删除数据库后未调用ContentProvider onCreate [英] ContentProvider not called onCreate after deleting database

问题描述

我创建了ContentProvider，它在启动应用程序时创建了一个数据库.

I have created ContentProvider which creates one Database on application launching.

现在，在该应用程序中，当用户从应用程序注销时，我正在执行删除数据库的过程.

Now In that application, I am doing process of deleting database when user logout from app.

之后，当我再次登录时，ContentProvider无法调用覆盖类的 onCreate().

After that when I come again to login, the ContentProvider cant call onCreate() of overrided class.

是否可以使用ContentProvider重新创建数据库?

Is there any way to recreate database using ContentProvider?

推荐答案

我找到了解决方案，

首先，我引用了在还原后在自定义ContentProvider中刷新/重新加载数据库引用，但对答案不满意，因为它只是用于关闭数据库.

First of all I referred Refresh/Reload database reference in custom ContentProvider after restore but not satisfied with answer because its just for closing database.

所以我创建了如下答案:

So I have created my answer as below:

DBHelper.java

/**
 * Delete database
 */
public static void reCreateDatabase(Context mContext) {
    ContentResolver resolver = mContext.getContentResolver();
    ContentProviderClient client = resolver.acquireContentProviderClient(KOOPSContentProvider.AUTHORITY);

    assert client != null;
    KOOPSContentProvider provider = (KOOPSContentProvider) client.getLocalContentProvider();

    assert provider != null;
    provider.resetDatabase();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
        client.close();
    else
        client.release();

    LOGD("Database Deleted...");
}

public void removeDatabase(Context mContext) {
    mContext.deleteDatabase(DATABASE_NAME);
    LOGD("Database Deleted...");
}

KOOPSContentProvider.java

public void resetDatabase() {
    if(dbHelper != null) {
        dbHelper.removeDatabase(getContext());
        dbHelper = new DbHelper(getContext());
    } else {
        LOGD("Database NULL");
    }
}

用途为:

DbHelper.reCreateDatabase(mContext);

谢谢:):)

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