我正在为一次性设备开发带有LockTask模式的Application SDK 28。该应用程序通过USB OTG将某些文件从设备传输到USB闪存驱动器。为了与闪存驱动器通信，应用程序请求运行时权限，但LockTask Mode会阻止对话框消息以接受用户权限。因此，应用程序无法获得许可，并且当它想要传输文件时失败。我想知道是否退出了一种在锁定任务模式下启用某些权限或启用这些对话框的方法？
请求与Flash Drive通信的权限
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public void check() {
manager = (UsbManager) getSystemService(Context.USB_SERVICE);
/*
* this block required if you need to communicate to USB devices it's
* take permission to device
* if you want than you can set this to which device you want to communicate
*/
// ------------------------------------------------------------------
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
// -------------------------------------------------------------------
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
String i = "";
while (deviceIterator.hasNext()) {
device = deviceIterator.next();
manager.requestPermission(device, mPermissionIntent);
i += "USB Detectada!!";
}
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
UsbDevice usbDevice = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (ACTION_USB_PERMISSION.equals(action)) {
// Permission requested
synchronized (this) {
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
//cueMsg.cueCorrect("Permiso otorgado");
// User has granted permission
// ... Setup your UsbDeviceConnection via mUsbManager.openDevice(usbDevice) ...
} else {
cueMsg.cueError("Permiso denegado");
// User has denied permission
}
}
}
if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
cueMsg.cueError("Usb desconectado");
// Device removed
synchronized (this) {
// ... Check to see if usbDevice is yours and cleanup ...
}
}
if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
cueMsg.cueCorrect("Usb conectado");
// Device attached
}
}
};
LockTask模式代码
@TargetApi(Build.VERSION_CODES.M)
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onStart() {
if (mDevicePolicyManager.isLockTaskPermitted(this.getPackageName())){
ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
if (am.getLockTaskModeState() == ActivityManager.LOCK_TASK_MODE_NONE){
setDefaultCosuPolicies(true);
startLockTask();
}
}
super.onStart();
}
@RequiresApi(api = Build.VERSION_CODES.M)
private void unlockApp(){
ActivityManager am = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
if (am.getLockTaskModeState() == ActivityManager.LOCK_TASK_MODE_LOCKED){
stopLockTask();
}
setDefaultCosuPolicies(false);
}
@TargetApi(Build.VERSION_CODES.M)
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void setDefaultCosuPolicies(boolean active) {
//Configuración de restricciones de usuario
setUserRestriction(UserManager.DISALLOW_SAFE_BOOT, active);
setUserRestriction(UserManager.DISALLOW_FACTORY_RESET, active);
setUserRestriction(UserManager.DISALLOW_ADD_USER, active);
//setUserRestriction(UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA, active);
setUserRestriction(UserManager.DISALLOW_USB_FILE_TRANSFER, false);
setUserRestriction(UsbManager.EXTRA_PERMISSION_GRANTED, true);
setUserRestriction(UserManager.DISALLOW_ADJUST_VOLUME, active);
//Desabilitar lockscreen y barra de estado
mDevicePolicyManager.setKeyguardDisabled(mAdminComponentName, active);
mDevicePolicyManager.setStatusBarDisabled(mAdminComponentName, active);
//Permisos para USB
mDevicePolicyManager.setPermissionGrantState(mAdminComponentName,
"com.example.devicepolicymanager2",
UsbManager.EXTRA_PERMISSION_GRANTED,
DevicePolicyManager.PERMISSION_GRANT_STATE_DEFAULT);
//Habilitar Plugged in
enableStayOnWhilePluggedIn(active);
//Configurar politicas de actualización de sistema
if (active){
mDevicePolicyManager.setSystemUpdatePolicy(mAdminComponentName, SystemUpdatePolicy.createWindowedInstallPolicy(60, 120));
} else {
mDevicePolicyManager.setSystemUpdatePolicy(mAdminComponentName, null);
}
//Configurar la actividad como un paquete lock task
//mDevicePolicyManager.setLockTaskPackages(mAdminComponentName,
// active ? new String[]{getPackageName()} : new String[]{});
mDevicePolicyManager.setLockTaskPackages(mAdminComponentName, APP_PACKAGES);
IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MAIN);
intentFilter.addCategory(Intent.CATEGORY_HOME);
intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
if (active){
//configura actividad cosu como home para que comience al reiniciarse
mDevicePolicyManager.addPersistentPreferredActivity(mAdminComponentName,
intentFilter,
new ComponentName(getPackageName(),
LoginActivity.class.getName()));
} else {
mDevicePolicyManager.clearPackagePersistentPreferredActivities(mAdminComponentName, getPackageName());
}
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void setUserRestriction(String restriction, boolean disallow){
if (disallow){
mDevicePolicyManager.addUserRestriction(mAdminComponentName, restriction);
}else {
mDevicePolicyManager.clearUserRestriction(mAdminComponentName, restriction);
}
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void enableStayOnWhilePluggedIn(boolean enabled){
if (enabled){
mDevicePolicyManager.setGlobalSetting(mAdminComponentName,
Settings.Global.STAY_ON_WHILE_PLUGGED_IN,
Integer.toString(BatteryManager.BATTERY_PLUGGED_AC |
BatteryManager.BATTERY_PLUGGED_USB |
BatteryManager.BATTERY_PLUGGED_WIRELESS));
}else {
mDevicePolicyManager.setGlobalSetting(mAdminComponentName,
Settings.Global.STAY_ON_WHILE_PLUGGED_IN,
"0");
}
}
答案 0 :(得分：1)
在“锁定”任务模式期间，不允许打开所有未列入白名单的应用程序。您必须将USB对话框应用程序列入白名单。
private static String USB_DIALOG_PACKAGE = "com.android.systemui";
private static String[] APP_PACKAGES = {[YOUR OTHER WHITE LISTED PACKAGES HERE],USB_DIALOG_PACKAGE };