listView利用BaseAdapter及异步任务Gson解析，使用Picasso网络获取资源进行图文混排，PullToRefresh上拉刷新下拉加载

最新推荐文章于 2018-04-27 08:10:21 发布
原创 最新推荐文章于 2018-04-27 08:10:21 发布 · 333 阅读 · 0 ·
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比较综合的一个案例，同样的要导library包以及gson和picasso，在我们需要实现从网络获取数据时，要在manifests文件中加权限

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


先是MainActivity

public class MainActivity extends AppCompatActivity {
    String url="http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=";
    int index=1;
    private PullToRefreshListView lv;
    List<Map<String,String>> list;
    MyAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv=(PullToRefreshListView)findViewById(R.id.lv);
        list=new ArrayList<>();
        adapter=new MyAdapter(this,list);
        lv.setAdapter(adapter);
        getData();
        lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {
            @Override
            public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                index=1;
                list.clear();
                getData();
            }
        });

        lv.setOnLastItemVisibleListener(new PullToRefreshBase.OnLastItemVisibleListener() {
            @Override
            public void onLastItemVisible() {
                index++;
                getData();
            }
        });
        lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                list.remove(position);
                adapter.notifyDataSetChanged();
                return true;
            }
        });

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                HashMap<String,String> map=(HashMap<String, String>) list.get(position-1);
                Food.DataBean bean=new Food.DataBean();
                bean.setCollect_num(map.get("collnum"));
                bean.setFood_str(map.get("str"));
                bean.setId(map.get("id"));
                bean.setNum(Integer.valueOf(map.get("num")));
                bean.setPic(map.get("img"));
                bean.setTitle(map.get("title"));
                Intent intent=new Intent(MainActivity.this,Main2Activity.class);
                intent.putExtra("bean",bean);
                startActivity(intent);
            }
        });
    }

    public void getData(){
        new MyAsyncTask(new MyAsyncTask.CallBack() {
            @Override
            public void sendResult(String json) {
                Gson gson=new Gson();
                Food food = gson.fromJson(json, Food.class);
                for (int i=0;i<food.getData().size();i++){
                    Map<String,String> map=new HashMap<String, String>();
                    map.put("img",food.getData().get(i).getPic());
                    map.put("title",food.getData().get(i).getTitle());
                    map.put("id",food.getData().get(i).getId());
                    map.put("num",String.valueOf(food.getData().get(i).getNum()));
                    map.put("collnum",food.getData().get(i).getCollect_num());
                    map.put("str",food.getData().get(i).getFood_str());

                    list.add(map);
                }
                adapter.notifyDataSetChanged();
                lv.onRefreshComplete();
            }
        }).execute(url+index);
    }
}
适配器 

public class MyAdapter extends BaseAdapter {
    List<Map<String,String>> list;
    Context context;
    public MyAdapter(Context context,List<Map<String,String>> list){
        this.list=list;
        this.context=context;
    }

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

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder vh;
        if(convertView==null){
            vh=new ViewHolder();
            convertView = View.inflate(context, R.layout.list_item, null);
            final ImageView iv=(ImageView) convertView.findViewById(R.id.iv);
            TextView tv=(TextView)convertView.findViewById(R.id.tv);
            vh.vh_iv=iv;
            vh.vh_tv=tv;
            convertView.setTag(vh);
        }else {
            vh=(ViewHolder) convertView.getTag();
        }

        vh.vh_tv.setText(list.get(position).get("title"));
        Picasso.with(context).load(list.get(position).get("img")).transform(new CropCircleTransformation()).into(vh.vh_iv);

