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：

 public class MainActivity
         extends AppCompatActivity
         implements View.OnClickListener {
     private EditText mEtName;
     private EditText mEtPassword;
     private CheckBox mCbMark;
     private Button   mBtnOk;
     private final String KEY_NAME     = "name";
     private final String KEY_PASSWORD = "password";
     private final String KEY_MARK     = "mark";

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         initViews();
     }

     @Override
     public void onClick(View v) {
         String name = mEtName.getText().toString().trim();
         String password = mEtPassword.getText().toString().trim();
         if ("".equalsIgnoreCase(name) || "".equalsIgnoreCase(password)) {
             Toast.makeText(this, "账号和密码不能为空！", Toast.LENGTH_LONG).show();
         }
         else {
             SharedPreferences userInfo = getSharedPreferences("user_info", MODE_PRIVATE);
             SharedPreferences.Editor editor = userInfo.edit();
             editor.putString(KEY_NAME, name);
             editor.putBoolean(KEY_MARK, mCbMark.isChecked());
             if (mCbMark.isChecked()) {
                 editor.putString(KEY_PASSWORD, password);
             }
             else {
                 editor.putString(KEY_PASSWORD, "");
             }
             editor.apply();//---应用操作

             Toast.makeText(this, "用户信息保存成功！", Toast.LENGTH_LONG).show();
         }
     }

     private void initViews() {
         SharedPreferences userInfo = getSharedPreferences("user_info", MODE_PRIVATE);

         mEtName     = (EditText)findViewById(R.id.etName);
         mEtPassword = (EditText)findViewById(R.id.etPassword);
         mCbMark     = (CheckBox)findViewById(R.id.cbMark);
         mBtnOk      = (Button)findViewById(R.id.btnOk);

         mBtnOk.setOnClickListener(this);
         mEtName.setText(userInfo.getString(KEY_NAME, ""));
         if (userInfo.getBoolean(KEY_MARK, true)) {
             mEtPassword.setText(userInfo.getString(KEY_PASSWORD, ""));
             mCbMark.setChecked(true);
         }
         else {
             mEtPassword.setText("");
             mCbMark.setChecked(false);
         }

     }
 }

布局文件：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.haoye.preferencestest.MainActivity"
     android:orientation="vertical"
     android:gravity="center_horizontal"
     android:weightSum="100">

     <EditText
         android:id="@+id/etName"
         android:layout_marginTop="20dp"
         android:layout_width="300dp"
         android:layout_height="50dp"
         android:textSize="24sp"
         android:hint="@string/name_hint"/>
     <EditText
         android:id="@+id/etPassword"
         android:layout_marginTop="20dp"
         android:layout_width="300dp"
         android:layout_height="50dp"
         android:inputType="textPassword"
         android:textSize="24sp"
         android:hint="@string/password_hint"/>
     <CheckBox
         android:id="@+id/cbMark"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:checked="true"
         android:text="@string/cb_mark"/>
     <Button
         android:id="@+id/btnOk"
         android:layout_marginTop="20dp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btn_ok"/>

 </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>