LogCat で次のエラーが発生します。
Error parsing data org.json.JSONException: Value of type java.lang.String cannot be converted to JSONArray
以下は、お見せできるすべてのファイルです。問題とその解決策を至急教えてください。私が推測することは次のとおりです。1.おそらく問題は、JSON配列のデータの解析にあります。2. 問題は私の php API にあるのかもしれません。json_encode を適切にエンコードしていないと思います。
以下のように
[{"uid":"120","name":"MyFirstName MyLastName"}]
また、1. Raw JSON と 2. Intented Json の両方の形式の動作に多少の違いがあることもお知らせください。
以下は意図したjson形式です
[
{
"uid":"120",
"name":"MyFirstName MyLastName"
}
]
ここに JSONUseActivity.java があります
package com.example.oncemore;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import com.example.oncemore.CustomHttpClient;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class JSONUseActivity extends Activity {
EditText email,password;
Button submit;
TextView tv; // TextView to show the result of MySQL query
String returnString; // to store the result of MySQL query after decoding
// JSON
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads().detectDiskWrites().detectNetwork() // StrictMode is
// most commonly
// used to catch
// accidental
// disk or
// network
// access on the
// application's
// main thread
.penaltyLog().build());
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jsonuse);
email = (EditText) findViewById(R.id.email);
password = (EditText) findViewById(R.id.password);
submit = (Button) findViewById(R.id.submitbutton);
tv = (TextView) findViewById(R.id.showresult);
// define the action when user clicks on submit button
submit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// declare parameters that are passed to PHP script i.e. the
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
// define the parameter
postParameters.add(new BasicNameValuePair("email",email.getText().toString()));
postParameters.add(new BasicNameValuePair("password",password.getText().toString()));
String response = null;
// call executeHttpPost method passing necessary parameters
try {
response = CustomHttpClient.executeHttpPost(
"http://mywebsite.com/android/api.php",
postParameters);
// store the result returned by PHP script that runs MySQL
// query
String result = response.toString();
// parse json data
try {
returnString = "";
//I think the line below is creating some problem
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag",
"id: " + json_data.getInt("uid")+", name: " + json_data.getString("name"));
// Get an output to the screen
returnString += "\n" + json_data.getString("name")
+ " -> " + json_data.getInt("uid");
}
}catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
try {
tv.setText(returnString);
}
catch (Exception e) {
Log.e("log_tag", "Error in Display!" + e.toString());
;
}
}
catch (Exception e) {
Log.e("log_tag",
"Error in http connection!!" + e.toString());
}
}
});
}
}
ここに CustomHttpClient.java があります
package com.example.oncemore;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import android.util.Log;
public class CustomHttpClient {
/** The time it takes for our client to timeout */
public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds
/** Single instance of our HttpClient */
private static HttpClient mHttpClient;
/**
* Get our single instance of our HttpClient object.
*
* @return an HttpClient object with connection parameters set
*/
private static HttpClient getHttpClient() {
if (mHttpClient == null) {
mHttpClient = new DefaultHttpClient();
final HttpParams params = mHttpClient.getParams();
HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT);
ConnManagerParams.setTimeout(params, HTTP_TIMEOUT);
}
return mHttpClient;
}
/**
* Performs an HTTP Post request to the specified url with the specified
* parameters.
*
* @param url
* The web address to post the request to
* @param postParameters
* The parameters to send via the request
* @return The result of the request
* @throws Exception
*/
public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpPost request = new HttpPost(url);
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
request.setEntity(formEntity);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
Log.e("log_tag", "Error converting result "+e.toString());
e.printStackTrace();
}
}
}
}
/**
* Performs an HTTP GET request to the specified url.
*
* @param url
* The web address to post the request to
* @return The result of the request
* @throws Exception
*/
public static String executeHttpGet(String url) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(url));
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity()
.getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
Log.e("log_tag", "Error converting result "+e.toString());
e.printStackTrace();
}
}
}
}
}
ここにapi.phpがあります
<?php
require_once("../contactdb.php");
$myusername=$_REQUEST["email"];
$mypassword=$_REQUEST["password"];
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT uid,name FROM u_info WHERE email='".$myusername."' AND password ='".$mypassword."'";
$result=mysql_query($sql);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
if($count==1){
while($row=mysql_fetch_assoc($result))
$output[]=$row;
echo json_encode($output);
mysql_close();
}else{
echo "Error Occured!";
}
?>
最後に、ブラウザに行ってこのように書くと
http://mywebsite.com/android/api.php?email=myname@yahoo.com&password=1234
このjson配列を取得しました!
[{"uid":"120","name":"MyFirstName MyLastName"}]
これまでグーグルで調べたところ、さまざまな形式のjson配列が見つかりました! 私はどこでも意図した Json を見つけました。私のjson配列は現在Raw Json形式です。Raw Json 形式を Intented Json 形式に変換する方法がどこにも見つかりません。
よろしくお願いします!どんな助けでも大歓迎です!できれば正しいコードを教えてください!