android 数据库已经关闭 onResume
我的应用程序有一个问题，如果我返回到某个活动，我会收到数据库已关闭的错误：
ERROR/AndroidRuntime(3566): Caused by: java.lang.IllegalStateException: database /data/data/com.kempville.app/databases/MyDB already closed
我实例化、打开、实例化游标、执行查询、关闭游标并关闭数据库，所有这些都在期间调用的方法中进行onResume()。我不知道当此活动回到前台时调用 onResume 时假定打开的内容。
private void getMydata() {
MyDb db;
db = new MyDB(this);
db.open();
Cursor c = db.getInfo(code);
startManagingCursor(c);
if (c.moveToFirst()) {
name = c.getString(c.getColumnIndex("name"));
}
c = fdb.getType(myArray.getString("type"));
startManagingCursor(c);
if (c.moveToFirst()) {
type = c.getString(c.getColumnIndex("type"));
}
c.close();
db.close();
my application has an issue where if I go back to an activity I get an error that the database has been closed:
ERROR/AndroidRuntime(3566): Caused by: java.lang.IllegalStateException: database /data/data/com.kempville.app/databases/MyDB already closed
I instantiate, open, instatiate a cursor, do the query, close the cursor and close the database all within a method called during onResume(). I don't know what is assumed to be open whenever onResume gets called when this activity comes back to the front.
private void getMydata() {
MyDb db;
db = new MyDB(this);
db.open();
Cursor c = db.getInfo(code);
startManagingCursor(c);
if (c.moveToFirst()) {
name = c.getString(c.getColumnIndex("name"));
}
c = fdb.getType(myArray.getString("type"));
startManagingCursor(c);
if (c.moveToFirst()) {
type = c.getString(c.getColumnIndex("type"));
}
c.close();
db.close();
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评论（1）
似乎 startManagingCursor 会尝试关闭它，尽管您自己已经关闭了它。要么删除 startManagingCursor （它已被弃用），要么最好调用 stopManagingCursor
Seems that startManagingCursor will try to close it, though you've closed it yourself. Either drop the startManagingCursor (it's getting deprecated) or better call stopManagingCursor