Spinner实现下拉框

image.png

image.png

页面设置

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="25dp"
    android:textColor="#f50202"/>
<Spinner
    android:id="@+id/spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"></Spinner>

java代码

在这个功能实现部分采用俩种效果
第一种是简单的地方选择，只有文字的显示下拉框，采用的适配器是ArrayAdapter
第二种是有图片文字的下拉框选择，采用的适配器是SimpleAdapter ，相对比较难一点
以下就是实现俩种效果的java功能代码

 private TextView textView;
    private Spinner spinner;
    private List<String> list;
    private  ArrayAdapter<String> arrayAdapter;
    private SimpleAdapter simpleAdapter;
    private List<Map<String,Object>>dataList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner);
        textView=(TextView) findViewById(R.id.textView);
        textView.setHint("您選擇的是:");
        spinner=(Spinner) findViewById(R.id.spinner);
        //設置數據源
//        list= new ArrayList<String>();
//        list.add("北京");
//        list.add("上號");
//        list.add("內蒙古");
//        list.add("深圳");
//         arrayAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list);
//        arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//        spinner.setAdapter(arrayAdapter);
//        spinner.setOnItemSelectedListener(this);
        dataList=new ArrayList<Map<String,Object>>();
        simpleAdapter=new SimpleAdapter(this,this.getData(),R.layout.item,new String[]{"image","text"},new int[]{R.id.image,R.id.text});
        simpleAdapter.setDropDownViewResource(R.layout.item);
        spinner.setAdapter(simpleAdapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
             textView.setText("您选择的是"+simpleAdapter.getItem(position));
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
               textView.setText("NONE");
            }
        });

    }
//    @Override
//    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//         String cityName = simpleAdapter.getItem(position);
//        textView.setText("您選擇的是："+cityName);
//    }
//
//    @Override
//    public void onNothingSelected(AdapterView<?> parent) {
//
//    }
    private  List<Map<String,Object>> getData(){
       Map<String,Object> map=new HashMap<String,Object>();
        map.put("image",R.drawable.ic_cardid);
        map.put("text","北京");
        dataList.add(map);
        Map<String,Object> map1=new HashMap<String,Object>();
        map1.put("image",R.drawable.ic_cardid);
        map1.put("text","內蒙古");
        dataList.add(map1);
        Map<String,Object> map2=new HashMap<String,Object>();
        map2.put("image",R.drawable.ic_cardid);
        map2.put("text","天津");
        dataList.add(map2);
        Map<String,Object> map3=new HashMap<String,Object>();
        map3.put("image",R.drawable.ic_cardid);
        map3.put("text","上海");
        dataList.add(map3);
        return dataList;
    }

实现的最终效果是这样的：

image.png

第二种效果图

image.png