android利用广播监听设备网络连接(断网)的变化情况

android利用广播监听设备网络连接(断网)的变化情况 package cc.testnetworkchange; import android.os.Bundle; import android.app.Activity; /** * Demo描述: * 利用广播监听设备网络连接的变化情况 * 亦可借此监测到设备是否已经断开网络 */ public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } package cc.testnetworkchange; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.NetworkInfo.State; public class NetWorkChangeBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { ConnectivityManager connectivityManager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivityManager!=null) { NetworkInfo [] networkInfos=connectivityManager.getAllNetworkInfo(); for (int i = 0; i < networkInfos.length; i++) { State state=networkInfos[i].getState(); if (NetworkInfo.State.CONNECTED==state) { System.out.println("------------> Network is ok"); return; } } } //没有执行return,则当前无网络连接 System.out.println("------------> Network is validate"); intent.setClass(context, NetWorkErrorActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(intent); }