我在屏幕上设置了两个按钮。每当我按下第一个按钮时,它将禁用相机。 (作为管理员)
我已设置清单;
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.firstapplication.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- This is where we register our receiver -->
<receiver
android:name=".DemoDeviceAdminReceiver"
android:permission="android.permission.BIND_DEVICE_ADMIN" >
<intent-filter>
<!-- This action is required -->
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
<!-- This is required this receiver to become device admin component. -->
<meta-data
android:name="android.app.device_admin"
android:resource="@xml/device_admin_sample" />
</receiver>
</application>
我已将代码编写为;
public class MainActivity extends Activity {
static final int ACTIVATION_REQUEST = 47; // identifies our request id
DevicePolicyManager devicePolicyManager;
ComponentName demoDeviceAdmin;
@Override
protected void onCreate(Bundle savedInstanceState) {
// ...
// Initialize Device Policy Manager service and our receiver class
devicePolicyManager = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
demoDeviceAdmin = new ComponentName(this, DemoDeviceAdminReceiver.class);
}
/* begin, camera management block */
static boolean click = false ;
private OnClickListener setCamera = new OnClickListener() {
public void onClick(View v) {
if ( click == false ) {
startCamera();
click = true ;
}
else {
stopCamera();
click = false ;
}
activate () ; // activate device policy manager
}
};
private void startCamera(){
if(getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
camera.unlock();
} else {
;
}
}
@SuppressLint("NewApi") private void stopCamera(){
devicePolicyManager. setCameraDisabled(demoDeviceAdmin, true);
}
/* end, camera management block */
private OnClickListener closeApplication = new OnClickListener() {
public void onClick(View v) {
finish ();
}
};
void initializeDPM ( ) {
if (!devicePolicyManager.isAdminActive(demoDeviceAdmin)) {
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
demoDeviceAdmin);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
"Additional text explaining why this needs to be added.");
startActivityForResult(intent, ACTIVATION_REQUEST);
} else {
devicePolicyManager.lockNow();
}
}
public void activate ( ) {
// Activate device administration
Intent intent = new Intent(
DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
demoDeviceAdmin);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
"told me to do this");
startActivityForResult(intent, ACTIVATION_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case ACTIVATION_REQUEST:
if (resultCode == Activity.RESULT_OK) {
// Has become the device administrator.
} else {
//Canceled or failed.
}
return;
}
super.onActivityResult(requestCode, resultCode, data);
}
}
我的管理员课程
public class DemoDeviceAdminReceiver extends DeviceAdminReceiver{
@Override
public void onEnabled(Context context, Intent intent) {
super.onEnabled(context, intent);
}
@Override
public void onDisabled(Context context, Intent intent) {
super.onDisabled(context, intent);
}
}
我的device_admin_sample是;
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<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>
</LinearLayout>
为什么我无法以管理员身份关闭相机?