中国建材小项目

实现效果

MVC设计模式

Utils工具类

public class OkhttpUtils {
    private static final int time = 60*1000;
    private static OkhttpUtils okhttpUtils = null;
    private OkHttpClient client;//client
    private Handler handler = new Handler();//主线程回调

    private OkhttpUtils(){
        //设置拦截器
        HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
        httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

        //单例创建client
        client = new OkHttpClient.Builder()
                .connectTimeout(time, TimeUnit.MILLISECONDS)
                .writeTimeout(time, TimeUnit.MILLISECONDS)
                .readTimeout(time, TimeUnit.MILLISECONDS)
                .build();
    }

    //双重校验锁
    public static OkhttpUtils getInstance(){
        if (okhttpUtils == null){
            synchronized (String.class){
                if (okhttpUtils == null){
                    okhttpUtils = new OkhttpUtils();
                }
            }
        }
        return okhttpUtils;
    }

    /**
     * get请求json数据
     *
     * @param url              网络接口
     * @param myOkhttpCallBack 接口返回数据
     */
    public void doGet(String url, final MyOkhttpCallBack myOkhttpCallBack, final int code) {
        Request request = new Request.Builder()
                .url(url)
                .get()
                .build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                final String message = e.getMessage();
                //子线程
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        //主线程
                        if (myOkhttpCallBack != null) {
                            myOkhttpCallBack.onError(message);
                        }
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                final String json = response.body().string();
                //子线程
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        //主线程
                        if (myOkhttpCallBack != null) {
                            myOkhttpCallBack.onOk(json,code);
                        }
                    }
                });
            }
        });
    }

}

callback回调

public interface MyOkhttpCallBack {
    void onOk(String json,int code);
    void onError(String message);
}

Model层

model接口

public interface HomeModel {
    void getBannerData(MyOkhttpCallBack myOkhttpCallBack);//轮播图数据
    void getMenuData(MyOkhttpCallBack myOkhttpCallBack);//中间菜单数据
    void getTypeData(MyOkhttpCallBack myOkhttpCallBack);//产品分类
}

modelImpl

public class HomeModelImpl implements HomeModel {
    @Override
    public void getBannerData(MyOkhttpCallBack myOkhttpCallBack) {
        OkhttpUtils.getInstance().doGet(NetConfig.BANNER_URL,myOkhttpCallBack,NetConfig.CODE_BANNER);
    }

    @Override
    public void getMenuData(MyOkhttpCallBack myOkhttpCallBack) {
        OkhttpUtils.getInstance().doGet(NetConfig.MENU_RUL,myOkhttpCallBack,NetConfig.CODE_MENU);
    }

    @Override
    public void getTypeData(MyOkhttpCallBack myOkhttpCallBack) {
        OkhttpUtils.getInstance().doGet(NetConfig.TYPE_URL,myOkhttpCallBack,NetConfig.CODE_TYPE);
    }
}

创建Base包

base包可以使代码变得简洁，主要是Activity和Fragment

Activity——Base包

public abstract class BaseActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(layoutId());//不写具体布局
        initView();
        initData();
    }

    protected abstract void initData();//初始化数据

    protected abstract void initView();//初始化控件

    protected abstract int layoutId();//加载布局


    //页面跳转
    public void startActivity(Class class_){
        Intent intent = new Intent(this,class_);
        startActivity(intent);
    }
}

Fragment——Base包

public abstract class BaseFragment extends Fragment {

    private View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        view = inflater.inflate(layoutId(), container, false);
        initView(view);//传入view
        initData();
        return view;


    }

    protected abstract void initData();

    protected abstract void initView(View view);

    public abstract int layoutId();

}

主页面样式

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="15"></androidx.viewpager.widget.ViewPager>

    <com.flyco.tablayout.CommonTabLayout
        android:id="@+id/common"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:tl_iconHeight="20dp"
        app:tl_iconWidth="20dp"
        app:tl_textSelectColor="#2196F3"
        app:tl_textUnselectColor="#000"
        app:tl_textsize="10sp"></com.flyco.tablayout.CommonTabLayout>

