/**  *  * @author cj 判斷網(wǎng)絡(luò)工具類(lèi)  *  */ public class NetUtil {   /**    * 沒(méi)有連接網(wǎng)絡(luò)    */   private static final int NETWORK_NONE = -1;   /**    * 移動(dòng)網(wǎng)絡(luò)    */   private static final int NETWORK_MOBILE = 0;   /**    * 無(wú)線網(wǎng)絡(luò)    */   private static final int NETWORK_WIFI = 1;   public static int getNetWorkState(Context context) {     // 得到連接管理器對(duì)象     ConnectivityManager connectivityManager = (ConnectivityManager) context         .getSystemService(Context.CONNECTIVITY_SERVICE);     NetworkInfo activeNetworkInfo = connectivityManager         .getActiveNetworkInfo();     if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {       if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_WIFI)) {         return NETWORK_WIFI;       } else if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_MOBILE)) {         return NETWORK_MOBILE;       }     } else {       return NETWORK_NONE;     }     return NETWORK_NONE;   } } /**  * 自定義檢查手機(jī)網(wǎng)絡(luò)狀態(tài)是否切換的廣播接受器  *  * @author cj  *  */ public class NetBroadcastReceiver extends BroadcastReceiver {   public NetEvevt evevt = BaseActivity.evevt;   @Override   public void onReceive(Context context, Intent intent) {     // TODO Auto-generated method stub     // 如果相等的話就說(shuō)明網(wǎng)絡(luò)狀態(tài)發(fā)生了變化     if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {       int netWorkState = NetUtil.getNetWorkState(context);       // 接口回調(diào)傳過(guò)去狀態(tài)的類(lèi)型       evevt.onNetChange(netWorkState);     }   }   // 自定義接口   public interface NetEvevt {     public void onNetChange(int netMobile);   } } 

<receiver android:name="cn.broadcastreceiver.NetBroadcastReceiver" >       <intent-filter>         <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />       </intent-filter>     </receiver> abstract public class BaseActivity extends FragmentActivity implements NetEvevt {   public static NetEvevt evevt;   /**    * 網(wǎng)絡(luò)類(lèi)型    */   private int netMobile;   @Override   protected void onCreate(Bundle arg0) {     // TODO Auto-generated method stub     super.onCreate(arg0);     evevt = this;     inspectNet();   }   /**    * 初始化時(shí)判斷有沒(méi)有網(wǎng)絡(luò)    */   public boolean inspectNet() {     this.netMobile = NetUtil.getNetWorkState(BaseActivity.this);     return isNetConnect();     // if (netMobile == 1) {     // System.out.println("inspectNet：連接wifi");     // } else if (netMobile == 0) {     // System.out.println("inspectNet:連接移動(dòng)數(shù)據(jù)");     // } else if (netMobile == -1) {     // System.out.println("inspectNet:當(dāng)前沒(méi)有網(wǎng)絡(luò)");     //     // }   }   /**    * 網(wǎng)絡(luò)變化之后的類(lèi)型    */   @Override   public void onNetChange(int netMobile) {     // TODO Auto-generated method stub     this.netMobile = netMobile;     isNetConnect();   }   /**    * 判斷有無(wú)網(wǎng)絡(luò) 。    *    * @return true 有網(wǎng), false 沒(méi)有網(wǎng)絡(luò).    */   public boolean isNetConnect() {     if (netMobile == 1) {       return true;     } else if (netMobile == 0) {       return true;     } else if (netMobile == -1) {       return false;     }     return false;   } } public class MainActivity extends BaseActivity {   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     } @Override   public void onNetChange(int netMobile) {     // TODO Auto-generated method stub     //在這個(gè)判斷，根據(jù)需要做處理   } }