在資產文件夾中打開sqlite數據庫時出錯

Question

我在獲取NullpointerException時嘗試訪問Assets文件夾中的db。在Assets文件夾中，db顯示爲紅色。

Image containing Db in Assets

public void createdatabase() throws IOException 
{ 
    System.out.println(" came into Create database "); 
    //Open your local db as the input stream 
    InputStream myinput = mycontext.getAssets().open(DB_NAME); 
    System.out.println(" myinput = "+myinput.toString()); 
    System.out.println(" Got input "); 

    // Path to the just created empty db 
    String outfilename = DB_PATH + DB_NAME; 
    System.out.println(" outfilename = "+outfilename); 

    //Open the empty db as the output stream 
    OutputStream myoutput = new FileOutputStream(outfilename); 

    // transfer byte to inputfile to outputfile 
    System.out.println(" created outputStream"); 
    byte[] buffer = new byte[1024]; 
    int length; 
    while ((length = myinput.read(buffer))>0) { 
     myoutput.write(buffer,0,length); 
    } 

    //Close the streams 
    myoutput.flush(); 
    myoutput.close(); 
    myinput.close(); 
} 

有沒有什麼辦法來檢查字符串的分貝值？

Answer 1

DB_NAME與資產文件夾中文件的名稱不匹配。

你爲什麼沒有告訴數值的任何原因？