Android SQLite錯誤導致getWriteableDatabase（）

Question

我是相當新的Android，並試圖創建一個數據庫，其中包含一個表來存儲電子郵件地址，用戶名和密碼。將破發點出現下面的代碼行的程序之後被扔了問題：

SQLiteDatabase database = this.getWriteableDatabase(); 

下面是圍繞上面的一行代碼：

// Create A User 
public boolean createUser(String userEmail, String userName, String userPassword) { 
    ContentValues values = new ContentValues(); 
    values.put(KEY_USER_EMAIL, userEmail); 
    values.put(KEY_USER_NAME, userName); 
    values.put(KEY_USER_PASSWORD, userPassword); 

    SQLiteDatabase database = this.getWritableDatabase(); 

    database.close(); 
} 

當試圖創建一個用戶我得到以下錯誤：

java.lang.IllegalStateException: Could not execute method of the activity 
      at android.view.View$1.onClick(View.java:3052) 
      at android.view.View.performClick(View.java:3519) 
      at android.view.View$PerformClick.run(View.java:14140) 
      at android.os.Handler.handleCallback(Handler.java:605) 
      at android.os.Handler.dispatchMessage(Handler.java:92) 
      at android.os.Looper.loop(Looper.java:137) 
      at android.app.ActivityThread.main(ActivityThread.java:4424) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.reflect.InvocationTargetException 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at android.view.View$1.onClick(View.java:3047) 
            at android.view.View.performClick(View.java:3519) 
            at android.view.View$PerformClick.run(View.java:14140) 
            at android.os.Handler.handleCallback(Handler.java:605) 
            at android.os.Handler.dispatchMessage(Handler.java:92) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:4424) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554) 
            at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.IllegalStateException: database /data/data/com.pastpapercreator.chemistrypastpapercreator/databases/chemistryPastPaperCreator (conn# 0) already closed 
      at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2082) 
      at android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2088) 
      at android.database.sqlite.SQLiteDatabase.endTransaction(SQLiteDatabase.java:690) 
      at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:176) 
      at com.pastpapercreator.chemistrypastpapercreator.helper.DatabaseHelper.createUser(DatabaseHelper.java:111) 
      at com.pastpapercreator.chemistrypastpapercreator.CreateAccount.createAccount(CreateAccount.java:83) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at android.view.View$1.onClick(View.java:3047) 
            at android.view.View.performClick(View.java:3519) 
            at android.view.View$PerformClick.run(View.java:14140) 
            at android.os.Handler.handleCallback(Handler.java:605) 
            at android.os.Handler.dispatchMessage(Handler.java:92) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:4424) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554) 
            at dalvik.system.NativeStart.main(Native Method) 

任何幫助，非常感謝。

下面是用於創建數據庫的代碼：

// User Table Column Names 
private static final String KEY_USER_ID = "uId"; 
private static final String KEY_USER_EMAIL = "uEmail"; 
private static final String KEY_USER_NAME = "uName"; 
private static final String KEY_USER_PASSWORD = "uPassword"; 

// User Table Creation Statement 
private static final String CREATE_TABLE_USER = "CREATE TABLE " + TABLE_USER + 
"(" + KEY_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_USER_EMAIL + " TEXT," + KEY_USER_NAME + " TEXT," + KEY_USER_PASSWORD + " TEXT" + ")"; 

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

@Override 
    public void onCreate(SQLiteDatabase database) { 
     // Create Required Tables 
     database.execSQL(CREATE_TABLE_USER); 

     database.close(); 
    } 

Answer 1

試試這個在您的數據庫助手類 檢查克里特查詢

// Database creation sql statement 
    private static final String DATABASE_CREATE = "create table " 
    + TABLE_COMMENTS + "(" + COLUMN_ID 
    + " integer primary key autoincrement, " + COLUMN_COMMENT 
    + " text not null);"; 

    public MySQLiteHelper(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 
    @Override 
    public void onCreate(SQLiteDatabase database) { 
    database.execSQL(DATABASE_CREATE); 
    }