Spinner的使用(一项内容)

spinner_item1.xml

<?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="match_parent"
    android:orientation="horizontal">
    <TextView
        android:id="@+id/txt_name"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_marginLeft="10dp"
        android:gravity="center_vertical"
        android:textSize="16sp" />
</LinearLayout>

AdapterSpinner1.java

public class AdapterSpinner1 extends BaseAdapter {

    private Context mContext;
    private List<String> mList;

    public AdapterSpinner1(Context pContext, List<String> 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;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        convertView = inflater.inflate(R.layout.spinner_item1, null);
        if(convertView != null)
        {
            TextView txt_name = (TextView)convertView.findViewById(R.id.txt_name);
            txt_name.setText(mList.get(position));
        }
        return convertView;
    }
}

Activity中：

１. 定义变量

    private Spinner mSpinnerZT;
    private ArrayList<String> listZT;
    private AdapterSpinner1 adpapter_ZT;

2. 变量的初始化

mSpinnerZT = (Spinner) findViewById(R.id.spinner_zt);

listZT = new ArrayList<String>();
adpapter_ZT = new AdapterSpinner1(this, listZT);
mSpinnerZT.setAdapter(adpapter_ZT);

3. 内容的动态改变

listZT.clear();
 for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject jsonData = jsonArray.getJSONObject(i);
    listZT.add(jsonData.getString("NAME"));
}
adpapter_ZT.notifyDataSetChanged();

４. 取当前的选项

final String sZT = listZT.get(mSpinnerZT.getSelectedItemPosition());