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网络获取数据列表下拉刷新上拉加载更多练习
第一步首先导入PullToRefresh的包Library
布局文件：
item_layout.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageView
android:id="@+id/food_iv"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_margin="20dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/food_name_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20sp"
android:textSize="20sp" />
<TextView
android:id="@+id/food_str_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20sp"
android:textSize="20sp" />
</LinearLayout>
</LinearLayout>
main_layout.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
xmlns:app=""
xmlns:tools=""
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.mrzhao.qbbdemo.MainActivity">
<com.handmark.pulltorefresh.library.PullToRefreshListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"></com.handmark.pulltorefresh.library.PullToRefreshListView>
</LinearLayout>
FoodEntity:
public class FoodEntity {/**
* ret : 1
* data : [{"id":"8289","title":"油焖大虾","pic":".jpg","collect_num":"1659","food_str":"大虾 葱 生姜 植物油 料酒","num":1659},{"id":"2127","title":"四川回锅肉","pic":".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":".jpg","collect_num":"1527","food_str":"QQ糖 牛奶 芒果","num":1527},{"id":"9073","title":"家常红烧鱼","pic":".jpg","collect_num":"1418","food_str":"鲜鱼 姜 葱 蒜 花椒","num":1418},{"id":"10097","title":"家常煎豆腐","pic":".jpg","collect_num":"1405","food_str":"豆腐 新鲜红椒 青椒 葱花 油","num":1405},{"id":"10509","title":"水煮肉片","pic":".jpg","collect_num":"1336","food_str":"瘦猪肉 生菜 豆瓣酱 干辣椒 花椒","num":1336},{"id":"46968","title":"红糖苹果银耳汤","pic":".jpg","collect_num":"1245","food_str":"银耳 苹果 红糖","num":1245},{"id":"10191","title":"麻婆豆腐","pic":".jpg","collect_num":"1214","food_str":"豆腐 肉末 生抽 白糖 芝麻油","num":1214},{"id":"2372","title":"皮蛋瘦肉粥","pic":".jpg","collect_num":"1145","food_str":"大米 皮蛋 猪肉 油条 香葱","num":1145},{"id":"2166","title":"蚂蚁上树","pic":".jpg","collect_num":"1140","food_str":"红薯粉 肉 姜 蒜 花椒","num":1140},{"id":"2262","title":"糖醋肉","pic":".jpg","collect_num":"1074","food_str":"猪肉 红椒 黄椒 洋葱 蛋清","num":1074},{"id":"9971","title":"鱼香豆腐","pic":".jpg","collect_num":"1003","food_str":"豆腐 木耳 胡萝卜 香葱 番茄酱","num":1003},{"id":"10172","title":"干煸四季豆","pic":".jpg","collect_num":"988","food_str":"四季豆 干辣椒 蒜头 酱油 糖","num":988},{"id":"2685","title":"胡萝卜肉末蒸蛋","pic":".jpg","collect_num":"916","food_str":"胡萝卜 肉 蛋 生抽 盐","num":916},{"id":"9972","title":"虎皮青椒","pic":".jpg","collect_num":"889","food_str":"青辣椒 大蒜 香醋 白糖 生抽","num":889},{"id":"10437","title":"叉烧排骨","pic":".jpg","collect_num":"797","food_str":"排骨 李锦记叉烧酱 植物油 清水 油菜","num":797},{"id":"2892","title":"\u201c五行\u201d彩蔬汤","pic":".jpg","collect_num":"756","food_str":"黑木耳 玉米 牛蒡 胡萝卜 西兰花","num":756},{"id":"33783","title":"美人豆浆","pic":".jpg","collect_num":"753","food_str":"黄豆 红豆 绿豆 黑豆 黑米","num":753},{"id":"2348","title":"麻辣肉丝面","pic":".jpg","collect_num":"753","food_str":"面条 肉丝 淀粉 酱油 辣椒","num":753},{"id":"10044","title":"土豆炖翅根","pic":".jpg","collect_num":"752","food_str":"土豆 翅根 葱 姜 料酒","num":752}]
*/
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 {/**
* id : 8289
* title : 油焖大虾
* pic : .jpg
* collect_num : 1659
* food_str : 大虾 葱 生姜 植物油 料酒
* num : 1659
*/
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;
}}
}
适配器MyAdapter:
public class MyAdapter extends BaseAdapter {private List<FoodEntity.DataBean> list;
private Context context;
private LayoutInflater inflater;
public MyAdapter(List<FoodEntity.DataBean> list, Context context) {this.list = list;
this.context = context;
//初始化布局加载器
inflater = LayoutInflater.from(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) {ViewHolder holder = null;
if (convertView == null) {convertView = inflater.inflate(R.layout.item_layout, parent, false);
holder = new ViewHolder();
holder.foodPicIv = (ImageView) convertView.findViewById(R.id.food_iv);
holder.foodNameTv = (TextView) convertView.findViewById(R.id.food_name_tv);
holder.foodStrTv = (TextView) convertView.findViewById(R.id.food_str_tv);
convertView.setTag(holder);
} else {holder = (ViewHolder) convertView.getTag();
