我正在开发，我想要显示用户注册。以下是我的代码，它在Logcat中显示正确的响应，但没有在app端显示消息（即注册成功或注册失败消息）。我正在尝试解析响应，但 logcat 显示消息是＆＃ 34; org.json.JSONException：没有响应类型的值＆＃34;
我如何在此解析json数据？请建议我!!
我按照建议做了改变！
我还有什么需要做的？
//以下是来自Logcat
内的服务器显示的响应{"signup":[
{"sessionid":0,
"responsetype":"failure",
"message":"Username emailid already register."
}
]
}
// Following is my code
public class RegisterActivity extends AppCompatActivity implements View.OnClickListener {
private EditText editTextfName;
private EditText editTextlName, editTextDid, editTextBd;
private EditText editTextPassword;
private EditText editTextEmail;
TextView txtBirthDate;
private Button buttonRegister;
Button buttonBdate;
String selected_date="";
int mYear, mMonth, mDay;
Calendar myCalendar;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
editTextfName = (EditText) findViewById(R.id.editTextfName);
editTextlName = (EditText) findViewById(R.id.editTextlName);
// editTextDid = (EditText) findViewById(R.id.editTextdid);
editTextBd = (EditText) findViewById(R.id.editTextbdate);
// txtBirthDate = (TextView) findViewById(R.id.txtBdate);
editTextPassword = (EditText) findViewById(R.id.editTextPassword);
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
buttonRegister = (Button) findViewById(R.id.buttonRegister);
buttonRegister.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if(v.getId() == R.id.buttonRegister){
// Get the values given in EditText fields
String firstname = editTextfName.getText().toString();
String lastname = null;
String emailaddress = editTextEmail.getText().toString();
String birthdate = null;
String password = editTextPassword.getText().toString();
String deviceid = null;
System.out.println("Givennames is :" + firstname + " Given password is :" + password);
// Pass those values to connectWithHttpGet() method
connectWithHttpGet(firstname,lastname,emailaddress,birthdate,password,deviceid);
}
}
private void connectWithHttpGet(String firstname, String lastname, String emailaddress, String birthdate, String password, String deviceid) {
// Connect with a server is a time consuming process.
//Therefore we use AsyncTask to handle it
// From the three generic types;
//First type relate with the argument send in execute()
//Second type relate with onProgressUpdate method which I haven't use in this code
//Third type relate with the return type of the doInBackground method, which also the input type of the onPostExecute method
class HttpGetAsyncTask extends AsyncTask<String, Void, String> {
private Context context;
private HttpGetAsyncTask(Context context){
this.context=context;
}
@Override
protected String doInBackground(String... params) {
// As you can see, doInBackground has taken an Array of Strings as the argument
//We need to specifically get the givenUsername and givenPassword
String paramFname = params[0];
String paramLname = params[1];
String paramEmail = params[2];
String paramBirthdate = params[3];
String paramPassword = params[4];
String paramDeviceid = params[5];
System.out.println("userID" + paramFname + " password is :" + paramPassword);
// Create an intermediate to connect with the Internet
HttpClient httpClient = new DefaultHttpClient();
// Sending a GET request to the web page that we want
// Because of we are sending a GET request, we have to pass the values through the URL
HttpGet httpGet = new HttpGet("http://www.example.com/ypAndroid/api/signUp?firstname="+paramFname+"&lastname="+paramLname+"&emailid="+paramEmail+"&birthdate="+paramBirthdate+"&password="+paramPassword+"&deviceid="+null);
try {
// execute(); executes a request using the default context.
// Then we assign the execution result to HttpResponse
HttpResponse httpResponse = httpClient.execute(httpGet);
System.out.println("httpResponse// getEntity() ; obtains the message entity of this response");
// getContent() ; creates a new InputStream object of the entity.
// Now we need a readable source to read the byte stream that comes as the httpResponse
InputStream inputStream = httpResponse.getEntity().getContent();
// We have a byte stream. Next step is to convert it to a Character stream
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
// Then we have to wraps the existing reader (InputStreamReader) and buffer the input
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
// InputStreamReader contains a buffer of bytes read from the source stream and converts these into characters as needed.
