Android异步任务获取错误

我刚从我的应用程序连接到互联网，所以我犯了这个错误，我的代码在下面

08-28 14:43:29.705: E/AndroidRuntime(17341): FATAL EXCEPTION: AsyncTask #1 08-28 14:43:29.705: E/AndroidRuntime(17341): java.lang.RuntimeException: An error occured while executing doInBackground() 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.os.AsyncTask$3.done(AsyncTask.java:200) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.lang.Thread.run(Thread.java:1019) 08-28 14:43:29.705: E/AndroidRuntime(17341): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.os.Handler.(Handler.java:121) 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.app.Dialog.(Dialog.java:101) 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.app.AlertDialog.(AlertDialog.java:63) 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.app.AlertDialog.(AlertDialog.java:59) 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.app.AlertDialog$Builder.create(AlertDialog.java:807) 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.app.AlertDialog$Builder.show(AlertDialog.java:822) 08-28 14:43:29.705: E/AndroidRuntime(17341): at com.makkuzu.gps.tracker.Main.UyariPencerem(Main.java:129) 08-28 14:43:29.705: E/AndroidRuntime(17341): at com.makkuzu.gps.tracker.Main.access$2(Main.java:124) 08-28 14:43:29.705: E/AndroidRuntime(17341): at com.makkuzu.gps.tracker.Main$SaveDataTask.doInBackground(Main.java:108) 08-28 14:43:29.705: E/AndroidRuntime(17341): at com.makkuzu.gps.tracker.Main$SaveDataTask.doInBackground(Main.java:1) 08-28 14:43:29.705: E/AndroidRuntime(17341): at android.os.AsyncTask$2.call(AsyncTask.java:185) 08-28 14:43:29.705: E/AndroidRuntime(17341): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 08-28 14:43:29.705: E/AndroidRuntime(17341): ... 4 more 和库拉尼奇康特罗

 private boolean KullaniciKontrol() {
    // TODO Auto-generated method stub
// http post
try {
    String result = "";
    ArrayList<NameValuePair> nameValPairs = new ArrayList<NameValuePair>();
    nameValPairs.add(new BasicNameValuePair("name", userName.getText().toString()));
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(
            "http://mywebsite.com/kullanici_kontrol.php");
    httppost.setEntity(new UrlEncodedFormEntity(nameValPairs));
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity entity = response.getEntity();
    InputStream is = entity.getContent();
    try {
        BufferedReader reader = new BufferedReader(
                new InputStreamReader(is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        result = sb.toString();
    } catch (Exception err) {
    }
    try {
        JSONArray jArray = new JSONArray(result);
        for (int i = 0; i < jArray.length(); i++) {
            JSONObject json_data = jArray.getJSONObject(i);
            String icerik = "Böyle bir kullanici zaten mevcut lütfen farklı bir kullanıcı adı deneyin.";
            UyariPencerem("Uyarı! ", icerik);
            return false;
        }
    } catch (JSONException er_json) {
    }
} catch (Exception er) {
}
return true;
}

感谢您的帮助……

此

UyariPencerem（“Uyarı！”，icerik）

显示一个警报对话框

UyariPencerem（“Uyarı！”，icerik）

被称为表单

doInbackground

doInbackground

在后台线程上调用。无法从

doInbackground

更新ui

返回

doinabcground

中的背景计算结果。

doInbackground

计算的结果是

onPostExecute

的一个参数。基于

onPostExecute

有关更多信息，请查看文档

您正在调用

UyariPencerem（“Uyarı！”，icerik）doInBackGround（）

的

catch块中的code>，它是工作线程。它正在执行UI操作（显示对话框），而您正在非UI线程中执行该操作。因此，我建议您使用

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            UyariPencerem("Uyarı! ",icerik);

                        }
                    });    

这有什么用呢？这是KullaniciKontrol（）

？张贴相同的代码。看起来您正在从线程更新ui如果您在

doInBackground

中操作ui，则将任务的doInBackground方法放入

runOnUiThread（…）

。。或者如果可能的话，在

onPostExecute

islemTamam（）中，这个

islemTamam（）中包含什么？我添加了Uyaripencerem（）KullaniciKontrol（）和islemTamam（），那么我该怎么做呢？@makkuzu返回
doInbackground
中的结果。在
onpostExecute
中接收并更新ui@makkuzu不客气。始终记住不要从
线程更新ui
或
异步任务doInbackground
如果asyctask不是活动类的内部类，则需要
runOnUiThread的活动上下文@makkuzu是活动类的内部类还是单独的类file@makkuzu，将发布的代码保留为引用，您必须使用它两次，一次用于islemTamam（）；在试块中，对于UyariPencerem（“Uyarı！”，icerik）；在doInBackground（）的catch块中。
 private boolean KullaniciKontrol() {
    // TODO Auto-generated method stub
// http post
try {
    String result = "";
    ArrayList<NameValuePair> nameValPairs = new ArrayList<NameValuePair>();
    nameValPairs.add(new BasicNameValuePair("name", userName.getText().toString()));
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(
            "http://mywebsite.com/kullanici_kontrol.php");
    httppost.setEntity(new UrlEncodedFormEntity(nameValPairs));
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity entity = response.getEntity();
    InputStream is = entity.getContent();
    try {
        BufferedReader reader = new BufferedReader(
                new InputStreamReader(is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        result = sb.toString();
    } catch (Exception err) {
    }
    try {
        JSONArray jArray = new JSONArray(result);
        for (int i = 0; i < jArray.length(); i++) {
            JSONObject json_data = jArray.getJSONObject(i);
            String icerik = "Böyle bir kullanici zaten mevcut lütfen farklı bir kullanıcı adı deneyin.";
            UyariPencerem("Uyarı! ", icerik);
            return false;
        }
    } catch (JSONException er_json) {
    }
} catch (Exception er) {
}
return true;
}

          private void islemTamam() {

    Builder uyariPenceresi = new AlertDialog.Builder(this);
    uyariPenceresi.setTitle("İşlem Tamam! ");
    uyariPenceresi.setMessage("Bilgiler başarıyla kaydedilmiştir. \nKullanıcı adınız :" + userName.getText().toString() + "\nşifreniz:"+ passOne.getText().toString()+ "\nTelefon konumunuzu öğrenmek için \ntelefonumnerede.makkuzu.com web sitesini ziyaret ediniz. ");
    uyariPenceresi.setCancelable(true);
    uyariPenceresi.setPositiveButton("Tamam",new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int id) {
            someData=getSharedPreferences(filename,0);
            Editor myEditor=someData.edit();
            myEditor.putString("name", userName.getText().toString()); 
            myEditor.putBoolean("isFirtsTime", false); 
            myEditor.commit();
            startService(new Intent(Main.this, GPSService.class));
            Main.this.finish();
        }
      });
        uyariPenceresi.show();


}

Can't create handler inside thread that has not called Looper.prepare()

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            UyariPencerem("Uyarı! ",icerik);

                        }
                    });