我的代碼不會的AsyncTask

工作

我是新來的Android，我不熟悉使用的AsyncTask，我進行登錄到我的web服務，但它試圖讀取就行了我的代碼不會的AsyncTask

InputStream in = urlConnection.getInputStream();

InputStream的失敗這裏是我的代碼：

package com.test.connector; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.Authenticator; 
import java.net.MalformedURLException; 
import java.net.PasswordAuthentication; 
import java.net.URL; 
import java.security.KeyManagementException; 
import java.security.KeyStore; 
import java.security.KeyStoreException; 
import java.security.NoSuchAlgorithmException; 
import java.security.cert.Certificate; 
import java.security.cert.CertificateException; 
import java.security.cert.CertificateFactory; 

import javax.net.ssl.HttpsURLConnection; 
import javax.net.ssl.SSLContext; 
import javax.net.ssl.TrustManagerFactory; 

import android.content.Context; 
import android.os.AsyncTask; 

public class TestConnection extends AsyncTask<String, String, String> { 

static InputStream firstCertificate = null; 
static InputStream secondCertificate = null; 
static InputStream thirdCertificate = null; 

private static String htmlString; 

public void passCertificates(Context c){ 
    c.getAssets(); 

    try { 
     firstCertificate = c.getAssets().open("certificate1.crt"); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    try { 
     secondCertificate=c.getAssets().open("certificate2.crt"); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    try { 
     thirdCertificate=c.getAssets().open("certificate3"); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 

@Override 
protected String doInBackground(String... params) { 
    String webHtmlData=null; 

    String inpUrl=params[0]; 
    final String username=params[1]; 
    final String password=params[2]; 

    CertificateFactory cf = null; 
    try { 
     cf = CertificateFactory.getInstance("X.509"); 
    } catch (CertificateException e) { 
     e.printStackTrace(); 
    } 

    Certificate ca1 = null; 
    Certificate ca2 = null; 
    Certificate ca3 = null; 
    try { 
     ca1 = cf.generateCertificate(firstCertificate); 
     ca2 = cf.generateCertificate(secondCertificate); 
     ca3 = cf.generateCertificate(thirdCertificate); 
    } catch (CertificateException e) { 
     e.printStackTrace(); 
    } 
    finally { 
     try { 
      firstCertificate.close(); 
      secondCertificate.close(); 
      thirdCertificate.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    // Create a KeyStore containing our trusted CAs 
    String keyStoreType = KeyStore.getDefaultType(); 
    KeyStore keyStore = null; 
    try { 
     keyStore = KeyStore.getInstance(keyStoreType); 
    } catch (KeyStoreException e) { 
     e.printStackTrace(); 
    } 
    try { 
     keyStore.load(null, null); 
    } catch (NoSuchAlgorithmException e) { 
     e.printStackTrace(); 
    } catch (CertificateException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    try { 
     keyStore.setCertificateEntry("ca1", ca1); 
    } catch (KeyStoreException e) { 
     e.printStackTrace(); 
    } 
    try { 
     keyStore.load(null, null); 
    } catch (NoSuchAlgorithmException e) { 
     e.printStackTrace(); 
    } catch (CertificateException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    try { 
     keyStore.setCertificateEntry("ca2", ca2); 
    } catch (KeyStoreException e) { 
     e.printStackTrace(); 
    } 
    try { 
     keyStore.load(null, null); 
    } catch (NoSuchAlgorithmException e) { 
     e.printStackTrace(); 
    } catch (CertificateException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    try { 
     keyStore.setCertificateEntry("ca3", ca3); 
    } catch (KeyStoreException e) { 
     e.printStackTrace(); 
    } 

    // Create a TrustManager that trusts the CAs in our KeyStore 
    String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm(); 
    TrustManagerFactory tmf = null; 
    try { 
     tmf = TrustManagerFactory.getInstance(tmfAlgorithm); 
    } catch (NoSuchAlgorithmException e) { 
     e.printStackTrace(); 
    } 
    try { 
     tmf.init(keyStore); 
    } catch (KeyStoreException e) { 
     e.printStackTrace(); 
    } 

