判断手机是否连接网络的代码 private Boolean isOnline() { ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo ni = cm.getActiveNetworkInfo(); if(ni != null && ni.isConnected()){ return true;} return false; } 另外你还需要在androidManifest.xml 添加下更权限 <uses-permission android:name=”android.permission.INTERNET” /> <uses-permission android:name=”android.permission.ACCESS_NETWORK_STATE” />