數據庫存儲和檢索

Question

我想將我的數據庫文件存儲在可繪製的文件夾中，然後在SD卡中創建其備份。雖然試圖做到這一點我findind問題在什麼路徑給予可繪製的文件夾。我這樣做：

嘗試{

 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。

Answer 1

你會把這些文件不是在繪製文件夾，但在你的資產文件夾，你可以通過使用

context.getAssets().open("demodatabase.sqlite")