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.
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.
import android.app.admin.DeviceAdminReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
/**
* This is the component that is responsible for actual device administration.
* It becomes the receiver when a policy is applied. It is important that we
* subclass DeviceAdminReceiver class here and to implement its only required
* method onEnabled().
*/
public class DemoDeviceAdmin extends DeviceAdminReceiver {
static final String TAG = "DemoDeviceAdmin";
/** Called when this application is approved to be a device administrator. */
@Override
public void onEnabled(Context context, Intent intent) {
super.onEnabled(context, intent);
Toast.makeText(context, R.string.device_admin_enabled,
Toast.LENGTH_LONG).show();
Log.d(TAG, "onEnabled");
}
/** Called when this application is no longer the device administrator. */
@Override
public void onDisabled(Context context, Intent intent) {
super.onDisabled(context, intent);
Toast.makeText(context, R.string.device_admin_disabled,
Toast.LENGTH_LONG).show();
Log.d(TAG, "onDisabled");
}
@Override
public void onPasswordChanged(Context context, Intent intent) {
super.onPasswordChanged(context, intent);
Log.d(TAG, "onPasswordChanged");
}
@Override
public void onPasswordFailed(Context context, Intent intent) {
super.onPasswordFailed(context, intent);
Log.d(TAG, "onPasswordFailed");
}
@Override
public void onPasswordSucceeded(Context context, Intent intent) {
super.onPasswordSucceeded(context, intent);
Log.d(TAG, "onPasswordSucceeded");
}
}
And the MainActivity goes like this
devicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
demoDeviceAdmin = new ComponentName(this, DemoDeviceAdmin.class);
Log.e("DeviceAdminActive==", "" + demoDeviceAdmin);
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);// adds new device administrator
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, demoDeviceAdmin);//ComponentName of the administrator component.
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
"Disable app");//dditional explanation
startActivityForResult(intent, ACTIVATION_REQUEST);
And Manifest goes like this :
<!-- This is where we register our receiver -->
<receiver
android:name=".DemoDeviceAdmin"
android:permission="android.permission.BIND_DEVICE_ADMIN" >
<intent-filter>
<!-- This action is required -->
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
<!-- This is required this receiver to become device admin component. -->
<meta-data
android:name="android.app.device_admin"
android:resource="@xml/device_admin_sample" />
</receiver>