Android使用popueWindow自定义Spinner

其实就是很简单的控件自定义，只不过这两天项目用到，还是到处搜改了下，现简单记录。方便有需要的时候修改为自己使用：

需求

一个TextView或者Button点击的时候要弹出一些下拉选择框，可能TextView/Button还要变色或者图标变化：

实现思路

点击Textview的时候弹出一个popupWindow（后文简写），popWind布局是一个RelativeLayout或者LinearLayout，里面一个ListView/Recyclerview，它的item自己根据需要定义。

简单代码

1，MainActivity.java 程序入口，初始化数据，初始化自定义popWind，TextView点击之后显示popWind，处理ListView的点击事件：

/** 
 * 主Activity  用来实现popupwindow 
 * @author ansen 
 */  
public class MainActivity extends Activity {  
    private SpinerPopWindow<String> mSpinerPopWindow;  
    private List<String> list;  
    private TextView tvValue;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
  
        initData();  
  
        tvValue = (TextView) findViewById(R.id.tv_value);  
        tvValue.setOnClickListener(clickListener);  
        mSpinerPopWindow = new SpinerPopWindow<String>(this, list);
        mSpinerPopWindow.setOnItemListener(dismissListener);
        mSpinerPopWindow.setOnDismissListener(dismissListener);  
    }  
      
    /** 
     * 监听popupwindow取消 
     */  
    private OnDismissListener  dismissListener=new OnDismissListener() {  
        @Override  
        public void onDismiss() {  
            setTextImage(R.drawable.icon_down);  
        }  
    };  
  
    /** 
     * popupwindow显示的ListView的item点击事件 
     */  
    private OnItemClickListener itemClickListener = new OnItemClickListener() {  
        @Override  
        public void onItemClick(AdapterView<?> parent, View view, int position,long id) {  
            mSpinerPopWindow.dismiss();  
            tvValue.setText(list.get(position));  
            Toast.makeText(MainActivity.this, "点击了:" + list.get(position),Toast.LENGTH_LONG).show();  
        }  
    };  
  
    /** 
     * 显示PopupWindow 
     */  
    private OnClickListener clickListener = new OnClickListener() {  
        @Override  
        public void onClick(View v) {  
            switch (v.getId()) {  
            case R.id.tv_value:  
                mSpinerPopWindow.setWidth(tvValue.getWidth());  
                mSpinerPopWindow.showAsDropDown(tvValue);  
                setTextImage(R.drawable.icon_up);  
                break;  
            }  
        }  
    };  
  
    /** 
     * 初始化数据 
     */  
    private void initData() {  
        list = new ArrayList<String>();  
        for (int i = 0; i < 5; i++) {  
            list.add("test:" + i);  
        }  
    }  
  
    /** 
     * 给TextView右边设置图片 
     * @param resId 
     */  
    private void setTextImage(int resId) {  
        Drawable drawable = getResources().getDrawable(resId);  
        drawable.setBounds(0, 0, drawable.getMinimumWidth(),drawable.getMinimumHeight());// 必须设置图片大小，否则不显示  
        tvValue.setCompoundDrawables(null, null, drawable, null);  
    }  
}

2，activity_main.xml  这个文件也没啥好说的，就是两个TextView：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:orientation="vertical" >  
    <LinearLayout  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:layout_margin="5dp"  
        android:orientation="horizontal">  
  
        <TextView  
            android:id="@+id/tv_value"  
            android:layout_width="0dp"  
            android:layout_height="wrap_content"  
            android:layout_weight="1"  
            android:background="@drawable/shape_help_category_tv_bg"  
            android:drawableRight="@drawable/icon_down"  
            android:padding="10dp"  
            android:textColor="@color/content_color"  
            android:text="请选择父类别"  
            android:textSize="20sp"/>  
  
        <TextView  
            android:layout_marginLeft="5dp"  
            android:layout_width="0dp"  
            android:layout_height="wrap_content"  
            android:layout_weight="1"  
            android:background="@drawable/shape_help_category_tv_bg"  
            android:drawableRight="@drawable/icon_down"  
            android:textColor="@color/content_color"  
            android:padding="10dp"  
            android:text="请选择子类别"  
            android:textSize="20sp" />  
    </LinearLayout>  
</LinearLayout>

3，SpinerPopWindow.java 自定义Popupwindow类，初始化popWind显示的布局，以及一些参数，并且给listView设置适配器：

* 自定义PopupWindow  主要用来显示ListView  
 * @author Jason
 * @create time 2022-3  
 */  
public class SpinerPopWindow<T> extends PopupWindow {  
    private LayoutInflater inflater;  
    private ListView mListView;  
    private List<T> list;  
    private MyAdapter  mAdapter;  
      
    public SpinerPopWindow(Context context,List<T> list) {  
        super(context);  
        inflater=LayoutInflater.from(context);  
        this.list=list;  
        View view = inflater.inflate(R.layout.spiner_window_layout, null);  
        setContentView(view);
        //大小怎么设置，或者不设置，根据自己需要         
        setWidth(LayoutParams.WRAP_CONTENT);  
        setHeight(LayoutParams.WRAP_CONTENT);  
        setFocusable(true);  
        ColorDrawable dw = new ColorDrawable(0x00);  
        setBackgroundDrawable(dw);  
        mListView = (ListView) view.findViewById(R.id.listview);
        mAdapter=new MyAdapter()
        mListView.setAdapter(mAdapter);  
    }  
      
    private void SetOnItemListener(OnItemClickListener clickListener){  
        if(mListView != null){
            mListView.setOnItemClickListener(clickListener);  
        }
    }  
      
    private class MyAdapter extends BaseAdapter{  
        @Override  
        public int getCount() {  
            return list.size();  
        }  
  
        @Override  
        public Object getItem(int position) {  
            return list.get(position);  
        }  
  
        @Override  
        public long getItemId(int position) {  
            return position;  
        }  
  
        @Override  
        public View getView(int position, View convertView, ViewGroup parent) {  
            ViewHolder holder=null;  
            if(convertView==null){  
                holder=new ViewHolder();
                // 这个spiner_item_layout就是根据自己需要定义，比如仅一个textview
                convertView=inflater.inflate(R.layout.spiner_item_layout, null);  
                holder.tvName=(TextView) convertView.findViewById(R.id.tv_name);  
                convertView.setTag(holder);  
            }else{  
                holder=(ViewHolder) convertView.getTag();  
            }  
            holder.tvName.setText(getItem(position).toString());  
            return convertView;  
        }  
    }  
      
    private class ViewHolder{  
        private TextView tvName;  
    }  
}

4，spiner_window_layout.xml，popWind显示的布局文件，里面就一个ListView控件：

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="match_parent"  
    android:layout_height="wrap_content"  
    android:layout_alignParentRight="true"  
    android:orientation="vertical">  
  
    <ListView  
        android:id="@+id/listview"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"   
        android:background="@drawable/shape_popupwindow_list_bg"  
        android:scrollbars="none" >  
    </ListView>  
</LinearLayout>

各部分代码根据自身需要修改，比如listView-item，或者点击事件等。