android - 防止应用程序在 Android 中卸载

Question

我想要的是

我想在我的设置菜单中有一个简单的复选框，如果选中它将为我的应用程序启用设备管理，并防止我的应用程序被卸载。

未选中的复选框将禁用设备管理。

我的应用程序是关于安全性的，需要防止被卸载。我能得到一个简单的解决方案吗？

PS - 我已阅读有关此的文档，但似乎无法使其正常工作。

Answer 1

这是不可能的。您无法自行决定让您的应用成为设备管理员。欢迎您将用户引导到设置应用程序中的适当位置，让用户选择让您的应用程序成为设备管理员，不过，通过ACTION_ADD_DEVICE_ADMIN.

例如，此活动将查看它是否已经是设备管理员（通过isActiveAdmin()），然后ACTION_ADD_DEVICE_ADMIN在需要时启动活动：

/***
  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);
    }
  }
}

（来自这个示例项目）

这两个额外的 (EXTRA_DEVICE_ADMIN和EXTRA_ADD_EXPLANATION) 是可选的，尽管它们是一个好主意。第一个应该是ComponentName识别您的DeviceAdminReceiver子类；第二个应该是一个字符串（来自字符串资源），它解释了为什么用户应该让您的应用成为设备管理员。

我的应用程序是关于安全性的，需要防止被卸载。

由于任何人都可以进入并决定不让您的应用程序成为设备管理员（再次通过设置），然后将其卸载，这并不是什么防御措施。

Answer 2

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 是这样的

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>