SharedPreferences 平滑迁移到MMKV

Posted 2023-02-27 安果移不动

以往，我们习惯封装。SharedPreferences 来对本地数据进行存取

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


class QuickPreference(context: Context, name: String, mode: Int = Context.MODE_PRIVATE) 

    private val mSP: SharedPreferences = context.getSharedPreferences(name, mode)

    fun clear() = mSP.edit().clear().commit()

    fun remove(key: String) = mSP.edit().remove(key).commit()

    fun putString(key: String, value: String) = setString(key, value)


    fun setInt(key: String, value: Int) = mSP.edit().putInt(key, value).commit()

    fun getInt(key: String, def: Int = 0) = mSP.getInt(key, def)

    fun setLong(key: String, value: Long) = mSP.edit().putLong(key, value).commit()

    fun getLong(key: String, def: Long = 0L) = mSP.getLong(key, def)

    fun setBoolean(key: String, value: Boolean) = mSP.edit().putBoolean(key, value).commit()

    fun getBoolean(key: String, def: Boolean = false) = mSP.getBoolean(key, def)

    fun setFloat(key: String, value: Float) = mSP.edit().putFloat(key, value).commit()

    fun getFloat(key: String, def: Float = 0f) = mSP.getFloat(key, def)

    fun setString(key: String, value: String) = mSP.edit().putString(key, value).commit()

    fun getString(key: String, def: String = "") = mSP.getString(key, def) ?: ""

但是有一天。红米note11 Pro 毫无征兆的出现问题了

Couldn't create directory for SharedPreferences file /data/user/0

 巴拉巴拉 直接让应用启动不起来了。

那么就迁移到MMKV ，为了照顾老用户的用户习惯，登录信息等

import android.content.Context
import android.content.SharedPreferences
import com.tencent.mmkv.MMKV


class QuickPreference(context: Context, name: String, mode: Int = Context.MODE_PRIVATE) 

    init 
        val sharedPreferences = context.getSharedPreferences(name, mode)

        if (sharedPreferences.all.isNotEmpty()) 
            MMKV.defaultMMKV().importFromSharedPreferences(sharedPreferences);
            sharedPreferences.edit().clear().apply()
        


    


    fun clear() =  MMKV.defaultMMKV().edit().clear().commit()

    fun remove(key: String) =  MMKV.defaultMMKV().edit().remove(key).commit()

    fun putString(key: String, value: String) = setString(key, value)


    fun setInt(key: String, value: Int) =  MMKV.defaultMMKV().edit().putInt(key, value).commit()

    fun getInt(key: String, def: Int = 0) =  MMKV.defaultMMKV().getInt(key, def)

    fun setLong(key: String, value: Long) =  MMKV.defaultMMKV().edit().putLong(key, value).commit()

    fun getLong(key: String, def: Long = 0L) =  MMKV.defaultMMKV().getLong(key, def)

    fun setBoolean(key: String, value: Boolean) =  MMKV.defaultMMKV().edit().putBoolean(key, value).commit()

    fun getBoolean(key: String, def: Boolean = false) =  MMKV.defaultMMKV().getBoolean(key, def)

    fun setFloat(key: String, value: Float) =  MMKV.defaultMMKV().edit().putFloat(key, value).commit()

    fun getFloat(key: String, def: Float = 0f) =  MMKV.defaultMMKV().getFloat(key, def)

    fun setString(key: String, value: String) =  MMKV.defaultMMKV().edit().putString(key, value).commit()

    fun getString(key: String, def: String = "") =  MMKV.defaultMMKV().getString(key, def) ?: ""

 核心代码就是这段。如果有数据那么 拿来把你。

        if (sharedPreferences.all.isNotEmpty()) 
            MMKV.defaultMMKV().importFromSharedPreferences(sharedPreferences);
            sharedPreferences.edit().clear().apply()