ANDROID - 將數據插入數據庫，報告無法啓動活動ComponentInfo：java.lang.NullPointerException

我已經被Stucked以獲取資產文件夾中的數據（包含插入SQL）到數據庫中。我試過了很大的變化，但我比較報告：ANDROID - 將數據插入數據庫，報告無法啓動活動ComponentInfo：java.lang.NullPointerException

"Unable to start activity ComponentInfo{com.restaurant.sesame/com.restaurant.sesame.Food}: java.lang.NullPointerException"

這是我food.txt文件內容：

INSERT INTO Food (name,detail,price)VALUES ('Cow Rib Steak', '1h 37m Shipping: $11.00', '11.00') 
INSERT INTO Food (name,detail,price)VALUES ('Cow Rib Steak', '1h 37m Shipping: $11.00', '11.00') 
INSERT INTO Food (name,detail,price)VALUES ('Cow Rib Steak', '1h 37m Shipping: $11.00', '11.00') 
INSERT INTO Food (name,detail,price)VALUES ('Cow Rib Steak', '1h 37m Shipping: $11.00', '11.00')

我一直在掙扎了很長一段時間。我訪問了很多網站來研究這一點。有人可以提出一個更堅實的方法來幫助我解決這個錯誤嗎？

public class Restaurant extends Activity { 
public static final String KEY_ROWID = "_id"; 
public static final String KEY_NAME = "name"; 
public static final String KEY_DETAIL = "detail"; 
public static final String KEY_PRICE = "price"; 


private static final String DATABASE_NAME ="Restaurantdb"; 
private static final String DATABASE_TABLE ="Food"; 
private static final int DATABASE_VERSION = 1; 


private SQLiteDatabase ourDatabase; 
private final Context ourContext; 
private DBHelper ourHelper; 

InputStream input; 
AssetManager assetManager = getAssets(); 
static String value; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    try { 
      input = assetManager.open("food.txt"); 

        int size = input.available(); 
        byte[] buffer = new byte[size]; 
        input.read(buffer); 
        input.close(); 

        // byte buffer into a string 
        value = new String(buffer); 


     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      } 
} 

private static class DBHelper extends SQLiteOpenHelper{ 

    public DBHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 

    } 

    public void onCreate(SQLiteDatabase db) 
    { 
     db.execSQL("CREATE TABLE Food (" + KEY_ROWID +" INTEGER PRIMARY KEY AUTOINCREMENT, " 
        +KEY_NAME+" TEXT NOT NULL, "+KEY_DETAIL+ " TEXT NOT NULL, " + KEY_PRICE+ " DECIMAL (18,2) NOT NULL);" 
       ); 
     db.execSQL("CREATE TABLE Bill (_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL,"+ 
       " price DECIMAL (18,2) NOT NULL, quantity INTEGER NOT NULL, total DECIMAL (18,2) NOT NULL);" 
      ); 



     db.rawQuery(value, null); 

     Log.w("my app", "insert data into NEW DB"); 
    }

來源

2012-04-01 shoujo_sm

給一些stacktrace t o找到問題出在哪裏 – Chet 2012-04-01 13:13:42

stacktrace？對不起，我不明白。 – 2012-04-01 14:08:47

我的意思是你所謂的「補償報告」，即「無法啓動..」。請發佈剩餘的線路，以便跟蹤問題的出處！ – Chet 2012-04-01 14:21:06

我認爲你是在錯誤的尾巴:)

無法啓動活動ComponentInfo

搜索，所以我認爲這個問題可能是本次活動的onCreate（）

---對不起，我不能發表評論您的帖子：/

來源

2012-04-13 07:38:48 Mario

你..我也這麼認爲......但似乎找不到任何線索來解決它... – 2012-04-20 00:19:45

ANDROID - 將數據插入數據庫，報告無法啓動活動ComponentInfo：java.lang.NullPointerException

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