去年我做了一个 android 应用程序，它运行良好，我被重新分配开发应用程序。
但是用户的注册已经停止工作。原因，我一点头绪都没有。
这是我的开始屏幕，用户注册的活动：
public class Prompt extends Activity {
public EditText u, p, e;
public String username, password, emailadd;
public Button createClient;
final Context context = this;
public TextView registerErrorMsg;
// JSON Response node names
private static String KEY_SUCCESS = "success";
@SuppressWarnings("unused")
private static String KEY_ERROR = "error";
@SuppressWarnings("unused")
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.prompt);
// Importing all assets like buttons, text fields
u = (EditText) findViewById(R.id.username);
p = (EditText) findViewById(R.id.Password);
e = (EditText) findViewById(R.id.emailAddress);
createClient = (Button) findViewById(R.id.createClient);
registerErrorMsg = (TextView) findViewById(R.id.register_error);
u.setText("usernametest");
p.setText("passwordtest");
e.setText("TEST@gmail.com");
//Toast.makeText(getApplicationContext(), "...", Toast.LENGTH_LONG).show();
createClient.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
username = u.getText().toString();
password = p.getText().toString();
emailadd = e.getText().toString();
UserFunctions userFunction = new UserFunctions();
//Toast.makeText(getApplicationContext(), username+" "+password+" "+emailadd, Toast.LENGTH_LONG).show();
//now we have text input, validate them
if(username.length() < 5 || password.length() < 5 || emailadd.length() < 5){
//minimum input for each field is > 5 characters
registerErrorMsg.setText("Username, password and email must have must than 5 characters");
}
else{
//if validated correctly upload
JSONObject json = userFunction.registerUser(username, emailadd, password);
Log.e("JSON RESULT", "JSON result: " + json);
//successfully make the check file and redirect to the homepage
try {
String FILE_NAME = "filename.txt";
FileOutputStream fos = openFileOutput(FILE_NAME, Context.MODE_WORLD_READABLE);
try{
fos.write(username.getBytes());
}catch (IOException e){
e.printStackTrace();
}
fos.close();
//if all complete, redirect to home page
Intent intent2 = new Intent(Prompt.this, StrategicEnergyActivity.class);
intent2.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent2);
finish();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
});
}
}
这是我的 JSON Parser 类，用于处理从 Web 服务返回的 JSON：
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {
Log.e("TESTTTT", " " + params.get(0) + " " + params.get(1) + " " + params.get(2) + " " + params.get(3));
// Making HTTP request
try {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");
httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
is.close();
json = sb.toString();
Log.e("JSON", json);
}
catch (Exception e){
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try{
jObj = new JSONObject(json);
}
catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
这是我的用户函数类，该类执行数据处理/方法调用：
public class UserFunctions {
private JSONParser jsonParser;
private static String registerURL = "http://www.website.com/api/index.php?";
private static String register_tag = "register";
// constructor
public UserFunctions(){
jsonParser = new JSONParser();
}
/**
* function make Login Request
* @param name
* @param email
* @param password
* */
public JSONObject registerUser(String name, String email, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", register_tag));
params.add(new BasicNameValuePair("name", name));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
Log.e("Credentials", "Username: " + name + "\nEmail: " + email + "\nPassword: " + password);
//Toast.makeText(getParent(), name+" "+email+" "+password, Toast.LENGTH_LONG).show();
JSONObject json = jsonParser.getJSONFromUrl(registerURL, params);
return json;
}
}
这是我的网络服务上的代码：
<?php
print_r($_POST);
$tag = "register";
// include db handler
require_once 'include/DB_Functions.php';
$db = new DB_Functions();
// response Array
$response = array("tag" => $tag, "success" => 0, "error" => 0);
// check for tag type
if ($tag == 'register') {
// Request type is Register new user
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
// check if user is already existed
if($db->isUserExisted($email)){
// user is already exists - error response
$response["error"] = 2;
$response["error_msg"] = "User Already Exists";
echo json_encode($response). "User Already Exists";
}
else{
// store user
$user = $db->storeUser($name, $email, $password);
if($user){
// user stored successfully
$response["success"] = 1;
$response["uid"] = $user["unique_id"];
$response["user"]["name"] = $user["name"];
$response["user"]["email"] = $user["email"];
$response["user"]["created_at"] = $user["created_at"];
$response["user"]["updated_at"] = $user["updated_at"];
echo json_encode($response). "User Stored Successfully";
}
else{
// user failed to store
$response["error"] = 1;
$response["error_msg"] = "Error occured in Registration";
echo json_encode($response);
}
}
}
else{
echo "Invalid Request";
}
?>
最后，这是当前向我抛出的错误，它发生在 JSONParser 类的 sb.append(line) 行中：
05-21 16:35:46.304: E/Buffer Error(4278): Error converting result java.lang.NullPointerException
05-21 16:35:46.308: E/JSON Parser(4278): Error parsing data org.json.JSONException: End of input at character 0 of
05-21 16:35:46.308: E/JSON RESULT(4278): JSON result: null
谁能发现我在这里做错了什么？我真的很感激任何帮助。
提前致谢！