android中SharedPreferences最常被用来保存用户的一些个人配置。
1、main.xml
<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:orientation="vertical"
>

<TextView
android:text="姓名"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<EditText
android:id="@+id/et_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>

<TextView
android:text="密码"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<EditText
android:id="@+id/et_pwd"
android:password="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>

<Button
android:id="@+id/bt_save"
android:text="保存"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/bt_read"
android:text="读取"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

2、MainActivity.java
public class MainActivity extends Activity {

private Button bt_save,bt_read;
private EditText et_name,et_pwd;

private ShareService ss;

private String name,pwd;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

bt_save = (Button) this.findViewById(R.id.bt_save);
bt_read = (Button) this.findViewById(R.id.bt_read);
et_name = (EditText) this.findViewById(R.id.et_name);
et_pwd = (EditText) this.findViewById(R.id.et_pwd);
ss = new ShareService(this);
bt_save.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

name = et_name.getText().toString();
pwd = et_pwd.getText().toString();
ss.save(name,pwd);
et_name.setText("");
et_pwd.setText("");
}
});
bt_read.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Map<String, String> map = ss.read();
et_name.setText(map.get("name"));
et_pwd.setText(map.get("password"));
}
});

}
}

3、ShareService.java
public class ShareService {

private Context context;
private SharedPreferences preferences = null;


public ShareService(Context context) {
this.context = context;
}

public void save(String name, String pwd) {
preferences = context.getSharedPreferences("temp", Context.MODE_PRIVATE);
Editor editor = preferences.edit();
editor.putString("name", name);
editor.putString("password", pwd);
editor.commit();
}

public Map<String, String> read(){
Map<String, String> map = new HashMap<String, String>();
preferences = context.getSharedPreferences("temp", Context.MODE_PRIVATE);

map.put("name", preferences.getString("name", "isEnmpty"));
map.put("password", preferences.getString("password", "isEnmpty"));
return map;

}

}