转载 ：Android中判断网络

贴一下主要代码：

 

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/**      * 检测网络是否连接      * @return      */     private boolean checkNetworkState() {         boolean flag = false;         //得到网络连接信息         manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);         //去进行判断网络是否连接         if (manager.getActiveNetworkInfo() != null) {             flag = manager.getActiveNetworkInfo().isAvailable();         }         if (!flag) {             setNetwork();         } else {             isNetworkAvailable();         }           return flag;     }             /**      * 网络未连接时，调用设置方法      */     private void setNetwork(){         Toast.makeText(this, "wifi is closed!", Toast.LENGTH_SHORT).show();                   AlertDialog.Builder builder = new AlertDialog.Builder(this);         builder.setIcon(R.drawable.ic_launcher);         builder.setTitle("网络提示信息");         builder.setMessage("网络不可用，如果继续，请先设置网络！");         builder.setPositiveButton("设置", new OnClickListener() {             @Override             public void onClick(DialogInterface dialog, int which) {                 Intent intent = null;                 /**                  * 判断手机系统的版本！如果API大于10 就是3.0+                  * 因为3.0以上的版本的设置和3.0以下的设置不一样，调用的方法不同                  */                 if (android.os.Build.VERSION.SDK_INT > 10) {                     intent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);                 } else {                     intent = new Intent();                     ComponentName component = new ComponentName(                             "com.android.settings",                             "com.android.settings.WirelessSettings");                     intent.setComponent(component);                     intent.setAction("android.intent.action.VIEW");                 }                 startActivity(intent);             }         });           builder.setNegativeButton("取消", new OnClickListener() {             @Override             public void onClick(DialogInterface dialog, int which) {               }         });         builder.create();         builder.show();     }           /**      * 网络已经连接，然后去判断是wifi连接还是GPRS连接      * 设置一些自己的逻辑调用      */     private void isNetworkAvailable(){                   State gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();         State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();        //平板不用判断GPRS         if(gprs == State.CONNECTED || gprs == State.CONNECTING){             Toast.makeText(this, "wifi is open! gprs", Toast.LENGTH_SHORT).show();         }         //判断为wifi状态下才加载广告，如果是GPRS手机网络则不加载！         if(wifi == State.CONNECTED || wifi == State.CONNECTING){             Toast.makeText(this, "wifi is open! wifi", Toast.LENGTH_SHORT).show();             loadAdmob();         }               }           /**      * 在wifi状态下 加载admob广告      */     private void loadAdmob(){         ll = (LinearLayout) findViewById(R.id.load_ads);         ll.removeAllViews();         adsView = new AdView(this, AdSize.BANNER, "a15194a1ac9505d");         ll.addView(adsView);               adsView.loadAd(new AdRequest());     }