App Permissions

Codelab







 

Who am I?!



Deuphil Kaufmann
@deubaka
SDK Developer @ HyperGrowth
PADC Co-organizer
Java/Android/Mobile

Prerequisite


  • Build tools at least 23.x.x
  • Support library at least 23.x.x
  • Android 6.0 Emulator/Device

    Permissions - then and now

     

    But why?


    • Permissions were out of context and vague
      • Users will tap it anyway
    • Created friction during installs/updates
    • All or nothing
    • No post installation user control

    Which in what?

    • 8 Permission Group
      • Contacts
      • Calendar
      • SMS
      • Location
      • Camera
      • Sensors
      • Microphone
    • 2 Protection Categories
      • Normal - Enabled by default on install time
        • ACCESS_NETWORK_STATE
        • INTERNET
        • BLUETOOTH
      • Dangerous - Must request on runtime

    When and how to ask?


    How to?

    • Check for permission before executing affected code
      • Use ContextCompat-subclasses to access checkSelfPermissions
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
    == PackageManager.PERMISSION_GRANTED) {
    // Do code here
    } else {
    // Request permission here
    }
    • Use ActivityCompat.requestPermissions() to request permissions
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA) {
    Snackbar.make(mAnchorLayout, "Camera permission is needed to attach pictures",
    Snackbar.LENGTH_INDEFINITE)
    .setAction(R.string.ok, new View.OnClickListener() {
    @Override
    public void onClick(View view) {
    ActivityCompat.requestPermissions(MainActivity.this,
    new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
    }
    })
    .show();
    } else {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
    REQUEST_CAMERA);
    }

    ...

    • Implement ActivityCompat.OnRequestPermissionsResultCallback
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
    @NonNull int[] grantResults) {

    if (requestCode == REQUEST_CAMERA) {
    if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { Snackbar.make(mAnchorLayout, "You can now take photos",
    Snackbar.LENGTH_SHORT).show();
    } else { Snackbar.make(mAnchorLayout, "Permission not granted",
    Snackbar.LENGTH_SHORT).show();
    }
    }
    }



    Gotchas


    • If device is API 22/Lollipop and below OR targetSdk is 22 and below, then permissions will be granted at install time
    • If device is API 23/Marshmallow and above AND targetSdk is 23 and above, then permissions can be denied and are runtime
    • If device is API 23/Marshmallow BUT targetSdk is 22 and below, then permissions can still be denied, but won't crash
    • Once "Never ask again" is ticked, ActivityCompat.shouldShowRequestPermissionRationale will always return false
    • Option to redirect to app info page only 

    Some things to keep in mind


    • You still need to define all your app's permission in your AndroidManifest.xml
    • Consider using an intent to offload the permission request, ex. launch camera app instead
    • Only ask when you need it (see quadrant)
    • Be mindful not to overwhelm user
    • Explain why you need it (see quadrant again)
    • By providing runtime permissions on your app, you create a "trust" between your product and user






    End

    References and further readings

    DevFest 2015 - Android 6.0 App Permissions

    By Deuphil Kaufmann (deu)

    DevFest 2015 - Android 6.0 App Permissions

    A presentation/codelab on Android 6.0 Marshmallow new App Permissions for GDG DevFest 2015 held at PLDT InnoLab on October 16-17, 2015.

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