简单Spinner

  1 package com.zzw.spinner;
  2 
  3 import android.app.Activity;
  4 import android.content.Context;
  5 import android.os.Bundle;
  6 import android.view.LayoutInflater;
  7 import android.view.View;
  8 import android.view.ViewGroup;
  9 import android.widget.AdapterView;
 10 import android.widget.AdapterView.OnItemSelectedListener;
 11 import android.widget.ArrayAdapter;
 12 import android.widget.Spinner;
 13 import android.widget.TextView;
 14 import android.widget.Toast;
 15 
 16 public class MainActivity extends Activity {
 17 
 18     private String[] start_citys, end_citys;
 19 
 20     @Override
 21     protected void onCreate(Bundle savedInstanceState) {
 22         super.onCreate(savedInstanceState);
 23         setContentView(R.layout.activity_main);
 24 
 25         start_citys = getResources().getStringArray(R.array.start_city);
 26         end_citys = getResources().getStringArray(R.array.end_city);
 27 
 28         Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
 29         spinner1.setAdapter(new MySpinnerAdapter(this, R.layout.item_start, R.id.TextView_start, start_citys));
 30         Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);
 31         spinner2.setAdapter(new MySpinnerAdapter(this, R.layout.item_end, R.id.TextView_end, end_citys));
 32 
 33         spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {
 34             @Override
 35             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
 36                 Toast.makeText(getApplicationContext(), start_citys[position], 0).show();
 37             }
 38 
 39             @Override
 40             public void onNothingSelected(AdapterView<?> parent) {
 41 
 42             }
 43         });
 44 
 45         spinner2.setOnItemSelectedListener(new OnItemSelectedListener() {
 46 
 47             @Override
 48             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
 49                 Toast.makeText(getApplicationContext(), end_citys[position], 0).show();
 50             }
 51 
 52             @Override
 53             public void onNothingSelected(AdapterView<?> parent) {
 54 
 55             }
 56         });
 57 
 58     }
 59 
 60     private class MySpinnerAdapter extends ArrayAdapter {
 61         private Context context;
 62         private int item;
 63         private int R_textView;
 64         private String[] citys;
 65         LayoutInflater inflater;
 66 
 67         public MySpinnerAdapter(Context context, int resource, int textViewResourceId, String[] citys) {
 68             super(context, resource, textViewResourceId, citys);
 69             this.context = context;
 70             this.item = resource;
 71             this.R_textView = textViewResourceId;
 72             this.citys = citys;
 73             inflater = LayoutInflater.from(context);
 74         }
 75 
 76         @Override
 77         public int getCount() {
 78             return citys.length;
 79         }
 80 
 81         // 下拉框中显示的view
 82         @Override
 83         public View getView(int position, View convertView, ViewGroup parent) {
 84             if (convertView == null) {
 85                 convertView = inflater.inflate(item, null);
 86             }
 87             TextView textView = (TextView) convertView.findViewById(R_textView);
 88             textView.setText(citys[position]);
 89             return convertView;
 90         }
 91 
 92         // 显示的是下拉的列表view
 93         // 如果数据没有从new的时候传递下来，那么不写这个方法有Resources$NotFoundException异常
 94         @Override
 95         public View getDropDownView(int position, View convertView, ViewGroup parent) {
 96             if (convertView == null) {
 97                 convertView = inflater.inflate(item, null);
 98             }
 99             TextView textView = (TextView) convertView.findViewById(R_textView);
100             textView.setText(citys[position]);
101             return convertView;
102         }
103 
104     }
105 }