SharedPreferences 数据存储

阅读更多 MainActivity.java代码

package cn.itcast.settings;import java.util.Map;import cn.itcast.service.PreferencesService;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private EditText nameText;    private EditText ageText;    private PreferencesService service;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        nameText = (EditText) this.findViewById(R.id.name);        ageText = (EditText) this.findViewById(R.id.age);        service = new PreferencesService(this);        Map params = service.getPreferences();        nameText.setText(params.get("name"));        ageText.setText(params.get("age"));    }        public void save(View v){    String name = nameText.getText().toString();    String age = ageText.getText().toString();    service.save(name, Integer.valueOf(age));    Toast.makeText(getApplicationContext(), R.string.success, 1).show();    }        }

layout/main.xml

<?xml version="1.0" encoding="utf-8"?>

value/string.xml 配置文件

<?xml version="1.0" encoding="utf-8"?>    Hello World, MainActivity!    软件参数设置    姓名    年龄    保存参数    保存完成

核心操作类 PerferencesServer.java

package cn.itcast.service;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;public class PreferencesService {private Context context;public PreferencesService(Context context) {this.context = context;}/** * 保存参数 * @param name 姓名 * @param age 年龄 */public void save(String name, Integer age) {SharedPreferences preferences = context.getSharedPreferences("itcast", Context.MODE_PRIVATE);Editor editor = preferences.edit();editor.putString("name", name);editor.putInt("age", age);editor.commit();}/** * 获取各项配置参数 * @return */public Map getPreferences(){Map params = new HashMap();SharedPreferences preferences = context.getSharedPreferences("itcast", Context.MODE_PRIVATE);params.put("name", preferences.getString("name", ""));params.put("age", String.valueOf(preferences.getInt("age", 0)));return params;}}

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