《周考技能测试题》

其他 2018-05-17 05:11:17 阅读次数: 2

添加网络权限：

<uses-permission android:name="android.permission.INTERNET" />

在build.gradle中添加：

//        greenDAO
//        整个工程中的build.gradle中添加：
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2'






在项目下的build.gradle中添加：
//    Glide
    compile 'com.github.bumptech.glide:glide:4.5.0'
    //    Retrofit
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    //    RxJava+Retrofit
    compile 'io.reactivex.rxjava2:rxjava:2.1.5'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    // AVLoadingIndicatorView，相当于进度条，有丰富的正在加载中的动画
    compile 'com.wang.avi:library:1.0.5'
    implementation 'com.android.support:recyclerview-v7:27.0.2'
    implementation 'com.android.support:appcompat-v7:27.0.2'



//    app模块下的build.gradle中添加：
    compile 'org.greenrobot:greendao:3.2.2'





布局文件activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.wang.avi.AVLoadingIndicatorView
        app:indicator_color="@color/colorAccent"
        android:layout_centerInParent="true"
        android:id="@+id/loading_view"
        app:indicator="Pacman"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        app:layoutManager="android.support.v7.widget.LinearLayoutManager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>






布局文件item_food.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <TextView
        android:id="@+id/title_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/delete_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:background="#f00"
        android:text="删除"
        android:textColor="#fff" />

    <ImageView
        android:id="@+id/pic_iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/title_tv" />

</RelativeLayout>



全局代码文件activity文件夹下MainActivity.java
package com.estyle.day0127.activity;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.estyle.day0127.R;
import com.estyle.day0127.adapter.FoodAdaoter;
import com.estyle.day0127.application.MyApplication;
import com.estyle.day0127.bean.DataBean;
import com.estyle.day0127.bean.DataBeanDao;
import com.estyle.day0127.bean.FoodBean;
import com.estyle.day0127.httpservice.FoodHttpService;
import com.wang.avi.AVLoadingIndicatorView;

import java.util.List;

import io.reactivex.Observable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Consumer;
import io.reactivex.functions.Function;
import io.reactivex.schedulers.Schedulers;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * 下载过程中，展示数据之前，展示加载进度UI控件AVLoadingIndicatorView
 * 1、各种导包，各种布局
 * 使用Retrofit + RxJava下载数据
 * 数据在RecyclerView上展示文字，图片使用Glide（版本4，只能用在studio3上）框架加载，圆角
 */
// http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&page=1
public class MainActivity extends AppCompatActivity {

    protected AVLoadingIndicatorView mLoadingView;
    protected RecyclerView mRecyclerView;
    private Retrofit mRetrofit;
    private FoodAdaoter mAdaoter;
    private DataBeanDao mDao;

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

        // 初始化greenDAO
        mDao = MyApplication.getDaoSession()
                .getDataBeanDao();

        initView();

        loadData();
    }

    private void loadData() {
        // 构建retrofit
        mRetrofit = new Retrofit.Builder()
                .baseUrl("http://www.qubaobei.com/")
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();
        // 获取接口实例，并获取其中的观察者
        FoodHttpService httpService = mRetrofit.create(FoodHttpService.class);
        Observable<FoodBean> observable = httpService.getObservable(1);
        // 自动下载数据并设置数据源, 指定数据下载线程为子线程，数据变换
        observable.subscribeOn(Schedulers.io())
                .map(new Function<FoodBean, List<DataBean>>() {
                    @Override
                    public List<DataBean> apply(FoodBean foodBean) throws Exception {
                        return foodBean.getData();
                    }
                })
        // 换回主线程展示
        .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<List<DataBean>>() {
                    @Override
                    public void accept(List<DataBean> dataBeans) throws Exception {
                        // 下载数据成功，存入数据库
                        for (DataBean data : dataBeans) {
                            data.set_id(System.currentTimeMillis());
                            mDao.insert(data);
                        }
                        // 存储完毕后，从数据库读取数据
                        List<DataBean> datas = mDao.queryBuilder()
                                .build()
                                .list();