//The buffer size is 8K
//Therefore we need a mechanism to append the separately coming chunks in to one String element
// We have to use a class that can handle modifiable sequence of characters for use in creating String
StringBuilder stringBuilder = new StringBuilder();
String bufferedStrChunk = null;
// There may be so many buffered chunks. We have to go through each and every chunk of characters
//and assign a each chunk to bufferedStrChunk String variable
//and append that value one by one to the stringBuilder
while((bufferedStrChunk = bufferedReader.readLine()) != null){
stringBuilder.append(bufferedStrChunk);
}
// Now we have the whole response as a String value.
//We return that value then the onPostExecute() can handle the content
System.out.println("Returninge of doInBackground :" + stringBuilder.toString());
// If the Username and Password match, it will return "working" as response
// If the Username or Password wrong, it will return "invalid" as response
return stringBuilder.toString();
} catch (ClientProtocolException cpe) {
System.out.println("Exceptionrates caz of httpResponse :" + cpe);
cpe.printStackTrace();
} catch (IOException ioe) {
System.out.println("Secondption generates caz of httpResponse :" + ioe);
ioe.printStackTrace();
}
return null;
}
// Argument comes for this method according to the return type of the doInBackground() and
//it is the third generic type of the AsyncTask
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
System.out.println("Post result :" + result);
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray login = jsonObject.getJSONArray("signup");
JSONObject jsonObject1 = login.getJSONObject(0);
String sessionid = jsonObject1.getString("sessionid");
String responsetype = jsonObject1.getString("responsetype");
String message = jsonObject1.getString("message");
Log.i("response",responsetype);
// Toast.makeText(RegisterActivity.this, responsetype, Toast.LENGTH_LONG).show();
if (TextUtils.equals(responsetype, "success")) {
Toast.makeText(RegisterActivity.this, "success !!" , Toast.LENGTH_LONG).show();
} else if (TextUtils.equals(responsetype, "failure")) {
Toast.makeText(RegisterActivity.this, "failed......!!", Toast.LENGTH_LONG).show();
}else {
Toast.makeText(RegisterActivity.this, "Invalid...", Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
// Initialize the AsyncTask class
HttpGetAsyncTask httpGetAsyncTask = new HttpGetAsyncTask(RegisterActivity.this);
// Parameter we pass in the execute() method is relate to the first generic type of the AsyncTask
// We are passing the connectWithHttpGet() method arguments to that
httpGetAsyncTask.execute(firstname,lastname,emailaddress,birthdate,password,deviceid);
}
}
答案 0 :(得分：1)
您的json有一个名为value_theme.setText(R.string.editor_div_value + "" + settings_theme);
而您在代码中使用responsetype
responsetypes删除“s”，它应该可以工作。
String responsetypes = jsonObject1.getString("responsetypes");
还使用以下参数和构造函数更新您的HttpGetAsyncTask类。因此，在HttpGetAsyncTask中添加以下代码
String responsetypes = jsonObject1.getString("responsetype");
然后初始化此调用使用代码如下 -
private Context context;
//in constructor:
public HttpGetAsyncTask(Context context){
this.context=context;
}
而不是 -
HttpGetAsyncTask httpGetAsyncTask = new HttpGetAsyncTask(RegisterActivity.this);
并显示吐司使用 -
HttpGetAsyncTask httpGetAsyncTask = new HttpGetAsyncTask();
这是因为AsyncTask不继承上下文，因此无法使用AsyncTask中的if (TextUtils.equals(responsetypes, "success")) {
Toast.makeText(context, "HTTP GET is working...", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context, "Invalid...", Toast.LENGTH_LONG).show();
}
调用UI元素
答案 1 :(得分：0)
在响应类型中添加“s”，因为在你的json中
{"signup":[
{"sessionid":0,
"responsetype":"failure",
"message":"Username emailid already register."
}
]
}