凌空 GET 请求:字符 0 处的输入结束

我有问题...我的php代码通过GET方法工作，当我得到"id"并得到"速率"我的SQLDatabase更新并且我的输出是树参数编码Json(OldRate，YourRate，TotalRate(。对PHP输出进行编码后，它似乎是正确的，但是在AndroidStudio中，我的GET请求方法有问题。错误内容是这样的：

01-20 15:04:25.883 3623-3623/info.androidhive.customlistviewvolley E/ERROR: Error occurred 
                                                                        com.android.volley.ParseError: org.json.JSONException: End of input at character 0 of 
                                                                            at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:73)
                                                                            at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:121)
                                                                         Caused by: org.json.JSONException: End of input at character 0 of 
                                                                            at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
                                                                            at org.json.JSONTokener.nextValue(JSONTokener.java:97)
                                                                            at org.json.JSONObject.<init>(JSONObject.java:156)
                                                                            at org.json.JSONObject.<init>(JSONObject.java:173)
                                                                            at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:68)
                                                                            at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:121)

这是我的PHP代码：

<?php
require_once 'includeconfig.php';
// connect to database
$con = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);
mysqli_set_charset($con, 'utf8');
//GETS
if(isset ($_GET['ID']) && isset($_GET['Rating'])){
$ID = $_GET['ID'];  
$MyRate = $_GET['Rating'];  }
else{return;}

//CountVote
$sql1="UPDATE `civilarticle` SET  `Counter`= `Counter`+1 WHERE `ID`=$ID";
$sql2= "SELECT `Counter` FROM `civilarticle` WHERE `ID`=$ID";
if($con->query($sql1) === TRUE ){
    //echo "Item updated successfully"."<br>";
} else{
    echo "Error : " . $con->error ;
}
if ($result = $con->query($sql2)) {
    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
    $COUNTVote=$row["Counter"];
    //echo "<br>".$row["Counter"]."<br>"."*****"."<br>";
}}

//PASTVote
if(`Counter`<1){
$sql3="UPDATE `civilarticle` SET  `PastRate`= (`PastRate`+$MyRate)/2 WHERE `ID`=$ID";}
else{$sql3="UPDATE `civilarticle` SET  `PastRate`= 0 WHERE `ID`=$ID";}
$sql4= "SELECT `PastRate` FROM `civilarticle` WHERE `ID`=$ID";
if($con->query($sql3) === TRUE ){
    //echo "Item updated successfully"."<br>";
} else{
    echo "Error : " . $con->error ;
}
if ($result = $con->query($sql4)) {
    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
    $PASTVote=$row["PastRate"];
    //echo "<br>".$row["PastRate"]."<br>"."*****"."<br>";
}}  
//YOURVote
$sql5 = "UPDATE `civilarticle` SET  `YourRate`='$MyRate' WHERE `ID`=$ID";
$sql6="SELECT `YourRate` FROM `civilarticle` WHERE `ID`=$ID";
if($con->query($sql5) === TRUE){
    //echo "Item updated successfully"."<br>";
} else{
    echo "Error : " . $con->error ;
}
if ($result = $con->query($sql6)) {
    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
    $YOURVote=$row["YourRate"];
    //echo "<br>".$YOURVote['YourRate']."<br>"."*****"."<br>";
}}  
//AVVote
if(`Counter`<1 ){
$sql7="UPDATE `civilarticle` SET `Rating`=($MyRate + (`Counter`-1)*`PastRate`)/`Counter`  WHERE ID=$ID";}
else{$sql7="UPDATE `civilarticle` SET  `Rating`= $MyRate WHERE `ID`=$ID";}
$sql8= "SELECT `Rating` FROM `civilarticle` WHERE `ID`=$ID";
if($con->query($sql7) === TRUE){
    //echo "Item inserted successfully"."<br>";
} else{
    echo "Error : " . $con->error ;
} 
if ($result = $con->query($sql8)) {
    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
    $AVVote=$row["Rating"];
    //echo "<br>".$row["Rating"]."<br>"."*****"."<br>";
}}

在下面的PHP代码中，我对它们进行了编码：

$arr=array("OldRate"=>$PASTVote,"YourRate"=>$YOURVote,"TotalRate"=>$AVVote,"CountVote"=>$COUNTVote);
json_encode($arr);

和我的Java类：

int ID=1; //put extra give me this value
public float Rate;
Button btn_submit,btn_detail;
RatingBar ratingbar;

String url= "mylink/android_login_api/rating.php";
TextView pastrate,yourrate,totalrate;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    txtTiltle = (TextView) findViewById(R.id.txtTitle);
    txtMain = (TextView) findViewById(R.id.txtMain);
    imgView = (ImageView) findViewById(R.id.imgView);
    ///
    btn_detail= (Button) findViewById(R.id.button2);
    pastrate= (TextView) findViewById(R.id.t1);
    yourrate=(TextView) findViewById(R.id.t2);
    totalrate=(TextView) findViewById(R.id.t3);
    ////
    Bundle extras = getIntent().getExtras();
    if (extras!=null){
        if(extras.containsKey("Title")){
            title = extras.getString("Title");
            txtTiltle.setText(title);
        }
    }
    ///my code for rating
    btn_submit= (Button) findViewById(R.id.button);
    ratingbar = (RatingBar) findViewById(R.id.ratingBar);
    btn_submit.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            Rate = ratingbar.getRating();
            Toast.makeText(DetailActivity.this,""+ratingbar.getRating(),Toast.LENGTH_SHORT).show();
            if(Rate!=-1){
                btn_submit.setEnabled(false);

            }
        }
    });

    btn_detail.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
             Toast.makeText(DetailActivity.this,url,Toast.LENGTH_SHORT).show();
            CustomRequest CustomRequest = new CustomRequest(Request.Method.GET, url, null,
                    new Response.Listener<JSONObject>() {
                        @Override
                        public void onResponse(JSONObject response) {
                            try {
                                pastrate.setText(response.getString("OldRate"));
                                yourrate.setText(response.getString("YourRate"));
                                totalrate.setText( response.getString("TotalRate"));
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                             Toast.makeText(DetailActivity.this,response+"",Toast.LENGTH_SHORT).show();
                        }
                    }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError volleyError) {
                    Log.e("ERROR", "Error occurred ", volleyError);
                    Toast.makeText(DetailActivity.this,"Failed",Toast.LENGTH_SHORT).show();
                    volleyError.printStackTrace();
                }
            })
            {
                    @Override
                    protected Map<String,String> getParams() {
                        Map<String, String> params = new HashMap<String, String>();
                        params.put("ID", String.valueOf(ID));
                        params.put("Rating",String.valueOf(Rate));
                        return params;
                    }
            };
            AppController.getInstance().addToRequestQueue(CustomRequest);
        }
    });

}

}

请帮助我...谢谢。。。

这是因为

在PHP中，您作为数组发送，而在Android客户端中，您作为对象进行读取。如果您想在 android 客户端中接收 Json 对象，请参阅以下示例

<?php
$myObj->name = "John";
$myObj->age = 30;
$myObj->city = "New York";
$myJSON = json_encode($myObj);
echo $myJSON;
?>

输出将如下所示

{"name":"John","age":30,"city":"New York"}

上述输出采用正确的 JSON 对象格式。

如果您希望以 Json 数组的形式接收，那么您应该在客户端以 JSON 数组的形式发送并读取为 JSON 数组。

我希望这会有所帮助

请参考下面以了解 JSON 应该如何在 PHP 端形成。

https://www.w3schools.com/js/js_json_php.asp

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