Android中異步任務請求網絡數據

public class MainActivity extends AppCompatActivity {

    private TextView text_title;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //獲取控件
        text_title = (TextView) findViewById(R.id.text_title);

        Mytask mytask = new Mytask();
        mytask.execute();
    }
    class Mytask extends AsyncTask<Void,Void,String>{

        @Override
        protected String doInBackground(Void... voids) {

            try {
                //創建httpclient對象
                DefaultHttpClient client = new DefaultHttpClient();
                //路徑
                String path = "http://apis.juhe.cn/cook/query?key=?&menu=%E8%A5%BF%E7%BA%A2%E6%9F%BF&rn=10&pn=3";
                //創建請求方式
                HttpGet httpGet = new HttpGet(path);
                //用對象執行
                HttpResponse execute = client.execute(httpGet);
                //獲取狀態碼,要先獲取狀態行
                int statusCode = execute.getStatusLine().getStatusCode();
                if (statusCode == 200) {
                    //獲取實體內容
                    InputStream content = execute.getEntity().getContent();
                    //把實體內容轉爲字符串
                    InputStreamReader inputStreamReader = new InputStreamReader(content);
                    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                    //創建字符串緩衝區
                    StringBuilder builder = new StringBuilder();
                    //創建變量,用來存儲讀取的內容
                    String string = null;
                    //循環讀取內容
                    while ((string = bufferedReader.readLine()) != null) {
                        builder.append(string);
                    }
                    bufferedReader.close();
                    return builder.toString();
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

            return null;
        }
        //此方法接收doinbackground方法的返回值
        @Override
        protected void onPostExecute(String s) {
            text_title.setText(s);
        }

    }
}