本文实例讲述了Android编程判断网络是否可用及调用系统设置项的方法。分享给大家供大家参考，具体如下：
private boolean checkNetwork() { boolean flag = false; ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); if (manager.getActiveNetworkInfo() != null) flag = manager.getActiveNetworkInfo().isAvailable(); if (!flag) { Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络").setMessage( "请开启GPRS或WIFI网络连接"); b.setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { Intent mIntent = new Intent("/"); ComponentName comp = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings"); mIntent.setComponent(comp); mIntent.setAction("android.intent.action.VIEW"); startActivity(mIntent); } }).setNeutralButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.cancel(); } }).create(); b.show(); } return flag;} 权限是少不了的：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