</LinearLayout>

主页面的代码

public class MainActivity extends BaseActivity {

    private ViewPager viewpager;
    private CommonTabLayout common;
    private ArrayList<CustomTabEntity> list = new ArrayList<>();
    private List<Fragment> fragmentList = new ArrayList<>();
    private FragmentAdapter fragmentAdapter;


    @Override
    protected void initData() {

    }

    @Override
    protected void initView() {
        initRegister();

        common = (CommonTabLayout) findViewById(R.id.common);
        list.add(new MyTabEntity("首页", R.drawable.select_1, R.drawable.default_1));
        list.add(new MyTabEntity("供应", R.drawable.select_2, R.drawable.default_2));
        list.add(new MyTabEntity("品牌", R.drawable.select_3, R.drawable.default_3));
        list.add(new MyTabEntity("个人中心", R.drawable.select_4, R.drawable.default_4));
        common.setTabData(list);

        viewpager = (ViewPager) findViewById(R.id.viewpager);
        fragmentList.add(new HomeFragment());
        fragmentList.add(new GongyingFragment());
        fragmentList.add(new PinpaiFragment());
        fragmentList.add(new MyFragment());
        fragmentAdapter = new FragmentAdapter(getSupportFragmentManager(), fragmentList);
        viewpager.setAdapter(fragmentAdapter);

        //TODO：点击底部切换
        common.setOnTabSelectListener(new OnTabSelectListener() {
            @Override
            public void onTabSelect(int position) {
                viewpager.setCurrentItem(position);
            }

            @Override
            public void onTabReselect(int position) {

            }
        });

        //TODO：滑动切换
        viewpager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                common.setCurrentTab(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

    }

    private void initRegister() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.ACCESS_NETWORK_STATE,
                    Manifest.permission.ACCESS_WIFI_STATE,
                    Manifest.permission.READ_PHONE_STATE,
                    Manifest.permission.ACCESS_COARSE_LOCATION
            }, 100);
        }
    }

    @Override
    protected int layoutId() {
        return R.layout.activity_main;
    }   
}

Fragment

布局样式

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".fragment.HomeFragment">


    <androidx.appcompat.widget.Toolbar
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#2196F3">

        <LinearLayout
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <ImageView
                android:src="@drawable/sao"
                android:layout_width="25dp"
                android:layout_height="25dp">
            </ImageView>
            <TextView
                android:drawablePadding="5dp"
                android:padding="5dp"
                android:drawableLeft="@drawable/icon_seacher"
                android:gravity="center_vertical"
                android:textColor="@color/colorWhite"
                android:text="请输入要搜索的信息"
                android:background="@drawable/shape_search_bg"
                android:layout_marginRight="10dp"
                android:layout_marginLeft="10dp"
                android:id="@+id/tv_search"
                android:layout_width="270dp"
                android:layout_height="30dp">
            </TextView>

            <ImageView
                android:src="@drawable/man"
                android:layout_width="25dp"
                android:layout_height="25dp">
            </ImageView>

        </LinearLayout>

    </androidx.appcompat.widget.Toolbar>

    <com.youth.banner.Banner
        android:id="@+id/banner"
        android:layout_width="match_parent"
        android:layout_height="160dp"></com.youth.banner.Banner>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_menu"
        android:layout_width="match_parent"
        android:layout_height="190dp"></androidx.recyclerview.widget.RecyclerView>

    <View
        android:layout_width="match_parent"
        android:layout_height="8dp"
        android:background="#eee"></View>

    <TextView
        android:textColor="#52B2F4"
        android:padding="3dp"
        android:text="产品分类"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_type"
        android:layout_width="match_parent"
        android:layout_height="190dp"></androidx.recyclerview.widget.RecyclerView>


