封装sharePreference实现本地存储key/value

实现一个工具类 SharePreferenceUtil

package com.adv.client.utils;

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

import java.util.Map;


public class SharePreferenceUtil {
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor editor;
    //sharePreference sava file name
    public static final String MQTTCONFIG = "mqttconfig";

    public SharePreferenceUtil(Context context, String FILE_NAME) {
        sharedPreferences = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        editor = sharedPreferences.edit();
    }

  //put value
    public void put(String key, Object object) {
        if (object instanceof String) {
            editor.putString(key, (String) object);
        } else if (object instanceof Integer) {
            editor.putInt(key, (Integer) object);
        } else if (object instanceof Boolean) {
            editor.putBoolean(key, (Boolean) object);
        } else if (object instanceof Float) {
            editor.putFloat(key, (Float) object);
        } else if (object instanceof Long) {
            editor.putLong(key, (Long) object);
        } else {
            editor.putString(key, object.toString());
        }
        editor.commit();
    }

 //get value
    public Object getSharedPreference(String key, Object defaultObject) {
        if (defaultObject instanceof String) {
            return sharedPreferences.getString(key, (String) defaultObject);
        } else if (defaultObject instanceof Integer) {
            return sharedPreferences.getInt(key, (Integer) defaultObject);
        } else if (defaultObject instanceof Boolean) {
            return sharedPreferences.getBoolean(key, (Boolean) defaultObject);
        } else if (defaultObject instanceof Float) {
            return sharedPreferences.getFloat(key, (Float) defaultObject);
        } else if (defaultObject instanceof Long) {
            return sharedPreferences.getLong(key, (Long) defaultObject);
        } else {
            return sharedPreferences.getString(key, null);
        }
    }

    //remove value by key
    public void remove(String key) {
        editor.remove(key);
        editor.commit();
    }

 //remove all value
    public void clear() {
        editor.clear();
        editor.commit();
    }

  //check value by key
    public Boolean contain(String key) {
        return sharedPreferences.contains(key);
    }

  //return map
    public Map<String, ?> getAll() {
        return sharedPreferences.getAll();
    }
}

然后调用其中的方法

存储：

SharePreferenceUtil sharePreferenceUtil = new SharePreferenceUtil(MainActivity.this, SharePreferenceUtil.MQTTCONFIG);

sharePreferenceUtil.put("mqttServerIp", mqttServerIp);
sharePreferenceUtil.put("mqttServerPort", mqttServerPort);

读取和判断：

if(sharePreferenceUtil.contain("mqttServerIp") && sharePreferenceUtil.contain("mqttServerPort")){
    this.hostname = sharePreferenceUtil.getSharedPreference("mqttServerIp", "").toString();
    this.portNumber =Integer.parseInt(sharePreferenceUtil.getSharedPreference("mqttServerPort",  "").toString());
    Log.i("sharePreference", this.hostname+":"+this.portNumber);
}else{
    this.hostname = properties.getProperty("MQTT_SERVER");
    this.portNumber = Integer.parseInt(properties.getProperty("MQTT_PORT"));
}