android采取SharedPreferences保存用户偏好设置参数

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>

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"));			}		});            }}

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;			}}