问题
I'm trying to get the new ConnectivityManager.bindProcessToNetwork(Network) using ConnectivityManager.requestNetwork(NetworkRequest, ConnectivityManager.NetworkCallback)
The reason is to force the app to call the future request in some specific network, which doesn't have a internet connectivity (it's a local hardware communication network). At this point, the system is sending the requests over 3G/4G network and never reach the desired Wifi network, because this network doesn't respond the connectivity check that android call.
When I call the requestNetwork method, I receive the following error:
java.lang.SecurityException: com.xyz.app was not granted either of these permissions: android.permission.CHANGE_NETWORK_STATE, android.permission.WRITE_SETTINGS.
I try to call the new method to request permission available in Android 6.0:
requestPermissions(new String[]{Manifest.permission.CHANGE_NETWORK_STATE, Manifest.permission.WRITE_SETTINGS}, PERMISSIONS_REQUEST_WIFI);
But the callback is always PackageManager.PERMISSION_DENIED.
I put both of these permissions in the AndroidManifest.xml, without success.
Notice: The Manifest.permission.WRITE_SETTINGS is not in the Permissions Groups.
回答1:
I'm not sure if this was intended by Google, but the following is the behavior I'm seeing:
CHANGE_NETWORK_STATE seems to always be denied (as noted in the comments, its a signature permission) but it also doesn't seem to matter. My ConnectivityManager network requests all seem to be gated by WRITE_SETTINGS only - so if you have WRITE_SETTINGS you don't need CHANGE_NETWORK_STATE.
As noted in comments, you do this differently than other permissions, using:
Intent goToSettings = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
goToSettings.setData(Uri.parse("package:" + Context.getPackageName()));
startActivity(goToSettings);
And after that, my ConnectivityManager network requests were peachy.
To check if the permission is already granted before calling the ACTION_MANAGE_WRITE_SETTINGS activity, this answer has the solution using
Settings.System.canWrite(Context)
Can't get WRITE_SETTINGS permission
UPDATE: as of Android 6.0.1, CHANGE_NETWORK_STATE is auto granted when requested in your manifest file. The above WRITE_SETTINGS checks are only required for 6.0
回答2:
This was an Android 6.0 bug. It's fixed in Android 6.0.1, requestNetwork() can be called if you request CHANGE_NETWORK_STATE in the manifest. No need to call requestPermissions(), it's a normal permission.
来源：https://stackoverflow.com/questions/32185628/connectivitymanager-requestnetwork-in-android-6-0