        return convertView;
    }

    class ViewHolder{
        ImageView vh_iv;
        TextView vh_tv;
    }
}

实体类很简单，alt+ins 

public class Food
{
    /**
     * ret : 1
     * data : [{"id":"8289","title":"油焖大虾","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.jpg","collect_num":"1639","food_str":"大虾 葱 生姜 植物油 料酒","num":1639},{"id":"2127","title":"四川回锅肉","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2127.jpg","collect_num":"1578","food_str":"猪肉 青蒜 青椒 红椒 姜片","num":1578},{"id":"30630","title":"超简单芒果布丁","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/31/30630.jpg","collect_num":"1507","food_str":"QQ糖 牛奶 芒果","num":1507},{"id":"9073","title":"家常红烧鱼","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9073.jpg","collect_num":"1411","food_str":"鲜鱼 姜 葱 蒜 花椒","num":1411},{"id":"10097","title":"家常煎豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10097.jpg","collect_num":"1396","food_str":"豆腐 新鲜红椒 青椒 葱花 油","num":1396},{"id":"10509","title":"水煮肉片","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10509.jpg","collect_num":"1329","food_str":"瘦猪肉 生菜 豆瓣酱 干辣椒 花椒","num":1329},{"id":"46968","title":"红糖苹果银耳汤","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/47/46968.jpg","collect_num":"1238","food_str":"银耳 苹果 红糖","num":1238},{"id":"10191","title":"麻婆豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10191.jpg","collect_num":"1205","food_str":"豆腐 肉末 生抽 白糖 芝麻油","num":1205},{"id":"2372","title":"皮蛋瘦肉粥","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2372.jpg","collect_num":"1136","food_str":"大米 皮蛋 猪肉 油条 香葱","num":1136},{"id":"2166","title":"蚂蚁上树","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2166.jpg","collect_num":"1130","food_str":"红薯粉 肉 姜 蒜 花椒","num":1130},{"id":"2262","title":"糖醋肉","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2262.jpg","collect_num":"1064","food_str":"猪肉 红椒 黄椒 洋葱 蛋清","num":1064},{"id":"9971","title":"鱼香豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9971.jpg","collect_num":"996","food_str":"豆腐 木耳 胡萝卜 香葱 番茄酱","num":996},{"id":"10172","title":"干煸四季豆","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10172.jpg","collect_num":"985","food_str":"四季豆 干辣椒 蒜头 酱油 糖","num":985},{"id":"2685","title":"胡萝卜肉末蒸蛋","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2685.jpg","collect_num":"902","food_str":"胡萝卜 肉 蛋 生抽 盐","num":902},{"id":"9972","title":"虎皮青椒","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9972.jpg","collect_num":"883","food_str":"青辣椒 大蒜 香醋 白糖 生抽","num":883},{"id":"10437","title":"叉烧排骨","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10437.jpg","collect_num":"791","food_str":"排骨 李锦记叉烧酱 植物油 清水 油菜","num":791},{"id":"2892","title":"\u201c五行\u201d彩蔬汤","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2892.jpg","collect_num":"751","food_str":"黑木耳 玉米 牛蒡 胡萝卜 西兰花","num":751},{"id":"2348","title":"麻辣肉丝面","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2348.jpg","collect_num":"748","food_str":"面条 肉丝 淀粉 酱油 辣椒","num":748},{"id":"10044","title":"土豆炖翅根","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10044.jpg","collect_num":"745","food_str":"土豆 翅根 葱 姜 料酒","num":745},{"id":"33783","title":"美人豆浆","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/34/33783.jpg","collect_num":"744","food_str":"黄豆 红豆 绿豆 黑豆 黑米","num":744}]
     */

    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;
    }

    public static class DataBean implements Serializable{
        /**
         * id : 8289
         * title : 油焖大虾
         * pic : http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.jpg
         * collect_num : 1639
         * food_str : 大虾 葱 生姜 植物油 料酒
         * num : 1639
         */

        private String id;
        private String title;
        private String pic;
        private String collect_num;
        private String food_str;
        private int num;

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public String getPic() {
            return pic;
        }

        public void setPic(String pic) {
            this.pic = pic;
        }

        public String getCollect_num() {
            return collect_num;
        }

        public void setCollect_num(String collect_num) {
            this.collect_num = collect_num;
        }

        public String getFood_str() {
            return food_str;
        }

        public void setFood_str(String food_str) {
            this.food_str = food_str;
        }

        public int getNum() {
            return num;
        }

        public void setNum(int num) {
            this.num = num;
        }
    }
}

异步任务类，主要任务是从网络获取数据 

public class MyAsyncTask extends AsyncTask<String,Void,String> {
    //Context context;
    CallBack callBack;
    public MyAsyncTask(CallBack callBack){
        //this.context=context;
        this.callBack=callBack;
    }

    @Override
    protected String doInBackground(String... params) {
        try {
            URL url=new URL(params[0]);
            HttpURLConnection huc=(HttpURLConnection) url.openConnection();
            huc.setConnectTimeout(3000);
            huc.connect();
            if(huc.getResponseCode()==200){
                InputStream inputStream = huc.getInputStream();
                byte[] b=new byte[1024];
                int len=0;
                StringBuilder sb=new StringBuilder();
                while ((len=inputStream.read(b))!=-1){
                    sb.append(new String(b,0,len));
                }
                return sb.toString();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        callBack.sendResult(s);
    }

    interface CallBack{
        void sendResult(String json);
    }
}

通过picasso获取网络数据并处理 

public class Main2Activity extends AppCompatActivity {
    private ImageView iv;
    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        iv=(ImageView)findViewById(R.id.iv);
        tv=(TextView)findViewById(R.id.tv);
        Intent intent = getIntent();
        Food.DataBean bean=(Food.DataBean) intent.getSerializableExtra("bean");
        String title = bean.getTitle();
        String pic = bean.getPic();
        tv.setText(title);
        Picasso.with(this).load(pic).into(iv);

    }
}
MainActivity布局 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">

    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</RelativeLayout>
Main2Activity布局 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.dazonghe.Main2Activity">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="100dp"
        android:layout_height="100dp" />
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>
list_item布局 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="80dp"
        android:layout_height="80dp" />
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:gravity="center_vertical"/>
</LinearLayout>






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