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我有一个 TimerTask 导致我的应用程序在我转到不同的 Intent 时崩溃。这是错误：

06-06 02:45:54.884: E/AndroidRuntime(602): FATAL EXCEPTION: main
06-06 02:45:54.884: E/AndroidRuntime(602): android.database.StaleDataException: Access closed cursor
06-06 02:45:54.884: E/AndroidRuntime(602):  at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:217)
06-06 02:45:54.884: E/AndroidRuntime(602):  at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:41)
06-06 02:45:54.884: E/AndroidRuntime(602):  at com.myapp.ExerciseActivity$TickClass$1.run(ExerciseActivity.java:221)
06-06 02:45:54.884: E/AndroidRuntime(602):  at android.os.Handler.handleCallback(Handler.java:587)
06-06 02:45:54.884: E/AndroidRuntime(602):  at android.os.Handler.dispatchMessage(Handler.java:92)
06-06 02:45:54.884: E/AndroidRuntime(602):  at android.os.Looper.loop(Looper.java:123)
06-06 02:45:54.884: E/AndroidRuntime(602):  at android.app.ActivityThread.main(ActivityThread.java:3683)
06-06 02:45:54.884: E/AndroidRuntime(602):  at java.lang.reflect.Method.invokeNative(Native Method)
06-06 02:45:54.884: E/AndroidRuntime(602):  at java.lang.reflect.Method.invoke(Method.java:507)
06-06 02:45:54.884: E/AndroidRuntime(602):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-06 02:45:54.884: E/AndroidRuntime(602):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-06 02:45:54.884: E/AndroidRuntime(602):  at dalvik.system.NativeStart.main(Native Method)

现在这里是 TimerTask 的代码：

public class TickClass extends TimerTask
{
    private int columnIndex;

    @Override
    public void run() {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if (cursor != null) {
                        if (_index == 1) {
                            columnIndex = cursor.getColumnIndex(MySQLiteHelper.COLUMN_IMAGE_2);
                            _index = 2;
                        }
                        else {
                            columnIndex = cursor.getColumnIndex(MySQLiteHelper.COLUMN_IMAGE_1);
                            _index = 1; 
                        }   

                        String image_1 = cursor.getString(columnIndex);
                        image_1 = image_1.replace(".png", "");
                        int resourceId = getResources().getIdentifier(getPackageName() + ":drawable/" + image_1, null, null);
                        image_1_view.setImageDrawable(getResources().getDrawable(resourceId));
                    }
                }
            });
        }
}

它所做的只是为 PNG 制作动画。

请注意我是如何添加if (cursor != null)条件语句的，但它并没有修复它。我不知道如何解决这个问题，是不是因为它在 UI 线程上运行，所以即使我已经离开 Activity，它仍在运行，但光标不再存在，因为它与活动？

编辑：

我已经通过取消（）TimerTask onPause（）来修复强制关闭。但是，现在当我返回 Activity 时，图像不再是动画的。有什么想法吗？

4

2 回答 2

0

That's not appropriate way.

If you are used cursor as a global variable then you can used in runOnUiThread but my opinion is you have to used cursor this way.

//get the record in cursor
if(Cur.getCount()!=0){
    if(Cur.moveToFirst()){
        do{
        //here you can manipulate your record

        }while(Cur.moveToNext());

    }
}
Cur.close();

This is perfect way try and run.

于 2013-06-06T04:37:56.293 回答
0

在我的 onPause() 中取消 TimerTask 解决了这个问题。

于 2013-06-06T20:29:13.187 回答