在网格视图中无法更改图像按钮的图像资源

Question

我的应用程序中的GridView由多个ImageButtons组成。 轻按ImageButton时，该ImageButton的图像资源将更改。

当未点击ImageButton时，这是图像资源ID的int数组。

private final int mineIcons[] = 
{
    R.drawable.habit,
    R.drawable.story,
    R.drawable.submenu_voice_message,
    R.drawable.study,
    R.drawable.guess,
    R.drawable.poem,
    R.drawable.add
};

轻按ImageButton时，这是图像资源ID的int数组。

private final int mineIconsSelected[] = 
{
    R.drawable.habit_selected,
    R.drawable.story_selected,
    R.drawable.submenu_voice_message_selected,
    R.drawable.study_selected,
    R.drawable.guess_selected,
    R.drawable.poem_selected,
    R.drawable.add
};

加载此活动后，我希望GridView中的第一个ImageButton处于“轻击”状态。 所以我设置为默认图像资源的图像资源ID的这个int数组ImageButtons的时候ImageButtons被加载。

private final int mineIconsDefault[] = 
{
    R.drawable.habit_selected,
    R.drawable.story,
    R.drawable.submenu_voice_message,
    R.drawable.study,
    R.drawable.guess,
    R.drawable.poem,
    R.drawable.add
};

这是Fragment的完整代码

公共类MineFragment扩展了Fragment {私有最终静态String LOG_TAG =“ MineFragment”;

private final int mineIcons[] = 
{
    R.drawable.habit,
    R.drawable.story,
    R.drawable.submenu_voice_message,
    R.drawable.study,
    R.drawable.guess,
    R.drawable.poem,
    R.drawable.add
};

private final int mineIconsSelected[] = 
{
    R.drawable.habit_selected,
    R.drawable.story_selected,
    R.drawable.submenu_voice_message_selected,
    R.drawable.study_selected,
    R.drawable.guess_selected,
    R.drawable.poem_selected,
    R.drawable.add
};

private SparseArray<ImageButton> submenuIconArray = new SparseArray<ImageButton>();
private SubMenuListAdapter submenuListAdapter = new SubMenuListAdapter();
private MineListAdapter mineListAdapter = new MineListAdapter();

private GridView gvSubmenu;
private ListView lvMine;

private int selectedItemNumber = 0;

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    View view = inflater.inflate(R.layout.fragment_mine, container, false);
    init(view);

    return view;
}

private void init(View view)
{
    lvMine = (ListView)view.findViewById(R.id.lv_mine);
    lvMine.setAdapter(mineListAdapter);

    gvSubmenu = (GridView)getActivity().findViewById(android.R.id.content).findViewById(R.id.gv_submenu);
    gvSubmenu.setAdapter(submenuListAdapter);
}

public void showSubmenu()
{
    if(gvSubmenu != null)
    {
        gvSubmenu.setVisibility(View.VISIBLE);
    }
}

public void hideSubmenu()
{
    if(gvSubmenu != null)
    {
        gvSubmenu.setVisibility(View.GONE);
    }
}

private class SubMenuListAdapter extends BaseAdapter
{       
    private final int mineIconsDefault[] = 
    {
        R.drawable.habit_selected,
        R.drawable.story,
        R.drawable.submenu_voice_message,
        R.drawable.study,
        R.drawable.guess,
        R.drawable.poem,
        R.drawable.add
    };

    @Override
    public int getCount() 
    {
        return mineIconsDefault.length;
    }

    @Override
    public Object getItem(int position) 
    {
        return mineIconsDefault[position];
    }

    @Override
    public long getItemId(int arg0) 
    {
        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup root) 
    {
        if(convertView == null)
        {
            convertView = LayoutInflater.from(getActivity().getApplicationContext()).inflate(R.layout.list_item_submenu, root, false);
        }

        ImageButton ibSubmenuIcon = (ImageButton)convertView.findViewById(R.id.ib_item_submenu_icon);
        ibSubmenuIcon.setImageResource(mineIconsDefault[position]);
        ibSubmenuIcon.setOnClickListener(new OnClickListener() 
        {   
            @Override
            public void onClick(View arg0) 
            {
                submenuIconArray.get(selectedItemNumber).setImageResource(mineIcons[selectedItemNumber]);
                submenuIconArray.get(position).setImageResource(mineIconsSelected[position]);

                selectedItemNumber = position;
            }
        });

        submenuIconArray.append(position, ibSubmenuIcon);

        return convertView;
    }
}

private class MineListAdapter extends BaseAdapter
{
    //temp 
    private String[] tempListItems = {"item 1", "item 2", "item 3", "item 4", "item 5"};

    @Override
    public int getCount() 
    {
        return tempListItems.length;
    }

    @Override
    public Object getItem(int arg0) 
    {
        return tempListItems[arg0];
    }

    @Override
    public long getItemId(int arg0) 
    {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup root) 
    {
        if(convertView == null)
        {
            convertView = LayoutInflater.from(getActivity().getApplicationContext()).inflate(R.layout.list_item_layout_1, root, false);
        }

        ImageView ivItemIcon = (ImageView)convertView.findViewById(R.id.iv_item_icon);
        TextView tvItemLabel = (TextView)convertView.findViewById(R.id.tv_item_label);

        tvItemLabel.setText(tempListItems[position]);

        return convertView;
    }
}

}

我使用SparseArray来存储GridView加载的每个ImageButton ，以便稍后当我不得不更改ImageButton的图像资源时，我只需要从SparseArray获取该ImageButton ，然后将其图像资源设置为mineIconsSelected的相应图像资源mineIconsSelected整数数组。 在此之前，我将确保将我之前点击的ImageButton的图像资源设置为mineIcons int数组中的对应mineIcons 。

现在，奇怪的问题出现了。

我是能够成功地改变任何的图像资源ImageButton存储在SparseArray后攻， 除了 第一个。 无论我检查代码多少次，创建日志，都找不到问题所在。

请帮我。 非常感谢！

Answer 1

我强烈建议您先简化您的代码。 这样做之后，您的问题将消失或变得更容易调试。 因为您有这么多的按钮，所以前期工作可能有点乏味，但这会使您的代码更易于管理。 为每个按钮创建一个简单的选择器可绘制文件。 即对于习惯按钮：habit_selector.xml（放置在可绘制文件夹中）

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/habit" android:android:state_selected="true"/>
    <item android:drawable="@drawable/habit_selected"/>
</selector>

然后将其设置在您的按钮上：

private final int mineIconSelectors[] = 
{
    R.drawable.habit_selector,
    R.drawable.story_selector,
    R.drawable.submenu_voice_message_selector,
    ...
}

    ...
    ImageButton ibSubmenuIcon = (ImageButton)convertView.findViewById(R.id.ib_item_submenu_icon);
    ibSubmenuIcon.setBackground(mineIconSelectors[position]);

因此，选择按钮后，Android会自动为您切换可绘制资产。