device admin - Prevent app from Uninstall in Android

Question

What I Want

I want to have a simple checkbox in my settings menu, which if checked will ENABLE Device Administration for my app and will prevent my app from getting uninstalled.

The checkbox when unchecked will DISABLE Device Administration.

My app is about security and needs to be protected from getting uninstalled. Can I get a simple solution for this?

PS - I have read the documentation about this, but can't seem to get it working.

Answer 1

This is not possible. You cannot decide on your own to make your app be a device administrator. You are welcome to lead the user over to the appropriate spot in the Settings app to have the user elect to make your app be a device administrator, though, via ACTION_ADD_DEVICE_ADMIN.

For example, this activity will see if it is already a device admin (via isActiveAdmin()), then will launch an ACTION_ADD_DEVICE_ADMIN activity if needed:

/***
  Copyright (c) 2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
 */

package com.commonsware.android.lockme;

import android.app.Activity;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class LockMeNowActivity extends Activity {
  private DevicePolicyManager mgr=null;
  private ComponentName cn=null;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);
    cn=new ComponentName(this, AdminReceiver.class);
    mgr=(DevicePolicyManager)getSystemService(DEVICE_POLICY_SERVICE);
  }

  public void lockMeNow(View v) {
    if (mgr.isAdminActive(cn)) {
      mgr.lockNow();
    }
    else {
      Intent intent=
          new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
      intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, cn);
      intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                      getString(R.string.device_admin_explanation));
      startActivity(intent);
    }
  }
}

(from this sample project)

The two extras (EXTRA_DEVICE_ADMIN and EXTRA_ADD_EXPLANATION) are optional, though they are a good idea. The first one should be a ComponentName identifying your DeviceAdminReceiver subclass; the second one should be a string (from a string resource) that explains why the user should make your app be a device admin.

My app is about security and needs to be protected from getting uninstalled.

Since anybody can go in and decide to not make your app be a device administrator (again, through Settings), then uninstall it, this is not much of a defense.