[移动开发]Android 自定义Spinner

下拉控件再常见不过了,今天做一个类别的下拉菜单用到了自定义Spinner控件,再次记录一下,

首先是布局:

 <Spinner
                android:id="@+id/blog_spinner"
                android:layout_width="wrap_content"
                android:overlapAnchor="false"
                android:spinnerMode="dropdown"
                android:layout_height="wrap_content"
                android:background="@null" />

代码部分,因为点击的时候要用到id就自己组装了下数据源给个大概吧实体类:与数据源遍历:

List<BlogClassBean> classBeanList =new ArrayList();

                                List<BlogClassBean> classData = new ArrayList<BlogClassBean>();
                                for (BlogTypeBean.ListBean listBean : response.getData().getList()) {
                                    if (TextUtils.equals(listBean.getType(), "Class")) {
                                        classData.add(new BlogClassBean(
                                                listBean.getSort(),
                                                listBean.getTypeName(),
                                                listBean.getId(),
                                                listBean.getType()
                                        ));
                                    }
                                }
                                classBeanList.setValue(classData);
                                LogUtils.e("m_tag_blog_class", "新版组装classBeanList类别数据源:" + GsonUtil.obj2Json(classData));

public class BlogClassBean {

    public BlogClassBean(String sort, String typeName, int id, String type) {
        this.sort = sort;
        this.typeName = typeName;
        this.id = id;
        this.type = type;
    }

    /**
     * sort : 1
     * typeName : FASHION
     * id : 19.0
     * type : Class
     */



    private String sort;
    private String typeName;
    private int id;
    private String type;

    public String getSort() {
        return sort;
    }

    public void setSort(String sort) {
        this.sort = sort;
    }

    public String getTypeName() {
        return typeName;
    }

    public void setTypeName(String typeName) {
        this.typeName = typeName;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }


}

              //  建立Adapter绑定数据源
               SpinnerAdapter spinnerAdapter = new SpinnerAdapter(getActivity(), new ArrayList<>());
                //绑定Adapter
                binding.blogSpinner.setAdapter(spinnerAdapter);
                binding.blogSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                    LogUtils.e("m_tag_blog_class", "选择类别为:" ++spinnerAdapter.getItem(position));
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parent) {

                    }
                });

自定义适配器:

public class SpinnerAdapter extends BaseAdapter {
    private List<BlogClassBean> mList;
    private Context mContext;

    public SpinnerAdapter(Context pContext, List<BlogClassBean> pList) {
        this.mContext = pContext;
        this.mList = pList;
    }

    @Override
    public int getCount() {
        return mList.size();
    }

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

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

    /**
     * 下面是重要代码
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        convertView = layoutInflater.inflate(R.layout.spinner_layout, null);
        if (convertView != null) {
            TextView textView = (TextView) convertView.findViewById(R.id.tv_spinner);
            textView.setText(mList.get(position).getTypeName());
        }
        return convertView;
    }
}

spinner item布局就一个textview

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/tv_spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:gravity="center"
    android:padding="8dp"
    android:textSize="@dimen/textsize_12sp"
    tools:text="video" />