android - 为列表视图中的每个元素设置不同的分隔线颜色

Question

我想要一个列表元素之间有不同分隔符的列表。我用这段代码定义了一个高度为 1 的白色分隔线：

_listView.setDivider(new ColorDrawable(Color.WHITE));
_listView.setDividerHeight(1);

然而，它将所有元素的分隔线设置为白色，我只希望其中一些是白色的，另一个是不同的颜色。

我怎样才能做到这一点？

Answer 1

将分隔线的高度设置为 0，并在项目布局中实现一个高度为 1 的视图，并在每次构建视图时根据列表项更改其颜色。

这是一个 XML 布局示例：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView 
        android:id="@+id/text"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

    <View 
        android:id="@+id/divider"
    android:layout_width="fill_parent"
    android:layout_height="1dp"
    android:background="#FFFFFFFF" />

</LinearLayout>

这就是您如何更改适配器中的颜色：

public class MyAdapter extends BaseAdapter {
    /** List of items to show */
    private ArrayList<String> items = new ArrayList<String>();
    private Context context;
    private int color[];

    public OffersAdapter(Context c, ArrayList<String> items, int color[])
    {
        super();
        this.context = c;
        this.items = items;
        this.color = color;
    }

    public int getCount() {
        return items.size();
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder viewHolder;

    if(null == convertView)
    {
        LayoutInflater inflater = LayoutInflater.from(context);
        convertView = inflater.inflate(R.layout.list_item, parent, false);

        viewHolder.text = (TextView) convertView.findViewById(R.id.text);
        viewHolder.divider = (View) convertView.findViewById(R.id.divider);

        convertView.setTag(viewHolder);
    } else {
        //Retrieve the current view
        viewHolder = (ViewHolder) convertView.getTag(); 
    }

    //This is where you chance the divider color based on the item  
    viewHolder.divider.setBackgroundColor(color[position]);

  viewHolder.text.setText(items.get(position));

    return convertView;
}

//Holds the current view
 private static class ViewHolder {
         public TextView text;
         public View divider;
     }   
}

int color[]您要使用的颜色列表在哪里。

阅读此处了解有关 ViewHolder 的更多信息。

Answer 2

1. 在 xml 中分隔您的列表项和整个列表
2. 为您的列表项创建一个自定义适配器并实例化您的列表
3. 根据您想要更改从适配器添加到列表的每个新项目的分隔线颜色的标准

例子：

列表项.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView 
        android:id="@+id/sometext"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

    <View 
        android:id="@+id/customdivider"
    android:layout_width="fill_parent"
    android:layout_height="1dp"
          />

</LinearLayout>

列表.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
   >

    <ListView
        android:id="@+id/totallynewlist"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
       />

</LinearLayout>

CustomAdapter.java

public class CustomAdapter extends BaseAdapter {

    private Activity activity;
    private ArrayList<HashMap<String, String>> data;
    private static LayoutInflater inflater = null;

    public SubjectListAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
        activity = a;
        data = d;
        inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }

    public int getCount() {
        return data.size();
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }



        public View getView(int position, View convertView, ViewGroup parent) {
            View vi = convertView;
            if (convertView == null)
                vi = inflater.inflate(R.layout.listitem, null);

        //Find the divider here and depending on your criteria change the colour - if required take data from main activity if you need it to change the colour 
       View divider= (View) vi.findViewById(R.id.customdivider); 
       if(your criteria)
          divider.setBackgroundColor(R.color.white); //assuming white is defined in              colors
       else
         set to whatever color
        return vi;
        }
}

在您的活动中

    ListView list = (ListView) findViewById(R.id.totallynewlist);

    // creating new HashMap
    HashMap<String, String> map = new HashMap<String, String>();
    <//Pass whatever condition you want for your criteria here if you need to - optional>
    ListPass.add(map);

    adapter = new CustomAdapter(this, ListPass);

    list.setAdapter(adapter);