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最新推荐文章于 2024-05-09 01:14:47 发布

呦~昂

最新推荐文章于 2024-05-09 01:14:47 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qq_42120436/article/details/88097676

本文深入探讨了MVVM(Model-View-ViewModel)架构在Android应用开发中的应用，详细讲解了ViewModel层、View层和Model层的职责划分，以及它们之间的交互方式。通过具体的代码实例，展示了如何使用MVVM架构来组织代码，实现数据的双向绑定，提高开发效率和代码的可维护性。

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Contract

//V层
public interface Zuo_View_interface{
    //数据刷新
    public void showData(String message);
    public void show_RightData(String message);
    public void show_GoodData(String message2);
}

//P层
public interface Zuo_Presenter_interface<Zuo_View_interface>{
    //绑定
    public void attahView(Zuo_View_interface zuo_view_interface);
    //解绑
    public void deathView(Zuo_View_interface zuo_view_interface);
    //M层交互
    public void requestData();
    public void request_RightData(String id);
    public void request_GoodData(String id);
}

//M层
public interface Zuo_Model_interface{
    //网络请求数据--左侧
    public void getJson(Callback_Zuo callback_zuo);
    //接口回调
    public interface Callback_Zuo{
        //数据回传
        public void responseData(String message);
    }

    //网络请求数据--右侧
    public void getRightJson(String id, Callback_Right callback_right);
    //接口回调
    public interface Callback_Right{
        //数据回传
        public void response_RightData(String message);
    }

    //网络请求数据--商品
    public void getGoodJson(String id, Callback_Good callback_good);
    //接口回调
    public interface Callback_Good{
        //数据回传
        public void response_GoodData(String message2);
    }

}

presenter

public class Presenter_Zuo implements Contract_Zuo.Zuo_Presenter_interface<Contract_Zuo.Zuo_View_interface> {
    Contract_Zuo.Zuo_View_interface zuo_view_interface;
    private Model_Zuo model_zuo;
    private SoftReference<Model_Zuo> reference;

    @Override
    public void attahView(Contract_Zuo.Zuo_View_interface zuo_view_interface) {
        this.zuo_view_interface=zuo_view_interface;
        model_zuo = new Model_Zuo();
        reference = new SoftReference<>( model_zuo );
    }

    @Override
    public void deathView(Contract_Zuo.Zuo_View_interface zuo_view_interface) {
reference.clear();
    }

    @Override
    public void requestData() {
        model_zuo.getJson( new Contract_Zuo.Zuo_Model_interface.Callback_Zuo() {
            @Override
            public void responseData(String message) {
                zuo_view_interface.showData(message);
            }
        } );
    }

    @Override
    public void request_RightData(String id) {
        model_zuo.getRightJson( id,new Contract_Zuo.Zuo_Model_interface.Callback_Right() {
            @Override
            public void response_RightData(String message1) {
                zuo_view_interface.show_RightData(message1);
            }
        } );
    }

    @Override
    public void request_GoodData(String id1) {
        model_zuo.getGoodJson( id1, new Contract_Zuo.Zuo_Model_interface.Callback_Good() {
            @Override
            public void response_GoodData(String message2) {
                zuo_view_interface.show_GoodData(message2);
            }
        } );
    }

}

model

public class Model_Zuo implements Contract_Zuo.Zuo_Model_interface {
    @Override
    public void getJson(final Callback_Zuo callback_zuo) {
        OkHttpUtil.getGetJson( Constant.ZUOCE_URL, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String message = response.body().string();
                callback_zuo.responseData(message);
                Log.i( "zjm",message );
            }
        } );
    }

    @Override
    public void getRightJson(String id, final Callback_Right callback_right) {
        OkHttpUtil.getGetJson( Constant.YOUCE_URL+"?firstCategoryId="+id, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String message1 = response.body().string();
                callback_right.response_RightData(message1);
            }
        } );
    }

    @Override
    public void getGoodJson(String id1, final Callback_Good callback_good) {
        OkHttpUtil.getGetJson( Constant.GOOD_URL + "?categoryId=" + id1 + "&page=" + 1 + "&count=" + 5, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String message2 = response.body().string();
                callback_good.response_GoodData(message2);
            }
        } );
    }

