Check for user permissions, on current activity.

Android Check Permissions

   /**
   * permissions request code
   */
    private final static int REQUEST_CODE_ASK_PERMISSIONS = 1;

    /**
     * Permissions that need to be explicitly requested from end user.
     */
    private static final String[] REQUIRED_SDK_PERMISSIONS = new String[]{
            Manifest.permission.CAMERA,
            Manifest.permission.INTERNET,
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.BLUETOOTH,
            Manifest.permission.BLUETOOTH_ADMIN,
            Manifest.permission.ACCESS_COARSE_LOCATION};

    /**
     * Checks the dynamically-controlled permissions and requests missing permissions from end user.
     */
    protected void checkPermissions() {

        final List<String> missingPermissions = new ArrayList<String>();
        // check all required dynamic permissions
        for (final String permission : REQUIRED_SDK_PERMISSIONS) {
            final int result = ContextCompat.checkSelfPermission(this, permission);
            if (result != PackageManager.PERMISSION_GRANTED) {
                missingPermissions.add(permission);
            }
        }
        if (!missingPermissions.isEmpty()) {
            // request all missing permissions
            final String[] permissions = missingPermissions
                    .toArray(new String[missingPermissions.size()]);
            ActivityCompat.requestPermissions(this, permissions, REQUEST_CODE_ASK_PERMISSIONS);
        } else {
            final int[] grantResults = new int[REQUIRED_SDK_PERMISSIONS.length];
            Arrays.fill(grantResults, PackageManager.PERMISSION_GRANTED);
            onRequestPermissionsResult(REQUEST_CODE_ASK_PERMISSIONS, REQUIRED_SDK_PERMISSIONS,
                    grantResults);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[],
                                           @NonNull int[] grantResults) {
        switch (requestCode) {
            case REQUEST_CODE_ASK_PERMISSIONS:
                for (int index = permissions.length - 1; index >= 0; --index) {
                    if (grantResults[index] != PackageManager.PERMISSION_GRANTED) {
                        // exit the app if one permission is not granted
                        Toast.makeText(this, "Required permission '" + permissions[index]
                                + "' not granted, exiting", Toast.LENGTH_LONG).show();
                        finish();
                        return;
                    }
                }
                // all permissions were granted
                break;
        }
    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        checkPermissions();

    }