Android。如何讓移動互聯網（數據網絡）開啓/關閉狀態？

Question

我想創建這樣的按鈕（如果移動網絡已打開它是綠色的，當它是關閉的，它是灰色的）：

我試圖用這個方法來識別狀態：

public Boolean isDataNetworkEnabled() { 

    ConnectivityManager conMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); 

    if (conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
      || conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING) { 
     return true; 
    } 

    if (conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED 
      || conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED) { 
     return false; 
    } 

    return false; 
} 

它總是返回值'false'。即使在移動網絡打開之後。其實，如何識別移動網絡的狀態呢？

PS。我不是在問如何打開/關閉移動網絡，我是在問狀態。我已經找到了如何開啓/關閉：

try { 
        Method dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class); 
        if (!isDataNetworkEnabled()) { 
         dataMtd.invoke(dataManager, true); 
         ivDataNetwork.setImageResource(R.drawable.ic_data_usage_black_48dp); 
         Toast.makeText(context, "Data network turned on", Toast.LENGTH_SHORT).show(); 
        } else { 
         dataMtd.invoke(dataManager, false); 
         ivDataNetwork.setImageResource(R.drawable.ic_data_usage_grey600_48dp); 
         Toast.makeText(context, "Data network turned off", Toast.LENGTH_SHORT).show(); 
        } 
       } catch (InvocationTargetException e) { 
        e.printStackTrace(); 
       } catch (IllegalAccessException e) { 
        e.printStackTrace(); 
       } catch (NoSuchMethodException e) { 
        e.printStackTrace(); 
       } 

Answer 1

最佳做法是在manifest.xml中使用廣播接收器

註冊reciever下

<receiver android:name="com.example.broadcastreciever2.NetworkChangeReciever" > 
      <intent-filter> 
       <action android:name="android.net.conn.CONNECTIVITY_CHANGE" /> 
      </intent-filter> 
     </receiver> 

另外補充

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.INTERNET" /> 

定義您的接收器（根據您的使用使用）

import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.widget.Toast; 

public class NetworkChangeReciever extends BroadcastReceiver { 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     // TODO Auto-generated method stub 

     if (checkInternet(context)) { 
      Toast.makeText(context, "Network Available Do operations", 
        Toast.LENGTH_LONG).show(); 
     } 

    } 

    boolean checkInternet(Context context) { 
     ServiceManager serviceManager = new ServiceManager(context); 
     if (serviceManager.isNetworkAvailable()) { 
      return true; 
     } else { 
      return false; 
     } 
    } 

} 

定義的ServiceManager通過延長ContextWrapper

import android.content.Context; 
import android.content.ContextWrapper; 
import android.net.ConnectivityManager; 
import android.net.NetworkInfo; 

public class ServiceManager extends ContextWrapper { 

public ServiceManager(Context base) { 
    super(base); 
} 

public boolean isNetworkAvailable() { 
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo networkInfo = cm.getActiveNetworkInfo(); 
    if (networkInfo != null && networkInfo.isConnected()) { 
     return true; 
    } 
    return false; 
} 

} 

Answer 2

更換一些值...

if (conMgr.getNetworkInfo(TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED 
      || conMgr.getNetworkInfo(TYPE_WIFI).getState() == NetworkInfo.State.CONNECTING) { 
     return true; 
    } 

    if (conMgr.getNetworkInfo(TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED 
      || conMgr.getNetworkInfo(TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) { 
     return false; 
    } 

所以，你真的檢查，如果移動數據連接，或WiFi正在連接。這聽起來像你不想wifi，所以改變TYPE_WIFI到TYPE_MOBILE？

事實上，它可能會稍微好做：

public boolean isMobileDataNetworkAccessable() { 
    return conMgr.getNetworkInfo(NetworkType.TYPE_MOBILE).isConnectedOrConnecting(); 
}