}

MainActivity

  //创建fragment
    shouFragment = new ShouFragment();
    mineFragment = new MineFragment();
    transaction = getSupportFragmentManager().beginTransaction();
    transaction.add(R.id.frame, shouFragment);
    transaction.add(R.id.frame, mineFragment);
    //show..hide
    transaction.show(shouFragment).hide(mineFragment).commit();
    group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            //创建对象
            FragmentTransaction transaction = getSupportFragmentManager()
                    .beginTransaction();
            switch (checkedId){
                case R.id.shou:
                    transaction.show(shouFragment).hide(mineFragment);
                    break;
                case R.id.mine:
                    transaction.show(mineFragment).hide(shouFragment);
                    break;
            }
            transaction.commit();
        }
    });
}

shouFragment

public class ShouFragment extends Fragment implements Contract_Zuo.Zuo_View_interface {

    private Presenter_Zuo presenter_zuo;
    private RecyclerView rv_left;
    private RecyclerView rv_right;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_shou, container, false);
        //新建P层
        rv_left = view.findViewById(R.id.rv_left);
        rv_right = view.findViewById(R.id.rv_right);
        presenter_zuo = new Presenter_Zuo();
        presenter_zuo.attahView(this);
        presenter_zuo.requestData();//请求接口--左侧数据
        if (Build.VERSION.SDK_INT >= 23) {
            String[] mPermissionList = new String[]{
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.ACCESS_FINE_LOCATION,
                    Manifest.permission.CALL_PHONE,
                    Manifest.permission.READ_LOGS,
                    Manifest.permission.READ_PHONE_STATE,
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.SET_DEBUG_APP,
                    Manifest.permission.SYSTEM_ALERT_WINDOW,
                    Manifest.permission.GET_ACCOUNTS,
                    Manifest.permission.WRITE_APN_SETTINGS,
                    Manifest.permission.CAMERA};
            ActivityCompat.requestPermissions(getActivity(), mPermissionList, 123);
        }
        return view;
    }

    @Override
    public void showData(final String message) {
        getActivity().runOnUiThread( new Runnable() {
            @Override
            public void run() {
                //Toast.makeText( MainActivity.this, ""+message, Toast.LENGTH_SHORT ).show();
                Gson gson = new Gson();
                Bean_Zuo bean_zuo = gson.fromJson( message, Bean_Zuo.class );
                final List<Bean_Zuo.ResultBean> list_zuo = bean_zuo.getResult();
                Adapter_Zuo adapter_zuo = new Adapter_Zuo( R.layout.item_left, list_zuo );
                LinearLayoutManager linearLayoutManager = new LinearLayoutManager( getActivity(), LinearLayoutManager.VERTICAL, false );
                //rv_left.setLayoutManager(linearLayoutManager);
                rv_left.setLayoutManager( linearLayoutManager );
                rv_left.setAdapter( adapter_zuo );

                //适配器点击事件
                adapter_zuo.setOnItemClickListener( new BaseQuickAdapter.OnItemClickListener() {
                    @Override
                    public void onItemClick(BaseQuickAdapter adapter, View view, int position) {
                        long itemId = adapter.getItemId( position );//下标
                        String id = list_zuo.get( (int) itemId ).getId();//集合的id
                        //Toast.makeText( MainActivity.this, ""+id, Toast.LENGTH_SHORT ).show();
                        presenter_zuo.request_RightData(id);//请求接口--右侧数据
                    }
                } );
            }
        } );
    }

    @Override
    public void show_RightData(final String message) {
        getActivity().runOnUiThread( new Runnable() {
            @Override
            public void run() {
                //Toast.makeText( MainActivity.this, ""+message1, Toast.LENGTH_SHORT ).show();
                Gson gson = new Gson();
                Bean_You bean_you = gson.fromJson( message, Bean_You.class );
                final List<Bean_You.ResultBean> list_you = bean_you.getResult();
                Adapter_You adapter_you = new Adapter_You( R.layout.item_right, list_you );
                LinearLayoutManager linearLayoutManager = new LinearLayoutManager( getActivity(), LinearLayoutManager.VERTICAL, false );
                rv_right.setLayoutManager( linearLayoutManager );
                rv_right.setAdapter( adapter_you );
            }
        } );
    }

    @Override
    public void show_GoodData(String message) {
        getActivity().runOnUiThread( new Runnable() {
            @Override
            public void run() {
                //Toast.makeText( MainActivity.this, ""+message2, Toast.LENGTH_SHORT ).show();

