时间：2021-02-18 11:19:09 | 栏目：Android代码 | 点击：次
在AndroidManifest.xml中加一个权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <intent-filter> <action android:name="android.net.conn.CONNECTIVITY_CHANGE" /> </intent-filter>
主代码中实现：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
checkNetwork();
if (!checkNetwork()) {
Toast.makeText(this, "没有网络", Toast.LENGTH_LONG).show();
Intent intent = new Intent("android.settings.WIRELESS_SETTINGS");
startActivity(intent);
return;
}
}
private boolean checkNetwork() {
ConnectivityManager conn = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo net = conn.getActiveNetworkInfo();
if (net != null && net.isConnected()) {
return true;
}
return false;
}