我正在尝试创建一个登录页面，使用社会安全号码和密码作为登录参数。我使用的是外部数据库（MySQL）。我从PHP文件中获得响应，但在检查响应以转到活动时遇到问题。
这是我的登录类：
package com.ajibola.demola;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Login extends Activity {
private EditText ninum , pass;
private String strniNum,strPass;
private Button login;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
GetIPAddress getIPaddress = new GetIPAddress();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("Login");
setContentView(R.layout.activity_login);
ninum = (EditText)findViewById(R.id.edtninum);
pass = (EditText)findViewById(R.id.edtpass);
login = (Button)findViewById(R.id.logbut);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
strniNum = ninum.getText().toString();
strPass = pass.getText().toString();
if(strniNum.length() == 0 || strPass.length() == 0){
showToast("Please fill in a National Id and a password");
}else{
dialog = ProgressDialog.show(Login.this, "", "Validating user...", true);
new Thread(new Runnable() {
public void run() {
login();
}
}).start();
}
}
});
}
private void login() {
// TODO Auto-generated method stub
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost(getIPaddress.getIP()+"check.php"); // make sure the url is correct.
//add your data
nameValuePairs = new ArrayList<NameValuePair>(2);
// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
nameValuePairs.add(new BasicNameValuePair("social_security", ninum.getText().toString().trim())); // $Edittext_value = $_POST['Edittext_value'];
nameValuePairs.add(new BasicNameValuePair("password", pass.getText().toString().trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute HTTP Post Request
response=httpclient.execute(httppost);
// edited by James from coderzheaven.. from here....
ResponseHandler<String> responseHandler = new BasicResponseHandler();
final String responsee = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + response);
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(Login.this, "Response from PHP : " + responsee, Toast.LENGTH_SHORT).show();
if(responsee.trim().equalsIgnoreCase("lecturer")){
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(Login.this, "success", Toast.LENGTH_SHORT).show();
}
});
Intent in=new Intent(Login.this, MainActivity.class);
startActivity(in);
//startActivity(new Intent(Login.this, MainActivity.class));
//tv.setText();hjg,jhg
//Intent in=new Intent(Login.this, MainActivity.class);
//startActivity(in);
dialog.dismiss(); }
else{
Toast.makeText(Login.this, "failed", Toast.LENGTH_SHORT).show();
}
}
});
}catch(Exception e){
dialog.dismiss();
System.out.println("Exception : " + e.getMessage());
}
/*if(responsee.equals("lecturer")){
Toast.makeText(Login.this,"Login Success", Toast.LENGTH_SHORT).show();
Intent in = new Intent(Login.this, Register.class);
startActivity(in);
}*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
public void signUp(View v){
Intent in = new Intent(Login.this,Register.class);
startActivity(in);
}
public void showToast(String msg){
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
}
这是PHP登录文件
<?php
$con = mysql_connect("localhost", "root", "");
if(!$con)
{
die('Could not connect: ' .mysql_error());
}
mysql_select_db("demola", $con);
$social_security = $_POST['social_security'];
$password = $_POST['password'];
$query = "select * from users where social_security ='" .$social_security. "' AND password ='".$password."'";
$query_exec = mysql_query($query) or die(mysql_error());
// if and else
$rows = mysql_num_rows($query_exec);
if ($rows == 1) {
echo "lecturer";
}
else{
echo "No user was found";
}
mysql_close($con);
?>
您需要通过async在后台执行此代码，然后在Postexecute上启动一个新的"活动"：这是一个粗略的例子
public class AsyncTaskTestActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// This starts the AsyncTask
new MyTask().execute("my string paramater passed in this can be your login credentials");
}
类别：
private class MyTask extends AsyncTask < String,
Integer,
String > {
// This is run in a background thread
@Override
protected String doInBackground(String...passed_in_string) {
// get the string from params, which is an array (your login stuff)
//replace your nameValuePairs with this array instead
String myString = passed_in_string[0];
httpclient = new DefaultHttpClient();
httppost = new HttpPost(getIPaddress.getIP() + "check.php"); // make sure the url is correct.
//add your data
nameValuePairs = new ArrayList < NameValuePair > (2);
// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
nameValuePairs.add(new BasicNameValuePair("social_security", ninum.getText().toString().trim())); // $Edittext_value = $_POST['Edittext_value'];
nameValuePairs.add(new BasicNameValuePair("password", pass.getText().toString().trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute HTTP Post Request
response = httpclient.execute(httppost);
// edited by James from coderzheaven.. from here....
ResponseHandler < String > responseHandler = new BasicResponseHandler();
final String responsee = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + response);
//then this string is passed to onPostExecute;
return passed_in_string;
}
// This runs in UI when background thread finishes
@Override
protected void onPostExecute(String responsee) {
super.onPostExecute(responsee);
//login
if (responsee.trim().equalsIgnoreCase("lecturer")) {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(Login.this, "success", Toast.LENGTH_SHORT).show();
}
});
Intent in = new Intent(Login.this, MainActivity.class);
startActivity( in );
}
}
}