gson解析菜譜大全把資料放到Listview中
阿新 • • 發佈:2018-12-18
XML中的程式碼:
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content"></ListView>
Activity中的程式碼:
private Mybase mybase; private final int UPDATE_UI=1; private String lujing="http://apis.juhe.cn/cook/query?key=9e7b4454a8f999479620c28f4624de83&menu=%E8%A5%BF%E7%BA%A2%E6%9F%BF&rn=30&pn=3"; private ListView listView; @SuppressLint("HandlerLeak") private Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { //把解出來的資料給了介面卡中的集合 List<Bean.Data> datas= (List<Bean.Data>) msg.obj; mybase.setList(datas); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //獲取資源ID listView = findViewById(R.id.listview); //判斷網路是否可用 if (!keyong()){ Toast.makeText(this, "網路不可用", Toast.LENGTH_SHORT).show(); return ; } mybase=new Mybase(this); listView.setAdapter(mybase); new Thread( new Runnable() { @Override public void run() { huoqu(); } } ).start(); } private boolean keyong(){ //獲取網路狀態連線服務 ConnectivityManager cm= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); //獲取網路狀態許可權 NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo(); return activeNetworkInfo!=null&&activeNetworkInfo.isAvailable(); } //網路請求 private void huoqu(){ try { //定義url地址 URL url=new URL(lujing); //開啟連線 HttpURLConnection urlConnection= (HttpURLConnection) url.openConnection(); //請求方法 urlConnection.setRequestMethod("GET"); //讀取超時 urlConnection.setReadTimeout(5000); //連線超時 urlConnection.setConnectTimeout(5000); int responseCode = urlConnection.getResponseCode(); if (responseCode==200) { String result = zifu(urlConnection.getInputStream()); Bean bean = new Gson().fromJson(result, Bean.class); handler.sendMessage(handler.obtainMessage(UPDATE_UI,bean.getResult().getData())); } } catch (Exception e) { e.printStackTrace(); } } //位元組流轉化成字元流 private String zifu(InputStream zijie) throws IOException { InputStreamReader inputStreamReader=new InputStreamReader(zijie); BufferedReader buff=new BufferedReader(inputStreamReader); StringBuilder builder=new StringBuilder(); for (String imp=buff.readLine();imp!=null;imp=buff.readLine()){ builder.append(imp); } return builder.toString(); }
介面卡中的程式碼:
private List<Bean.Data> list; private Context context; public Mybase(Context context) { this.context = context; list=new ArrayList<>(); } public void setList(List<Bean.Data> list) { this.list = list; notifyDataSetChanged(); } @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; if (convertView==null){ holder=new ViewHolder(); convertView=LayoutInflater.from(context).inflate(R.layout.list,parent,false ); holder.text=convertView.findViewById(R.id.text); holder.image=convertView.findViewById(R.id.image); convertView.setTag(holder); }else{ holder= (ViewHolder) convertView.getTag(); } holder.text.setText(list.get(position).getTitle()); return convertView; } class ViewHolder{ private ImageView image; private TextView text; }
解析使用的Bean類:
public Result result; public void setResult(Result result) { this.result = result; } public Result getResult() { return result; } class Result{ public List<Data> data; public void setData(List<Data> data) { this.data = data; } public List<Data> getData() { return data; } } class Data{ public String id; public String title; public void setId(String id) { this.id = id; } public void setTitle(String title) { this.title = title; } public String getId() { return id; } public String getTitle() { return title; } }