ListView获取网络数据并展示优化练习
权限:
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
依赖:
compile 'com.google.code.gson:gson:2.8.2'
MainActivity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="com.mrzhao.examdemo.MainActivity"> <Button
android:id="@+id/getData_bt" android:onClick="onClick" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp" android:text="点击获取网络数据" tools:ignore="OnClick" /> <Button android:id="@+id/toSecond_bt" android:onClick="onClick" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp"android:text="跳转到第二个页面" tools:ignore="OnClick" /> </LinearLayout>
MainActivity代码:
public class MainActivity extends AppCompatActivity { private String path = "http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=1"; private FoodEntity foodEntity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void onClick(View view) { switch (view.getId()) { case R.id.getData_bt: new MyTask().execute(); break; case R.id.toSecond_bt: if (foodEntity!=null){ Intent intent = new Intent(this,SecondActivity.class); intent.putExtra("food",foodEntity); startActivity(intent); } break; } } class MyTask extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... strings) { return getDataFromNet(); } @Override protected void onPostExecute(String s) { super.onPostExecute(s); //判断不是空就去解析 if (!TextUtils.isEmpty(s)) { Gson gson = new Gson(); foodEntity= gson.fromJson(s, FoodEntity.class); } } } /** * 网络获取数据 * * @return */ private String getDataFromNet() { 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(www.fengshen157.com); } 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; }}
SecondActivity布局:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://www.fengshen157.com schemas.android.com/apk/res/android" xmlns:app="http://www.huarenyl.cn schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.mrzhao.examdemo.SecondActivity"> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="match_parent"></ListView> </LinearLayout>
SecondActivity代码:
public class SecondActivity extends AppCompatActivity { private ListView listView; private MyAdapter myAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); //获取传递过来的解析对象 FoodEntity foodEntity = (FoodEntity) getIntent().getSerializableExtra("food"); final List<FoodEntity.DataBean> data = foodEntity.getData(); //实例化视图 listView = www.006665.cn (ListView) findViewById(R.id.listView); myAdapter = new MyAdapter(data, this); listView.setAdapter(myAdapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(SecondActivity.this, www.huayi157.com/ data.get(position).getTitle(), Toast.LENGTH_SHORT).show(); } }); } }
Item条目布局:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_www.baohuayule.com width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/title_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" android:textSize="20sp"www.baohuayule.cn /> </LinearLayout>
适配器:
public class MyAdapter extends BaseAdapter { private List<FoodEntity.DataBean> list; private Context context; private LayoutInflater www.thylgw.cn/ inflater; public MyAdapter(List<FoodEntity.DataBean> list, Context context) { this.list = list; this.context = context; 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.titleTv = (TextView) convertView.findViewById(R.id.title_tv); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } String title = list.get(position).getTitle(); holder.titleTv.setText(title); return convertView; } static class ViewHolder { TextView titleTv; } }
解析实体类:
public class FoodEntity implements Serializable{ /** * ret : 1 * data : [{"id":"8289","title":"油焖大虾","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.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":"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":"1529","food_str":"QQ糖 牛奶 芒果","num":1529},{"id":"9073","title":"家常红烧鱼","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9073.jpg","collect_num":"1419","food_str":"鲜鱼 姜 葱 蒜 花椒","num":1419},{"id":"10097","title":"家常煎豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10097.jpg","collect_num":"1406","food_str":"豆腐 新鲜红椒 青椒 葱花 油","num":1406},{"id":"10509","title":"水煮肉片","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10509.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/47/46968.jpg","collect_num":"1245","food_str":"银耳 苹果 红糖","num":1245},{"id":"10191","title":"麻婆豆腐","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10191.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2372.jpg","collect_num":"1147","food_str":"大米 皮蛋 猪肉 油条 香葱","num":1147},{"id":"2166","title":"蚂蚁上树","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2166.jpg","collect_num":"1140","food_str":"红薯粉 肉 姜 蒜 花椒","num":1140},{"id":"2262","title":"糖醋肉","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2262.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9971.jpg","collect_num":"1004","food_str":"豆腐 木耳 胡萝卜 香葱 番茄酱","num":1004},{"id":"10172","title":"干煸四季豆","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10172.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2685.jpg","collect_num":"918","food_str":"胡萝卜 肉 蛋 生抽 盐","num":918},{"id":"9972","title":"虎皮青椒","pic":"http://www.qubaobei.com/ios/cf/uploadfile/132/10/9972.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10437.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2892.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/34/33783.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/3/2348.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":"http://www.qubaobei.com/ios/cf/uploadfile/132/11/10044.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 implements Serializable{ /** * id : 8289 * title : 油焖大虾 * pic : http://www.qubaobei.com/ios/cf/uploadfile/132/9/8289.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; }
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