Android开发之获取系统管理权限，即DevicePolicyManager和DeviceAdminReceiver的使用

参考：http://www.cnblogs.com/androidez/archive/2013/02/17/2915020.html

1.创建AdminReceiver，继承DeviceAdminReceiver

 import android.app.admin.DeviceAdminReceiver;
 /*
  * 设备管理器，可以设置锁屏和清除数据。请查看API指南中的Administration
  */
 public class AdminReceiver extends DeviceAdminReceiver {
 }

2.清单文件中配置：

         <receiver
             android:name=".receiver.AdminReceiver"
             android:description="@string/device_admin_description"
             android:label="@string/device_admin"
             android:permission="android.permission.BIND_DEVICE_ADMIN">
             <meta-data
                 android:name="android.app.device_admin"
                 android:resource="@xml/device_admin"/>
             <intent-filter>
                 <action android:name="android.app.action.DEVICE_ADMIN_ENABLED"/>
             </intent-filter>
         </receiver>

3.在res/xml文件夹下创建device_admin.xml文件

 <device-admin xmlns:android="http://schemas.android.com/apk/res/android">
   <uses-policies>
     <limit-password />    //设置密码规则
     <watch-login />       //监控屏幕解锁尝试次数
     <reset-password />    //更改屏幕解锁密码
     <force-lock />        //设备自动解锁
     <wipe-data />         //清除数据
     <expire-password />   //激活密码
     <encrypted-storage />   //数据加密
     <disable-camera />    //禁用摄像头
   </uses-policies>
 </device-admin>

4.在Activity中让用户激活

 public class Setup4Activity extends BaseSetupActivity {
     public static final int DPM_REQUEST_CODE = 201603;
     private CheckBox cbProtect;
     private ComponentName componentName;
     private DevicePolicyManager mDpm;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_setup4);
         componentName = new ComponentName(Setup4Activity.this,
                 AdminReceiver.class);
         mDpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
         cbProtect = (CheckBox) findViewById(R.id.cb_protect);
         boolean protect = mPref.getBoolean("protect", false);
         if (protect) {
             cbProtect.setText("防盗保护已经开启");
             cbProtect.setChecked(true);
         } else {
             cbProtect.setText("防盗保护没有开启");
             cbProtect.setChecked(false);
         }
         cbProtect.setOnCheckedChangeListener(new OnCheckedChangeListener() {

             @Override
             public void onCheckedChanged(CompoundButton buttonView,
                     boolean isChecked) {

                 if (isChecked) {
                     if (mDpm.isAdminActive(componentName)) {
                         cbProtect.setText("防盗保护已经开启");
                         mPref.edit().putBoolean("protect", true).commit();
                     } else {
                         //激活设备管理器
                         Intent intent = new Intent(
                                 DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
                         intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                                 componentName);
                         intent.putExtra(
                                 DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                                 "提示文字");
                         startActivityForResult(intent, DPM_REQUEST_CODE);

                     }

                 } else {
                     mDpm.removeActiveAdmin(componentName);
                     cbProtect.setText("防盗保护没有开启");
                     mPref.edit().putBoolean("protect", false).commit();
                 }
             }
         });
     }

     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
         if ( requestCode == DPM_REQUEST_CODE ) {
             if (resultCode == RESULT_OK) {
                 cbProtect.setText("防盗保护已经开启");
                 mPref.edit().putBoolean("protect", true).commit();
             } else {
                 cbProtect.setText("防盗保护没有开启");
                 cbProtect.setChecked(false);
                 mPref.edit().putBoolean("protect", false).commit();
             }
         }
     }
 }

5.通过监听短信，执行重置数据，修改密码等功能

 public class SmsMangerReceiver extends BroadcastReceiver {
     private DevicePolicyManager mDPM;
     private SharedPreferences mPref;

     @Override
     public void onReceive(Context context, Intent intent) {
         mDPM = (DevicePolicyManager) context
                 .getSystemService(Context.DEVICE_POLICY_SERVICE);
         mPref = context.getSharedPreferences("config",
                 Context.MODE_PRIVATE);
         boolean protect = mPref.getBoolean("protect", false);
         //开启了保护以后，才会激活短信命令。
         if ( protect ) {
             Object[] object = (Object[]) intent.getExtras().get("pdus");
             for ( Object ob : object ) {
                 SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) ob,
                         "3gpp");
                 String originatingAddress = smsMessage.getOriginatingAddress();
                 String messageBody = smsMessage.getMessageBody();
                 if ( messageBody.equals("#*alarm*#") ) {
                     // 使用MediaPlayer播放音乐
                     MediaPlayer player = MediaPlayer
                             .create(context, R.raw.ylzs);
                     player.setVolume(1.0f, 1.0f);
                     player.setLooping(true);
                     player.start();
                     abortBroadcast();
                 } else if ( messageBody.equals("#*location*#") ) {
                     // 通过service获取到经纬度
                     context.startService(new Intent(context,
                             LocationService.class));
                     abortBroadcast();
                 } else if ( messageBody.equals("#*wipedata*#") ) {
                     //清除数据
                     mDPM.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE);
                     abortBroadcast();

                 } else if ( messageBody.equals("#*lockscreen*#") ) {
                     //锁屏并设置密码
                     mDPM.lockNow();
                     mDPM.resetPassword("123456", 0);
                     abortBroadcast();
                 }
             }
         }
     }
 }