Android设备管理API来为方便企业应用控制员工!
一个APP激活了设备管理后,APP不可卸载(必须取消激活才能卸载),
可锁屏/自动锁屏/重置锁屏密码/禁用相机/擦除SD卡数据/恢复出厂等等,权限非常高！

立即锁屏 Lock device immediately
锁屏前的不活动时间 Maximum inactivity time lock	
指定存储区域加密 Require storage encryption	
擦拭数据(恢复出厂) Wipe the device's data	
禁用相机 Disable camera

开启手机PIN或密码 Password enabled
密码最小长度 Minimum password length
密码是字母数字 Alphanumeric password required
密码必须是字母数字符号混合 Complex password required	
密码有效期 Password expiration timeout
密码失败次数 Maximum failed password attempts	

DeviceAdminReceiver	用于接收系统发送的原始意向动作
DevicePolicyManager 用于设备管理策略类
DeviceAdminInfo	 用于指定设备管理员组件的元数据

1.1创建 MyReceiver 类,必须继承DeviceAdminReceiver类
public class MyReceiver extends DeviceAdminReceiver {		
	@Override
	public void onEnabled(Context context, Intent intent) {
		//设备管理可用
	}

	@Override
	public void onDisabled(Context context, Intent intent) {
		//设备管理不可用
	}

	@Override
	public void onPasswordChanged(Context context, Intent intent) {		
	}
	...
}

1.2在AndroidManifest.xml
<receiver 
		android:name=".MyReceiver"
		android:label="用户可看的权限标题"
		android:description="用户可看的权限描述"
		android:permission="android.permission.BIND_DEVICE_ADMIN"> 
		必须拥有的权限,确保只有系统可以与DeviceAdminReceiver子类交互
	<meta-data
			android:name="android.app.device_admin"
			android:resource="@xml/device_xxx" />
			
	<intent-filter>
		<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
		当用户启用设备管理员APP时,将DeviceAdminReceiver子类设置为接收器
	</intent-filter>		
</receiver>

1.3在res/xml/device_xxx.xml
在xml中声明APP需要的设备管理策略,如密码,锁屏,擦除数据,加密等等
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
  <uses-policies>
	<limit-password />
	<watch-login />
	<reset-password />
	<force-lock />
	<wipe-data />
	<expire-password />
	<encrypted-storage />
	<disable-camera />
  </uses-policies>
</device-admin>

ComponentName myReceiverName = new ComponentName(this,MyReceiver.class);	
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);	
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, myReceiverName);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"给用户介绍文字");
startActivity(intent);

DevicePolicyManager dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
ComponentName myReceiverName = new ComponentName(this,MyReceiver.class);
// 2.锁屏/擦除数据/	
if(dpm.isAdminActive(myReceiverName)){	//是否激活APP设备管理
	// 立刻锁屏
	dpm.lockNow();			
	// 设置自动锁屏,不活动时间
	dpm.setMaximumTimeToLock(myReceiverName, timeMs);		
	// 重置锁屏密码		
	dpm.resetPassword("123456", 0);
	
	// 禁用相机
	dpm.setCameraDisabled(myReceiverName, false);
	
	// 擦除SD卡数据
	//dpm.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE);
	
	// 恢复出厂
	//dpm.wipeData(0);
}else{
	Toast.makeText(this, "还没有激活APP设备管理", 0).show();
}

DevicePolicyManager dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
ComponentName myReceiverName = new ComponentName(this,MyReceiver.class);
// 取消设备管理
dpm.removeActiveAdmin(myReceiverName);
// 卸载
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setData(Uri.parse("package:"+getPackageName()));
startActivity(intent);