How to avoid writing duplicate boilerplate code for requesting permissions?

Question

I\'m updating my app to be Android 6-compatible. The permission model is not very complex in theory, but now I\'m in the process of implementing it and I find myself writing the

Answer 1

This is what I used for managing permissions in my app.

Parent Class for Permission

    public class PermissionManager extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback {
    private static final int REQUEST_CODE = 200;
    private Activity context;

    private String[] permissions;
    private ArrayList grantedPermissions = new ArrayList<>();
    private RequestedPermissionResultCallBack callBack;

    @Override
    public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
    }

    @Override
    protected void onStart() {
        super.onStart();
        setContentView(R.layout.actvity_permission);
        checkForRequiredPermission(getIntent().getStringArrayExtra(getString(R.string.permission)));
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        switch (requestCode) {

            case REQUEST_CODE:

                checkForGrantedPermissions(permissions, grantResults);
                break;
        }

    }


    @TargetApi(Build.VERSION_CODES.M)
    private void checkForRequiredPermission(String[] permissions) {
        ArrayList requiredPermissionList = new ArrayList<>();
        for (String permission : permissions) {
            if (ActivityCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
                requiredPermissionList.add(permission);
            } else {
                grantedPermissions.add(permission);
            }
        }

        if (requiredPermissionList.size() > 0) {
            (this).requestPermissions(requiredPermissionList.toArray(new String[requiredPermissionList.size()]), REQUEST_CODE);
        } else {

            setResult(grantedPermissions);
        }

    }


    public void checkForGrantedPermissions(String[] permissions, int[] grantResults) {

        for (int i = 0; i < permissions.length; i++) {
            if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                grantedPermissions.add(permissions[i]);
            }

        }
        setResult(grantedPermissions);

    }

    private void setResult(ArrayList grantedPermissions) {
        Intent intent = new Intent();
        intent.putStringArrayListExtra(getString(R.string.granted_permission), grantedPermissions);
        setResult(Activity.RESULT_OK, intent);
        this.finish();
    }
}

When you want to check for permission call this class like this

private void checkForPermissions() {
        Intent intent = new Intent(this, PermissionManager.class);
        intent.putExtra(getString(R.string.permission), permission);
        startActivityForResult(intent, AppConstants.PERMSION_REQUEST_CODE);
    }

Here permission is an array of permission you want to ask for something like this

    private String permission[] = new String[]{Manifest.permission.READ_PHONE_STATE, Manifest.permission.RECEIVE_SMS, Manifest.permission.READ_SMS};

and this is the code for onActivityResult

case AppConstants.PERMSION_REQUEST_CODE:
                    ArrayList grantedPermissionList = data.getStringArrayListExtra(getString(R.string.granted_permission));

                    if (grantedPermissionList != null && grantedPermissionList.size() > 0 && grantedPermissionList.contains(permission[0])) {
                        createRequest();

                    } else {
                        showSettingsDialog(getString(R.string.permission_required));
                    }

                    break;