项目：lockscreen
文件：DeviceAdminSample.java
public void get_admin(){
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,mDeviceAdminSample);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"to lock screen");
intent.putExtra("force-locked",DeviceAdminInfo.USES_POLICY_FORCE_LOCK);
startActivityForResult(intent,1);
}
private boolean areOtherAdminsSet() {
List<ComponentName> admins = dpm.getActiveAdmins();
return Iterables.tryFind(admins,new Predicate<ComponentName>() {
@Override
public boolean apply(android.content.ComponentName c) {
return !cn.equals(c) && dpm.hasGrantedPolicy(
c,DeviceAdminInfo.USES_POLICY_LIMIT_PASSWORD);
}
}).isPresent();
}
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