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How to use an existing database with an Android application [duplicate]
...low the below:
DataHelper class:
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import a...
What exactly does big Ө notation represent?
I'm really confused about the differences between big O, big Omega, and big Theta notation.
6 Answers
...
Implicit type conversion rules in C++ operators
I want to be better about knowing when I should cast. What are the implicit type conversion rules in C++ when adding, multiplying, etc. For example,
...
Why both no-cache and no-store should be used in HTTP response?
... a cache
MUST NOT use the response to satisfy a
subsequent request without successful
revalidation with the origin server.
In my application, if you visited a page with the no-cache header, then logged out and then hit back in your browser, IE6 would still grab the page from the cache (witho...
What's the difference between identifying and non-identifying relationships?
...mary key. But the logical relationship is that the child cannot exist without the parent.
Example: A Person has one or more phone numbers. If they had just one phone number, we could simply store it in a column of Person. Since we want to support multiple phone numbers, we make a second table Ph...
Determine the type of an object?
...return the immediate type of the object, but won’t be able to tell you about type inheritance.
>>> type(b) is Test1
False
To cover that, you should use the isinstance function. This of course also works for built-in types:
>>> isinstance(b, Test1)
True
>>> isinstance...
How to turn on front flash light programmatically in Android?
...ager.html for more information.
For turning on/off flashlight:
I googled out and got this about android.permission.FLASHLIGHT. Android manifests' permission looks promising:
<!-- Allows access to the flashlight -->
<permission android:name="android.permission.FLASHLIGHT"
a...
PHP foreach change original array values
...ode readability.
Creating references in PHP is something that quickly gets out of hand. If you are a novice and don't have full control of what you are doing, it is best to stay away from references. For more information about & operator take a look at this guide: Reference — What does this sy...
Calling shell functions with xargs
...{} directly inside it. But it's vulnerable to command injection as pointed out by @Sasha.
Here is an example why you should not use the embedded format:
$ echo '$(date)' | xargs -I {} bash -c 'echo_var "{}"'
Sun Aug 18 11:56:45 CDT 2019
Another example of why not:
echo '\"; date\"' | xargs -I {...
UICollectionView inside a UITableViewCell — dynamic height?
...ink. Put your cells into NIBs (or storyboards) and pin them to let auto layout do all the work
Given the following structure:
TableView
TableViewCell
CollectionView
CollectionViewCell
CollectionViewCell
Collect...