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How to pass data from 2nd activity to 1st activity when pressed back? - android
...ext data from Activity2.
For example:
In Activity1, start Activity2 as:
Intent i = new Intent(this, Activity2.class);
startActivityForResult(i, 1);
In Activity2, use setResult for sending data back:
Intent intent = new Intent();
intent.putExtra("editTextValue", "value_here")
setResult(RESULT_O...
Wrap a delegate in an IEqualityComparer
...;
{
readonly Func<T, T, bool> _comparer;
readonly Func<T, int> _hash;
public FuncEqualityComparer( Func<T, T, bool> comparer )
: this( comparer, t => 0 ) // NB Cannot assume anything about how e.g., t.GetHashCode() interacts with the comparer's behavior
...
Numpy - add row to array
...e necessary after every row, it's much quicker to add rows in python, then convert to numpy. Here are timing tests using python 3.6 vs. numpy 1.14, adding 100 rows, one at a time:
import numpy as np
from time import perf_counter, sleep
def time_it():
# Compare performance of two methods for a...
Swift days between two NSDates
... Swift 2:
func daysBetweenDates(startDate: NSDate, endDate: NSDate) -> Int
{
let calendar = NSCalendar.currentCalendar()
let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: [])
return components.day
}
...
Purpose of returning by const value? [duplicate]
...eans const &&, but is it really true?! e.g. VS13 allows me to bind int&& var= to a function which returns const int. "The result of calling a function whose return type is not a reference is a prvalue".
– Karlis Olte
May 31 '15 at 21:49
...
How can I concatenate two arrays in Java?
...d return the result:
public <T> T[] concatenate(T[] a, T[] b) {
int aLen = a.length;
int bLen = b.length;
@SuppressWarnings("unchecked")
T[] c = (T[]) Array.newInstance(a.getClass().getComponentType(), aLen + bLen);
System.arraycopy(a, 0, c, 0, aLen);
System.arraycopy...
Drop data frame columns by name
...
the subset function works better as it won't convert a data frame with one column into a vector
– mut1na
Jun 28 '13 at 9:06
3
...
Android Shared preferences for creating one time activity (example) [closed]
...and after filling and saving the form data in database(SQLITE). I am using intent from A to B and then B to C.What i want is that every time I open my app I want C as my home screen and not A and B anymore.
...
App Inventor 2 扩展 · App Inventor 2 中文网
...reate extension components
3.1 Practice creating a sample component
3.2 Convert your sample component to an extension
3.2.2 Test your extension
3.3 Details on creating extensions
3.3.1 When you start to build
3.3.2 Requesting permissions for the extensions you define
3.2.3 Using external li...
How to change the status bar color in Android?
...
Android 5.0 Lollipop introduced Material Design theme which automatically colors the status bar based on the colorPrimaryDark value of the theme.
This is supported on device pre-lollipop thanks to the library support-v7-appcompat starting from ...