SharedPreferences 数据存储

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<String, String> 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"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/name"
    />
    
    <EditText
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/name"
    />
    
    <TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/age"
    />
    
    <EditText
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:numeric="integer"
    android:id="@+id/age"
    />
    
    <Button
     android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/button"
    android:onClick="save"
    />
</LinearLayout>

value/string.xml 配置文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">软件参数设置</string>
    <string name="name">姓名</string>
    <string name="age">年龄</string>
    <string name="button">保存参数</string>
    <string name="success">保存完成</string>
</resources>

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<String, String> getPreferences(){
		Map<String, String> params = new HashMap<String, String>();
		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;
	}
}