SharedPreferences 数据存储

[b][size=medium]MainActivity.java代码[/size][/b]


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();
    }


}

[b][size=medium]layout/main.xml[/size][/b]


<?xml version="1.0" encoding="utf-8"?>
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/name"
    />

        android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/name"
    />

        android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/age"
    />

        android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:numeric="integer"
    android:id="@+id/age"
    />

         android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/button"
    android:onClick="save"
    />

[b][size=medium]value/string.xml 配置文件[/size][/b]


<?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

[b][size=medium]核心操作类 PerferencesServer.java[/size][/b]


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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