1 public class MainActivity extends ActionBarActivity {
 2     EditText username, password;
 3     SharedPreferences pre;
 4     CheckBox checkBox;
 5     Editor editor;
 6
 7     @Override
 8     protected void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.fragment_main);
11         // SharedPreferences pref =
12         // PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
13
14         /*--------------------------
15         SharedPreferences pref = getSharedPreferences("myPref", MODE_PRIVATE);
16         Editor editor = pref.edit();
17         editor.putString("name", "zy");
18         editor.putInt("age", 22);
19         editor.putLong("time", System.currentTimeMillis());
20         editor.putBoolean("default", true);
21
22         editor.commit();
23         editor.remove("default");
24         editor.commit();
25         System.out.println(pref.getString("name", "xx"));
26         System.out.println(pref.getInt("age", 0));
27          */
28
29         // ----------------实例-------------
30         username = (EditText) findViewById(R.id.username);
31         password = (EditText) findViewById(R.id.password);
32         checkBox = (CheckBox) findViewById(R.id.savename);
33         pre = getSharedPreferences("userinfo", MODE_PRIVATE);
34         editor = pre.edit();
35         String name = pre.getString("username", "");
36         if (name == null || name.equals("")) {
37             checkBox.setChecked(false);
38         } else {
39             checkBox.setChecked(true);
40             username.setText(name);
41         }
42
43     }
44
45     public void doClick(View view) {
46         switch (view.getId()) {
47         case R.id.login:
48             String name = username.getText().toString().trim();
49             String pass = password.getText().toString().trim();
50             if ("zy".equals(name) && "123456".equals(pass)) {
51                 if (checkBox.isChecked()) {
52                     editor.putString("username", name);
53                     editor.commit();
54
55                 } else {
56                     editor.remove("username");
57                     editor.commit();
58                 }
59                 Toast.makeText(MainActivity.this, "成功了", 0).show();
60             } else {
61                 Toast.makeText(MainActivity.this, "失败咯", 0).show();
62             }
63
64             break;
65
66         case R.id.cancel:
67             break;
68         }
69     }
70 }