【Tech-Android-Other】Android中的网络类型获取与处理

**Android中的网络类型获取与处理**
开发移动软件处理网络连接对于程序员是一个头疼的问题，至少我这个菜鸟这么认为，翻了几个软件发现有几个软件在logo页面就是检测网络是否可用，在其他页面有一个broadcast去处理，写了一下子，贴点代码做个笔记

@Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  if (checknetwork()) {
       //跳转到其他页面的代码
      .......................
     }else {
   openNet("网络信息", "无法连接上服务器，请检查网络");
  }

 }



 private void openNet(String title, String message) {
  // 让用户检查网络
  AlertDialog.Builder adb = new AlertDialog.Builder(
    LogoActivity.this);
  final AlertDialog ad = adb.create();
  // String current = "当前无法获取定位信息";
  ad.setTitle(title);
  ad.setMessage(message);
  ad.setButton("确定", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
    //由于4.0以上把原来的设置方式舍弃了所以上面的代码舍去
    if(android.os.Build.VERSION.SDK_INT > 13 ){  
     //3.2以上打开设置界面，也可以直接用ACTION_WIRELESS_SETTINGS打开到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);
  // 检查网络连接，如果无网络可用，就不需要进行连网操作等
  NetworkInfo info = mConnectivity.getActiveNetworkInfo();
  if (info == null || !mConnectivity.getBackgroundDataSetting()) {
   return false;
  }
  // 判断网络连接类型，只有在3G或wifi里进行一些数据更新。
  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;
  }
 }

网络连接广播处理,用于通知。

public class ConnectionChangeReceiver extends BroadcastReceiver {  

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

    @Override   
    public void onReceive(Context context, Intent intent) {   
    Log.e(TAG, "网络状态改变");   

    boolean success = false;   

    //获得网络连接服务    
    ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);   
    // State state = connManager.getActiveNetworkInfo().getState();   
    // 获取WIFI网络连接状态   
    State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();   
    // 判断是否正在使用WIFI网络    
    if (State.CONNECTED == state) {  
    success = true;   
    }   
    // 获取GPRS网络连接状态    
    state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();  
    // 判断是否正在使用GPRS网络    
    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, "网络状态改变");   

    boolean success = false;   

    //获得网络连接服务    
    ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);   
    // State state = connManager.getActiveNetworkInfo().getState();   
    // 获取WIFI网络连接状态   
    State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();   
    // 判断是否正在使用WIFI网络    
    if (State.CONNECTED == state) {  
    success = true;   
    }   
    // 获取GPRS网络连接状态    
    state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();  
    // 判断是否正在使用GPRS网络    
    if (State.CONNECTED != state) {   
    success = true;   
    }   

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

记得在Manifest文件里面进行权限声明，和广播接收器注册。

< !-- 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:
//注册网络监听
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver, filter);

二、在Activity中的onDestroy中:
//取消监听
unregisterReceiver(mNetworkStateReceiver);

使用方式二：
一、应用启动时，启动Service，在Service的onCreate方法中注册网络监听：
//注册网络监听
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver, filter);

二、 应用退出时，Service关闭，在Service的onDestroy方法中取消监听：
//取消监听
unregisterReceiver(mNetworkStateReceiver);