我看過幾篇關于如何在android中導入和導出數據庫的帖子,我找到了這些代碼,但我似乎無法使它工作.我收到錯誤java.io.filenotfoundexception / storage / sdcard0 / BackupFolder / DatabaseName：打開失敗的ENOENT(沒有這樣的文件或目錄).我改變了一些東西,但我仍然沒有找到文件異常

這是我的出口：

private void exportDB() {

try {

db.open();

File newFile = new File("/sdcard/myexport");

InputStream input = new FileInputStream(

"/data/data/com.example.mycarfuel/data

bases/MyDatabase");

OutputStream output = new FileOutputStream(newFile);

byte[] buffer = new byte[1024];

int length;

while ((length = input.read(buffer)) > 0) {

output.write(buffer, 0, length);

}

output.flush();

output.close();

input.close();

db.close();

} catch (FileNotFoundException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

和我的導入：

private void importDB() {

try {

File sd = Environment.getExternalStorageDirectory();

File data = Environment.getDataDirectory();

if (sd.canWrite()) {

String currentDBPath = "//data//" + "PackageName"

+ "//databases//" + "DatabaseName";

String backupDBPath = "/BackupFolder/DatabaseName

";

File backupDB = new File(data, currentDBPath);

File currentDB = new File(sd, backupDBPath);

FileChannel src = new FileInputStream(currentDB).getChannel();

FileChannel dst = new FileOutputStream(backupDB).getChannel();

dst.transferFrom(src, 0, src.size());

src.close();

dst.close();

Toast.makeText(getBaseContext(), backupDB.toString(),

Toast.LENGTH_LONG).show();

}

} catch (Exception e) {

Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)

.show();

}

}

總結

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