我正在编写ListActivity，并且我一直在尝试重新打开一个已关闭的对象时遇到IllegalStateException。 （错误指向我的setListAdapter（）方法。）任何想法？我已尝试使用startManagingCursor（）以及在onPause（）中调用cursor.close（），但没有任何东西可以消除错误。
NewsActivity.class
package com.lakesidebaptist.lakesidelife.ui.Content;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter.ViewBinder;
import android.view.View;
import android.widget.ListView;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockListActivity;
import com.actionbarsherlock.view.MenuItem;
import com.lakesidebaptist.lakesidelife.MainActivity;
import com.lakesidebaptist.lakesidelife.R;
import com.lakesidebaptist.lakesidelife.update.database.dbAdapter;
/**
* The activity that shows all the news items.
*
* @author andrew
*/
public class NewsActivity extends SherlockListActivity {
private Cursor cursor = null;
private SimpleCursorAdapter adapter = null;
dbAdapter dba = null;
// Arrays
private static String[] FROM = {"title", "body"};
private static int[] TO = {R.id.news_title, R.id.news_body};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar actionBar = getSupportActionBar();
// Makes home button visible
actionBar.setHomeButtonEnabled(true);
// Allows home button to be used to navigate up
actionBar.setDisplayHomeAsUpEnabled(true);
}
/*
* This method is called when the user clicks the home button to go back. It
* stops this activity and returns the user to the home screen.
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
onStop();
return true;
}
@Override
protected void onPause() {
super.onPause();
//dba.close();
}
@Override
protected void onResume() {
super.onResume();
//Setting up the database adapter
dba = new dbAdapter(this);
dba.open();
// Getting the Cursor of the requested data
cursor = dba.read("news", null, null);
//startManagingCursor(cursor);
adapter = new SimpleCursorAdapter(this, R.layout.news_list, cursor, FROM, TO, 0);
setListAdapter(adapter);
setTitle(R.string.news);
}
}
logcat的
01-27 21:41:42.330: E/AndroidRuntime(986): FATAL EXCEPTION: main
01-27 21:41:42.330: E/AndroidRuntime(986): java.lang.RuntimeException: Unable to resume activity {com.lakesidebaptist.lakesidelife/com.lakesidebaptist.lakesidelife.ui.Content.NewsActivity}: java.lang.IllegalStateException: attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT * FROM 'news';)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3128)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3143)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2684)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.os.Handler.dispatchMessage(Handler.java:99)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.os.Looper.loop(Looper.java:123)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-27 21:41:42.330: E/AndroidRuntime(986): at java.lang.reflect.Method.invokeNative(Native Method)
01-27 21:41:42.330: E/AndroidRuntime(986): at java.lang.reflect.Method.invoke(Method.java:521)
01-27 21:41:42.330: E/AndroidRuntime(986): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-27 21:41:42.330: E/AndroidRuntime(986): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-27 21:41:42.330: E/AndroidRuntime(986): at dalvik.system.NativeStart.main(Native Method)
01-27 21:41:42.330: E/AndroidRuntime(986): Caused by: java.lang.IllegalStateException: attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT * FROM 'news';)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:34)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:64)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:283)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:264)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.support.v4.widget.CursorAdapter.getCount(CursorAdapter.java:202)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.widget.ListView.setAdapter(ListView.java:436)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ListActivity.setListAdapter(ListActivity.java:267)
01-27 21:41:42.330: E/AndroidRuntime(986): at com.lakesidebaptist.lakesidelife.ui.Content.NewsActivity.onResume(NewsActivity.java:77)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.Activity.performResume(Activity.java:3823)
01-27 21:41:42.330: E/AndroidRuntime(986): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3118)
01-27 21:41:42.330: E/AndroidRuntime(986): ... 12 more
答案 0 :(得分：1)
attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT * FROM 'news';)
似乎你在这里返回一个已经关闭的光标：
cursor = dba.read("news", null, null);
检查你是否在dbAdapter read（）方法中关闭了游标 如果您发布dbAdapter类，它将会有所帮助。