Android应用中为用户保存偏好设置（传智播客视频笔记）

应用生成的XML文件保存在/data/data/应用包名/shared_prefs/name.xml中

(/data/data/com.sinaapp.shared/shared_prefs/ssun.xml)

SharedPreferenceActivity.java源码：

package com.sinaapp.shared;

import java.util.Map;

import com.sinaapp.service.Service;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Toast;

public class SharedPreferenceActivity extends Activity {
    /** Called when the activity is first created. */
	EditText nameText;
	EditText ageText;	
	Service service;
	Map<String, String> map;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        nameText = (EditText)this.findViewById(R.id.nametext);
        ageText = (EditText)this.findViewById(R.id.agetext);
        service = new Service(this);
        map = service.getPreference();
        nameText.setText(map.get("name"));
        ageText.setText(map.get("age"));
    }
   
    
    public void save(View v){
    	String name = nameText.getText().toString();
    	int age = Integer.parseInt(ageText.getText().toString());
    	service.save(name,age);
    	Toast.makeText(getApplicationContext(), "save success!", Toast.LENGTH_LONG).show();
    }
}

Service.java源码：

package com.sinaapp.service;

import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class Service {
	private Context context;
	
	public Service(Context context){
		this.context = context;
	}
	
	/**
	 * 保存参数
	 * @param name 
	 * @param age
	 */
	public void save(String name, int age){
		SharedPreferences preferences  = context.getSharedPreferences("ssun", Context.MODE_PRIVATE);
		Editor edit = preferences.edit();
		edit.putString("name", name);
		edit.putInt("age", age);
		edit.commit();
	}
	
	/**
	 * 
	 * @return 以前设定的参数
	 */
	public Map<String,String> getPreference(){
		SharedPreferences preferences  = context.getSharedPreferences("ssun", Context.MODE_PRIVATE);
		Map<String,String> map = new HashMap<String, String>();
		map.put("name", preferences.getString("name", ""));
		map.put("age", String.valueOf((preferences.getInt("age", 0))));
		return map;
	}
}

main.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/name" />

    <EditText
        android:id="@+id/nametext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text"
        android:ems="10" >

        <requestFocus />
    </EditText>

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

    <EditText
        android:id="@+id/agetext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/save"
        android:onClick="save" />

</LinearLayout>

strings.xml文件：

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

    <string name="name">姓名</string>
    <string name="age">年龄</string>
    <string name="app_name">用户参数设置</string>
	<string name="save">保存</string>
</resources>