從android應用獲取網站的HTML代碼

Question

我正在開發我的第一個android應用程序。

我嘗試從網站獲得的HTML源代碼，我用這個代碼：

HttpClient client = new DefaultHttpClient(); 
    HttpGet request = new HttpGet(urlWeb); 
    HttpResponse response = client.execute(request); 

    String html = ""; 
    InputStream in = response.getEntity().getContent(); 
    BufferedReader reader = new BufferedReader(new InputStreamReader(in)); 
    StringBuilder str = new StringBuilder(); 
    String line = null; 
    while((line = reader.readLine()) != null) 
    { 
     str.append(line); 
    } 
    in.close(); 
    html = str.toString(); 

此外，我添加權限在清單互聯網。

但總是得到這樣的錯誤：

05-02 18:56:56.967: E/AndroidRuntime(17659): FATAL EXCEPTION: main 
05-02 18:56:56.967: E/AndroidRuntime(17659): java.lang.IllegalStateException: Could not execute method of the activity 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.view.View$1.onClick(View.java:3597) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.view.View.performClick(View.java:4202) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.view.View$PerformClick.run(View.java:17340) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.os.Handler.handleCallback(Handler.java:725) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.os.Handler.dispatchMessage(Handler.java:92) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.os.Looper.loop(Looper.java:137) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.app.ActivityThread.main(ActivityThread.java:5191) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.lang.reflect.Method.invokeNative(Native Method) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.lang.reflect.Method.invoke(Method.java:511) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at dalvik.system.NativeStart.main(Native Method) 
05-02 18:56:56.967: E/AndroidRuntime(17659): Caused by: java.lang.reflect.InvocationTargetException 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.lang.reflect.Method.invokeNative(Native Method) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.lang.reflect.Method.invoke(Method.java:511) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.view.View$1.onClick(View.java:3592) 
05-02 18:56:56.967: E/AndroidRuntime(17659): ... 11 more 
05-02 18:56:56.967: E/AndroidRuntime(17659): Caused by: android.os.NetworkOnMainThreadException 
05-02 18:56:56.967: E/AndroidRuntime(17659): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at java.net.InetAddress.getAllByName(InetAddress.java:214) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
05-02 18:56:56.967: E/AndroidRuntime(17659): at com.example.icpcgb.MainActivity.btn_Show(MainActivity.java:72) 

至極可能是問題？

非常感謝您

Answer 1

Caused by: android.os.NetworkOnMainThreadException

您試圖執行的UI線程網絡操作，機器人3+設備不允許在UI線程網絡操作。因此，它會拋出NetworkOnMainThreadException，所以使用AsyncTask或獨立thread執行網絡操作