After further research, i found that requestPermission only works on Android M. If i just include the permissions i needed in android manifest file, how does android ask user for the permission granted? For example, access fine location permission. I try including the requestPermission but never see the dialog.
Before Marshmallow, all the permissions are granted at installation time. That's why you don't see a dialog requesting permission on Lollipop and previous versions on runtime.
Check this out: Runtime Permissions. It only applies to Marshmallow and above.
Related
I am developing a COSU/KIOSK application and I need to manually update the time on the device.
I am using AlertManager.setTime(Calendar) to do so, but I can't grant my application the SET_TIME permission that it is required.
The application is the device owner, and this allowed me to use many other system permissions, for example
android:name="android.permission.REBOOT"
android:name="android.permission.SHUTDOWN"
android:name="android.permission.WRITE_SETTINGS"
android:name="android.permission.INSTALL_PACKAGES"
android:name="android.permission.DELETE_PACKAGES"
All of these permissions were granted to my application, just by listing them in the manifest.xml
But SET_TIME does not work.
I also tried using the device policy manager
mDevicePolicyManager.setPermissionGrantState(mAdminComponentName, getPreferredPackageName(),
Manifest.permission.SET_TIME, DevicePolicyManager.PERMISSION_GRANT_STATE_GRANTED);
This function returned false meaning it couldn't grant permission.
How can I solve this problem without prompting the user to grant this permission to my application.
If you are targeting devices api 28+ (android 9 and higher) you can set it with setTime(ComponentName admin, long millis) function.
For lower android versions I had to rely on a device manufacturer api to set device time.
Manifest.permission.SET_TIME is proteced/system permission, sadly deviceOwner cannot grant any protected permissions with setPermissionGrantState() function.
There is very important word in its documentation:
Sets the grant state of a !runtime! permission for a specific application.
As we know in Marshmallow we need to ask permission from users.
Recently I have installed BookMyShow and found there is no dialog pop up for permission.
When I checked from setting->app, All required permissions were there.
how do they do it? ..
Their targetSdkVersion is lower than 23, presumably.
So I have camera permission in manifest , Still when app goes to start camera it crashes .this happens beacuse user had denied the permission in permission manager for camera that comes with xiaomi devices
So the app Crashes , can someone help about how to handle this.
with the normal way of getting permisions , it does not give correct result
String permission = "android.permission.CAMERA";
int res = getContext().checkCallingOrSelfPermission(permission);
res is always 0(has Permission) for below 23 devices , if user has manually denied permission by going to permission manager then also
Revoking permissions on android devices below 23 is non-standard behavior and is afaik only possible through customized OS versions (like Cyanogen mod or in your case, the Xiaomi modified version). Users should be aware, that revoking permissions that way may cause error ins apps.
Prior to Android 6.0, you could reasonably assume that if your app is running at all, it has all the permissions it declares in the app manifest.
https://developer.android.com/training/permissions/best-practices.html#testing
Therefore I suggest you run your methods that require a certain permission with a try/catch. If the api lvl is below 23 and your method call fails, you know for sure if you have the permission or not.
I have faced problems while getting Location data in OEM's Custom OS (Pre-Marshmallow i.e. Android Version < 6.0) with Permission Managers where the user can deny Location permission to the app.
Is there a way to detect that the permissions have been denied and also a way to ask for those permissions?
Short and simple question:
rooted devices can grant apps with extra permissions during runtime (using "grant permission" command using the adb , as I recall). An example for this is the ability to read system logs , which became a non-user permission starting with API16 (link here) .
Is there a list of such permissions?
The command you may be thinking of is pm grant PACKAGE PERMISSION, which can be sent to an adb-connected device using adb shell pm grant PACKAGE PERMISSION.
However, only optional permissions can be granted or revoked this way. If you try to grant a permission not requested in the app's manifest, you'll get Operation not allowed: java.lang.SecurityException: Package PACKAGE has not requested permission PERMISSION. Likewise, if you try to revoke a permission not deemed optional, you'll get Operation not allowed: java.lang.SecurityException: Can't change PERMISSION. It is required by the application. Even for a rooted device or emulator.
Now, as far as what is deemed 'optional', as well as getting a list of such permissions, that's a little unclear. However, based on some experimentation, I believe these include at least the set of permissions assigned to permission group android.permission-group.DEVELOPMENT_TOOLS. You can see which these are on a running device using pm list permissions -g. On my API 19 emulator, as well as a Nexus 7 running AOSP 4.4.4, these are:
group:android.permission-group.DEVELOPMENT_TOOLS
permission:android.permission.ACCESS_ALL_EXTERNAL_STORAGE
permission:android.permission.SIGNAL_PERSISTENT_PROCESSES
permission:android.permission.READ_LOGS
permission:android.permission.SET_ALWAYS_FINISH
permission:android.permission.WRITE_SECURE_SETTINGS
permission:android.permission.SET_PROCESS_LIMIT
permission:android.permission.CHANGE_CONFIGURATION
permission:android.permission.DUMP
permission:android.permission.SET_DEBUG_AP
If (and only if) these are declared in the manifest, then you can grant/revoke them using the above command. Note that they are not granted automatically on installation; you must issue the pm grant command. I was able to observe and confirm this by using the Settings app and seeing the reported permissions change as I granted and revoked them.
There may be other permissions that behave like this, but I haven't found them. Normal permissions like android.permission.INTERNET cannot be granted or revoked in this manner.
Addendum: Per additional question in comment section regarding pm set-permission-enforced PERMISSION: As far as I know, the only permission which currently supports this is android.permission.READ_EXTERNAL_STORAGE. I'm basing this statement on my reading of the source code, which is also consistent with my experiences using the command. The purpose of the selective enforcement setting on this permission is to allow testing of apps under pre- and post-API 19 conditions as described here.