Android购物分类效果实现

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;         }       }     });  }}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical">  <android.support.v4.view.ViewPager    android:id="@+id/pager"    android:layout_width="match_parent"    android:layout_height="0dp"    android:layout_weight="13"/>  <RadioGroup    android:id="@+id/group"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_weight="1"    android:orientation="horizontal">    <RadioButton      android:id="@+id/r1"      android:layout_width="wrap_content"      android:layout_weight="1"      android:layout_height="match_parent"      android:button="@null"      android:gravity="center"      android:text="首页"/>    <RadioButton      android:id="@+id/r2"      android:layout_width="wrap_content"      android:layout_weight="1"      android:layout_height="match_parent"      android:button="@null"      android:gravity="center"      android:text="分类"/>    <RadioButton      android:id="@+id/r3"      android:layout_width="wrap_content"      android:layout_weight="1"      android:layout_height="match_parent"      android:button="@null"      android:gravity="center"      android:text="购物车"/>  </RadioGroup></LinearLayout>

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<PubuBean.DataBean> 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) {      }    });  }}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent">  <android.support.v7.widget.RecyclerView    android:id="@+id/rv"    android:layout_width="match_parent"    android:layout_height="match_parent"/></LinearLayout>

public class PubuAdapter extends RecyclerView.Adapter<PubuAdapter.ViewHolder>{  private Context mContext;  ArrayList<PubuBean.DataBean> list;  public PubuAdapter(Context context) {    mContext = context;    list = new ArrayList<>();  }  public void setDatas(List<PubuBean.DataBean> 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);    }  }}

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<LeftBean.DataBean> 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<String, String> 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<RightBean.DataBean> 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) {      }    });  }}

<android.support.v7.widget.RecyclerView    android:id="@+id/rv1"    android:layout_width="0dp"    android:layout_weight="2"    android:layout_height="match_parent"/>  <android.support.v7.widget.RecyclerView    android:id="@+id/rv2"    android:layout_width="0dp"    android:layout_weight="10"    android:layout_height="match_parent"/></LinearLayout>

public class LeftAdapter extends RecyclerView.Adapter<LeftAdapter.ViewHolder>{  private Context mContext;  ArrayList<LeftBean.DataBean> list;  public LeftAdapter(Context context) {    mContext = context;    list = new ArrayList<>();  }  public void setDatas(List<LeftBean.DataBean> 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);    }  }}

public class RightAdapter extends RecyclerView.Adapter<RightAdapter.ViewHolder>{  private Context mContext;  ArrayList<RightBean.DataBean> list;  public RightAdapter(Context context) {    mContext = context;    list = new ArrayList<>();  }  public void setDatas(List<RightBean.DataBean> 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);    }  }}

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<String,String> 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();        }      }    });  }}

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'

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; }}