使用SharedPreferences存储用户配置信息
用SharedPreferences来保存用户的基本配置信息非常的方便，实现起来也很容易；以下是一个简单的例子：
效果截图：
主要代码：
1 public class MainActivity
2 extends AppCompatActivity
3 implements View.OnClickListener {
4 private EditText mEtName;
5 private EditText mEtPassword;
6 private CheckBox mCbMark;
7 private Button mBtnOk;
8 private final String KEY_NAME = "name";
9 private final String KEY_PASSWORD = "password";
10 private final String KEY_MARK = "mark";
11
12 @Override
13 protected void onCreate(Bundle savedInstanceState) {
14 super.onCreate(savedInstanceState);
15 setContentView(R.layout.activity_main);
16
17 initViews();
18 }
19
20
21 @Override
22 public void onClick(View v) {
23 String name = mEtName.getText().toString().trim();
24 String password = mEtPassword.getText().toString().trim();
25 if ("".equalsIgnoreCase(name) || "".equalsIgnoreCase(password)) {
26 Toast.makeText(this, "账号和密码不能为空！", Toast.LENGTH_LONG).show();
27 }
28 else {
29 SharedPreferences userInfo = getSharedPreferences("user_info", MODE_PRIVATE);
30 SharedPreferences.Editor editor = userInfo.edit();
31 editor.putString(KEY_NAME, name);
32 editor.putBoolean(KEY_MARK, mCbMark.isChecked());
33 if (mCbMark.isChecked()) {
34 editor.putString(KEY_PASSWORD, password);
35 }
36 else {
37 editor.putString(KEY_PASSWORD, "");
38 }
39 editor.apply();//---应用操作
40
41 Toast.makeText(this, "用户信息保存成功！", Toast.LENGTH_LONG).show();
42 }
43 }
44
45 private void initViews() {
46 SharedPreferences userInfo = getSharedPreferences("user_info", MODE_PRIVATE);
47
48 mEtName = (EditText)findViewById(R.id.etName);
49 mEtPassword = (EditText)findViewById(R.id.etPassword);
50 mCbMark = (CheckBox)findViewById(R.id.cbMark);
51 mBtnOk = (Button)findViewById(R.id.btnOk);
52
53 mBtnOk.setOnClickListener(this);
54 mEtName.setText(userInfo.getString(KEY_NAME, ""));
55 if (userInfo.getBoolean(KEY_MARK, true)) {
56 mEtPassword.setText(userInfo.getString(KEY_PASSWORD, ""));
57 mCbMark.setChecked(true);
58 }
59 else {
60 mEtPassword.setText("");
61 mCbMark.setChecked(false);
62 }
63
64 }
65 }
布局文件：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:tools="http://schemas.android.com/tools"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent"
6 android:paddingBottom="@dimen/activity_vertical_margin"
7 android:paddingLeft="@dimen/activity_horizontal_margin"
8 android:paddingRight="@dimen/activity_horizontal_margin"
9 android:paddingTop="@dimen/activity_vertical_margin"
10 tools:context="com.haoye.preferencestest.MainActivity"
11 android:orientation="vertical"
12 android:gravity="center_horizontal"
13 android:weightSum="100">
14
15 <EditText
16 android:id="@+id/etName"
17 android:layout_marginTop="20dp"
18 android:layout_width="300dp"
19 android:layout_height="50dp"
20 android:textSize="24sp"
21 android:hint="@string/name_hint"/>
22 <EditText
23 android:id="@+id/etPassword"
24 android:layout_marginTop="20dp"
25 android:layout_width="300dp"
26 android:layout_height="50dp"
27 android:inputType="textPassword"
28 android:textSize="24sp"
29 android:hint="@string/password_hint"/>
30 <CheckBox
31 android:id="@+id/cbMark"
32 android:layout_width="wrap_content"
33 android:layout_height="wrap_content"
34 android:checked="true"
35 android:text="@string/cb_mark"/>
36 <Button
37 android:id="@+id/btnOk"
38 android:layout_marginTop="20dp"
39 android:layout_width="wrap_content"
40 android:layout_height="wrap_content"
41 android:text="@string/btn_ok"/>
42
43 </LinearLayout>
resources 文件：
<resources>
<string name="app_name">PreferencesTest</string>
<string name="name_hint">请输入用户名</string>
<string name="password_hint">请输入密码</string>
<string name="btn_ok">确定</string>
<string name="cb_mark">记住密码</string>
</resources>