}FoodEntity.DataBean dataBean = list.get(position);
holder.foodNameTv.setText(dataBean.getTitle());
holder.foodStrTv.setText(dataBean.getFood_str());
//显示图片
Picasso.with(context).load(dataBean.getPic()).into(holder.foodPicIv);
return convertView;
}static class ViewHolder {ImageView foodPicIv;
TextView foodNameTv;
TextView foodStrTv;
}
}
MainActivity:
public class MainActivity extends AppCompatActivity {private PullToRefreshListView listView;
//想要访问的网络路径
private String path = "";
//定义数据源
private List<FoodEntity.DataBean> list = new ArrayList<>();
private MyAdapter myAdapter;
//定义一个页码
private int pager = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (PullToRefreshListView) findViewById(R.id.listView);
//设置支持下拉刷新及上拉加载更多
listView.setMode(PullToRefreshBase.Mode.BOTH);
//创建一个适配器
myAdapter = new MyAdapter(list, this);
//设置适配器
listView.setAdapter(myAdapter);
//添加条目点击事件
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {//点击的条目的对应数据实体
FoodEntity.DataBean dataBean = list.get(position - 1);
Toast.makeText(MainActivity.this, dataBean.getTitle(), Toast.LENGTH_SHORT).show();
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("食物信息");
//初始化自定义的View
View dialogView = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_layout, null);
//实例化每个字视图
ImageView foodIv = (ImageView) dialogView.findViewById(R.id.food_iv);
TextView foodNameTv = (TextView) dialogView.findViewById(R.id.food_name_tv);
TextView foodStrTv = (TextView) dialogView.findViewById(R.id.food_str_tv);
//设置字视图应该展示的内容
Picasso.with(MainActivity.this).load(dataBean.getPic()).into(foodIv);
foodNameTv.setText(dataBean.getTitle());
foodStrTv.setText(dataBean.getFood_str());
//设置视图
builder.setView(dialogView);
//展示视图
builder.show();
}});
listView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {@Override
public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {//下拉刷新执行
pager = 1;
//清空原来的数据
list.clear();
//执行下载
new MyTask().execute();
}@Override
public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {//上拉加载更多执行
pager++;
//执行下载
new MyTask().execute();
}});
//获取路径
getPathFromAssets();
//开启下载
new MyTask().execute();
}/**
* 获取网络数据的异步任务
*/
class MyTask extends AsyncTask<Void, Void, String> {@Override
protected String doInBackground(Void... params) {return getJSONFromNet(path + pager);
}@Override
protected void onPostExecute(String s) {super.onPostExecute(s);
//刷新完成
listView.onRefreshComplete();
if (!TextUtils.isEmpty(s)) {Gson gson = new Gson();
FoodEntity foodEntity = gson.fromJson(s, FoodEntity.class);
//获取数据中的集合
List<FoodEntity.DataBean> data = foodEntity.getData();
if (data != null && data.size() > 0) {//更新UI
list.addAll(data);
//数据源更新后刷新适配器
myAdapter.notifyDataSetChanged();
}}}}/**
* 网络获取json数据工具类
*
* @param path
* @return
*/
public String getJSONFromNet(String path) {InputStream inputStream = null;
ByteArrayOutputStream outputStream = null;
try {URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(30 * 1000);
conn.setReadTimeout(30 * 1000);
conn.connect();
if (conn.getResponseCode() == 200) {inputStream = conn.getInputStream();
outputStream = new ByteArrayOutputStream();
int len = 0;
byte[] bytes = new byte[1024];
while ((len = inputStream.read(bytes)) != -1) {outputStream.write(bytes, 0, len);
}return outputStream.toString();
}} catch (MalformedURLException e) {e.printStackTrace();
} catch (ProtocolException e) {e.printStackTrace();
} catch (IOException e) {e.printStackTrace();
} finally {if (inputStream != null) {try {inputStream.close();
} catch (IOException e) {e.printStackTrace();
}}if (outputStream != null) {try {outputStream.close();
} catch (IOException e) {e.printStackTrace();
}}}return null;
}/**
* 从Assets里获取 想要访问的路径
*/
private void getPathFromAssets() {try {//获取内容的流
InputStream inputStream = getAssets().open("path.txt");
byte[] bytes = new byte[inputStream.available()];
inputStream.read(bytes);
ByteArrayOutputStream opt = new ByteArrayOutputStream();
opt.write(bytes, 0, bytes.length);
//拿到最终的结果
path = opt.toString();
} catch (IOException e) {e.printStackTrace();
}}
}
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