android - NavigationDrawer，带有图像的适配器

Question

我有一个带有此代码的抽屉导航:

mDrawerListView.setAdapter(new ArrayAdapter<String>(
            getActionBar().getThemedContext(),
            R.layout.item_menu,
            R.id.item1,
            new String[]{
                    getString(R.string.title_section1),
                    getString(R.string.title_section2),
                    getString(R.string.title_section3),
                    getString(R.string.title_section4),
                    getString(R.string.title_section5),
                    getString(R.string.title_section6),
            }));

我需要为每个项目添加一个图像，而不仅仅是一个字符串。 我已经有了我的项目 xml (R.layout.item_menu):

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="horizontal"
android:weightSum="1"
android:layout_height="wrap_content">
<ImageView
    android:layout_width="0dp"
    android:layout_weight="0.2"
    android:layout_height="wrap_content"
    android:adjustViewBounds="true"
    android:id="@+id/image1"
    android:layout_centerVertical="true" />
<TextView
    android:id="@+id/item1"
    android:layout_width="0dp"
    android:layout_weight="0.8"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceListItemSmall"
    android:gravity="center_vertical"
    android:padding="5dp"
    android:layout_toRightOf="@+id/image1"
    android:background="?android:attr/activatedBackgroundIndicator"
    android:minHeight="?android:attr/listPreferredItemHeightSmall" />
</LinearLayout>

但我不知道如何传递图像。 有帮助吗？谢谢

Answer 1

你应该像下面的代码一样为你的图像Arraylist创建Custom Adapter，你的Custom Adapter像这样创建

 public class YourAdapter extends ArrayAdapter<NavDrawerItem>
    {
        private final Context context;
        private final int layoutResourceId;
        private NavDrawerItem data[] = null;
        public NavDrawerAdapter(Context context, int layoutResourceId, NavDrawerItem [] data)
       {
        super(context, layoutResourceId, data);
        this.context = context;
        this.layoutResourceId = layoutResourceId;
        this.data = data;
       }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        View v = inflater.inflate(layoutResourceId, parent, false);
        ImageView imageView =(ImageView)v.findViewById(R.id.navDrawerImageView);
        TextView textView = (TextView) v.findViewById(R.id.navDrawerTextView);
        NavDrawerItem choice = data[position];
        imageView.setImageResource(choice.icon);
        textView.setText(choice.name);
        return v;
    }
}

对于 NavDrawerItem:

public class NavDrawerItem
{
    public int icon;
    public String name;

    public NavDrawerItem(int icon, String name)
    {
        this.icon = icon;
        this.name = name;
    }
}

对于 drawer_list_item.xml:

        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:background="?android:attr/activatedBackgroundIndicator"
        android:minHeight="?android:attr/listPreferredItemHeightSmall"
        android:padding ="10dp">

        <ImageView
            android:id="@+id/navDrawerImageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:paddingRight="10dp"/>

        <TextView
           android:id="@+id/navDrawerTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_toRightOf="@+id/navDrawerImageView"
            android:paddingRight="10dp"
            android:textAppearance="?android:attr/textAppearanceListItemSmall"/>
    </RelativeLayout>

在 MainActivity.java 中，实例化一个 NavDrawerItem 对象数组，每个对象都有适当的 drawable 和名称，然后在设置适配器时传递这个数组，比如所以: mDrawerList.setAdapter(new YourAdapter(this, R.layout.drawer_list_item, yourArray));