    // Create an SSLContext that uses our TrustManager 
    SSLContext context = null; 
    try { 
     context = SSLContext.getInstance("TLS"); 
    } catch (NoSuchAlgorithmException e) { 
     e.printStackTrace(); 
    } 
    try { 
     context.init(null, tmf.getTrustManagers(), null); 
    } catch (KeyManagementException e) { 
     e.printStackTrace(); 
    } 

    //authentication credentials 
    Authenticator myAuth = new Authenticator() 
    { 
     @Override 
     protected PasswordAuthentication getPasswordAuthentication() 
     { 
      return new PasswordAuthentication(username, password.toCharArray()); 
     } 
    }; 
    Authenticator.setDefault(myAuth); 

    // Tell the URLConnection to use a SocketFactory from our SSLContext 
    URL url = null; 
    try { 
     url = new URL(inpUrl); 
    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } 
    HttpsURLConnection urlConnection = null; 
    try { 
     urlConnection = (HttpsURLConnection)url.openConnection(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    urlConnection.setSSLSocketFactory(context.getSocketFactory()); 
    try { 
     InputStream in = urlConnection.getInputStream();// my code fails here 
     webHtmlData=readStream(in); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    return webHtmlData; 
} 

public String readStream(InputStream in) { 

    StringBuilder response = null; 
    try { 
     BufferedReader is = 
       new BufferedReader(new InputStreamReader(in)); 
     String inputLine; 
     response = new StringBuilder(); 
     while ((inputLine = is.readLine()) != null) { 
      response.append(inputLine); 
     } 
     is.close(); 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
    } 
    return response.toString(); 
}

我通過在mainActivity類使用以下命令執行doInBackground

TestConnection tc=new TestConnection; 
tc.passCertificates(this); 
String[] param[]={"example.com","username","password"} 
tc.doInBackground(param);

