initData();

    return view;
  }

  private void initData() {
    OkHttps okHttps = OkHttps.getInstance();

    okHttps.doGet(urlString, new OkHttps.OkCallback() {
      @Override
      public void onResponse(String json) { //瀑布流

 PubuBean pubuBean = new Gson().fromJson(json,PubuBean.class);
 List results = pubuBean.getData();

 PubuAdapter pubuAdapter = new PubuAdapter(getActivity());
 pubuAdapter.setDatas(results);
 mRecyclerView.setAdapter(pubuAdapter);

 StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
 mRecyclerView.setLayoutManager(manager);
      }

      @Override
      public void onFailure(Exception e) {

      }
    });

  }
}

afrag.xml

PubuAdapter.java

public class PubuAdapter extends RecyclerView.Adapter{
  private Context mContext;
  ArrayList list;

  public PubuAdapter(Context context) {
    mContext = context;
    list = new ArrayList<>();
  }

  public void setDatas(List datas) {
    list.addAll(datas);

  }
  @NonNull
  @Override
  public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = View.inflate(mContext, R.layout.pbitem, null);
    ViewHolder holder = new ViewHolder(view);
    return holder;
  }

  @Override
  public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

    holder.mTextView.setText(list.get(position).getName());
    Glide.with(mContext).load(list.get(position).getPic_url()).into(holder.mImageView);


  }

  @Override
  public int getItemCount() {
    return list.size();
  }



  public class ViewHolder extends RecyclerView.ViewHolder {
    ImageView mImageView;
    TextView mTextView;
    public ViewHolder(View itemView) {
      super(itemView);
      mImageView = itemView.findViewById(R.id.image);
      mTextView = itemView.findViewById(R.id.t1);

    }
  }
}

Bfrag.java

public class Bfrag extends Fragment{
  private RecyclerView mRecyclerView;
  LeftAdapter adapter;
  String urlString="http://www.zhaoapi.cn/product/getCatagory";
  String urlString2="http://www.zhaoapi.cn/product/getProductCatagory";
  private RecyclerView mRecyclerView2;

  @Nullable
  @Override
  public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = View.inflate(getActivity(), R.layout.bfrag, null);//分类页面

    mRecyclerView = view.findViewById(R.id.rv1); //左侧列表

    mRecyclerView2 = view.findViewById(R.id.rv2); //右
    initData();

    return view;
  }

  private void initData() {
    OkHttps okHttps = OkHttps.getInstance();

    okHttps.doGet(urlString, new OkHttps.OkCallback() {
      @Override
      public void onResponse(String json) { //瀑布流

 LeftBean leftBean = new Gson().fromJson(json,LeftBean.class);
 List results = leftBean.getData();

 adapter = new LeftAdapter(getActivity());
 adapter.setDatas(results);

 mRecyclerView.setAdapter(adapter);


 mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL,false));

 adapter.setonItemClickListener(new LeftAdapter.onItemClickListener() {
   @Override
   public void onItemClick(int position) {

     //Toast.makeText(getActivity(),position+"",Toast.LENGTH_SHORT).show();
     rigth(position);
   }
 });
      }

      @Override
      public void onFailure(Exception e) {

      }
    });
  }

  public void rigth(int position){
    HashMap map = new HashMap<>();
    map.put("cid",position+1+"");

    OkHttps.getInstance().doPost(urlString2,map,new OkHttps.OkCallback() {
      @Override
      public void onResponse(String json) {

 RightBean rightBean = new Gson().fromJson(json,RightBean.class);
 List results = rightBean.getData();

 RightAdapter rightAdapter = new RightAdapter(getActivity());
 rightAdapter.setDatas(results);

 mRecyclerView2.setAdapter(rightAdapter);

 mRecyclerView2.setLayoutManager(new GridLayoutManager(getActivity(),3));
      }

      @Override
      public void onFailure(Exception e) {

      }
    });
  }
}

bfrag.xml

LeftAdapter.java

public class LeftAdapter extends RecyclerView.Adapter{
  private Context mContext;
  ArrayList list;

  public LeftAdapter(Context context) {
    mContext = context;
    list = new ArrayList<>();
  }

  public void setDatas(List datas) {
    list.addAll(datas);

  }

  public interface OnItemClickListener{  //自定义接口回调设置点击事件
    void onItemClick(int position);
  }

  private onItemClickListener mOnItemClickListener;

  public void setonItemClickListener(onItemClickListener onItemClickListener){
    monItemClickListener=onItemClickListener;
  }

  @NonNull
  @Override
  public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = View.inflate(mContext, R.layout.leftitem, null);
    ViewHolder holder = new ViewHolder(view);
    return holder;
  }

  @Override
  public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {

    holder.mTextView.setText(list.get(position).getName());

    holder.itemView.setonClickListener(new View.onClickListener() {
      @Override
      public void onClick(View view) {
 int position1 = holder.getLayoutPosition();
 mOnItemClickListener.onItemClick(position1);
      }
    });
  }

  @Override
  public int getItemCount() {
    return list.size();
  }



  public class ViewHolder extends RecyclerView.ViewHolder {
    TextView mTextView;
    public ViewHolder(View itemView) {
      super(itemView);
      mTextView = itemView.findViewById(R.id.text1);

