我有一个使用 ArrayAdapter
的工作抽屉导航,如 documentation 中所示.我想为每个抽屉导航项目设置 ImageView
图标,所以我需要创建一个自定义适配器来使用,但我不确定该怎么做。我在下面运行时没有使应用程序崩溃,但是抽屉导航打开时是空的,里面什么也没有。你能帮帮我吗?提前致谢!
到目前为止,我为自定义适配器所做的工作:
public class CustomAdapter extends ArrayAdapter
{
private final Context context;
public CustomAdapter(Context context)
{
super(context, R.layout.drawer_list_item);
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.drawer_list_item, parent, false);
TextView textViewHome = (TextView) v.findViewById(R.id.drawerHomeTextView);
ImageView imageViewHome = (ImageView) v.findViewById(R.id.drawerHomeImage);
TextView textViewList = (TextView) v.findViewById(R.id.drawerListTextView);
ImageView imageViewList = (ImageView) v.findViewById(R.id.drawerListImage);
return v;
}
}
在 MainActivity
中设置抽屉:
mDrawerList = (ListView) findViewById(R.id.leftDrawer);
mDrawerList.setAdapter(new CustomAdapter(this));
使用的ListView
:
<ListView android:id="@+id/leftDrawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#111"/>
drawer_list_item.xml
:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="match_parent">
<RelativeLayout
android:id="@+id/drawerRelativeLayoutHome"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/drawerHomeImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:paddingStart="4dp"
android:paddingEnd="4dp"
android:paddingLeft="4dp"
android:src="@drawable/ic_menu_home"/>
<TextView
android:id="@+id/drawerHomeTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/drawerHomeImage"
android:layout_toEndOf="@+id/drawerHomeImage"
android:background="@drawable/background_activated"
android:paddingLeft="4dp"
android:paddingRight="4dp"
android:paddingTop="12dp"
android:paddingBottom="12dp"
android:text="Home"
android:textSize="20sp"/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/drawerRelativeLayoutList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/drawerRelativeLayoutHome">
<!-- same as above, but ic_menu_archive as drawable, and "List" as text -->
</RelativeLayout>
</RelativeLayout>
最佳答案
对于您的自定义适配器:
public class NavDrawerAdapter 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,然后传递这个数组当你设置适配器时,像这样:
mDrawerList.setAdapter(new YourAdapter(this, R.layout.drawer_list_item, yourArray));
关于android - 抽屉导航的自定义适配器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27082763/