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我想将我的数据库文件存储在可绘制的文件夹中,然后在SD卡中创建其备份。虽然试图做到这一点我findind问题在什么路径给予可绘制的文件夹。我这样做:数据库存储和检索
尝试{
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
//db = openOrCreateDatabase("demodatabase.sqlite",SQLiteDatabase.CREATE_IF_NECESSARY,null);
currentDBPath = "//drawable//demodatabase.sqlite";
db=openOrCreateDatabase(uri.toString(), 0, null);
System.out.println("====="+ currentDBPath);
backupDBPath = "{demodatabase.sqlite}";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
} }catch (Exception e) {}
Thanx提前。
我得到空指针异常得到一个输入流对这些文件的情况下没有采取值...为什么如此?] – Piyush 2011-04-13 12:44:42
您是否使用SQLiteOpenHelper类作为超类? – senola 2011-04-13 12:58:43
不,我只是扩展活动..... – Piyush 2011-04-13 13:04:59