，但是沒有asyncTask的代碼可以用作java應用程序。

，這裏是我的logcat

04-26 07:30:03.535: D/dalvikvm(1446): GC_FOR_ALLOC freed 37K, 4% free 2949K/3064K, paused 47ms, total 50ms 
04-26 07:30:03.535: I/dalvikvm-heap(1446): Grow heap (frag case) to 3.558MB for 635812-byte allocation 
04-26 07:30:03.585: D/dalvikvm(1446): GC_FOR_ALLOC freed 2K, 4% free 3567K/3688K, paused 40ms, total 40ms 
04-26 07:30:03.935: W/System.err(1446): android.os.NetworkOnMainThreadException 
04-26 07:30:03.945: W/System.err(1446):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145) 
04-26 07:30:03.945: W/System.err(1446):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
04-26 07:30:03.955: W/System.err(1446):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
04-26 07:30:03.955: W/System.err(1446):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
04-26 07:30:03.955: W/System.err(1446):  at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28) 
04-26 07:30:03.955: W/System.err(1446):  at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:179) 
04-26 07:30:03.965: W/System.err(1446):  at com.android.okhttp.internal.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:246) 
04-26 07:30:03.965: W/System.err(1446):  at com.ovid.connector.Connector.downloadWebData(Connector.java:209) 
04-26 07:30:03.965: W/System.err(1446):  at com.ovid.connector.Connector.doInBackground(Connector.java:245) 
04-26 07:30:03.965: W/System.err(1446):  at com.ovid.connector.Connector.connectAndGetHtmlData(Connector.java:48) 
04-26 07:30:03.965: W/System.err(1446):  at com.ovid.expandablelistview.MainActivity.onCreate(MainActivity.java:70) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.Activity.performCreate(Activity.java:5231) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
04-26 07:30:03.965: W/System.err(1446):  at android.os.Handler.dispatchMessage(Handler.java:102) 
04-26 07:30:03.965: W/System.err(1446):  at android.os.Looper.loop(Looper.java:136) 
04-26 07:30:03.965: W/System.err(1446):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
04-26 07:30:03.995: W/System.err(1446):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-26 07:30:03.995: W/System.err(1446):  at java.lang.reflect.Method.invoke(Method.java:515) 
04-26 07:30:03.995: W/System.err(1446):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
04-26 07:30:03.995: W/System.err(1446):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
04-26 07:30:03.995: W/System.err(1446):  at dalvik.system.NativeStart.main(Native Method) 
04-26 07:30:04.035: D/AndroidRuntime(1446): Shutting down VM 
04-26 07:30:04.035: W/dalvikvm(1446): threadid=1: thread exiting with uncaught exception (group=0xb2ae0ba8) 
04-26 07:30:04.055: E/AndroidRuntime(1446): FATAL EXCEPTION: main 
04-26 07:30:04.055: E/AndroidRuntime(1446): Process: com.example.expandablelistview, PID: 1446 
04-26 07:30:04.055: E/AndroidRuntime(1446): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.expandablelistview/com.ovid.expandablelistview.MainActivity}: java.lang.IllegalArgumentException: String input must not be null 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.os.Handler.dispatchMessage(Handler.java:102) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.os.Looper.loop(Looper.java:136) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at java.lang.reflect.Method.invoke(Method.java:515) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at dalvik.system.NativeStart.main(Native Method) 
04-26 07:30:04.055: E/AndroidRuntime(1446): Caused by: java.lang.IllegalArgumentException: String input must not be null 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at org.jsoup.helper.Validate.notNull(Validate.java:26) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at org.jsoup.parser.TreeBuilder.initialiseParse(TreeBuilder.java:24) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at org.jsoup.parser.TreeBuilder.parse(TreeBuilder.java:40) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at org.jsoup.parser.HtmlTreeBuilder.parse(HtmlTreeBuilder.java:54) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at org.jsoup.parser.Parser.parse(Parser.java:90) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at org.jsoup.Jsoup.parse(Jsoup.java:58) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at com.ovid.utils.ListProvider.getJournalName(ListProvider.java:15) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at com.ovid.expandablelistview.MainActivity.onCreate(MainActivity.java:73) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.Activity.performCreate(Activity.java:5231) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
04-26 07:30:04.055: E/AndroidRuntime(1446):  ... 11 more

來源

2014-04-26 user3556095

而不是調用'tc.doInBackground（）'，調用'tc.execute（）'，這將在單獨的線程中調用'doInBackground（）'方法。 – nKn

參考這個[link]（http://www.androidhive.info/2012/01/android-json-parsing-tutorial/）將幫助你使用'AsyncTask'調用'WS' .. – Akshay

你可以發佈你的logcat嗎？ –

超載的AsyncTaskonPostExecute方法。並呼籲tc.execute()而不是tc.doInBackground()：

@Override 
protected void onPostExecute(Void result) { 
     //Move your code of reading inputStream here 
}

電話doInBackground和onPostEcecute被調用。

來源

2014-04-26 11:10:27

是否必須將doInBackground的輸出傳遞給onPostExecute或者它是自動完成的？ – user3556095

不要傳遞任何輸出。把它變成一個類變量。 –

試試這個..

new TestConnection().execute();

來源

2014-04-26 11:00:45 Giridharan

我也試過，但它仍然無法讀取inputStream – user3556095

什麼錯誤顯示 – Giridharan

java.lang.RuntimeException：無法啓動活動ComponentInfo {com.example。 expandablelistview/com.ovid.expandablelistview.MainActivity}：android.os.NetworkOnMainThreadException – user3556095

new TestConnection().execute(params);

和延長線，

AsyncTask<String[],Void,String>

來源

2014-04-26 11:06:32

試過，也沒有運氣 – user3556095

我的代碼不會的AsyncTask

回答

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