Android——登陆界面的异步实现

来源：互联网发布：大数据 hadoop 配置编辑：程序博客网时间：2024/06/05 10:51
public class MainActivity extends BaseActivity {    private String path;    String userText;    String passText;    @InjectView(R.id.login_btn) Button login_btn;    @InjectView(R.id.ft_username) EditText ft_username;    @InjectView(R.id.ft_password) EditText ft_password;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//         登陆        login_btn.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                userText = ft_username.getText().toString().trim();                passText = ft_password.getText().toString().trim();                new LoginTask(MainActivity.this, userText, passText).execute();            }        });    }    class LoginTask extends AsyncTask<Void, String, Boolean> {        private Context context;        private String userText;        private String passText;        public LoginTask(Context context, String userText, String passText) {            this.context = context;            this.userText = userText;            this.passText = passText;        }        /**         * 运行在UI线程中，在调用doInBackground()之前执行         */        @Override        protected void onPreExecute() {            path = "http://106.120.172.113:8080/ftyy/login/loginAction!applogin.dhtml?userName=" + userText + "&password=" + passText;        }        /**         * 后台运行的方法，可以运行非UI线程，可以执行耗时的方法         */        @Override        protected Boolean doInBackground(Void... params) {            Map<String, String> map = new HashMap<String, String>();            // 通过HttpUrlConnection发送GET请求            try {                URL url = new URL(path);                HttpURLConnection conn = (HttpURLConnection) url.openConnection();                conn.setConnectTimeout(5000);                conn.setRequestMethod("GET");                int code = conn.getResponseCode();                if (code == 200) {                    InputStream is = conn.getInputStream();                    String msg = streamToString(is);                    map = parseJsonStr(msg);                    Boolean status = map.get("msg").equals("登录成功");                   // Toast.makeText(MainActivity.this, "insert success", Toast.LENGTH_LONG).show();                    return status;                }else{                    return false;                }            } catch (Exception e) {                e.printStackTrace();                return false;            }        }        /**         * 运行在ui线程中，在doInBackground()执行完毕后执行         */        @Override        protected void onPostExecute(Boolean flag) {            if (flag) {                Toast.makeText(MainActivity.this, "登陆成功", Toast.LENGTH_SHORT).show();                //跳转到主界面                Intent intent = new Intent(MainActivity.this, MainUI.class);                context.startActivity(intent);            } else {                Toast.makeText(MainActivity.this, "登陆失败，请重新登陆", Toast.LENGTH_SHORT).show();            }        }        public String streamToString(InputStream is) {            ByteArrayOutputStream baos = null;            try {                baos = new ByteArrayOutputStream();//此类实现了一个输出流，其中的数据被写入一个 byte 数组。                byte[] buffer = new byte[1024];                int len = 0;                while ((len = is.read(buffer)) != -1) {                    baos.write(buffer, 0, len);                }                byte[] byteArray = baos.toByteArray();//创建一个新分配的byte数组                return new String(byteArray);            } catch (Exception e) {                return null;            }finally {                if(baos==null){                    try {                        baos.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }                if(is==null){                    try {                        is.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }        public Map<String, String> parseJsonStr(String jsonStr) {            return JSON.parseObject(jsonStr, new TypeReference<Map<String, String>>() {                    });        }    }}
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