listview嵌套GridView顯示不全的問題

private long exitTime = 0;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){

        if (currentTabIndex != 0) { // 如果目前不是首頁，先傳回首頁
            if (null != mineFragment.popupWindow && mineFragment.popupWindow.isShowing()) {
                mineFragment.popupWindow.dismiss();
            }
            showFragment(0);
            return false;
        }else if((System.currentTimeMillis()-exitTime) > 2000){
            Toast.makeText(getApplicationContext(), "再按一次退出程式", Toast.LENGTH_SHORT).show();
            exitTime = System.currentTimeMillis();
        } else {
            finish();
            JActivityManager.getInstance().closeAllActivity();
            System.exit(0);
        }
        return true;
    }
    return super.onKeyDown(keyCode, event);
}