在活动组android中未调用backpress

在我的android应用程序中，我在选项卡中使用活动组，同时维护以前屏幕的列表。问题是，如果我们在屏幕加载后立即按back，则不会调用Backpress方法并退出应用程序，但是，如果我在延迟后做同样的操作，比如说在屏幕上30秒，它会按预期工作。根本无法解决问题。我已经调试了代码，并注意到新屏幕已添加到堆栈列表中，但backpress方法本身未被调用。我尝试在activity和tabgroup类中实现backpress，但没有用。请告诉我知道我哪里出错了。我用来添加活动的代码是

Intent intent = new Intent(context, TrialActivity.class);
intent.putExtra("feedId", moreitems.get(arg2).getItem_id());
intent.putExtra("heading", moreitems.get(arg2).getItem_name());
TabGroupActivity parentActivity = (TabGroupActivity) ((Activity) context)
                    .getParent();
 parentActivity.startChildActivity(moreitems.get(arg2).getItem_name()
            + Calendar.getInstance().getTimeInMillis(), intent);

MyTabgroup类是

@SuppressWarnings("deprecation")
public class TabGroupActivity extends ActivityGroup {

    private ArrayList<String> mIdList;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (mIdList == null)
            mIdList = new ArrayList<String>();
    }
    @Override
    protected void onPause()
    {
        super.onPause();
    }

    @Override
    protected void onResume() {
        // to start the first activity every time on reload( on focus of tab).

        // remove the search activity if it is in the stack
        if (mIdList != null && mIdList.size() > 0) {
            int index = -1;
            for (int i = 0; i < mIdList.size(); i++) {
                String firstId = mIdList.get(i);
                if (firstId != null
                        && "search".equalsIgnoreCase(firstId.substring(0,
                                firstId.length() - 1))) {
                    index = i;
                }

            }
            if (index != -1) {
                LocalActivityManager manager = getLocalActivityManager();
                manager.destroyActivity(mIdList.get(index), true);
                mIdList.remove(index);
                index--;
                String lastId = mIdList.get(index);

                Intent lastIntent = manager.getActivity(lastId).getIntent();

                Window newWindow = manager.startActivity(lastId, lastIntent);
                setContentView(newWindow.getDecorView());
            }

        }
        super.onResume();
    }



    /**
     * This is called when a child activity of this one calls its finish method.
     * This implementation calls {@link LocalActivityManager#destroyActivity} on
     * the child activity and starts the previous activity. If the last child
     * activity just called finish(),this activity (the parent), calls finish to
     * finish the entire group.
     */

    @Override
    public void finishFromChild(Activity child) {

        LocalActivityManager manager = getLocalActivityManager();
        int index = mIdList.size() - 1;

        if (index < 1) {
            Alerts.exit("Confirm",
                    "Do you really wish to exit from iDream Media?", this);
            return;
        }

        manager.destroyActivity(mIdList.get(index), true);
        mIdList.remove(index);
        index--;
        String lastId = mIdList.get(index);
        Intent lastIntent = manager.getActivity(lastId).getIntent();

        Window newWindow = manager.startActivity(lastId, lastIntent);
        setContentView(newWindow.getDecorView());
    }

    /**
     * Starts an Activity as a child Activity to this.
     * 
     * @param Id
     *            Unique identifier of the activity to be started.
     * @param intent
     *            The Intent describing the activity to be started.
     * @throws android.content.ActivityNotFoundException.
     */
    public void startChildActivity(String Id, Intent intent) {

        Window window = getLocalActivityManager().startActivity(Id,
                intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP));
        if (window != null) {
            mIdList.add(Id);
            setContentView(window.getDecorView());
        }
    }

    /**
     * The primary purpose is to prevent systems before
     * android.os.Build.VERSION_CODES.ECLAIR from calling their default
     * KeyEvent.KEYCODE_BACK during onKeyDown.
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // onBackPressed();
            // preventing default implementation previous to
            // android.os.Build.VERSION_CODES.ECLAIR
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    /**
     * Overrides the default implementation for KeyEvent.KEYCODE_BACK so that
     * all systems call onBackPressed().
     */
    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            onBackPressed();
            return true;
        }
        return super.onKeyUp(keyCode, event);
    }

    /**
     * If a Child Activity handles KeyEvent.KEYCODE_BACK. Simply override and
     * add this method.
     */
    @Override
    public void onBackPressed() {
        int length = mIdList.size();
        if (length > 1) {
            Activity current = getLocalActivityManager().getActivity(
                    mIdList.get(length - 1));
            current.finishFromChild(current);
        }
    }

}

@SuppressWarnings（“弃用”）
公共类选项卡GroupActivity扩展了ActivityGroup{
私有ArrayList中间列表；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
如果（中间列表==null）
mIdList=新的ArrayList（）；
}
@凌驾
受保护的void onPause（）
{
super.onPause（）；
}
@凌驾
受保护的void onResume（）{
//每次重新加载时启动第一个活动（在选项卡的焦点上）。
//如果搜索活动在堆栈中，请将其删除
if（mIdList！=null&&mIdList.size（）>0）{
int指数=-1；
对于（int i=0；i1）{
当前活动=getLocalActivityManager（）.getActivity(
get（长度-1））；
当前。finishFromChild（当前）；
}
}
}

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请告诉我哪里出了问题。

我终于发现问题是由于标签顶部显示的广告造成的。参考下面的链接，问题得到了解决。