Get databases directory for my app programmatically

问题

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.

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:

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?

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

回答1:

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

回答2:

I used...

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

回答3:

Used by SQLiteAssetHelper:

 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:

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

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

回答4:

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

回答5:

You can use getDatabasePath method in your Helper class:

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();
    }

来源：https://stackoverflow.com/questions/12723186/get-databases-directory-for-my-app-programmatically

标签

android

database

sqlite

storage