    }
  }
}

RightAdapter.java

public class RightAdapter extends RecyclerView.Adapter{
  private Context mContext;
  ArrayList list;

  public RightAdapter(Context context) {
    mContext = context;
    list = new ArrayList<>();
  }

  public void setDatas(List datas) {
    list.addAll(datas);

  }
  @NonNull
  @Override
  public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = View.inflate(mContext, R.layout.rightitem, null);
    ViewHolder holder = new ViewHolder(view);
    return holder;
  }

  @Override
  public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    holder.mTextView.setText(list.get(position).getName());
    Glide.with(mContext).load(list.get(position).getList().get(position).getIcon()).into(holder.mImageView);
  }

  @Override
  public int getItemCount() {
    return list.size();
  }



  public class ViewHolder extends RecyclerView.ViewHolder {
    ImageView mImageView;
    TextView mTextView;

    public ViewHolder(View itemView) {
      super(itemView);
      mImageView = itemView.findViewById(R.id.image1);
      mTextView = itemView.findViewById(R.id.text2);

    }
  }
}

OkHttps.java

public class OkHttps {
  Handler handler;
  private final OkHttpClient mOkHttpClient;
  private static OkHttps mOkHttps;

  private OkHttps() {
    handler = new Handler(Looper.getMainLooper());

    LoggingInterceptor loggingInterceptor = new LoggingInterceptor(); //日志拦截器
    mOkHttpClient = new OkHttpClient.Builder()
 .addInterceptor(loggingInterceptor)  //设置日志拦截器
 .connectTimeout(5000, TimeUnit.MILLISECONDS)
 .readTimeout(5000,TimeUnit.MILLISECONDS)
 .writeTimeout(5000,TimeUnit.MILLISECONDS)
 .build();

  }

  public static OkHttps getInstance(){
    if (mOkHttps==null){
      synchronized (OkHttps.class){
 if (mOkHttps==null){
   return mOkHttps=new OkHttps();
 }
      }
    }
    return mOkHttps;
  }

  public interface OkCallback{
    void onResponse(String json);

    void onFailure(Exception e);

  }

  public void doPost(String url, Map map, final OkCallback okCallback){
    FormBody.Builder builder = new FormBody.Builder();
    if (map!=null){
      for (String key:map.keySet()){
 builder.add(key,map.get(key));
      }
    }

    FormBody formBody = builder.build();

    final Request request = new Request.Builder()
 .post(formBody)
 .url(url)
 .build();

    Call call = mOkHttpClient.newCall(request);
    call.enqueue(new Callback() {
      @Override
      public void onFailure(Call call, final IOException e) {
 if (okCallback!=null){
   handler.post(new Runnable() {
     @Override
     public void run() {

okCallback.onFailure(e);
     }
   });
 }
      }

      @Override
      public void onResponse(Call call, Response response) throws IOException {

 try {
   if (response!=null && response.isSuccessful()){
     final String json = response.body().string();
     handler.post(new Runnable() {
@Override
public void run() {
  if (okCallback!=null){

    okCallback.onResponse(json);
    return;
  }
}
     });
   }
 }catch (IOException e){
   e.printStackTrace();
 }
 if (okCallback!=null){
   okCallback.onFailure(new Exception("网络异常"));
 }
      }
    });

  }
  public void doGet(String url, final OkCallback okCallback){
    Request request = new Request.Builder()
 .url(url)
 .build();

    Call call = mOkHttpClient.newCall(request);
    call.enqueue(new Callback() {
      @Override
      public void onFailure(Call call, final IOException e) {
 if (okCallback != null) {
   //切换到主线程
   handler.post(new Runnable() {
     @Override
     public void run() {
okCallback.onFailure(e);
     }
   });
 }
      }

      @Override
      public void onResponse(Call call, Response response) throws IOException {

 try {
   if (response != null && response.isSuccessful()) {
     final String json = response.body().string();
     handler.post(new Runnable() {
@Override
public void run() {
  if (okCallback != null) {
    okCallback.onResponse(json);
  }

}
     });
   }
 } catch (IOException e) {
   e.printStackTrace();
 }
      }
    });
  }
}

依赖

implementation 'com.google.code.gson:gson:2.8.5'
  implementation 'com.squareup.okhttp3:okhttp:3.12.0'
  implementation 'com.android.support:recyclerview-v7:27.1.1'
  implementation 'com.github.bumptech.glide:glide:3.7.0'

LoggingInterceptor.java //拦截器

class LoggingInterceptor implements Interceptor {
 @Override
 public Response intercept(Chain chain) throws IOException {
  //拿到Request对象
  Request request = chain.request();

  long t1 = System.nanoTime();
  System.out.println(" request = " + String.format("Sending request %s on %s%n%s",
      request.url(), chain.connection(), request.headers()));

  //拿到Response对象
  Response response = chain.proceed(request);

  long t2 = System.nanoTime();
  //得出请求网络,到得到结果,中间消耗了多长时间
  System.out.println("response " + String.format("Received response for %s in %.1fms%n%s",
      response.request().url(), (t2 - t1) / 1e6d, response.headers()));
  return response;
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。

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