[英]Imountservice to mount/unmount volume not working on 4.4 Android
我已經使用反射來安裝/卸載外部存儲。它在4.4 Api以下工作。 代碼在下面
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.storage.IMountService;
private static final String MOUNT_POINT = "/mnt/ext_usb" or "/mnt/sdcard/" ...
private IMountService mMountService = null;
private synchronized IMountService getMountService() {
if (mMountService == null) {
IBinder service = ServiceManager.getService("mount");
if (service != null) {
mMountService = IMountService.Stub.asInterface(service);
} else {
Log.e(TAG, "Can't get mount service");
}
}
return mMountService;
}
private void mount() {
IMountService mountService = getMountService();
try {
if (mountService != null) {
mountService.mountVolume(MOUNT_POINT);
} else {
//
}
} catch (RemoteException ex) {
// Not much can be done
}
}
private void unmount() {
StorageManager sm = (StorageManager) getSystemService(Context.STORAGE_SERVICE);
String state = sm.getVolumeState(MOUNT_POINT);
if (!Environment.MEDIA_MOUNTED.equals(state) &&
!Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
//
return;
}
IMountService mountService = getMountService();
try {
if (mountService != null) {
mountService.unmountVolume(MOUNT_POINT, true, false);
} else {
Log.e(TAG, "Mount service is null, can't unmount");
}
} catch (RemoteException ex) {
// Not much can be done
}
}
使它工作的任何解決方法。由於拋出Security Exception.android.permission.mount_unmount_filesystems所需。我已在清單中將其清除。我在google上發現了此問題,我發現該權限具有系統簽名保護級別。在此先感謝您。
為了使用帶有signature | system
東西signature | system
您的軟件包的signature | system
權限必須使用平台的簽名密鑰進行簽名。 除非您要創建自己的自定義ROM或擁有根設備,否則將無法執行此操作。
如果您的應用是常規的第三方應用(在Play商店中發布),則您應僅使用公共API,而不必依賴反射。 僅公開的Android API被認為是穩定且公開的。 其他的則被隱藏,因為它們僅旨在供系統內部使用。
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