Question

我正在尝试使用loopj asynctask在android上登录以链接到数据库，但我有问题。好像JSONObject不起作用。帮我检查一下我是否犯了错误。这是我的代码

package com.truparsecreative.uimobile;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

import org.json.JSONException;
import org.json.JSONObject;


public class login extends ActionBarActivity {
public EditText username, password;
public Button login_button;
ProgressDialog progress;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    username = (EditText) findViewById(R.id.username);
    password = (EditText) findViewById(R.id.password);
    //login_button = (Button) findViewById(R.id.login);


    progress = new ProgressDialog(this);
    progress.setMessage("Connecting...");
    progress.setCancelable(false);
}

public void loginUser(View view) {
    String user = username.getText().toString();
    String pass = password.getText().toString();

    RequestParams params = new RequestParams();
    if (user != "" && pass != "") {
        params.put("username", user);
        params.put("password", pass);
        invokeWS(params);
    } else {
        Toast.makeText(getApplicationContext(), "Matric and Password cannot be empty", Toast.LENGTH_LONG).show();
    }
}

public void invokeWS(RequestParams params) {
    progress.show();
    AsyncHttpClient client = new AsyncHttpClient();
    client.post("http://10.0.2.2/uimobile/app/android/login.php", params, new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(String content) {
            super.onSuccess(content);
            progress.hide();
            try {
                JSONObject jsonObject = new JSONObject(content);
                String mat = jsonObject.getString("matric");
                if (mat !=null)
                {
                    Intent loginIntent = new Intent(getApplicationContext(), profile.class);
                    loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(loginIntent);
                    finish();
                }
            } catch (JSONException e) {
                Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
                e.printStackTrace();
            }
        }


        @Override
        public void onFailure(int statusCode, Throwable error,String content) {
            //super.onFailure(error, content);
                progress.hide();
                if (statusCode == 404) {
                    Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
                } else if (statusCode == 500) {
                    Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
                }
            }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_login, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


}

并且login.php代码是

<?php require_once('connect.php'); 
$username = $_POST['username'];
$password = $_POST['password'];
$c_login = mysql_query("SELECT * FROM users WHERE matric = '$username' AND password = '$password'");
if (mysql_num_rows($c_login)>0)
{
    echo "Correct Details";
    //$output = array();
    $content = mysql_fetch_array($c_login);
    $output = array(
        'matric'=> $content['matric'],
        'password'=> $content['password'],
        'email'=> $content['email']
        );
    print json_encode($output);
}
else
{
     echo "Username and password didn't match".mysql_error();
}

?>

Answer 1

在PHP代码中，您在发送JSON对象之前执行此操作：

echo "Correct Details";

由于该行，您的PHP代码不会向Android应用程序发送有效的JSON对象。 PHP脚本的结果将具有以下格式：

Correct Details
{
  matric: "some value",
  password: "some value",
  email: "some value"
}

由于Correct Details

生成的第一行echo "Correct Details";，这不是有效的JSON对象

服务器Json响应我对android上的JSONObject无效

1 个答案: