用户通过互联网认证后，如何从登录活动转发或移动到家庭活动?

Question

下面是将用户详细信息发送到php文件的类，成功登录后在AlertDialog框中显示echo语句。所以这工作得很好…

BackgroundActivity.java

package com.example.weblogin;
import android.app.AlertDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
public class BackgroundTask extends AsyncTask<String,Void,String> {
AlertDialog alertDialog;
Context ctx;
BackgroundTask(Context ctx)
{
this.ctx =ctx;
}
@Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(ctx).create();
alertDialog.setTitle("Login Information....");
}
@Override
protected String doInBackground(String... params) {
String reg_url = "http://10.0.0.2/androidapp/register.php";
String login_url = "http://10.0.0.2/androidapp/login.php";
String method = params[0];
if (method.equals("register")) {
String name = params[1];
String user_name = params[2];
String user_pass = params[3];
try {
URL url = new URL(reg_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
//httpURLConnection.setDoInput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8") + "&" +
URLEncoder.encode("user_name", "UTF-8") + "=" + URLEncoder.encode(user_name, "UTF-8") + "&" +
URLEncoder.encode("user_pass", "UTF-8") + "=" + URLEncoder.encode(user_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
//httpURLConnection.connect();
httpURLConnection.disconnect();
return "Registration Success...";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
else if(method.equals("login"))
{
String login_name = params[1];
String login_pass = params[2];
try {
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
String data = URLEncoder.encode("login_name","UTF-8")+"="+URLEncoder.encode(login_name,"UTF-8")+"&"+
URLEncoder.encode("login_pass","UTF-8")+"="+URLEncoder.encode(login_pass,"UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String response = "";
String line = "";
while ((line = bufferedReader.readLine())!=null)
{
response+= line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return response;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
if(result.equals("Registration Success..."))
{
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
}
else
{
alertDialog.setMessage(result);
alertDialog.show();
}
}
}

但是现在我想将用户转发到下一个活动或家庭活动后成功登录或一旦用户被认证…下面是登录活动(MainActivity)代码…

MainActivity.java

package com.example.weblogin;
import android.app.Activity;
import android.content.Intent;
import android.os.StrictMode;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends Activity{
EditText ET_NAME,ET_PASS;
String login_name,login_pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ET_NAME = (EditText)findViewById(R.id.edittext_username);
ET_PASS = (EditText)findViewById(R.id.edittext_password);
}
public void userReg(View view)
{
startActivity(new Intent(this,Register.class));
}
public void userLogin(View view)
{
login_name = ET_NAME.getText().toString();
login_pass = ET_PASS.getText().toString();
String method = "login";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method,login_name,login_pass);
}
}

这是我的php文件它返回一些语句然后在AlertDialog中显示…

login。

<?php  
require "../dbconnect.php";  
$user_name = $_POST["login_name"];  
$user_pass =  $_POST["login_pass"];  
$sql_query = "select Firstname,Lastname from users where emailid like '$user_name' and password like '$user_pass';";  
$result = mysqli_query($db_conx,$sql_query);  
if(mysqli_num_rows($result) >0 )  
{  
$row = mysqli_fetch_assoc($result);  
$name =$row["Firstname"]." ".$row["Lastname"];  
echo "Login Success..Welcome ".$name;  
}  
else  
{   
echo "Login Failed.......Try Again..";  
}  
?>  

那么我能做些什么来获得MainActivity.java中的结果，或者我还能做些什么来检查响应并将用户转发到下一个活动?

Answer 1

从onPostExecute调用你想要的Activity !

@Override
protected void onPostExecute(String result) {
if(result.equals("Registration Success..."))
{
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
Intent intent = new Intent(this, MyActivity.class);
ctx.startActivity(intent);
}
else
{
alertDialog.setMessage(result);
alertDialog.show();
}
}

Answer 2

检查结果并执行以下操作以进入下一个意图这是你想要打开的Activity

将DisplayMessageActivity.class替换为需要的class。

String result = fetchedResult;
String successMessage = "Login Success..Welcome ".$name";
if (result.equals(successMessage)) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
startActivity(intent);
finish(); //To remove the login screen from backstack
}