需要注册的权限 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
- /**
- * 设置在onStart()方法里面,可以在界面每次获得焦点的时候都进行检测
- */
- @Override
- protected void onStart() {
- ConnectivityManager manager = (ConnectivityManager) this
- .getSystemService(Context.CONNECTIVITY_SERVICE);
- NetworkInfo info = manager.getActiveNetworkInfo();
- if (info != null && info.isConnected()) {
- Toast.makeText(MainActivity.this, "网络连接连接", 0).show();
- } else {
- AlertDialog.Builder builder = new Builder(MainActivity.this);
- builder.setTitle("开启网络服务");
- builder.setMessage("网络没有连接,请到设置进行网络设置!");
- builder.setPositiveButton("确定",
- new DialogInterface.OnClickListener() {
- public void onClick(DialogInterface dialog, int which) {
- if (android.os.Build.VERSION.SDK_INT > 10) {
- // 3.0以上打开设置界面,也可以直接用ACTION_WIRELESS_SETTINGS打开到wifi界面
- startActivity(new Intent(
- android.provider.Settings.ACTION_SETTINGS));
- } else {
- startActivity(new Intent(
- android.provider.Settings.ACTION_WIRELESS_SETTINGS));
- }
- dialog.cancel();
- }
- });
- builder.setNegativeButton("取消",
- new DialogInterface.OnClickListener() {
- @Override
- public void onClick(DialogInterface dialog, int which) {
- dialog.cancel();
- }
- });
- builder.show();
- }
- super.onStart();
- }
来源: http://www.phpxs.com/code/1001793/