正在尝试使用json将简单的应用程序从mysql加载到android。
这是我的PHP代码:java.lang.String类型的值无法转换为JSONArray
$response = array();
$result = mysql_query("SELECT * FROM Demo LIMIT 2");
if(mysql_num_rows($result) !=0)
{
while($row = mysql_fetch_array($result)){
array_push($response, new Image(
$row["id"],
$row["name"],
$row["image"]
));
}
echo json_encode($response);
}
class Image
{
var $id;
var $name;
var $link1;
function Image($id, $name, $link1)
{
$this->id = $id;
$this->name = $name;
$this->link1 = $link1;
}
}
结果JSON:
[{ “ID”: “1”, “名”: “thisisname”, “链接1”: “thisislink”} ,{ “ID”: “2”, “名称”: “thisisname”, “LINK1”: “thisislink”}]
这是机器人代码:
class getDetailProduct extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... strings) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://10.0.3.2/demo/display.php");
String kq = "";
try {
HttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
kq = EntityUtils.toString(entity);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return kq;
}
@Override
protected void onPostExecute(String s) {
Log.e("result", s);
try {
JSONArray jsarr = new JSONArray(s); // Error this line
if(jsarr.length()>0){
for (int i = 0; i<jsarr.length(); i++){
JSONObject jo = jsarr.getJSONObject(i);
imageArrayList.add(new MyImage(
jo.getInt("id"),
jo.getString("name"),
jo.getString("link1")
));
}
MyGridViewAdapter myGridViewAdapter = new MyGridViewAdapter(getApplicationContext(), R.layout.item_gridview, imageArrayList);
gridView.setAdapter(myGridViewAdapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
这是logcat的:
20:22:57.055 12905-12905/com.example.chientran.demoproject E/result: [{"id":"1","name":"thisisname","link1":"thisislink"},{"id":"2","name":"thisisname","link1":"thisislink"}]
W/System.err: org.json.JSONException: Value of type java.lang.String cannot be converted to JSONArray
W/System.err: at org.json.JSON.typeMismatch(JSON.java:111)
W/System.err: at org.json.JSONArray.<init>(JSONArray.java:96)
W/System.err: at org.json.JSONArray.<init>(JSONArray.java:108)
W/System.err: at com.example.chientran.demoproject.MainActivity$getDetailProduct.onPostExecute(MainActivity.java:93)
W/System.err: at com.example.chientran.demoproject.MainActivity$getDetailProduct.onPostExecute(MainActivity.java:57)
W/System.err: at android.os.AsyncTask.finish(AsyncTask.java:632)
W/System.err: at android.os.AsyncTask.access$600(AsyncTask.java:177)
W/System.err: at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
W/System.err: at android.os.Looper.loop(Looper.java:135)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5221)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
但是,如果使用hardjson,它的工作
String ss= "[{\"id\":\"1\",\"name\":\"thisisname\",\"link1\":\"thisislink\"},{\"id\":\"2\",\"name\":\"thisisname\",\"link1\":\"thisislink\"}]";
JSONArray jsonarr = new JSONArray(ss);// It work
`
嗨,onPostExecute,我有PHP的结果json。所以我认为'kq'不是空的。 – Chien
如果Log.e(“result”,s)显示上面发布的响应,那么除了jo.getInt(“id”)部分,我认为代码没有任何问题。你的id是以字符串形式而不是int。检查日志是否显示结果。 –
@NishanKhadka'jo.getInt(“id”)'因为在模型'MyImage(int id,String name,String link)'中。 – Chien