Bir 8k-char tamponu gerekiyorsa açık olmak daha iyi olur. [HATA]

Question

Ben MySQL veritabanından veri gösteren bir ListView geliştiriyorum ama LogCat aşağıdaki hatayı alıyorum:

Bir 8k-Char tampon gerekiyorsa açık olması daha iyi olurdu.

Bu konuda bana yardımcı olan var mı?

07-16 03:49:16.388: I/global(391): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required.

Benim Java Kod

package com.database_demo; 
import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.List; 
import org.apache.http.HttpEntity; 
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.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.ListActivity; 
import android.net.ParseException; 
import android.os.Bundle; 
import android.widget.ArrayAdapter; 
import android.widget.Toast; 

public class Database_demo extends ListActivity { 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 

    String result = null; 
    InputStream is = null; 
    StringBuilder sb = null; 
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
    List<String> r = new ArrayList<String>(); 

    try{ 

    //http post 
    HttpClient httpclient = new DefaultHttpClient(); 
    HttpPost httppost = new HttpPost("http://192.168.0.2"); 
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
    HttpResponse response = httpclient.execute(httppost); 
    HttpEntity entity = response.getEntity(); 
    is = entity.getContent(); 
    } 
    catch(Exception e){ 
     Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show(); 
    } 

    //Convert response to string 
    try 
    { 
     BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8")); 

     sb = new StringBuilder(); 

     String line = null; 

     while ((line = reader.readLine()) != null) 
     { 
     sb.append(line + "\n"); 
     } 

     is.close(); 

     result = sb.toString(); 
    } 
    catch(Exception e) 
    { 
     Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show(); 
    } 
    //END Convert response to string 
    try{ 
      JSONArray jArray = new JSONArray(result); 
      JSONObject json_data=null; 
      for(int i=0;i<jArray.length();i++) 
      { 
       json_data = jArray.getJSONObject(i); 
       r.add(json_data.getString("category")); 
      } 
      setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, r)); 
     } 
     catch(JSONException e1){ 
      Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show(); 
     } catch (ParseException e1) { 
      Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show(); 
    } 

} 
} 

nullpointer exeption

07-16 04:02:28.708: D/AndroidRuntime(417): Shutting down VM 
07-16 04:02:28.708: W/dalvikvm(417): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
07-16 04:02:28.728: E/AndroidRuntime(417): FATAL EXCEPTION: main 
07-16 04:02:28.728: E/AndroidRuntime(417): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.database_demo/com.database_demo.Database_demo}: java.lang.NullPointerException 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.os.Looper.loop(Looper.java:123) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.ActivityThread.main(ActivityThread.java:4627) 
07-16 04:02:28.728: E/AndroidRuntime(417): at java.lang.reflect.Method.invokeNative(Native Method) 
07-16 04:02:28.728: E/AndroidRuntime(417): at java.lang.reflect.Method.invoke(Method.java:521) 
07-16 04:02:28.728: E/AndroidRuntime(417): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
07-16 04:02:28.728: E/AndroidRuntime(417): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
07-16 04:02:28.728: E/AndroidRuntime(417): at dalvik.system.NativeStart.main(Native Method) 
07-16 04:02:28.728: E/AndroidRuntime(417): Caused by: java.lang.NullPointerException 
07-16 04:02:28.728: E/AndroidRuntime(417): at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:112) 
07-16 04:02:28.728: E/AndroidRuntime(417): at org.json.JSONTokener.nextValue(JSONTokener.java:90) 
07-16 04:02:28.728: E/AndroidRuntime(417): at org.json.JSONArray.<init>(JSONArray.java:87) 
07-16 04:02:28.728: E/AndroidRuntime(417): at org.json.JSONArray.<init>(JSONArray.java:103) 
07-16 04:02:28.728: E/AndroidRuntime(417): at com.database_demo.Database_demo.onCreate(Database_demo.java:78) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
07-16 04:02:28.728: E/AndroidRuntime(417): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
07-16 04:02:28.728: E/AndroidRuntime(417): ... 11 more 

Answer 1

Değişim sonra bu satır:

İşte

LogCat içinde çizgidir Buna

BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8")); 

:

BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"), 8192); 

O mesaj Belki

Answer 2

sayfanızın sonucu kaldırmalısınız çok uzun:

Kullanım:

BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8192); 

yerine

BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8")); 

Dalvik message - Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required