Android開發之獲取系統管理權限，即DevicePolicyManager和DeviceAdminReceiver的使用

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

1.創建AdminReceiver，繼承DeviceAdminReceiver

import android.app.admin.DeviceAdminReceiver;
/*
 * 設備管理器，可以設置鎖屏和清除數據。請查看API指南中的Administration
 */
public class AdminReceiver extends DeviceAdminReceiver {
}

2.清單文件中配置：

        <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文件夾下創建device_admin.xml文件

<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
  <uses-policies>
    <limit-password />    //設置密碼規則
    <watch-login />       //監控屏幕解鎖嘗試次數  
    <reset-password />    //更改屏幕解鎖密碼
    <force-lock />        //設備自動解鎖
    <wipe-data />         //清除數據
    <expire-password />   //激活密碼
    <encrypted-storage />   //數據加密
    <disable-camera />    //禁用攝像頭
  </uses-policies>
</device-admin>

4.在Activity中讓用戶激活

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("防盜保護已經開啟");
            cbProtect.setChecked(true);
        } else {
            cbProtect.setText("防盜保護沒有開啟");
            cbProtect.setChecked(false);
        }
        cbProtect.setOnCheckedChangeListener(new OnCheckedChangeListener() {


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

                if (isChecked) {
                    if (mDpm.isAdminActive(componentName)) {
                        cbProtect.setText("防盜保護已經開啟");
                        mPref.edit().putBoolean("protect", true).commit();
                    } else {
                        //激活設備管理器
                        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("防盜保護沒有開啟");
                    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("防盜保護已經開啟");
                mPref.edit().putBoolean("protect", true).commit();
            } else {
                cbProtect.setText("防盜保護沒有開啟");
                cbProtect.setChecked(false);
                mPref.edit().putBoolean("protect", false).commit();
            }
        }
    }
}

5.通過監聽短信，執行重置數據，修改密碼等功能

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);
        //開啟了保護以后，才會激活短信命令。
        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播放音樂
                    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*#") ) {
                    // 通過service獲取到經緯度
                    context.startService(new Intent(context,
                            LocationService.class));
                    abortBroadcast();
                } else if ( messageBody.equals("#*wipedata*#") ) {
                    //清除數據
                    mDPM.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE);
                    abortBroadcast();

                } else if ( messageBody.equals("#*lockscreen*#") ) {
                    //鎖屏並設置密碼
                    mDPM.lockNow();
                    mDPM.resetPassword("123456", 0);
                    abortBroadcast();
                }
            }
        }
    }
}