我正在尝试显示提交的数据的消息，并且用户存在于onPostExecute（）方法中，但它没有正确显示消息给我建议 当我运行应用程序时，它显示来自onPost方法的捕获消息我希望通过操作显示特定消息
//java file
public class SignupActivity extends AsyncTask<String, Void, String> {
private Context context;
public SignupActivity(Context context) {
this.context = context;
}
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... arg0) {
String fullName = arg0[0];
// String userName = arg0[1];
String passWord = arg0[1];
String phoneNumber = arg0[2];
String emailAddress = arg0[3];
String link;
String data;
BufferedReader bufferedReader;
String result;
try {
data = "?fullname=" + URLEncoder.encode(fullName, "UTF-8");
// data += "&username=" + URLEncoder.encode(userName, "UTF-8");
data += "&password=" + URLEncoder.encode(passWord, "UTF-8");
data += "&phonenumber=" + URLEncoder.encode(phoneNumber, "UTF-8");
data += "&emailaddress=" + URLEncoder.encode(emailAddress, "UTF-8");
link = "http://... .php" + data;
URL url = new URL(link);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
result = bufferedReader.readLine();
return result;
} catch (Exception e) {
return new String("Exception: " + e.getMessage());
}
}
@Override
protected void onPostExecute(String result) {
String jsonStr = result;
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String query_result = jsonObj.getString("query_result");
if (query_result.equals("SUCCESS")) {
Toast.makeText(context, "Data inserted successfully. Signup successfully.", Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(context, "Exist Already.", Toast.LENGTH_SHORT).show();
}
/* else if (query_result.equals("FAILURE")) {
Toast.makeText(context, "Data could not be inserted. Signup failed.", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(context, "Couldn't connect to remote database.", Toast.LENGTH_SHORT).show();
} */
} catch (JSONException e) {
e.printStackTrace();
// Toast.makeText(context, "Error parsing JSON Please data Fill all the records.", Toast.LENGTH_SHORT).show();
// Toast.makeText(context, "Please LogIn", Toast.LENGTH_SHORT).show();
Toast.makeText(context, "Please Login", Toast.LENGTH_SHORT).show();
}
/* if (jsonStr == null) {
Toast.makeText(context, "cond1", Toast.LENGTH_SHORT).show();
}
else if(jsonStr != null)
{
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String query_result = jsonObj.getString("query_result");
if (query_result.equals("SUCCESS")) {
Toast.makeText(context, "Data inserted successfully. Signup successfull.", Toast.LENGTH_LONG).show();
}
// else if (query_result.equals("FAILURE")) {
// Toast.makeText(context, "Data could not be inserted. Signup failed.", Toast.LENGTH_SHORT).show();
// }
else{
Toast.makeText(context, "Exists", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
// Toast.makeText(context, "Error parsing JSON Please data Fill all the records.", Toast.LENGTH_SHORT).show();
Toast.makeText(context, "Please LogIn", Toast.LENGTH_SHORT).show();
}
}
else{
Toast.makeText(context, "cond2", Toast.LENGTH_SHORT).show();
}
*/
/* if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String query_result = jsonObj.getString("query_result");
if (query_result.equals("SUCCESS")) {
Toast.makeText(context, "Data inserted successfully. Signup successfully.", Toast.LENGTH_LONG).show();
}
else if (query_result.equals("FAILURE")) {
Toast.makeText(context, "Data could not be inserted. Signup failed.", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(context, "Couldn't connect to remote database.", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
// Toast.makeText(context, "Error parsing JSON Please data Fill all the records.", Toast.LENGTH_SHORT).show();
// Toast.makeText(context, "Please LogIn", Toast.LENGTH_SHORT).show();
Toast.makeText(context, "Please Login", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(context, "Couldn't get any JSON data.", Toast.LENGTH_SHORT).show();
} */
}
}
PHP代码
<?php
$mysql = new mysqli('localhost', 'user', 'pass', 'db');
/* If an error code is reported... */
if($mysql->connect_errno)
{
echo json_encode(array(
'query_result' => 'ERROR'
));
}
/* Otherwise go ahead... */
else
{
/* Prepare a select statement to check user existence */
$selectStmt = $mysql->prepare("SELECT * FROM `users10` WHERE `phone` = ? OR `email` = ?");
/* Retrieve arguments */
$fullName = $_GET['fullname'];
//$userName = $_GET['username'];
$passWord = $_GET['password'];
$phoneNumber = $_GET['phonenumber'];
$emailAddress = $_GET['emailaddress'];
/* Binding parameters */
$selectStmt->bind_param('ss', $phoneNumber, $emailAddress);
/* Execute statement */
if (!$selectStmt->execute()) {
echo json_encode(array(
'query_result' => 'ERROR'
));
}
else
{
/* If the number of returned rows is 0 */
if(0 === $selectStmt->get_result()->num_rows)
{
$insertStmt = $mysql->prepare("INSERT INTO `users10` (`fullname`, `password`, `phone`, `email`) VALUES (?, ?, ?, ?)");
$insertStmt->bind_param('ssss', $fullName, $passWord, $phoneNumber, $emailAddress);
/* Try to insert the new user */
if (!$insertStmt->execute()) {
echo json_encode(array(
'query_result' => 'FAILURE'
));
}
else
{
echo json_encode(array(
'query_result' => 'SUCCESS'
));
}
}
else
{
echo json_encode(array(
'query_result' => 'FAILURE'
));
}
}
}
?>
答案 0 :(得分：0)
我认为您的jsonStr存在问题，您应该替换此行
return new String("Exception: " + e.getMessage());
带
return null;
在你的onpostexecute中这样做
@Override
protected void onPostExecute(String result) {
String jsonStr = result;
try {
Log.d("jsonStr","jsonStr="+jsonStr); // to check in logcat you have a valid json string
if(!TextUtils.isEmpty(jsonStr)){ // to be sure jsonStr is not null and not empty
JSONObject jsonObj = new JSONObject(jsonStr.trim());
String query_result = jsonObj.getString("query_result");
if (query_result.equalIgnoreCase("SUCCESS")) {
Toast.makeText(context, "Data inserted successfully. Signup successfully.", Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(context, "Exist Already.", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(context, "your jsonStr is empty or null", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
//JSONObject jsonObj = new JSONObject(jsonStr); Exception at this line
Toast.makeText(context, "you have a bad json string", Toast.LENGTH_SHORT).show();
}
}
希望它可以帮到你