Android SharedPreferences的简单封装

SP数据保存在/data/data/<package name>/shared_prefs目录下且以XML格式保存的。

SPUtils

package com.example.shen.sputil.utils;

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

/**
 * Created by shen on 2016/2/26.
 */
public class SPUtil {
    private SharedPreferences preferences;
    private SharedPreferences.Editor editor;

    public SPUtil(Context context, String fileName) {
        preferences = context.getSharedPreferences(fileName, context.MODE_PRIVATE);
        editor = preferences.edit();
    }


    /**
     * 向SP存入指定key对应的数据
     * 其中value可以是String、boolean、float、int、long等各种基本类型的值
     * @param key
     * @param value
     */
    public void putString(String key, String value) {
        editor.putString(key, value);
        editor.commit();
    }

    public void putBoolean(String key, boolean value) {
        editor.putBoolean(key, value);
        editor.commit();
    }

    public void putFloat(String key, float value) {
        editor.putFloat(key, value);
        editor.commit();
    }

    public void putInt(String key, int value) {
        editor.putInt(key, value);
        editor.commit();
    }

    public void putLong(String key, long value) {
        editor.putLong(key, value);
        editor.commit();
    }

    /**
     * 清空SP里所以数据
     */
    public void clear() {
        editor.clear();
        editor.commit();
    }

    /**
     * 删除SP里指定key对应的数据项
     * @param key
     */
    public void remove(String key) {
        editor.remove(key);
        editor.commit();
    }

    /**
     * 获取SP数据里指定key对应的value。如果key不存在，则返回默认值defValue。
     * @param key
     * @param defValue
     * @return
     */
    public String getString(String key, String defValue) {
        return preferences.getString(key, defValue);
    }

    public boolean getBoolean(String key, boolean defValue) {
        return preferences.getBoolean(key, defValue);
    }

    public float getFloat(String key, float defValue) {
        return preferences.getFloat(key, defValue);
    }

    public int getInt(String key, int defValue) {
        return preferences.getInt(key, defValue);
    }

    public long getLong(String key, long defValue) {
        return preferences.getLong(key, defValue);
    }

    /**
     * 判断SP是否包含特定key的数据
     * @param key
     * @return
     */
    public boolean contains(String key){
        return preferences.contains(key);
    }

}

使用

package com.example.shen.sputil.activity;

import android.app.Activity;
import android.os.Bundle;

import com.example.shen.sputil.R;
import com.example.shen.sputil.utils.SPUtil;


public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SPUtil spUtil=new SPUtil(this,"fileName");
        spUtil.clear();
        spUtil.putString("key1","value1");
        spUtil.putInt("key2", 123);
        spUtil.getString("key1", "");
        spUtil.getInt("key2",0);
    }
}

秒客网

Android SharedPreferences的简单封装

相关文章