SharedPreferences保存用书登录信息

UI界面：

代码：

 1 package activity.cyq.helloandroidstudio;
 2
 3 import android.content.Intent;
 4 import android.content.SharedPreferences;
 5 import android.support.v7.app.AppCompatActivity;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.CheckBox;
 9 import android.widget.EditText;
10
11
12 public class SharePreferenceLearn extends AppCompatActivity {
13     private EditText username;
14     private EditText password;
15     private CheckBox remenberData;
16     SharedPreferences preferences;
17
18
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_share_preference_learn);
23
24         preferences = getPreferences(MODE_PRIVATE);
25         final SharedPreferences.Editor editor = preferences.edit();
26         username = (EditText) findViewById(R.id.username);
27         password = (EditText) findViewById(R.id.password);
28         remenberData = (CheckBox) findViewById(R.id.remenberCheck);
29
30         username.setText(preferences.getString("username", null));
31         password.setText(preferences.getString("password", null));
32
33         findViewById(R.id.loginBtn).setOnClickListener(new View.OnClickListener() {
34             @Override
35             public void onClick(View v) {
36                 if (remenberData.isChecked()) {
37                     editor.putString("username", username.getText().toString());
38                     editor.putString("password", password.getText().toString());
39                     /*提交数据*/
40                     editor.commit();
41                     startActivity(new Intent(SharePreferenceLearn.this, MainActivity.class));
42                 }
43                 startActivity(new Intent(SharePreferenceLearn.this, MainActivity.class));
44             }
45         });
46     }
47 }