Dialog列表以及实现记住选择

 1 public class MainActivity extends Activity {
 2     private TextView tv1;
 3     private TextView tv2;
 4     private TextView tv3;
 5     
 6     @Override
 7     protected void onCreate(Bundle savedInstanceState) {
 8         super.onCreate(savedInstanceState);
 9         setContentView(R.layout.activity_main);
10         tv1 = (TextView)findViewById(R.id.tv1);
11         tv2 = (TextView)findViewById(R.id.tv2);
12         tv3 = (TextView)findViewById(R.id.tv3);
13         DiaologOnItemClickListener Listener = new DiaologOnItemClickListener();
14         tv1.setOnClickListener(Listener);
15         tv2.setOnClickListener(Listener);
16     }
17     private class DiaologOnItemClickListener implements OnClickListener{
18         private int weizhi;//weizhi代表着上次被选中的位置，打开应用后先去SharedPreferences里面取值，如果没有就以0为默认值，看25行
19         private SharedPreferences pref;
20         private SharedPreferences.Editor editor;
21         @Override
22         public void onClick(View v) {
23             // TODO Auto-generated method stub
24             pref = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);//24和25行不能写在onCreate方法里面，只能写在点击事件里面，因为
25             weizhi = pref.getInt("weizhi",0);//...每生成一次点击事件，程序就会去SharedPreferences取值，以此来达到记住的效果
26             switch(v.getId()){
27             case R.id.tv1:
28                 final String[] lang1 = {"南京","上海","北京"};
29                 new AlertDialog.Builder(MainActivity.this).setTitle("城市列表选择:").setSingleChoiceItems(lang1,weizhi,new
30                         DialogInterface.OnClickListener() {
31                             @Override
32                             public void onClick(DialogInterface dialog,
33                                     int which) {
34                                 // TODO Auto-generated method stub
35                                 //dialog.dismiss();
36                                 editor = pref.edit();
37                                 editor.putInt("weizhi", which);
38                                 editor.commit();
39                                 tv3.setText("您选择的城市是:"+lang1[which]);
40                             }
41                 }).setPositiveButton("确定", new DialogInterface.OnClickListener(){
42                         @Override
43                         public void onClick(DialogInterface dialog, int which) {
44                             // TODO Auto-generated method stub
45                         
46                         }
47                 }).show();
48                 break;
49             case R.id.tv2:
50                 String[] lang2 = {"浦东新区","闵行区","南汇区"};
51                 new AlertDialog.Builder(MainActivity.this).setTitle("城市列表选择:").setSingleChoiceItems(lang2,0,new
52                         DialogInterface.OnClickListener() {
53                             @Override
54                             public void onClick(DialogInterface dialog,
55                                     int which) {
56                                 // TODO Auto-generated method stub
57                                 dialog.dismiss();
58                             }
59                 }).setPositiveButton("确定", new DialogInterface.OnClickListener(){
60                         @Override
61                         public void onClick(DialogInterface dialog, int which) {
62                             // TODO Auto-generated method stub
63                                 
64                         }
65                 }).show();
66                 break;
67             default:
68                 break;
69             }
70         }
71     }
72 }