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>