您好我正在开发一个使用mysql数据库的应用程序，但是当我尝试获取值并显示它时，我收到以下错误。
02-20 05:48:33.021: W/System.err(1723): org.json.JSONException: Value [{"3":"images\/BigBazaar.png","2":"Jayanagar 4th Block","outlet_name":"Big Bazaar","1":"Big Bazaar","0":"1","outlet_image":"images\/BigBazaar.png","outlet_location":"Jayanagar 4th Block","outlet_id":"1"}] of type org.json.JSONArray cannot be converted to JSONObject
我也能在日志中看到输出，即
02-20 05:48:33.380: I/TAG(1723): [{"0":"1","outlet_id":"1","1":"Big Bazaar","outlet_name":"Big Bazaar","2":"Jayanagar 4th Block","outlet_location":"Jayanagar 4th Block","3":"images\/BigBazaar.png","outlet_image":"images\/BigBazaar.png"}]
这是我的代码。
public class StoreActivity extends Activity {
private String mBaseUrl="http://192.168.1.5/Flutura/PHP/";
private String mDataUrl=mBaseUrl+"Core/Data/android.data3.php";
private String mAssetsUrl=mBaseUrl+"Assets/";
private String mRequest="outlet";
private String mOutletID="0";
private String mRecommendedProducts="";
private String mOutletDetails="";
private SharedPreferences myPrefs ;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.store);
myPrefs = this.getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
mOutletID = myPrefs.getString("outlet_id", "0");
mOutletDetails = myPrefs.getString("outlet_details","{}");
Log.v("outlet_details",myPrefs.getString("outlet_details","{}"));
if(mOutletDetails != "{}"){
setOutletData(mOutletDetails);
}
else{
executeAjaxRequest();
}
}
private void executeAjaxRequest(){
String url = mDataUrl+"?request="+mRequest+"&outlet_id="+mOutletID;
Log.v("url",url);
AsyncHttpClient httpclient = new AsyncHttpClient();
httpclient.get(url, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(String response) {
setOutletData(response);
Log.i("TAG",response);
}
});
}
private void setOutletData(String response){
try{
JSONObject store = new JSONObject(response);
ImageView store_avatar = (ImageView) findViewById(R.id.store_avatar);
TextView store_id = (TextView) findViewById(R.id.store_id);
TextView store_name = (TextView) findViewById(R.id.store_name);
TextView store_loc = (TextView) findViewById(R.id.store_location);
if(store_avatar != null){
/*
int resid;
resid = getApplicationContext().getResources().getIdentifier(store.getString("outlet_image").replaceAll(".png",""), "drawable", "org.flutura.recommendation");
store_avatar.setImageResource(resid);*/
ImageDownloader imdload = new ImageDownloader();
imdload.setMode(ImageDownloader.Mode.CORRECT);
imdload.download(mAssetsUrl+store.getString("outlet_image"),store_avatar );
mOutletDetails = store.toString();
mRecommendedProducts = store.getString("recommended_products");
store_avatar.setClickable(true);
store_avatar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent myIntent = new Intent(StoreActivity.this,StoreMapActivity.class);
SharedPreferences myPrefs = getApplicationContext().getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
SharedPreferences.Editor prefsEditor = myPrefs.edit();
prefsEditor.putString("outlet_details", mOutletDetails);
prefsEditor.commit();
startActivity(myIntent);
}
});
}
mOutletID = store.getString("outlet_id");
if(store_id != null){
store_id.setText(mOutletID);
}
if(store_name != null){
store_name.setText(store.getString("outlet_desc"));
}
if(store_loc != null){
store_loc.setText(store.getString("outlet_loc"));
}
Button recommended_products_button = (Button) findViewById(R.id.recommended_products_button);
recommended_products_button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
// Load the recommended products screen
Intent myIntent = new Intent(StoreActivity.this,RecommendedProductsListActivity.class);
SharedPreferences myPrefs = getApplicationContext().getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
SharedPreferences.Editor prefsEditor = myPrefs.edit();
prefsEditor.putString("outlet_id",mOutletID);
prefsEditor.putString("recommended_products", mRecommendedProducts);
prefsEditor.commit();
startActivity(myIntent);
}
});
Button category_wise_sales_button = (Button) findViewById(R.id.category_wise_sales_button);
category_wise_sales_button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
// Load the recommended products screen
Intent myIntent = new Intent(StoreActivity.this,CategoryWiseSalesActivity.class);
SharedPreferences myPrefs = getApplicationContext().getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
SharedPreferences.Editor prefsEditor = myPrefs.edit();
prefsEditor.putString("outlet_id",mOutletID);
prefsEditor.commit();
startActivity(myIntent);
}
});
}
catch(JSONException e){
e.printStackTrace();
}
catch(NullPointerException e){
e.printStackTrace();
}
}
}
这是我的PHP代码。
<?php
error_reporting(0);
//$url = $_GET['url'];
//$mR = $_GET['mRequest'];
$mOid = $_GET['mOutletId'];
//$mloc = $_GET['mLocation'];
//connect to the db
$user = "root";
$pswd = "";
$db = "recommendations_db";
$host = "localhost";
$conn = mysql_connect($host, $user, $pswd);
mysql_select_db($db);
//if($mR == 'outlets' && $mloc = 'all'){
$query = "SELECT outlet_id,outlet_name,outlet_location,outlet_image FROM outlets WHERE outlet_id = '$mOid'";
$result = mysql_query($query) or die("Unable to verify user because : " . mysql_error());
//while($row = mysql_fetch_array($result))
//{
$output[] = mysql_fetch_array($result);
//}
print( json_encode($output));
?>
任何人都可以告诉我出了什么问题，因为我的时间紧迫，需要今天完成。
搜索按钮代码。
search_button.setClickable(true);
search_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String outlet_no = outlet_id.getText().toString();
if(!outlet_no.isEmpty()){
@SuppressWarnings("deprecation")
SharedPreferences myPrefs = getApplicationContext().getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
SharedPreferences.Editor prefsEditor = myPrefs.edit();
prefsEditor.putString("outlet_id", outlet_no);
prefsEditor.commit();
Intent myIntent = new Intent(HomeActivity.this, StoreActivity.class);
startActivity(myIntent);
HomeActivity.this.startActivity(myIntent);
}
else{
Toast.makeText(getApplicationContext(), "Please enter an outlet id", Toast.LENGTH_SHORT);
}
}
});
答案 0 :(得分：3)
获取无法将jsonarray转换为json对象
因为你从服务器获取JSONArray而不是JSONObject所以只需通过将String转换为jsonArray来改变你的代码：
JSONArray jsonArr = new JSONArray(response); //<<< convert to jsonarray
// extract jsonObejct from JsonArray
JSONObject store = jsonArr.getJSONObject(0);
而不是
JSONObject store = new JSONObject(response);