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我試圖從外部驅動器(USB)導入數據庫文件,以恢復備份數據。該文件存在和路徑是正確的,但數據庫沒有進口的,這是我的代碼:Android從外部存儲器導入數據庫
File usb = new File("/storage/UsbDriveA/BackupHM/database.db");
File currentDB = getDatabasePath("database.db");
FileChannel source = null;
FileChannel destination = null;
String backupDBPath = "/storage/UsbDriveA/BackupHM/database.db";
File backupDB = new File(usb, backupDBPath);
try {
source = new FileInputStream(backupDB).getChannel();
destination = new FileOutputStream(currentDB).getChannel();
destination.transferFrom(source, 0, source.size());
source.close();
destination.close();
Toast toast1 = Toast.makeText(getApplicationContext(), ("Restore ok"), Toast.LENGTH_SHORT);
toast1.show();
finish();
} catch (IOException e) {
e.printStackTrace();
Toast toast = Toast.makeText(getApplicationContext(), ("Error!"), Toast.LENGTH_LONG);
toast.show();
}
}
你看到發生了什麼故障?發佈的代碼是否拋出IOException?我複製了您的代碼併成功傳輸了一個文件。 –