非法状态异常:SQLite 游标已关闭

Question

下面我发布了日志猫的详细信息。请告诉我如何解决这个问题。

11-21 14:49:33.604: E/AndroidRuntime(1721): FATAL EXCEPTION: main
11-21 14:49:33.604: E/AndroidRuntime(1721): java.lang.RuntimeException: Unable to resume activity {com.example.shaktitool/com.example.shaktitool.Product}: java.lang.IllegalStateException: trying to requery an already closed cursor  android.database.sqlite.SQLiteCursor@41334490
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2575)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2603)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.os.Looper.loop(Looper.java:137)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.ActivityThread.main(ActivityThread.java:4745)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at java.lang.reflect.Method.invokeNative(Native Method)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at java.lang.reflect.Method.invoke(Method.java:511)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at dalvik.system.NativeStart.main(Native Method)
11-21 14:49:33.604: E/AndroidRuntime(1721): Caused by: java.lang.IllegalStateException: trying to requery an already closed cursor  android.database.sqlite.SQLiteCursor@41334490
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.Activity.performRestart(Activity.java:5051)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.Activity.performResume(Activity.java:5074)
11-21 14:49:33.604: E/AndroidRuntime(1721):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2565)
11-21 14:49:33.604: E/AndroidRuntime(1721):     ... 10 more

我的Java代码：

package com.example.shaktitool;
    import android.app.Activity;
    import android.content.Intent;
    import android.database.Cursor;
    import android.os.Bundle;
    import android.view.KeyEvent;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.ListView;
    import android.widget.SimpleCursorAdapter;

    public class Product extends Activity {
    protected static final String PRODUCT_REQUEST = null;
    private SQLiteAdapterPro mySQLiteAdapter;
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.product);
            Intent intent = getIntent();
            ListView list = (ListView)findViewById(R.id.content_list);

            /*
             *  Create/Open a SQLite database
             *  and fill with dummy content
             *  and close it
             */
            mySQLiteAdapter = new SQLiteAdapterPro(this);
            mySQLiteAdapter.openToWrite();
            mySQLiteAdapter.deleteAll();
            mySQLiteAdapter.insert("ELECTRONICS-COMPUTERS");
            mySQLiteAdapter.insert("DESKTOPS");
            mySQLiteAdapter.insert("NOTEBOOKS");
            mySQLiteAdapter.close();
            /*
             *  Open the same SQLite database
             *  and read all it's content.
             */
            mySQLiteAdapter = new SQLiteAdapterPro(this);
            mySQLiteAdapter.openToRead();
            Cursor cursor = mySQLiteAdapter.queueAll();
            startManagingCursor(cursor);
            String[] from = new String[]{SQLiteAdapter.KEY_CONTENT};
            int[] to = new int[]{R.id.text};
            SimpleCursorAdapter cursorAdapter =
                new SimpleCursorAdapter(this, R.layout.row, cursor, from, to);
            list.setAdapter(cursorAdapter);
            list.setOnItemClickListener( new OnItemClickListener() {
                public void onItemClick(AdapterView<?> arg0, View arg1,
                        int position, long arg3) {
                    switch(position){
                    case 1 : Intent intent = new Intent(Product.this, Desktop.class);
                             startActivity(intent);
                             break;
                    case 2 : Intent intent1 = new Intent(Product.this, Notebook.class);
                             startActivity(intent1);
                             break;                        

                    }
                }   
            });

            mySQLiteAdapter.close();

        }
    }

Answer 1

尝试重新查询已关闭的游标android.database.sqlite.SQLiteCursor@41334490

您正在尝试访问已关闭的游标。

如果仍需要游标，请不要关闭游标，也不要进行新的数据库查询以获取另一个游标。

Answer 2

错误很明显。

java.lang.IllegalStateException：尝试重新查询已关闭的 光标。

很难说出您如何排队已经关闭的光标。但一个猜测是您可能正在使用 startManagingCursor（） 并传递已经关闭的光标。

Answer 3

首先：你应该阅读StackOverflow的FAQ。

第二：通过阅读您的日志猫，我明白：

java.lang.RuntimeException: Unable to resume activity {com.example.shaktitool/com.example.shaktitool.Product}: java.lang.IllegalStateException: trying to requery an already closed cursor  android.database.sqlite.SQLiteCursor@41334490
Caused by: java.lang.IllegalStateException: trying to requery an already closed cursor  android.database.sqlite.SQLiteCursor@41334490

所以：trying to requery an already closed cursor意味着你对SQLite做错了什么。发布您的 Java 代码，您将获得帮助。