Android 6.0 multiple permissions

Question

I know that Android 6.0 has new permissions and I know I can call them with something like this

if (ContextCompat.checkSelfPermission(this, Manifest.permiss         


        

Answer 1

The following methodology is about

• asking permissions dynamically ;
• showing a AlertDialog if the user denies any permission
• looping until the user accepts permission(s)

Create a "static" class for permissions methods

public class PermissionsUtil {
    public static final int PERMISSION_ALL = 1;

    public static boolean doesAppNeedPermissions(){
        return android.os.Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP_MR1;
    }

    public static String[] getPermissions(Context context)
            throws PackageManager.NameNotFoundException {
        PackageInfo info = context.getPackageManager().getPackageInfo(
                context.getPackageName(), PackageManager.GET_PERMISSIONS);

        return info.requestedPermissions;
    }

    public static void askPermissions(Activity activity){
        if(doesAppNeedPermissions()) {
            try {
                String[] permissions = getPermissions(activity);

                if(!checkPermissions(activity, permissions)){
                    ActivityCompat.requestPermissions(activity, permissions,
                            PERMISSION_ALL);
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        }
    }

    public static boolean checkPermissions(Context context, String... permissions){
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null &&
                permissions != null) {
            for (String permission : permissions) {
                if (ContextCompat.checkSelfPermission(context, permission) !=
                        PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
        }
        return true;
    }
}

In MainActivity.java

    private void checkPermissions(){
        PermissionsUtil.askPermissions(this);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case PermissionsUtil.PERMISSION_ALL: {

                if (grantResults.length > 0) {

                    List indexesOfPermissionsNeededToShow = new ArrayList<>();

                    for(int i = 0; i < permissions.length; ++i) {
                        if(ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[i])) {
                            indexesOfPermissionsNeededToShow.add(i);
                        }
                    }

                    int size = indexesOfPermissionsNeededToShow.size();
                    if(size != 0) {
                        int i = 0;
                        boolean isPermissionGranted = true;

                        while(i < size && isPermissionGranted) {
                            isPermissionGranted = grantResults[indexesOfPermissionsNeededToShow.get(i)]
                                    == PackageManager.PERMISSION_GRANTED;
                            i++;
                        }

                        if(!isPermissionGranted) {

                            showDialogNotCancelable("Permissions mandatory",
                                    "All the permissions are required for this app",
                                    new DialogInterface.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialogInterface, int i) {
                                            checkPermissions();
                                        }
                                    });
                        }
                    }
                }
            }
        }
    }

    private void showDialogNotCancelable(String title, String message,
                                         DialogInterface.OnClickListener okListener) {
        new AlertDialog.Builder(this)
                .setTitle(title)
                .setMessage(message)
                .setPositiveButton("OK", okListener)
                .setCancelable(false)
                .create()
                .show();
    }