[英]Android: How to check if device is connected to another device via WiFi - Direct?
[英]How to check that wifi is NOT connected on android
我已经在应用程序中编写了一些代码来检查手机是否具有wifi连接,我可以做到这一点并且可以正常工作,但我真正想要检查的是手机未连接至wifi却似乎没有连接时工作。 我认为我在某处一定有语法错误。 请参见下面的代码:
ConnectivityManager connManager = (ConnectivityManager)
getSystemService(CONNECTIVITY_SERVICE);
myWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (!myWifi.isConnected()){
//do something
}
尝试这个
/ *网络检查* /
public static boolean haveNetworkConnection(Context context) {
boolean haveConnectedWifi = false;
boolean haveConnectedMobile = false;
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] netInfo = cm.getAllNetworkInfo();
for (NetworkInfo ni : netInfo) {
if (ni.getTypeName().equalsIgnoreCase("WIFI"))
if (ni.isConnected())
haveConnectedWifi = true;
if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
if (ni.isConnected())
haveConnectedMobile = true;
}
return haveConnectedWifi || haveConnectedMobile;
}
if (haveNetworkConnection(youractivityname.this)) {
//do your work here ..
}
您应该使用BroadcastReciever来获取活动中wifi连接的更新。 下面是示例代码
public class MainActivity extends Activity {
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
ConnectivityManager connectionManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo wifi = connectionManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
Toast.makeText(MainActivity.this, "Is Wifi connected : "+wifi.isConnected(), Toast.LENGTH_SHORT).show();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// initViews();
MainActivity.this.registerReceiver(receiver, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
}
}
还要在AndroidManifest.xml文件中写入<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
权限
在清单中具有ACCESS_NETWORK_STATE
权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
使用getActiveNetworkInfo()
方法,请使用以下方法:
private boolean notConnectedToWifi(){
final ConnectivityManager conMgr = (ConnectivityManager).getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected() && activeNetwork.getType() != ConnectivityManager.TYPE_WIFI)
return true;
else
return false;
}
接下来要做的就是在您的条件下调用该方法。 例
if(notConnectedToWifi){
// Oops! You're not connected to wifi!
}
请注意,我会检查activeNetwork
是否通过activeNetwork.isConnected()
连接,因此如果设备已连接到移动网络,则方法notConnectedToWifi()
将返回false。 如果未连接到任何网络,它将也返回false。
借助ConnectivityManager ,您将基于跟踪获取是否连接WIFI的网络信息。
检查以下代码(通过Activity上下文):
public boolean IsInternetConnected(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo nInfo = connectivity.getActiveNetworkInfo();
if (nInfo != null) {
//do your thing
if (nInfo.getType() == ConnectivityManager.TYPE_WIFI) {
// connected to wifi
return true;
}
}
return false;
}
return false;
}
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