我正在使用mysql来获取JSON中的数据，但是当我在url中传递值时，我得到JSON token error in Android。
我不知道我在哪里弄错了。
我的Logcat
09-24 08:35:03.513: E/AndroidRuntime(4276): Process: com.pitechnologies.progresscard, PID: 4276
09-24 08:35:03.513: E/AndroidRuntime(4276): java.lang.NullPointerException
09-24 08:35:03.513: E/AndroidRuntime(4276): at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
09-24 08:35:03.513: E/AndroidRuntime(4276): at org.json.JSONTokener.nextValue(JSONTokener.java:94)
09-24 08:35:03.513: E/AndroidRuntime(4276): at org.json.JSONArray.<init>(JSONArray.java:92)
09-24 08:35:03.513: E/AndroidRuntime(4276): at org.json.JSONArray.<init>(JSONArray.java:108)
09-24 08:35:03.513: E/AndroidRuntime(4276): at com.pitechnologies.progresscard.Messages2.showList(Messages2.java:138)
09-24 08:35:03.513: E/AndroidRuntime(4276): at com.pitechnologies.progresscard.Messages2$1GetDataJSON.onPostExecute(Messages2.java:215)
09-24 08:35:03.513: E/AndroidRuntime(4276): at com.pitechnologies.progresscard.Messages2$1GetDataJSON.onPostExecute(Messages2.java:1)
09-24 08:35:03.513: E/AndroidRuntime(4276): at android.os.AsyncTask.finish(AsyncTask.java:632)
09-24 08:35:03.513: E/AndroidRuntime(4276): at android.os.AsyncTask.access$600(AsyncTask.java:177)
09-24 08:35:03.513: E/AndroidRuntime(4276): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
09-24 08:35:03.513: E/AndroidRuntime(4276): at android.os.Handler.dispatchMessage(Handler.java:102)
09-24 08:35:03.513: E/AndroidRuntime(4276): at android.os.Looper.loop(Looper.java:136)
09-24 08:35:03.513: E/AndroidRuntime(4276): at android.app.ActivityThread.main(ActivityThread.java:5001)
09-24 08:35:03.513: E/AndroidRuntime(4276): at java.lang.reflect.Method.invokeNative(Native Method)
09-24 08:35:03.513: E/AndroidRuntime(4276): at java.lang.reflect.Method.invoke(Method.java:515)
09-24 08:35:03.513: E/AndroidRuntime(4276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
09-24 08:35:03.513: E/AndroidRuntime(4276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
09-24 08:35:03.513: E/AndroidRuntime(4276): at dalvik.system.NativeStart.main(Native Method)
MainActivity
public class Messages2 extends Activity {
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private EditText editTextName;
SharedPreferences sp;
private String jsonResult;
private ListView listView;
private Button b;
EditText etname, et;
TextView tv;
String myJSON;
private static final String TAG_RESULTS="result";
private static final String TAG_USERNAME = "username";
private static final String TAG_NAME = "message_recd";
private static final String TAG_ADD ="message_sent";
JSONArray peoples = null;
ArrayList<HashMap<String, String>> personList;
ListView list;
public static final String USER_NAME = "USERNAME";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
InputStream is = null;
// http post
Intent intent1 = getIntent();
String fName = intent1.getStringExtra("fname");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("username",fName));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/progress_card/testing.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
}
setContentView(R.layout.activity_second);
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
// load icons from
// strings.xml
b=(Button)findViewById(R.id.Button01);
list = (ListView) findViewById(R.id.listView);
personList = new ArrayList<HashMap<String,String>>();
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = getIntent();
String fName = intent.getStringExtra("fname");
getData(fName);
}
});
}
protected void showList(){
try {
HashMap<String,String> person = new HashMap<String,String>();
Intent intent1 = getIntent();
String fName = intent1.getStringExtra("fname");
person.put(TAG_NAME,fName);
JSONArray peoples = new JSONArray(myJSON);
for(int i=0;i<peoples.length();i++){
JSONObject c = peoples.getJSONObject(i);
String name=null, address=null;
if(c.has("message_recd"))
name = c.getString("message_recd");
else if(c.has("message_sent"))
address = c.getString("message_sent");
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_NAME,name);
persons.put(TAG_ADD,address);
personList.add(persons);
}
ListAdapter adapter = new SimpleAdapter(
Messages2.this, personList, R.layout.list_item,
new String[]{TAG_NAME,TAG_ADD},
new int[]{R.id.name, R.id.address}
);
list.setAdapter(adapter);
} catch (JSONException e) {
Log.i("tagconvertstr", "["+myJSON+"]");
}
}
public void getData(String fName){
class GetDataJSON extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
String paramUsername = params[0];
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://10.0.2.2/progress_card/testing.php");
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
Intent intent1 = getIntent();
String fName = intent1.getStringExtra("fname");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("username",fName));
try{
HttpClient httpclient1 = new DefaultHttpClient();
HttpPost httppost1 = new HttpPost("http://10.0.2.2/progress_card/testing.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
Log.i("tagconvertstr", "["+result+"]");
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
@Override
protected void onPostExecute(String result){
myJSON=result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute(fName);
}
}