在 php 脚本的支持下,我有一段代码在 Async Task 中运行。我只想检查我的数据库中是否存在电子邮件 ID。我想显示 toast :“电子邮件已存在”(如果在数据库中)。否则另一个 toast :“注册成功”。我在下面给出的方法仅适用于其他条件。我将如何实现这一目标?请帮助我。
这是我的.java
class SummaryAsyncTask extends AsyncTask<Void, Boolean, String> {
private void postData(String fname,String lname,String email,String pass,String cpass,String mobile) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://xxxx/registration.php");
try {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(6);
nameValuePairs.add(new BasicNameValuePair("fname", fname));
nameValuePairs.add(new BasicNameValuePair("lname", lname));
nameValuePairs.add(new BasicNameValuePair("email", email));
nameValuePairs.add(new BasicNameValuePair("pass", pass));
nameValuePairs.add(new BasicNameValuePair("cpass", cpass));
nameValuePairs.add(new BasicNameValuePair("mobile", mobile));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httppost);
httpEntity = response.getEntity();
InputStream is = httpEntity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8); // From here you can extract the data that you get from your php file..
StringBuilder builder = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
builder.append(line + "\n");
}
is.close();
json = new JSONObject(builder.toString());// Here you are converting again the string into json object. So that you can get values with the help of keys that you send from the php side.
message = json.getString("message");
}
catch(Exception e)
{
Log.e("log_tag", "Error: "+e.toString());
}
}
@Override
protected void onPostExecute(final String message) {
super.onPostExecute(message);
runOnUiThread(new Runnable() {
public void run() {
if (message!=null) {
Toast.makeText(Response.this,"Email Id already exist", Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(Response.this, "Thank You!You have registered successfully", Toast.LENGTH_LONG).show();
}
}
});
}
@Override
protected String doInBackground(Void... params) {
postData(first,last,eid,pword,conp,mob);
return null;
}
}
我的 .php 文件
<?php
$con=mysql_connect("localhost","root","");
$sel=mysql_select_db("xxx",$con);
$fname=$_POST['fname'];
$lname=$_POST['lname'];
$email=$_POST['email'];
$pass=$_POST['pass'];
$cpass=$_POST['cpass'];
$mobile=$_POST['mobile'];
$query=mysql_query("SELECT * FROM user WHERE email='$email'");
if(mysql_num_rows($query)>0){
$response["message"] = "Email Id already exist.";
echo json_encode($response);
}
else{
mysql_query("insert into member(fname,lname,email,pass,cpass,mobile) values ('$fname','$lname', '$email', '$pass','$cpass','$mobile')", $con);
}
?>
最佳答案
因为您在onPostExecute
中的message
总是null
所以试试
protected String doInBackground(Void... params) {
return postData(first,last,eid,pword,conp,mob);
}
和 postData
方法应该返回 String
。即将 postData
函数重写为
private String postData(String fname,String lname,String email,String pass,String cpass,String mobile) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://xxxx/registration.php");
try {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(6);
nameValuePairs.add(new BasicNameValuePair("fname", fname));
nameValuePairs.add(new BasicNameValuePair("lname", lname));
nameValuePairs.add(new BasicNameValuePair("email", email));
nameValuePairs.add(new BasicNameValuePair("pass", pass));
nameValuePairs.add(new BasicNameValuePair("cpass", cpass));
nameValuePairs.add(new BasicNameValuePair("mobile", mobile));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httppost);
httpEntity = response.getEntity();
InputStream is = httpEntity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8); // From here you can extract the data that you get from your php file..
StringBuilder builder = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
builder.append(line + "\n");
}
is.close();
json = new JSONObject(builder.toString());// Here you are converting again the string into json object. So that you can get values with the help of keys that you send from the php side.
message = json.getString("message");
}
catch(Exception e)
{
Log.e("log_tag", "Error: "+e.toString());
}
return message;
}
和onPostExcute
方法一样
@Override
protected void onPostExecute(final String message) {
super.onPostExecute(message);
if (message!=null) {
Toast.makeText(Response.this,"Email Id already exist", Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(Response.this, "Thank You!You have registered successfully", Toast.LENGTH_LONG).show();
}
}
关于android - 需要在异步任务中工作 'onPostExecute',我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24258865/