Android app user permissions for views and actions

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Hi ,

Im wondering is it possible, to restrict a certain users actions like not be able to press certain buttons and views of what they can and cannot see in the app. The user would initial log in using their fingerprint . And based on their security level they could only view/run certain things in the app?

What I have tried:

I have been looking at demo protects for fingerprint scanners that unlock a phone,but is it possible give or restrict access to certain activities/fragments/buttons/charts/graphs within an app?

Posted 11-Sep-16 23:41pm

BEBE2011

Updated 15-Sep-16 22:26pm

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Richard MacCutchan 12-Sep-16 5:49am

Yes it is possible within an application, but why would you need this?

BEBE2011 12-Sep-16 5:54am

Could you point me in the right direction? One device will be used by many different people with different security levels in one area.

Richard MacCutchan 12-Sep-16 5:59am

Then you will need to set up a database with all the user information and security levels. you application then presents data according to the security levels of the user that logs in.

BEBE2011 12-Sep-16 6:01am

That is ok, i was thinking that it needed to be done.

BEBE2011 12-Sep-16 6:32am

Who could i prevent them doing certain actions in the app?

Richard MacCutchan 12-Sep-16 6:49am

That all depends on what the app is doing. Maybe you need to restrict access to certain database records or fields. Or only allow certain users to update the database, or edit files. Only you can decide how and what.

BEBE2011 12-Sep-16 7:29am

Can you think of any code example there might, where one user sees a button that another user cannot.

Richard MacCutchan 12-Sep-16 7:42am

Yes, but it will depend on the design of your application. The simplest way would be to make some of your menu and button elements dynamic, so they only show up after you have verified the user's credentials.

BEBE2011 12-Sep-16 11:44am

Thanks for your guidance. Can you share a link of an app/code example?

Richard MacCutchan 12-Sep-16 12:11pm

Well I could do a Google search, but I feel sure you are quite capable of doing it yourself.

BEBE2011 12-Sep-16 12:32pm

From my time searching , Android does not allow the verification of multiple different fingerprints on one device. It only currently working on a one fingerprint per device basis. Is this still true? The articles on this are from last year.

Richard MacCutchan 12-Sep-16 12:58pm

Sorry, I have not worked on fingerprint recognition so do not know. Have you checked all the Android articles here on CodeProject?

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Wessel Beulink · Answer 1 · 2016-09-15T22:26:00

Yes you can. Just launch a fingerprint helper when someone entering the restricted area. With a button click something like:

Java

public void onClick(View v) {
        if (v.getId() == R.id.cancel_button) {
            finish();
        }
        if (v.getId() == R.id.learn_more_button) {
            launchFingerprintHelp();
        }
        super.onClick(v);
    }

Launch:

C#

private void launchFingerprintHelp() {
       Intent helpIntent = HelpUtils.getHelpIntent(this,
               getString(R.string.help_url_fingerprint), getClass().getName());
       startActivity(helpIntent);
   }

Than finish it with onactivity and read if the acces was suceed:

Java

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_FINISHED) {
        finish();
    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}

Here you have a full preview of what it should like:

Java

package com.android.settings.fingerprint;
import android.app.admin.DevicePolicyManager;
import android.content.Intent;
import android.os.Bundle;
import android.os.UserHandle;
import android.view.View;
import com.android.settings.ChooseLockSettingsHelper;
import com.android.settings.HelpUtils;
import com.android.settings.R;
/**
 * Onboarding activity for fingerprint enrollment.
 */
public class FingerprintEnrollIntroduction extends FingerprintEnrollBase {
    private boolean mHasPassword;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fingerprint_enroll_introduction);
        setHeaderText(R.string.security_settings_fingerprint_enroll_introduction_title);
        findViewById(R.id.cancel_button).setOnClickListener(this);
        findViewById(R.id.learn_more_button).setOnClickListener(this);
        final int passwordQuality = new ChooseLockSettingsHelper(this).utils()
                .getActivePasswordQuality(UserHandle.myUserId());
        mHasPassword = passwordQuality != DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
    }
    @Override
    protected void onNextButtonClick() {
        Intent intent = new Intent();
        final String clazz;
        if (!mHasPassword) {
            // No fingerprints registered, launch into enrollment wizard.
            clazz = FingerprintEnrollOnboard.class.getName();
        } else {
            // Lock thingy is already set up, launch directly into find sensor step from wizard.
            clazz = FingerprintEnrollFindSensor.class.getName();
        }
        intent.setClassName("com.android.settings", clazz);
        startActivityForResult(intent, 0);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_FINISHED) {
            finish();
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.cancel_button) {
            finish();
        }
        if (v.getId() == R.id.learn_more_button) {
            launchFingerprintHelp();
        }
        super.onClick(v);
    }
    private void launchFingerprintHelp() {
        Intent helpIntent = HelpUtils.getHelpIntent(this,
                getString(R.string.help_url_fingerprint), getClass().getName());
        startActivity(helpIntent);
    }
}

Goodluck!

Android app user permissions for views and actions

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