</LinearLayout>

定义一个Net文件存储需要用到接口及常量

public class NetConfig {
    //接口前段地址
    public static final String BASE_URL = "http://api.yunzhancn.cn/api/app.interface.php?siteid=78703&";
    //首页头部banner轮播接口 itemid=2&act=ad_app
    public static final String BANNER_URL = BASE_URL + "itemid=2&act=ad_app";
    //首页中间菜单接口 act=column&ctype=4
    public static final String MENU_RUL = BASE_URL + "act=column&ctype=4";
    //首页产品分类接口 act=column&ctype=2&mid=16
    public static final String TYPE_URL = BASE_URL + "act=column&ctype=2&mid=16";

    //区分同一个页面，不同请求的数据
    public static final int CODE_BANNER = 101;
    public static final int CODE_MENU = 102;
    public static final int CODE_TYPE = 103;
}

Home页面核心代码

public class HomeFragment extends BaseFragment implements MyOkhttpCallBack {
    private HomeModel homeModel;
    private TextView tv_search;
    private Banner banner;
    private RecyclerView rvMenu;
    private RecyclerView rvType;
    private ArrayList<String> list_image = new ArrayList<>();
    private ArrayList<MenuEntity> list_menu = new ArrayList<>();
    private ArrayList<TypeEntity> list_type = new ArrayList<>();
    private MyMenuAdapter menuAdapter;
    private MyFenAdapter fenAdapter;


    @Override
    protected void initData() {
        homeModel = new HomeModelImpl();
        //TODO:banner数据
        homeModel.getBannerData(this);
        //TODO:menu数据
        homeModel.getMenuData(this);
        //TODO:type数据
        homeModel.getTypeData(this);
    }

    @Override
    protected void initView(View view) {
        tv_search = (TextView) view.findViewById(R.id.tv_search);
        banner = (Banner) view.findViewById(R.id.banner);
        rvMenu = (RecyclerView) view.findViewById(R.id.rv_menu);
        menuAdapter = new MyMenuAdapter(R.layout.item_menu, list_menu);
        rvMenu.setAdapter(menuAdapter);
        rvMenu.setLayoutManager(new GridLayoutManager(getContext(), 4));

        rvType = (RecyclerView) view.findViewById(R.id.rv_type);
        fenAdapter = new MyFenAdapter(R.layout.item_fenlei,list_type);
        rvType.setAdapter(fenAdapter);
        rvType.setLayoutManager(new GridLayoutManager(getContext(), 4));

        //搜索
        Drawable drawable=getResources().getDrawable(R.drawable.icon_seacher);//放大镜
        drawable.setBounds(0,0,50,50);//第一0是距左边距离，第二0是距上边距离 30 30 宽度和高度
        tv_search.setCompoundDrawables(drawable,null,null,null);//textView设置左边图片
    }

    @Override
    public int layoutId() {
        return R.layout.fragment_home;
    }

    @Override
    public void onOk(String json, int code) {
        //TODO 1:必须是网络请求成功之后
        if (code == NetConfig.CODE_BANNER) {
            //原生解析数组
            try {
                JSONArray jsonArray = new JSONArray(json);
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    String image_src = jsonObject.getString("image_src");
                    list_image.add(image_src);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            banner.setImages(list_image);//设置图片集合
            banner.setImageLoader(new ImageLoader() {//设置图屁啊家加载起
                @Override
                public void displayImage(Context context, Object path, ImageView imageView) {
                    Glide.with(context).load(path).into(imageView);
                }
            });
            banner.start();//启动
        } else if (code == NetConfig.CODE_MENU) {
            list_menu.clear();
            Gson gson = new Gson();
            ArrayList<MenuEntity> menuEntities = gson.fromJson(json, new TypeToken<ArrayList<MenuEntity>>() {
            }.getType());
            list_menu.addAll(menuEntities);
            menuAdapter.notifyDataSetChanged();
        }else if (code == NetConfig.CODE_TYPE){
            list_type.clear();
            Gson gson = new Gson();
            ArrayList<TypeEntity> typeEntities = gson.fromJson(json, new TypeToken<ArrayList<TypeEntity>>() {
            }.getType());
            list_type.addAll(typeEntities);
            fenAdapter.notifyDataSetChanged();
        }
    }

    @Override
    public void onError(String message) {
        Toast.makeText(getActivity(), "" + message, Toast.LENGTH_SHORT).show();
    }
}