                        mAdaoter.addDatas(datas);
                        // 成功展示数据后，隐藏正在加载进度视图
                        mLoadingView.setVisibility(View.GONE);
                    }
                });
    }

    private void initView() {
        mLoadingView = (AVLoadingIndicatorView) findViewById(R.id.loading_view);
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        // 适配器伴随RecyclerView诞生而诞生，直接绑定，等数据获取到了再展示
        mAdaoter = new FoodAdaoter(this);
        mRecyclerView.setAdapter(mAdaoter);
    }
}


全局代码文件adapter文件夹下FoodAdaoter.java

package com.estyle.day0127.adapter;


import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.resource.bitmap.RoundedCorners;
import com.bumptech.glide.request.RequestOptions;
import com.estyle.day0127.R;
import com.estyle.day0127.application.MyApplication;
import com.estyle.day0127.bean.DataBean;
import com.estyle.day0127.bean.DataBeanDao;

import java.util.ArrayList;
import java.util.List;

public class FoodAdaoter extends RecyclerView.Adapter<FoodAdaoter.ViewHolder> {

    private final DataBeanDao mDao;
    private Context mContext;
    private List<DataBean> mDatas;

    public FoodAdaoter(Context context) {
        mContext = context;
        mDatas = new ArrayList<>();

        // 初始化Dao，用于删除数据
        mDao = MyApplication.getDaoSession()
                .getDataBeanDao();
    }

    // 添加数据
    public void addDatas(List<DataBean> datas) {
        mDatas.addAll(datas);
        notifyDataSetChanged();
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(mContext)
                .inflate(R.layout.item_food, parent, false);
        return new ViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        final DataBean data = mDatas.get(position);

        holder.mTitleTextView.setText(data.getTitle());

        // 请求加载图片的配置项，可以扩展圆角，圆图等功能
        // 注意：该配置项是Glide4版本独有的功能，需要studio3使用
        RequestOptions options = new RequestOptions();
        // 变换为圆角
        options.transform(new RoundedCorners(200));

        // 使用Glide框架展示图片
        Glide.with(mContext)
                .load(data.getPic())
                .apply(options)// 应用我们额外的配置项
                .into(holder.mPicImageView);


        // 删除数据按钮点击监听
        holder.mDeleteBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 删除数据库对应数据
                mDao.delete(data);
                // 删除UI界面上item对应展示的数据并刷新
                mDatas.remove(position);
                notifyDataSetChanged();
                Toast.makeText(mContext, "成功删除第" + position + "条数据", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return mDatas == null ? 0 : mDatas.size();
    }

    static class ViewHolder extends RecyclerView.ViewHolder {

        Button mDeleteBtn;
        TextView mTitleTextView;
        ImageView mPicImageView;

        public ViewHolder(View itemView) {
            super(itemView);
            mDeleteBtn = itemView.findViewById(R.id.delete_btn);
            mTitleTextView = itemView.findViewById(R.id.title_tv);
            mPicImageView = itemView.findViewById(R.id.pic_iv);
        }
    }

}


全局代码文件application文件夹下MyApplication.java

package com.estyle.day0127.application;

import android.app.Application;

import com.estyle.day0127.bean.DaoMaster;
import com.estyle.day0127.bean.DaoSession;

import org.greenrobot.greendao.database.Database;

public class MyApplication extends Application {

    private static DaoSession sDaoSession;

    @Override
    public void onCreate() {
        super.onCreate();
        initGreenDAO();
    }

    private void initGreenDAO() {
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, "food.db");
        Database db = helper.getWritableDb();
        sDaoSession = new DaoMaster(db).newSession();
    }

    public static DaoSession getDaoSession() {
        return sDaoSession;
    }
}

全局代码文件bean文件夹下DataBean.java

package com.estyle.day0127.bean;

import org.greenrobot.greendao.annotation.Entity;
import org.greenrobot.greendao.annotation.Id;
import org.greenrobot.greendao.annotation.Generated;

