以编程方式获取我的应用程序的数据库目录

I want to use a "pre loaded" database in my app. There are tons of questions about this and most point to this blog article here or similars.

我想在我的应用程序中使用“预加载”数据库。关于这一点有很多问题，大多数都指向这篇博客文章或类似的。

So far so good. I just want to know if there is a better way to get the default databases directory so you don't have to use something like this:

到现在为止还挺好。我只是想知道是否有更好的方法来获取默认数据库目录，所以你不必使用这样的东西：

private static String DB_PATH = "/data/data/YOUR_PACKAGE/databases/";

I mean, maybe that is changed in the future or maybe a device or rom could place it elsewhere... so is there a way to get this path programatically?

我的意思是，未来可能会改变，或者设备或ROM可能会将其放在其他地方......那么有没有办法以编程方式获取此路径？

In Context exists a method to getDatabasePath(name), but you need to give it an existing db name and well... it doesn't exist yet, I want to move it there :P

在Context中存在一个getDatabasePath（name）的方法，但你需要给它一个现有的db名称，而且......它还不存在，我想把它移到那里：P

5 个解决方案

#1

Create an empty DB, get the path with getDatabasePath(), then overwrite it with your own.

创建一个空数据库，使用getDatabasePath（）获取路径，然后用自己的数据覆盖它。

#2

I used...

我用了...

String destPath = getFilesDir().getPath();
destPath = destPath.substring(0, destPath.lastIndexOf("/")) + "/databases";

#3

Used by SQLiteAssetHelper:

由SQLiteAssetHelper使用：

 String path = mContext.getDatabasePath(mName).getPath();

At this time, the database doesn't exist. I think the String just takes the internal path and adds the appropriate modifiers. In fact, this seems to work just fine:

这时，数据库不存在。我认为String只是采用内部路径并添加适当的修饰符。事实上，这似乎工作得很好：

context.getDatabasePath("a").getParentFile()

Basically, you don't need to have a real database created, just ask it for one.

基本上，您不需要创建一个真正的数据库，只需要一个。

#4

You can use the Method getFilesDir() or getDatabasePath in an Activity-Class to get this Folder.
More info here

您可以在Activity-Class中使用方法getFilesDir（）或getDatabasePath来获取此文件夹。更多信息在这里

#5

You can use getDatabasePath method in your Helper class:

您可以在Helper类中使用getDatabasePath方法：

public class MyDatabase extends SQLiteAssetHelper {

    private static final String DATABASE_NAME = "wl.db";
    private static final int DATABASE_VERSION = 1;  
    public String databasePath = "";    

    public MyDatabase(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

        // you can use an alternate constructor to specify a database location
        // (such as a folder on the sd card)
        // you must ensure that this folder is available and you have permission
        // to write to it
        // super(context, DATABASE_NAME, context.getExternalFilesDir(null).getAbsolutePath(), null, DATABASE_VERSION);

        databasePath = context.getDatabasePath("wl.db").getPath();
    }

#1