我正在嘗試將DB從Assets文件夾復制到設備。這段代碼在模擬器和根設備上運行正常。我只想知道它是在無根設備上創建任何問題還是可以正常工作。private void StoreDatabase() { File DbFile = new File( "data/data/packagename/DBname.sqlite"); if (DbFile.exists()) { System.out.println("file already exist ,No need to Create"); } else { try { DbFile.createNewFile(); System.out.println("File Created successfully"); InputStream is = this.getAssets().open("DBname.sqlite"); FileOutputStream fos = new FileOutputStream(DbFile); byte[] buffer = new byte[1024]; int length = 0; while ((length = is.read(buffer)) > 0) { fos.write(buffer, 0, length); } System.out.println("File succesfully placed on sdcard"); // Close the streams fos.flush(); fos.close(); is.close(); } catch (IOException e) { e.printStackTrace(); } }}
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TA貢獻1846條經驗 獲得超7個贊
我不確定，但這可以在我測試過的每臺設備上使用。我從這里的某個地方偷了這個方法，并使其在備份和還原方面通用：
public static void movedb(File srcdb, File destdb)
{
try
{
if (Environment.getExternalStorageDirectory().canWrite())
{
if (srcdb.exists())
{
FileChannel src = new FileInputStream(srcdb).getChannel();
FileChannel dst = new FileOutputStream(destdb).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
else
{
//ERROR: "Database file references are incorrect"
}
}
else
{
//ERROR: "Cannot write to file"
}
}
catch (Exception e)
{
//ERROR: e.getMessage()
}
}
然后我通過調用以下內容進行備份：
movedb(this, getDatabasePath(getDbName()), new File(Environment.getExternalStorageDirectory(), getDatabaseBackupPath()));
哪里getDatabasePath()和getDatabaseBackupPath()只是字符串值
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