@Entity
public  class DataBean {
    /**
     * id : 8289
     * title : 油焖大虾
     * pic : http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.jpg
     * collect_num : 1653
     * food_str : 大虾 葱 生姜 植物油 料酒
     * num : 1653
     */

    @Id(autoincrement = true)
    private long _id;

    private String id;
    private String title;
    private String pic;
    private String collect_num;
    private String food_str;
    private int num;
    @Generated(hash = 1343076215)
    public DataBean(long _id, String id, String title, String pic,
            String collect_num, String food_str, int num) {
        this._id = _id;
        this.id = id;
        this.title = title;
        this.pic = pic;
        this.collect_num = collect_num;
        this.food_str = food_str;
        this.num = num;
    }
    @Generated(hash = 908697775)
    public DataBean() {
    }
    public long get_id() {
        return this._id;
    }
    public void set_id(long _id) {
        this._id = _id;
    }
    public String getId() {
        return this.id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getTitle() {
        return this.title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getPic() {
        return this.pic;
    }
    public void setPic(String pic) {
        this.pic = pic;
    }
    public String getCollect_num() {
        return this.collect_num;
    }
    public void setCollect_num(String collect_num) {
        this.collect_num = collect_num;
    }
    public String getFood_str() {
        return this.food_str;
    }
    public void setFood_str(String food_str) {
        this.food_str = food_str;
    }
    public int getNum() {
        return this.num;
    }
    public void setNum(int num) {
        this.num = num;
    }

}

全局代码文件bean文件夹下FoodBean.java

package com.estyle.day0127.bean;

import java.util.List;

public class FoodBean {
    /**
     * ret : 1
     * data : [{"id":"8289","title":"油焖大虾","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.jpg","collect_num":"1653","food_str":"大虾 葱 生姜 植物油 料酒","num":1653},{"id":"2127","title":"四川回锅肉","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2127.jpg","collect_num":"1585","food_str":"猪肉 青蒜 青椒 红椒 姜片","num":1585},{"id":"30630","title":"超简单芒果布丁","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/31/30630.jpg","collect_num":"1519","food_str":"QQ糖 牛奶 芒果","num":1519},{"id":"9073","title":"家常红烧鱼","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9073.jpg","collect_num":"1416","food_str":"鲜鱼 姜 葱 蒜 花椒","num":1416},{"id":"10097","title":"家常煎豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10097.jpg","collect_num":"1404","food_str":"豆腐 新鲜红椒 青椒 葱花 油","num":1404},{"id":"10509","title":"水煮肉片","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10509.jpg","collect_num":"1335","food_str":"瘦猪肉 生菜 豆瓣酱 干辣椒 花椒","num":1335},{"id":"46968","title":"红糖苹果银耳汤","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/47/46968.jpg","collect_num":"1244","food_str":"银耳 苹果 红糖","num":1244},{"id":"10191","title":"麻婆豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10191.jpg","collect_num":"1212","food_str":"豆腐 肉末 生抽 白糖 芝麻油","num":1212},{"id":"2372","title":"皮蛋瘦肉粥","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2372.jpg","collect_num":"1143","food_str":"大米 皮蛋 猪肉 油条 香葱","num":1143},{"id":"2166","title":"蚂蚁上树","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2166.jpg","collect_num":"1138","food_str":"红薯粉 肉 姜 蒜 花椒","num":1138}]
     */

    private int ret;
    private List<DataBean> data;

    public int getRet() {
        return ret;
    }

    public void setRet(int ret) {
        this.ret = ret;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }


}

全局代码文件httpservice文件夹下FoodHttpService.java

package com.estyle.day0127.httpservice;


import com.estyle.day0127.bean.FoodBean;

import io.reactivex.Observable;
import retrofit2.http.GET;
import retrofit2.http.Query;

public interface FoodHttpService {

    @GET("ios/cf/dish_list.php?stage_id=1&limit=10")
    Observable<FoodBean> getObservable(@Query("page") int page);

}

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