Android配置LitePal

Posted 2021-09-09 Demon121884344

文章目录

• 1、引入库
• 2、配置litepal.xml
• 3、配置LitePalApplication

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1、引入库

项目地址:https://github.com/guolindev/LitePal

在 build.gradle 中如下配置

dependencies {
    implementation 'org.litepal.guolindev:core:3.2.3'
}

2、配置litepal.xml

在main文件下新建文件夹assets，再在其中创建litepal.xml文件

<?xml version="1.0" encoding="utf-8"?>
<litepal>
    <!--
    	Define the database name of your application. 
    	By default each database name should be end with .db. 
    	If you didn't name your database end with .db, 
    	LitePal would plus the suffix automatically for you.
    	For example:    
    	<dbname value="demo" />
    -->
    <dbname value="demo" />

    <!--
    	Define the version of your database. Each time you want 
    	to upgrade your database, the version tag would helps.
    	Modify the models you defined in the mapping tag, and just 
    	make the version value plus one, the upgrade of database
    	will be processed automatically without concern.
			For example:    
    	<version value="1" />
    -->
    <version value="1" />

    <!--
    	Define your models in the list with mapping tag, LitePal will
    	create tables for each mapping class. The supported fields
    	defined in models will be mapped into columns.
    	For example:    
    	<list>
    		<mapping class="com.test.model.Reader" />
    		<mapping class="com.test.model.Magazine" />
    	</list>
    -->
    <list>
    </list>
    
    <!--
        Define where the .db file should be. "internal" means the .db file
        will be stored in the database folder of internal storage which no
        one can access. "external" means the .db file will be stored in the
        path to the directory on the primary external storage device where
        the application can place persistent files it owns which everyone
        can access. "internal" will act as default.
        For example:
        <storage value="external" />
    -->
    
</litepal>

3、配置LitePalApplication

在 androidManifest.xml 文件中配置如下：

<manifest>
    <application
        android:name="org.litepal.LitePalApplication"
        ...
    >
        ...
    </application>
</manifest>

如果这一步出现 LitePalApplication 标红的情况，需要重新同步一下。

当然这一步也可以不配置，在onCreate() 方法中添加：

public class MyOwnApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        LitePal.initialize(this);
    }
    ...
}

LitePal.initialize() 方法必须传入Context参数，而不能是activity 或者 service 实例。这样的话必须经常传入参数Context，十分繁琐。

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