无法恢复活动的错误 [英] Unable to resume Activity error

问题描述

我的活动包含此code，以获得SD卡上的所有图片：

My Activity contains this code to get all images on the SD card:

String[] projection = {MediaStore.Images.Media._ID,
                       MediaStore.Images.Media.DATA,
                       MediaStore.Images.ImageColumns.DATA};  
Cursor cursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                             projection, null, null,
                             MediaStore.Images.Media._ID); 
int count = cursor.getCount();
int image_path_index = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
int i;
for(i = 0; i < count; i++) {
    cursor.moveToPosition(i);
    String p = cursor.getString(image_path_index);
    fd.addToPhonePhoto(p);
}
cursor.close();

而活动中恢复的发生：

The occurred while the Activity was resuming:

03-14 14：06：48.380：E / AndroidRuntime（20793）：java.lang.RuntimeException的：无法恢复活动{}：java.lang.RuntimeException的：无法恢复活动{}：android.database.StaleDataException ：试图访问一个游标已经关闭后

03-14 14:06:48.380: E/AndroidRuntime(20793): java.lang.RuntimeException: Unable to resume activity {}: java.lang.RuntimeException: Unable to resume activity {}: android.database.StaleDataException: Attempted to access a cursor after it has been closed.

这仅发生在Android 4.0。如果在Android 2.x或3.x中，它工作正常。但是，如果我改变它选择在开发人员选项中的不保留活动选项的系统设置。 该错误不显示。

It only occurs on Android 4.0. If on Android 2.x or 3.x, it works normally. But if I change the system setting which selects the "don't keep Activities" option in "Developer options". The error does not show.

我想修改我的code，以避免该错误不改变系统设置。我应该怎么办呢？

I want to modify my code to avoid this error without changing the system setting. How should I do it?

推荐答案

我想这是因为 managedQuery 通话+您关闭游标。从的<一的文档href="http://developer.android.com/reference/android/app/Activity.html#managedQuery%28android.net.Uri,%20java.lang.String%5B%5D,%20java.lang.String,%20java.lang.String%5B%5D,%20java.lang.String%29"><$c$c>managedQuery()方法：

I think this is because of the managedQuery call + you closing the cursor. From the docs of the managedQuery() method:

警告：不要调用close（）使用此方法得到的光标，   由于活动会替你在适当的时候。   但是，如果调用stopManagingCursor（光标）从一个游标   管理查询时，系统将不会自动关闭游标和，   在这种情况下，你必须调用close（）。

Warning: Do not call close() on a cursor obtained using this method, because the activity will do that for you at the appropriate time. However, if you call stopManagingCursor(Cursor) on a cursor from a managed query, the system will not automatically close the cursor and, in that case, you must call close().

将光标为Android系统来管理，不叫 cursor.close（）;

Leave the cursor for the Android system to manage and don't call cursor.close();.

注： 的 managedQuery 法德precated和应避免，实施<一href="http://developer.android.com/reference/android/content/CursorLoader.html"><$c$c>CursorLoaders代替。关于 CursorLoaders 更多信息可以在<一个发现href="http://developer.android.com/guide/components/loaders.html"><$c$c>developer.android.com.

Note: The managedQuery method is deprecated and it should be avoided, implement CursorLoaders instead. More info about CursorLoaders can be found at developer.android.com.

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