我想要什么
我想在我的设置菜单中有一个简单的复选框，如果选中该复选框，将启用我的应用程序的设备管理，并防止我的应用被卸载。
取消选中该复选框将禁用设备管理。
我的应用程序是关于安全的，需要加以保护，以免被卸载。我能找到一个简单的解决方案吗？
PS-我已经阅读了有关这方面的文档，但似乎无法使其发挥作用。
这是不可能的。您不能自行决定让您的应用程序成为设备管理员。欢迎您将用户引导到"设置"应用程序中的适当位置，让用户通过ACTION_ADD_DEVICE_ADMIN选择让您的应用程序成为设备管理员。
例如，此活动将查看它是否已经是设备管理员（通过isActiveAdmin()），然后在需要时启动ACTION_ADD_DEVICE_ADMIN活动：
/***
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);
}
}
}
（来自此示例项目）
两个附加项（EXTRA_DEVICE_ADMIN和EXTRA_ADD_EXPLANATION）是可选的，尽管它们是个好主意。第一个应该是标识DeviceAdminReceiver子类的ComponentName；第二个应该是一个字符串（来自字符串资源），解释为什么用户应该让你的应用程序成为设备管理员。
我的应用程序是关于安全的，需要加以保护，以免被卸载。
由于任何人都可以进入并决定不让你的应用程序成为设备管理员（再次通过"设置"），然后卸载它，这并不是什么防御措施。
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");
}
}
MainActivity类似于
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);
清单是这样的：
<!-- 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>