Java 使用android studio和php更新mysql数据库中的点
我目前有一个有效的登录/注册系统。当用户登录并单击一个按钮时,用户名会被带到Points.php文件中。然后,php将获取用户名并向该特定用户点列添加+5点。如果你能帮忙,我会非常感激,谢谢! 这是我目前正在尝试使用的: activity_user_area.xml:Java 使用android studio和php更新mysql数据库中的点,java,php,android,mysql,Java,Php,Android,Mysql,我目前有一个有效的登录/注册系统。当用户登录并单击一个按钮时,用户名会被带到Points.php文件中。然后,php将获取用户名并向该特定用户点列添加+5点。如果你能帮忙,我会非常感激,谢谢! 这是我目前正在尝试使用的: activity_user_area.xml: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/a
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="@dimen/activity_horizontal_margin">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/tvWelcomeMsg"
android:text="Username"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/etUsername"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/textView"
android:editable="false" />
<TextView
android:id="@+id/tvWelcomeMsg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Welcome"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:text="Earn Points"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignRight="@+id/tvWelcomeMsg"
android:layout_alignEnd="@+id/tvWelcomeMsg"
android:id="@+id/bEarn"/>
</RelativeLayout>
UserAreaActivity.java:
import android.app.AlertDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
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 UserAreaActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_area);
Intent intent = getIntent();
final String username = intent.getStringExtra("username");
final Button bEarn = (Button) findViewById(R.id.bEarn);
TextView tvWelcomeMsg = (TextView) findViewById(R.id.tvWelcomeMsg);
final EditText etUsername = (EditText) findViewById(R.id.etUsername);
// Display user details
String message = "Welcome, " + username + "!";
tvWelcomeMsg.setText(message);
etUsername.setText(username);
bEarn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final String username = etUsername.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) {
AlertDialog.Builder builder = new AlertDialog.Builder(UserAreaActivity.this);
builder.setMessage("Points Added")
.create()
.show();
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(UserAreaActivity.this);
builder.setMessage("Points Not Added")
.setNegativeButton("Retry", null)
.create()
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
EarnRequest earnRequest = new EarnRequest(username, responseListener);
RequestQueue queue = Volley.newRequestQueue(UserAreaActivity.this);
queue.add(earnRequest);
}
});
}
}
导入android.app.AlertDialog;
导入android.content.Intent;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.view.view;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.TextView;
导入com.android.volley.RequestQueue;
导入com.android.volley.Response;
导入com.android.volley.toolbox.volley;
导入org.json.JSONException;
导入org.json.JSONObject;
公共类UserAreaActivity扩展了AppCompatActivity{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u user\u区域);
Intent=getIntent();
最终字符串用户名=intent.getStringExtra(“用户名”);
最终按钮bEarn=(按钮)findViewById(R.id.bEarn);
TextView tvWelcomeMsg=(TextView)findViewById(R.id.tvWelcomeMsg);
最终EditText etUsername=(EditText)findViewById(R.id.etUsername);
//显示用户详细信息
字符串消息=“欢迎,”+username+“!”;
tvwelcomesg.setText(消息);
etUsername.setText(用户名);
bEarn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
最终字符串username=etUsername.toString();
Response.Listener responseListener=新的Response.Listener(){
@凌驾
公共void onResponse(字符串响应){
试一试{
JSONObject jsonResponse=新的JSONObject(响应);
boolean success=jsonResponse.getBoolean(“success”);
如果(成功){
AlertDialog.Builder=新建AlertDialog.Builder(UserAreaActivity.this);
builder.setMessage(“添加的点”)
.create()
.show();
}否则{
AlertDialog.Builder=新建AlertDialog.Builder(UserAreaActivity.this);
builder.setMessage(“未添加点”)
.setNegativeButton(“重试”,null)
.create()
.show();
}
}捕获(JSONException e){
e、 printStackTrace();
}
}
};
EarnRequest EarnRequest=新的EarnRequest(用户名、响应者);
RequestQueue=Volley.newRequestQueue(UserAreaActivity.this);
queue.add(请求);
}
});
}
}
EarnRequest.java:
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;
import java.util.HashMap;
import java.util.Map;
public class EarnRequest extends StringRequest {
private static final String EARN_REQUEST_URL = "https://mysite567356ht7ieyjr6u7je.000webhostapp.com/Points.php";
private Map<String, String> params;
public EarnRequest(String username, Response.Listener<String> listener) {
super(Method.POST, EARN_REQUEST_URL, listener, null);
params = new HashMap<>();
params.put("username", username);
}
@Override
public Map<String, String> getParams() {
return params;
}
}
import com.android.volley.Response;
导入com.android.volley.toolbox.StringRequest;
导入java.util.HashMap;
导入java.util.Map;
公共类EarnRequest扩展了StringRequest{
私有静态最终字符串EARN\u REQUEST\u URL=”https://mysite567356ht7ieyjr6u7je.000webhostapp.com/Points.php";
私有映射参数;
公共请求(字符串用户名,Response.Listener){
super(Method.POST,EARN\u REQUEST\u URL,listener,null);
params=新的HashMap();
参数put(“用户名”,用户名);
}
@凌驾
公共映射getParams(){
返回参数;
}
}
Points.php:
<?php
$con = mysqli_connect("localhost", "id177667_root", "***", "id177667_loginb");
$username = $_POST["username"];
$statement = mysqli_prepare($con, "UPDATE user SET points = points + 5 WHERE username_column =".$username);
mysqli_stmt_bind_param($statement, "s", $username);
mysqli_stmt_execute($statement);
$response = array();
$response["success"] = true;
echo json_encode($response);
?>
首先在php文件中使用
Select points from user where username_column =$username
然后使用update查询语句
$result=$result + 5;
UPDATE user SET points = $result WHERE username_column =$username
应该是
。。其中username\u column=?
在prepare语句中(占位符?
而不是$username
)。你没有做任何错误处理,你只是假设一切都很顺利。那么,你说我的php应该是这样的<代码>mysqli_prepare($con,“更新用户设置点=点+5,其中用户名_列=?”)代码>像这样,看看引号。