[Android] AsyncTask的使用

    /**     * Represents an asynchronous login/registration task used to authenticate     * the user.     */    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {        private final String mEmail;        private final String mPassword;        public int login_ret = 0;        UserLoginTask(String email, String password) {            mEmail = email;            mPassword = password;        }        @Override        protected Boolean doInBackground(Void... params) {            // TODO: attempt authentication against a network service.            login_ret = GBase.userLogin(mEmail,mPassword);            return  true;        }        @Override        protected void onPostExecute(final Boolean success) {            mAuthTask = null;            showProgress(false);            switch (login_ret){                case 0:                    startActivity(new Intent(LoginActivity.this,MainActivity.class));                    finish();                    break;                case -1:                    mEmailView.setError(getString(R.string.error_invalid_email));                    mEmailView.requestFocus();                    break;                case -2:                    mPasswordView.setError(getString(R.string.error_incorrect_password));                    mPasswordView.requestFocus();                    break;                case -3:                    break;                default:break;            }        }        @Override        protected void onCancelled() {            mAuthTask = null;            showProgress(false);        }    }

负责后台处理的任务：
Boolean doInBackground(Void… params)；
当后台任务处理完成后，会执行：
onPostExecute(final Boolean success)；
其中Boolean doInBackground(Void… params)的返回值作为onPostExecute(final Boolean success)的输入参数。
执行代码：

    private UserLoginTask mAuthTask = null;    mAuthTask = new UserLoginTask(email, password);    //执行该任务    mAuthTask.execute((Void) null);    //取消该任务    //mAuthTask.cancel(true);

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