2. A Selim Salman
Diversified Android Engineer
@a_selims- Started Android since 2009 in MSc.
- Lived the Diversity of technology.
- Back officially to Android 3 years ago!
3. The Story
Overview about Permissions
M BorderLine
Use the permissions effectively
“Nobody can hurt me without my permission.”
Mahatma Gandhi
4. What is a permission?
A string that has power!
Defined at: AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />
7. After M: RunTime permissions
Types of permissions:
- normal “granted”
- dangerous “request”
Permission Groups:
- e.g. CONTACT
Simple, Empowering, Go The extra mile
SDK 23+
11. Check the permission
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) !=
PackageManager.PERMISSION_GRANTED) {
if (shouldShowRequestPermissionRationale(
Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
tvAlert.setText("Hey Man, I need this permission or I ..."); //Explain decently!
}
String[] reqPerms = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
requestPermissions(reqPerms, REQ_CODE_EXT_STORAGE);
return;
}
}
12. Handle the Permission
@@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if(requestCode == REQ_CODE_EXT_STORAGE){
if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
//ToDo write to Disk
} else {
//ToDo Deal with the situation gracefully
}
}
}
13. If not granted
“When the app attempts to perform an operation that requires that permission, the
operation will not necessarily cause an exception. Instead, it might return an
empty data set, signal an error, or otherwise exhibit unexpected behavior. For
example, if you query a calendar without permission, the method returns an empty
data set.”
http://developer.android.com/preview/features/runtime-permissions.html
https://github.com/aselims/android-RuntimePermissions
14. Devices and Apps
○ Pre-M device, pre-M app “1 shot”
○ Pre-M device, M app “1 shot”
○ M device, M app “RT”
○ M device, pre-M app “1 shot but revoked”
handle M APIs:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {}
15. Effective Permissions
Remove the permissions you do not need, How?!
- Google Play Services & 3rd party Libs permissions
- Selectively compile the libs that you need. https://developers.google.
com/android/guides/setup
- Edit Libs from source.
Use Intents! “No control over UX”