                /*Gson gson = new Gson();
                Bean_Good bean_good = gson.fromJson( message2, Bean_Good.class );
                List<Bean_Good.ResultBean> list_good = bean_good.getResult();
                Adapter_Good adapter_good = new Adapter_Good( R.layout.item_good, list_good );
                GridLayoutManager gridLayoutManager = new GridLayoutManager( MainActivity.this, 3 );
                rv_good.setLayoutManager( gridLayoutManager );
                rv_good.setAdapter( adapter_good );*/
            }
        } );
    }
    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }
}

Adapter_Zuo

public class Adapter_Zuo extends BaseQuickAdapter<Bean_Zuo.ResultBean,BaseViewHolder> {
    public Adapter_Zuo(int layoutResId, @Nullable List<Bean_Zuo.ResultBean> data) {
        super( layoutResId, data );
    }
    @Override
    protected void convert(BaseViewHolder helper, Bean_Zuo.ResultBean item) {
        helper.setText( R.id.tv_left_name,item.getName() );
    }
}

Adapter_You

public class Adapter_You extends BaseQuickAdapter<Bean_You.ResultBean,BaseViewHolder> {

    private List<Bean_Good.ResultBean> list_good;

    public Adapter_You(int layoutResId, @Nullable List<Bean_You.ResultBean> data) {
        super( layoutResId, data );
    }

    @Override
    protected void convert(BaseViewHolder helper, Bean_You.ResultBean item) {
        helper.setText( R.id.tv_you_name,item.getName() );

        String id = item.getId();//得到第二条数据的id
        Toast.makeText( mContext, ""+id, Toast.LENGTH_SHORT ).show();
        final RecyclerView rv_good = helper.getView( R.id.rv_good );
        OkHttpUtil.getGetJson( Constant.GOOD_URL + "?categoryId=" + id + "&page=" + 1 + "&count=" + 5, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String message = response.body().string();
                //解析数据
                Gson gson = new Gson();
                Bean_Good bean_good = gson.fromJson( message, Bean_Good.class );
                list_good = bean_good.getResult();
            }
        } );
        //给商品rv设置适配器
        //Toast.makeText( mContext, ""+list_good, Toast.LENGTH_SHORT ).show();
        GridLayoutManager gridLayoutManager = new GridLayoutManager( mContext, 3 );
        rv_good.setLayoutManager( gridLayoutManager );
        Adapter_Good adapter_good = new Adapter_Good( R.layout.item_good, list_good );
        rv_good.setAdapter( adapter_good );


    }
}

Adapter_Goods
public class Adapter_Good extends BaseQuickAdapter<Bean_Good.ResultBean,BaseViewHolder> {
    public Adapter_Good(int layoutResId, @Nullable List<Bean_Good.ResultBean> data) {
        super( layoutResId, data );
    }

    @Override
    protected void convert(BaseViewHolder helper, Bean_Good.ResultBean item) {
        ImageView img_good = helper.getView( R.id.img_good );
        Glide.with( mContext ).load( item.getMasterPic() ).into( img_good );
        helper.setText( R.id.tv_good_name,item.getCommodityName() );
    }
}

activity_shou

//左侧
<android.support.v7.widget.RecyclerView
    android:id="@+id/rv_left"
    android:layout_width="0dp"
    android:layout_weight="2"
    android:background="#CCCCCC"
    android:layout_height="match_parent">

</android.support.v7.widget.RecyclerView>

//右侧
<android.support.v7.widget.RecyclerView
    android:id="@+id/rv_right"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="8">

</android.support.v7.widget.RecyclerView>

item_left

TextView
    android:id="@+id/tv_left_name"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:gravity="center"
    android:text="商品名称"/>

item_right

<TextView
    android:id="@+id/tv_you_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="30dp"
    android:textColor="#f00"
    android:text="商品名称"/>

<android.support.v7.widget.RecyclerView
    android:id="@+id/rv_good"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</android.support.v7.widget.RecyclerView>

item_goods

<android.support.v7.widget.CardView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    app:cardCornerRadius="10dp">
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:orientation="vertical">
    //图片
    <ImageView
        android:id="@+id/img_good"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:src="@mipmap/ic_launcher"/>
    //name
    <TextView
        android:id="@+id/tv_good_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:ellipsize="end"
        android:singleLine="true"
        android:layout_marginTop="3dp"
        android:text="namee"/>
</LinearLayout>
</android.support.v7.widget.CardView>