【Tech-Android-Other】Android中的網絡類型獲取與處理

**Android中的網絡類型獲取與處理**
開發移動軟件處理網絡連接對於程序員是一個頭疼的問題，至少我這個菜鳥這麼認爲，翻了幾個軟件發現有幾個軟件在logo頁面就是檢測網絡是否可用，在其他頁面有一個broadcast去處理，寫了一下子，貼點代碼做個筆記

@Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  if (checknetwork()) {
       //跳轉到其他頁面的代碼
      .......................
     }else {
   openNet("網絡信息", "無法連接上服務器，請檢查網絡");
  }

 }



 private void openNet(String title, String message) {
  // 讓用戶檢查網絡
  AlertDialog.Builder adb = new AlertDialog.Builder(
    LogoActivity.this);
  final AlertDialog ad = adb.create();
  // String current = "當前無法獲取定位信息";
  ad.setTitle(title);
  ad.setMessage(message);
  ad.setButton("確定", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
    //由於4.0以上把原來的設置方式捨棄了所以上面的代碼捨去
    if(android.os.Build.VERSION.SDK_INT > 13 ){  
     //3.2以上打開設置界面，也可以直接用ACTION_WIRELESS_SETTINGS打開到wifi界面  
     startActivity(new Intent(android.provider.Settings.ACTION_SETTINGS));}
    else {    
     startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));
    }

    ad.dismiss();


   }
  });
  ad.setButton2("取消", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
    ad.dismiss();
    System.exit(0);
   }
  });
  ad.show();
 }



 public boolean checknetwork() {
  ConnectivityManager mConnectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
  TelephonyManager mTelephony = (TelephonyManager) LogoActivity.this
    .getSystemService(TELEPHONY_SERVICE);
  // 檢查網絡連接，如果無網絡可用，就不需要進行連網操作等
  NetworkInfo info = mConnectivity.getActiveNetworkInfo();
  if (info == null || !mConnectivity.getBackgroundDataSetting()) {
   return false;
  }
  // 判斷網絡連接類型，只有在3G或wifi裏進行一些數據更新。
  int netType = info.getType();
  int netSubtype = info.getSubtype();
  if (netType == ConnectivityManager.TYPE_WIFI) {
   return info.isConnected();
  } else if (netType == ConnectivityManager.TYPE_MOBILE
    && netSubtype == TelephonyManager.NETWORK_TYPE_UMTS
    && !mTelephony.isNetworkRoaming()) {
   return info.isConnected();
  } else {
   return false;
  }
 }

網絡連接廣播處理,用於通知。

public class ConnectionChangeReceiver extends BroadcastReceiver {  

    private static final String TAG =ConnectionChangeReceiver.class.getSimpleName();  

    @Override   
    public void onReceive(Context context, Intent intent) {   
    Log.e(TAG, "網絡狀態改變");   

    boolean success = false;   

    //獲得網絡連接服務    
    ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);   
    // State state = connManager.getActiveNetworkInfo().getState();   
    // 獲取WIFI網絡連接狀態   
    State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();   
    // 判斷是否正在使用WIFI網絡    
    if (State.CONNECTED == state) {  
    success = true;   
    }   
    // 獲取GPRS網絡連接狀態    
    state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();  
    // 判斷是否正在使用GPRS網絡    
    if (State.CONNECTED != state) {   
    success = true;   
    }   

    if (!success) {   
    Toast.makeText(context, context.getString(R.string.your_network_has_disconnected), Toast.LENGTH_LONG).show();   
    }    
    }  

public class ConnectionChangeReceiver extends BroadcastReceiver {  

    private static final String TAG =ConnectionChangeReceiver.class.getSimpleName();  

    @Override   
    public void onReceive(Context context, Intent intent) {   
    Log.e(TAG, "網絡狀態改變");   

    boolean success = false;   

    //獲得網絡連接服務    
    ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);   
    // State state = connManager.getActiveNetworkInfo().getState();   
    // 獲取WIFI網絡連接狀態   
    State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();   
    // 判斷是否正在使用WIFI網絡    
    if (State.CONNECTED == state) {  
    success = true;   
    }   
    // 獲取GPRS網絡連接狀態    
    state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();  
    // 判斷是否正在使用GPRS網絡    
    if (State.CONNECTED != state) {   
    success = true;   
    }   

    if (!success) {   
    Toast.makeText(context, context.getString(R.string.your_network_has_disconnected), Toast.LENGTH_LONG).show();   
    }    
    }  

記得在Manifest文件裏面進行權限聲明，和廣播接收器註冊。

< !-- Needed to check when the network connection changes -->   
< uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>   
< receiver android:name="you_package_name.ConnectionChangeReceiver"   android:label="NetworkConnection">   
< intent-filter>   
      < action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>   
< /intent-filter>   
< /receiver> 

使用方式一：
一、 在Activity的onCreate中:
//註冊網絡監聽
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver, filter);

二、在Activity中的onDestroy中:
//取消監聽
unregisterReceiver(mNetworkStateReceiver);

使用方式二：
一、應用啓動時，啓動Service，在Service的onCreate方法中註冊網絡監聽：
//註冊網絡監聽
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver, filter);

二、 應用退出時，Service關閉，在Service的onDestroy方法中取消監聽：
//取消監聽
unregisterReceiver(mNetworkStateReceiver);