監控網絡帶寬的問題

我明白這個問題已被多次詢問，但其他解決方案似乎並沒有幫助我，因爲我的代碼非常具體。我試圖監視我的網絡帶寬和質量，並且我已經查看了有關如何在StackOverflow上執行此操作的示例代碼。監控網絡帶寬的問題

以下是我有什麼（很多是由成員SO資），在我MainActivity.java類：

public class MainActivity extends Activity { 

@SuppressLint("NewApi") 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    final String TAG = "test"; 
    long startTime; 
    long endTime; 
    BufferedHttpEntity bufHttpEntity; 
    float bandwidth; 
    try { 
     startTime = System.currentTimeMillis(); 
     String urlString = "http://www.google.com"; 
     HttpGet httpRequest = new HttpGet(new URL(urlString).toURI()); 
     HttpClient httpClient = new DefaultHttpClient(); 
     HttpResponse response = (HttpResponse) httpClient.execute(httpRequest); 
     endTime = System.currentTimeMillis(); 

     HttpEntity entity = response.getEntity(); 
     bufHttpEntity = new BufferedHttpEntity(entity); 
     //You can re-check the size of your file 
     final long contentLength = bufHttpEntity.getContentLength(); 

     // Log 
     Log.d(TAG, "[BENCHMARK] Dowload time :"+(endTime-startTime)+" ms"); 

     // Bandwidth : size(KB)/time(s) 
     System.out.println("here"); 
     bandwidth = contentLength/((endTime-startTime) *1000); 
    } catch (MalformedURLException e) { 
     // TODO Auto-generated catch block 
     bandwidth = -1; 
     e.printStackTrace(); 
    } catch (ClientProtocolException e) { 
     // TODO Auto-generated catch block 
     bandwidth = -1; 
     e.printStackTrace(); 
    } catch (URISyntaxException e) { 
     // TODO Auto-generated catch block 
     bandwidth = -1; 
     e.printStackTrace(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     bandwidth = -1; 
     e.printStackTrace(); 
    }  

    int linkSpeed; 
    WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
    WifiInfo wifiInfo = wifiManager.getConnectionInfo(); 
    if (wifiInfo != null) { 
     linkSpeed = wifiInfo.getLinkSpeed(); //measured using WifiInfo.LINK_SPEED_UNITS 
    } 
    else { 
     linkSpeed = -1; 
    } 

    // Create the text view 
    TextView textView = new TextView(this); 
    textView.setTextSize(25); 
    textView.setText("Linkspeed = " + linkSpeed + "\nbandwidth = " + bandwidth); 

    // Set the text view as the activity layout 
    setContentView(textView); 
} 


//Set up the {@link android.app.ActionBar}, if the API is available. 
@TargetApi(Build.VERSION_CODES.HONEYCOMB) 
private void setupActionBar() { 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { 
     getActionBar().setDisplayHomeAsUpEnabled(true); 
    } 
}

我已經做了錯誤檢查，我發現兩個問題。

呼叫「WifiInfo wifiInfo = wifiManager.getConnectionInfo（）」導致「不幸的是，XXX已經停止」的錯誤，導致我的模擬器崩潰。我似乎無法解決這個問題。我不認爲我需要拋出一個try-catch塊......？
當我在urlString中輸入一個網站時，發生類似的「不幸的是，xxx已停止」錯誤。當我將該字段留空時，帶寬變爲-1，因爲沒有指定網站，並拋出異常。

06-26 19:10:15.164: D/AndroidRuntime(2402): Shutting down VM 
06-26 19:10:15.203: W/dalvikvm(2402): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 
06-26 19:10:15.244: E/AndroidRuntime(2402): FATAL EXCEPTION: main 
06-26 19:10:15.244: E/AndroidRuntime(2402): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.networkinfo/com.example.networkinfo.MainActivity}: android.os.NetworkOnMainThreadException 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.os.Looper.loop(Looper.java:137) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at java.lang.reflect.Method.invoke(Method.java:511) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at dalvik.system.NativeStart.main(Native Method) 
06-26 19:10:15.244: E/AndroidRuntime(2402): Caused by: android.os.NetworkOnMainThreadException 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at com.example.networkinfo.MainActivity.onCreate(MainActivity.java:46) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.Activity.performCreate(Activity.java:5104) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
06-26 19:10:15.244: E/AndroidRuntime(2402):  ... 11 more

來源

2013-06-26 Yuen Hsi

發佈logcat stacktrace –

發佈，希望有所幫助。 –

顯而易見'由android.os.NetworkOnMainThreadException'引起的，你不能在MainThread上做網絡操作。 –

呼叫「WifiInfo wifiInfo = wifiManager.getConnectionInfo（）」導致「不幸的是，XXX已經停止」的錯誤，導致我的模擬器崩潰。我似乎無法解決這個問題。我不認爲我需要拋出一個try-catch塊......？

這是什麼logcat？可能：您的應用有ACCESS_NETWORK_STATE權限？

當我在urlString中輸入一個網站時，會出現一個類似的「不幸的是，xxx已停止」錯誤。當我將該字段留空時，帶寬變爲-1，因爲沒有指定網站，並拋出異常。

不要在UI線程上進行網絡操作。簡單的解決方案是使用AsyncTask在後臺線程上執行它們。欲瞭解更多信息：How to fix android.os.NetworkOnMainThreadException?

來源

2013-06-27 09:17:19 laalto

非常感謝，這非常有幫助。我確實忘了提供許可，而且我必須創建一個輔助線程來檢索linkSpeed。我沒有看AsyncTask，但現在我會這樣做。 –

監控網絡帶寬的問題

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