Android UI自定义Spinner下拉框（用popuwindow实现）-转

定义出第一个图片的布局和弹出框（一个listView）的布局，，这里就不在多说了~ListView需要自己定义一个MyspinnerAdapter~做好这些准备之后，就是弹出框的实现了~

 protected void onCreate(Bundle savedInstanceState) {

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        super.onCreate(savedInstanceState);

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        setContentView(R.layout.activity_main);

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        textView = (TextView) findViewById(R.id.text);

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        imgView = findViewById(R.id.arrowbut);

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        // 实例化一个List,添加数据

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        list = new ArrayList<String>();

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        list.add("第一展厅");

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        list.add("第二展厅");

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        list.add("第三展厅");

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        // 实例化一个适配器，list的数据作为Adapter的数据

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        adapter = new MyspinnerAdapter(this, list);

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        // 默认设置下拉框的标题为数据的第一个

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        textView.setText((CharSequence) adapter.getItem(0));

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        spinnerlayout = (LinearLayout) findViewById(R.id.spinnerid);

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        // 点击右侧按钮，弹出下拉框

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        imgView.setOnClickListener(new OnClickListener() {

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            @Override

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            public void onClick(View v) {

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                showWindow(v);

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            }

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        });

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    }

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    @SuppressWarnings("deprecation")

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    public void showWindow(View v) {

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        // 找到布局文件

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        layout = (LinearLayout) LayoutInflater.from(this).inflate(R.layout.mypinner_dropdown, null);

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        // 实例化listView

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        listView = (ListView) layout.findViewById(R.id.listView);

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        // 设置listView的适配器

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        listView.setAdapter(adapter);

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        // 实例化一个PopuWindow对象

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        popupWindow = new PopupWindow(v);

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        // 设置弹框的宽度为布局文件的宽

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        popupWindow.setWidth(spinnerlayout.getWidth());

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        // 高度随着内容变化

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        popupWindow.setHeight(LayoutParams.WRAP_CONTENT);

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        // 设置一个透明的背景，不然无法实现点击弹框外，弹框消失

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        popupWindow.setBackgroundDrawable(new BitmapDrawable());

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        // 设置点击弹框外部，弹框消失

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        popupWindow.setOutsideTouchable(true);

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        // 设置焦点

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        popupWindow.setFocusable(true);

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        // 设置所在布局

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        popupWindow.setContentView(layout);

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        // 设置弹框出现的位置，在v的正下方横轴偏移textview的宽度，为了对齐~纵轴不偏移

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        popupWindow.showAsDropDown(v, -textView.getWidth(), 0);

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        // listView的item点击事件

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        listView.setOnItemClickListener(new OnItemClickListener() {

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            @Override

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            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

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                // TODO Auto-generated method stub

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                textView.setText(list.get(arg2));// 设置所选的item作为下拉框的标题

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                // 弹框消失

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                popupWindow.dismiss();

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                popupWindow = null;

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            }

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        });

spinner用法：
 this.bank_name = (Spinner) super.findViewById(R.id.spinnerCityStatic);
 this.bank_name.setOnItemSelectedListener(new OnItemSelectedListenerImpl());
 // 下拉框选择事件
	private class OnItemSelectedListenerImpl implements OnItemSelectedListener {
		@Override
		public void onItemSelected(AdapterView<?> parent, View view,
				int position, long id) {
			String city = parent.getItemAtPosition(position).toString();
			Toast.makeText(BangBankActivity.this, "选择的城市是：" + city,
					Toast.LENGTH_LONG).show();
		}
		@Override
		public void onNothingSelected(AdapterView<?> parent) {
			// TODO Auto-generated method stub
		}
	}