防止應用在Android中卸載

Question

我想要的是

我希望在我的設置菜單中有一個簡單的復選框，如果選中此復選框將啟用我的應用程序的設備管理，並將阻止我的應用程序被卸載。

取消選中該復選框將禁用“設備管理”。

我的應用程序是關於安全性的，需要保護其免受卸載。 我可以為此獲得一個簡單的解決方案嗎？

PS - 我已經閱讀了有關這方面的文檔，但似乎無法使其正常工作。

Answer 1

這是不可能的。 您無法自行決定是否將您的應用設備作為設備管理員。 歡迎您引導用戶訪問“設置”應用中的相應位置，讓用戶選擇通過ACTION_ADD_DEVICE_ADMIN使您的應用成為設備管理員。

例如，此活動將查看它是否已經是設備管理員（通過isActiveAdmin() ），然后將根據需要啟動ACTION_ADD_DEVICE_ADMIN活動：

/***
  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);
    }
  }
}

（來自這個示例項目 ）

這兩個額外內容（ EXTRA_DEVICE_ADMIN和EXTRA_ADD_EXPLANATION ）是可選的，但它們是個好主意。 第一個應該是標識您的DeviceAdminReceiver子類的ComponentName ; 第二個應該是一個字符串（來自字符串資源），解釋了為什么用戶應該使您的應用程序成為設備管理員。

我的應用程序是關於安全性的，需要保護其免受卸載。

由於任何人都可以進入並決定不讓您的應用成為設備管理員（再次通過設置），然后卸載它，這不是一個很好的防御。

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就是這樣的

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);

和Manifest是這樣的：

 <!-- 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>