我是Android新手。我无法将微调器值发送到jsonobject。我收到一个错误：“选中无法解析为变量”。以下是我的代码。请告诉我我需要做什么。提前致谢。
public class SignupActivity extends Activity implements OnItemSelectedListener {
public Button buttonsign;
public Spinner spinner;
public EditText edit_message1, edit_message2, edit_message3, edit_message4, edit_message5, edit_message6, edit_message7, edit_message8;
public String firstname, lastname, birthday, username, password, retypepassword, parentsemail;
private static final String TAG = "SignupActivity.java";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_signup);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
addListenerOnButton();
StrictMode.enableDefaults();
spinner = (Spinner) findViewById(R.id.spinner);
List<String> list = new ArrayList<String>();
list.add("SELECT");
list.add("Grade 1");
list.add("Grade 2");
list.add("Grade 3");
list.add("Grade 4");
list.add("Grade 5");
list.add("Grade 6");
list.add("Grade 7");
list.add("Grade 8");
list.add("Grade 9");
list.add("Grade 10");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>
(this, android.R.layout.simple_spinner_item,list);
dataAdapter.setDropDownViewResource
(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
spinner.setOnItemSelectedListener(this);
}
private void addListenerOnButton() {
// TODO Auto-generated method stub
buttonsign = (Button) findViewById(R.id.buttonsign);
edit_message1=(EditText) findViewById(R.id.edit_message1);
edit_message2=(EditText) findViewById(R.id.edit_message2);
edit_message3=(EditText) findViewById(R.id.edit_message3);
//edit_message4=(EditText) findViewById(R.id.spinner);
edit_message5=(EditText) findViewById(R.id.edit_message5);
edit_message6=(EditText) findViewById(R.id.edit_message6);
edit_message7=(EditText) findViewById(R.id.edit_message7);
edit_message8=(EditText) findViewById(R.id.edit_message8);
spinner = (Spinner) findViewById(R.id.spinner);
buttonsign.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
InputMethodManager inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS);
String firstname = edit_message1.getText().toString();
String lastname = edit_message2.getText().toString();
String birthday = edit_message3.getText().toString();
String grade = spinner.getSelectedItem().toString();
String username = edit_message5.getText().toString();
String password = edit_message6.getText().toString();
String retypepassword = edit_message7.getText().toString();
String parentsemail = edit_message8.getText().toString();
if(firstname.equals("")) {
Toast.makeText(SignupActivity.this,"Enter First Name", Toast.LENGTH_LONG).show();
}
else if(lastname.equals("")) {
Toast.makeText(SignupActivity.this,"Enter Last Name", Toast.LENGTH_LONG).show();
}
else if(birthday.equals("")) {
Toast.makeText(SignupActivity.this,"Enter Your Birthday", Toast.LENGTH_LONG).show();
}
/* else if(grade.equals("SELECT")) {
Toast.makeText(SignupActivity.this,"Enter Your Grade", Toast.LENGTH_LONG).show();
}
*/
else if(username.equals("")) {
Toast.makeText(SignupActivity.this,"Enter Username", Toast.LENGTH_LONG).show();
}
else if(password.equals("")) {
Toast.makeText(SignupActivity.this,"Enter Password", Toast.LENGTH_LONG).show();
}
else if(retypepassword.equals("")) {
Toast.makeText(SignupActivity.this,"Enter Re-Type Password", Toast.LENGTH_LONG).show();
}
else if(!retypepassword.equals(password)) {
Toast.makeText(SignupActivity.this,"Password Not Matching", Toast.LENGTH_LONG).show();
}
else if(username.equals(password)) {
Toast.makeText(SignupActivity.this,"Username & Password should be different", Toast.LENGTH_LONG).show();
}
else if(parentsemail.equals("")) {
Toast.makeText(SignupActivity.this,"Enter Parent's Email", Toast.LENGTH_LONG).show();
}
else
{
try {
HttpClient client = new DefaultHttpClient();
String url = "http: ...";
HttpPost request = new HttpPost(url);
Log.v(TAG, "postURL: " + request);
JSONObject registration = new JSONObject();
registration.put("firstname", firstname);
registration.put("lastname", lastname);
registration.put("birthday", birthday);
registration.put("grade", selected);
registration.put("username", username);
registration.put("password", password);
registration.put("parentsemail", parentsemail);
JSONArray jsonArray = new JSONArray();
jsonArray.put(registration);
List <NameValuePair> nvps = new ArrayList <NameValuePair>();
nvps.add(new BasicNameValuePair("studentregistration", registration.toString()));
request.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
request.setHeader(HTTP.CONTENT_TYPE,"application/x-www-form-urlencoded;charset=UTF-8");
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
if (entity != null) {
String responseStr = EntityUtils.toString(entity).trim();
Log.v(TAG, "Response: " + responseStr);
Log.i("TAG",""+response.getStatusLine().getStatusCode());
Toast.makeText(SignupActivity.this, responseStr, Toast.LENGTH_LONG).show();
}
Toast.makeText(SignupActivity.this, "studentregistration: " +registration,Toast.LENGTH_LONG).show();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Throwable t) {
Toast.makeText(SignupActivity.this, "Request failed: " + t.toString(),
Toast.LENGTH_LONG).show();
}
}
}
});
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
String selected = parent.getItemAtPosition(position).toString();
((TextView) parent.getChildAt(0)).setTextColor(Color.WHITE);
((TextView) parent.getChildAt(0)).setTextSize(24);
if(selected.equals("SELECT")) {
Toast.makeText(parent.getContext(),"Enter Your Grade", Toast.LENGTH_LONG).show();
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
答案 0 :(得分：1)
您收到
行中的错误 registration.put("grade", selected);
因为变量selected是在onItemSelected方法
全局声明selected变量。
或者你可以使用
registration.put("grade", grade );
或
registration.put("grade", spinner.getSelectedItem().toString() );