android 一键锁屏（二）

1、主程序代码：

Java代码

private DevicePolicyManager policyManager;

private ComponentName componentName;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.locklayout);

//获取设备管理服务

policyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);

//AdminReceiver 继承自 DeviceAdminReceiver

componentName = new ComponentName(this, AdminReceiver.class);

mylock();

// killMyself ，锁屏之后就立即kill掉我们的Activity，避免资源的浪费;

android.os.Process.killProcess(android.os.Process.myPid());

}

2、其中，mylock()为：

Java代码



private void mylock(){

boolean active = policyManager.isAdminActive(componentName);

if(!active){//若无权限

activeManage();//去获得权限

policyManager.lockNow();//并锁屏

}

if (active) {

policyManager.lockNow();//直接锁屏

}

}

3、activeManage()代码为：

Java代码

private void activeManage() {

// 启动设备管理(隐式Intent) - 在AndroidManifest.xml中设定相应过滤器

Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

//权限列表

intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);

//描述(additional explanation)

intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "------ 其他描述 ------");

startActivityForResult(intent, 0);

}

4、AndroidManifest.xml

Java代码 " quality="high" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer">

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="cn.hnu"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/app_name">

<activity android:name=".LockFirst"

android:label="@string/app_name">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<!-- 设备管理 -->

<receiver android:name=".AdminReceiver"

android:label="@string/app_name"

android:description="@string/app_name"

android:permission="android.permission.BIND_DEVICE_ADMIN">

<meta-data android:name="android.app.device_admin"

android:resource="@xml/lock_screen" />

<intent-filter>

<action

android:name="android.app.action.DEVICE_ADMIN_ENABLED" />

</intent-filter>

</receiver>

</application>

</manifest>

5、其中lock_screen.xml（lock_screen.xml文件放在res/xml文件夹下）代码为：

Java代码 " quality="high" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer">

<?xml version="1.0" encoding="UTF-8"?>

<device-admin

xmlns:android="http://schemas.android.com/apk/res/android">

<uses-policies>

<!-- 强行锁定 在里仅这个是需要的-->

<force-lock />

<!-- 清除所有数据（恢复出厂设置） -->

<wipe-data />

<!-- 重置密码 -->

<reset-password />

<!-- 限制密码选择 -->

<limit-password />

<!-- 监控登录尝试 -->

<watch-login />

</uses-policies>

</device-admin>