Android-newbie玩SimpleCursorAdapter，我遇到了一些我无法解决的问题。
这是代码（省略导入）：
package se.ribit.bb;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class CountyBrowser extends Activity {
private AVApplication audiovideo;
private final String LOG_TAG = AVApplication.LOG_TAG;
private final String TAG = "=== " + CountyBrowser.class.getSimpleName() + ": ";
static final String[] FROM = { LocationDB.C_NAME};
static final int[] TO = { R.id.locationName };
// DB dbHelper;
private Cursor cursor;
private ListView listItems;
private SimpleCursorAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(LOG_TAG, TAG + "onCreate");
setContentView(R.layout.county_main_view);
// View for the adapter
listItems = (ListView) findViewById(R.id.county_listview);
// Get the application context
audiovideo = (AVApplication) getApplication();
audiovideo.httpCommand(Commands.GET_COUNTIES, null);
}
@Override
protected void onResume() {
super.onResume();
showCounties();
}
public void showCounties() {
Log.d(LOG_TAG, TAG + "refreshItemsList();");
// Get a cursor with all item updates
cursor = audiovideo.getLocationDB().getCounties();
startManagingCursor(cursor);
// Setup the adapter
adapter = new SimpleCursorAdapter(this, R.layout.county_listview_item, cursor, FROM, TO);
listItems.setAdapter(adapter);
listItems.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
int countyID = cursor.getInt(cursor.getColumnIndex(LocationDB.C_ID));
String countyName = cursor.getString(cursor.getColumnIndex(LocationDB.C_NAME));
String foo = String.format(TAG + "Clicked ID #%d (%s)", countyID, countyName);
Log.i(LOG_TAG, foo);
// Show the item in a new activity
Intent apan = new Intent(audiovideo, MunicipalBrowser.class);
apan.putExtra("countyID", countyID);
startActivity(apan);
}
});
} // refreshItemsList
}
I.e：这会打开一个列表视图，并在我的区域周围填充一堆县名。点击某个县时，会启动另一项活动（代码几乎完全相同），显示该县的市政当局。
代码主要起作用。偶尔会在LogView中弹出这些行（每个listview-cell有一个集合）：
10-11 09:28:06.601: INFO/dalvikvm(244): Uncaught exception thrown by finalizer (will be discarded):
10-11 09:28:06.641: INFO/dalvikvm(244): Ljava/lang/IllegalStateException;: Finalizing cursor android.database.sqlite.SQLiteCursor@44c7e808 on null that has not been deactivated \
或关闭 10-11 09：28：06.651：INFO / dalvikvm（244）：在android.database.sqlite.SQLiteCursor.finalize（SQLiteCursor.java:596） 10-11 09：28：06.651：INFO / dalvikvm（244）：at dalvik.system.NativeStart.run（Native Method）
我不明白为什么我会得到这些，但由于模拟器没有崩溃我没有太多麻烦。
现在出现严重错误：当我的listview启动并且我没有点击任何单元格一段时间（可能是5分钟），然后单击时，模拟器会崩溃并在LogCat中输出：< / p>
10-11 11:45:22.591: ERROR/AndroidRuntime(255): Uncaught handler: thread main exiting due to uncaught exception
10-11 11:45:22.682: ERROR/AndroidRuntime(255): java.lang.RuntimeException: Unable to start activity ComponentInfo{se.ribit.bb/se.ribit.bb.TownBrowser}: android.database.sqlite.SQLiteException: Unable to close due to unfinalised statements
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.os.Handler.dispatchMessage(Handler.java:99)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.os.Looper.loop(Looper.java:123)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.ActivityThread.main(ActivityThread.java:4363)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at java.lang.reflect.Method.invokeNative(Native Method)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at java.lang.reflect.Method.invoke(Method.java:521)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at dalvik.system.NativeStart.main(Native Method)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): Caused by: android.database.sqlite.SQLiteException: Unable to close due to unfinalised statements
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.database.sqlite.SQLiteDatabase.dbclose(Native Method)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.database.sqlite.SQLiteDatabase.onAllReferencesReleased(SQLiteDatabase.java:254)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.database.sqlite.SQLiteClosable.releaseReference(SQLiteClosable.java:42)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.database.sqlite.SQLiteProgram.onAllReferencesReleasedFromContainer(SQLiteProgram.java:76)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:799)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.database.sqlite.SQLiteDatabase.close(SQLiteDatabase.java:786)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at se.ribit.bb.LocationDB.updateTowns(LocationDB.java:291)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at se.ribit.bb.AVApplication.httpCommand(AVApplication.java:217)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at se.ribit.bb.TownBrowser.onCreate(TownBrowser.java:44)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
10-11 11:45:22.682: ERROR/AndroidRuntime(255): ... 11 more
谁能告诉我这里发生了什么？
答案 0 :(得分：1)
使用
释放OnDestroy方法中的CursorstopManagingCursor(c);
哦，你应该使用CursorLoader，不推荐使用startManagingCursor（）。
Loader API带有兼容性套件的旧设备，请参阅：http://mobile.tutsplus.com/tutorials/android/android-compatibility-working-with-fragments/
答案 1 :(得分：0)
很难在不看代码的情况下知道，但您可能在关闭光标之前关闭了数据库：SQLite Exception in android
这是错误所在，所以你应该在那里检查：在se.ribit.bb.LocationDB.updateTowns（LocationDB.java:291）