android– 为什么isItemChecked()在ActionMode中返回true？

概述我已经设置了一个ActionMode回调函数,用作使用项目的ActionBarSherlock中的上下文ActionBar(CAB).我正在尝试设置多个选择,以便我可以删除ListView中的多个项目.我注意到在调试时,当上下文ActionBar(CAB)未打开并且我在我触摸的列表项上调用isItemChecked()时,它会返回false.但是

我已经设置了一个ActionMode回调函数,用作使用项目的ActionbarSherlock中的上下文Actionbar(CAB).

我正在尝试设置多个选择,以便我可以删除ListVIEw中的多个项目.

我注意到在调试时,当上下文Actionbar(CAB)未打开并且我在我触摸的列表项上调用isItemChecked()时,它会返回false.但是当CAB打开时,我触摸的项目(我以前没有碰过)在调用isItemChecked()时返回true.然后当我从getCheckedItemIDs()调用数组上的delete时,该数组不包含先前为isItemChecked()返回true的项.

有没有人见过这个？

@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.habit);    habitListVIEw = (ListVIEw)findVIEwByID(R.ID.habitsListVIEw);    habitListVIEw.setAdapter(mAdapter);    habitListVIEw.setChoiceMode(AbsListVIEw.CHOICE_MODE_MulTIPLE);    habitListVIEw.setItemsCanFocus(false);    habitListVIEw.setonItemLongClickListener(new MyOnItemLongClickListener());    habitListVIEw.setonItemClickListener(new OnItemClickListener() {        @OverrIDe        public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw, int position, long ID) {            if (habitListVIEw.isItemChecked(position)) { // for deBUGging, returns false here                                                         // when CAB isnt up.                int h = 2;            }            // handle differently when CAB is on.            if (mMode != null) {                if (habitListVIEw.isItemChecked(position)) { // returns true here when CAB is up                                                             // but this is the first time I'm                                                             // clicking the item                    habitListVIEw.setItemChecked(position, false);                    // turn CAB off if this is the last to be unchecked                    if (habitListVIEw.getCheckedItemIDs().length == 0) {                        mMode.finish();                    }                } else {                    habitListVIEw.setItemChecked(position, true);                }            } else {                // start detail/edit vIEw activity            }        }    });}@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getSupportMenuInflater().inflate(R.menu.activity_main, menu);    return true;}@OverrIDepublic boolean onoptionsItemSelected(MenuItem item) {    // Handle item selection    switch (item.getItemID()) {    case R.ID.menu_create:        Habit test = new Habit("FLOSS", "GOOD", "", "");        mDbHelper.createHabitEntry(test);        mAdapter.changeCursor(mDbHelper.getAllEntrIEs());        break;    }    return false;}private class MyOnItemLongClickListener implements OnItemLongClickListener {    @OverrIDe    public boolean onItemLongClick(AdapterVIEw<?> parent, VIEw vIEw, int position, long ID) {        habitListVIEw.setItemChecked(position, true);        mMode = startActionMode(new MyActionModeCallback());        return true;    }}private class MyActionModeCallback implements ActionMode.Callback {    @OverrIDe    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {        // Todo auto-generated method stub        return false;    }    @OverrIDe    public voID onDestroyActionMode(ActionMode mode) {        habitListVIEw.setonItemLongClickListener(new MyOnItemLongClickListener());    }    @OverrIDe    public boolean onCreateActionMode(ActionMode mode, Menu menu) {        mode.getMenuInflater().inflate(R.menu.main_long_click_context, menu);        habitListVIEw.setonItemLongClickListener(null);        return true;    }    @OverrIDe    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {        switch (item.getItemID()) {        case R.ID.menu_delete:            long[] selected = habitListVIEw.getCheckedItemIDs();            if (selected.length > 0) {                for (long ID : selected) {                    mDbHelper.deleteEntry(ID);                }            }            mAdapter.changeCursor(mDbHelper.getAllEntrIEs());            mode.finish();            break;        }        return true;    }};

解决方法:

所以对我有用的就是使用

   habitListVIEw.setonItemClickListener(new OnItemClickListener(){        @OverrIDe        public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw,                int position, long ID) {            //handle differently when CAB is on.            if (mMode != null){                vIEw.setSelected(!vIEw.isSelected());                updateCABTitle();                //turn CAB off if this is the last to be unchecked                    if (habitListVIEw.getCheckedItemIDs().length == 0){                        mMode.finish();                    }             } else {                //start detail/edit vIEw activity                Intent intent = new Intent(getApplicationContext(), HabitDetailActivity.class);                startActivity(intent);            }        }    });

和

    private class MyOnItemLongClickListener implements OnItemLongClickListener{    @OverrIDe    public boolean onItemLongClick(AdapterVIEw<?> parent, VIEw vIEw,                    int position, long ID) {            habitListVIEw.setItemChecked(position, true);            mMode = startActionMode(new MyActionModeCallback());            updateCABTitle();            return true;    }}

我真的不明白为什么setItemChecked()不适用于onItemClick()但似乎是onItemLongClick().看起来好像有一个默认的点击处理程序,它在AbsListVIEw.PerformItemClick()中被调用,它必须对已检查/未选中或某事进行一些切换.

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