我正在尝试为Android应用程序构建用户数据库，我正在按照Tonikami（https://www.youtube.com/watch?v=QxffHgiJ64M&list=PLe60o7ed8E-TztoF2K3y4VdDgT6APZ0ka）制作的教程。我相信我已经复制了他的代码，但我仍然无法将数据从应用程序传递到数据库。
这是我的注册活动：
package com.example.jerem.myapplication;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
public class RegisterActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
final EditText etName = (EditText) findViewById(R.id.etName);
final EditText etUsername = (EditText) findViewById(R.id.etUsername);
final EditText etPassword = (EditText) findViewById(R.id.etPassword);
final EditText etAge = (EditText) findViewById(R.id.etAge);
final Button buttonRegister = (Button) findViewById(R.id.buttonRegister);
buttonRegister.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
final String name = etName.getText().toString();
final String username = etUsername.getText().toString();
final int age = Integer.parseInt(etAge.getText().toString());
final String password = etPassword.getText().toString();
Response.Listener<String> responseListener = new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
boolean success = jsonResponse.getBoolean("success");
if(success) {
Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
RegisterActivity.this.startActivity(intent);
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(RegisterActivity.this);
builder.setMessage("Register Failed")
.setNegativeButton("Retry", null)
.create()
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
RegisterRequest registerRequest = new RegisterRequest(name, username, age, password, responseListener);
RequestQueue queue = Volley.newRequestQueue(RegisterActivity.this);
queue.add(registerRequest);
}
});
}
}
这是我的RegisterRequest活动：
package com.example.jerem.myapplication;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;
import java.util.HashMap;
import java.util.Map;
public class RegisterRequest extends StringRequest{
private static final String REGISTER_REQUEST_URL = "http://jeremylevasseur.comlu.com/register.php";
private Map<String, String> params;
public RegisterRequest(String name, String username, int age, String password, Response.Listener<String> listener){
super(Method.POST, REGISTER_REQUEST_URL, listener, null);
params = new HashMap<>();
params.put("name", name);
params.put("age", age + "");
params.put("username", username);
params.put("password", password);
}
@Override
public Map<String, String> getParams() {
return params;
}
}
这是我的android清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.jerem.myapplication">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat.Light">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RegisterActivity" />
<activity android:name=".UserAreaActivity"></activity>
</application>
</manifest>
这是我运行应用程序并输入新用户时的LOGCAT图片：
这是我收到的LOGCAT例外：
08-09 10:54:55.124 2896-2896/com.example.jerem.myapplication E/MYAPP: unexpected JSON exception
org.json.JSONException: Value <br><table of type java.lang.String cannot be converted to JSONObject
at org.json.JSON.typeMismatch(JSON.java:111)
at org.json.JSONObject.<init>(JSONObject.java:160)
at org.json.JSONObject.<init>(JSONObject.java:173)
at com.example.jerem.myapplication.RegisterActivity$1$1.onResponse(RegisterActivity.java:44)
at com.example.jerem.myapplication.RegisterActivity$1$1.onResponse(RegisterActivity.java:40)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
08-09 10:55:13.211 2896-2937/com.example.jerem.myapplication E/Surface: getSlotFromBufferLocked: unknown buffer: 0xa9f4f2a0
这是我的PHP文件＆＃34; login.php＆＃34;：
<?php
$con = mysqli_connect("server38.000webhost.com", "a4434902_admin", "1234abcd", "a4434902_users");
$username = $_POST["username"];
$password = $_POST["password"];
$statement = mysqli_prepare($con, "SELECT * FROM user WHERE username = ? AND password = ?");
mysqli_stmt_bind_param($statement, "ss", $username, $password);
mysqli_stmt_execute($statement);
mysqli_stmt_store_result($statement);
mysqli_stmt_bind_result($statement, $userID, $name, $age, $username, $password);
$response = array();
$response["success"] = false;
while(mysqli_stmt_fetch($statement)){
$response["success"] = true;
$response["name"] = $name;
$response["age"] = $age;
$response["username"] = $username;
$response["password"] = $password;
}
echo json_encode($response);
?>
这是我的PHP文件，名为＆＃39; register.php＆＃39;：
<?php
$con = mysqli_connect("server38.000webhost.com", "a4434902_admin", "1234abcd", "a4434902_users");
$name = $_POST["name"];
$age = $_POST["age"];
$username = $_POST["username"];
$password = $_POST["password"];
$statement = mysqli_prepare($con, "INSERT INTO user (name, username, age, password) VALUES (?, ?, ?, ?)");
mysqli_stmt_bind_param($statement, "ssis", $name, $username, $age, $password);
mysqli_stmt_execute($statement);
$response = array();
$response["success"] = true;
echo json_encode($response);
?>