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No speakable text present at Android Studio

When adding a field for entering a number(Number widget), the error "No speakable text present at Android Studio" takes off
enter image description here
content_main.xml: enter image description here
activity_main.xml: enter image description here

The problem is you are missing content labeling for the view, you should add content description so the user could simply understand what data he should enter into the view
for example, if you want the user to enter the number of cookies he wants you should add a content description as seen below:
android:contentDescription="Enter How Much Cookies You Want"
You should also add an android:hint so the user would have it in front of them an example of the data you want inputted for example:
android:hint="e.g 5"
So your views XML code should look as follows
<EditText
android:id="#+id/editTextNumber2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="number"
android:minHeight="48dp"
android:contentDescription="Enter How Much Cookies You Want"
android:hint="e.g 8" />

The solution is simple you just need to add the text into the hint part.
search hint in search-bar ant type something in hint block.
and hit Enter.enter image description here

The problem is missing constraints. Any view you add in Constraint layout, you must set the margins otherwise you will get those errors and even if your app managed to run, your edit text will not be place properly.
Add this to your editText;
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
Let me know if it worked.
Remember you can twick this to your desired position.

My TextView is disappearing when I apply an email autolink attribute to it

I am attempting to make a textview clickable by adding an email autolink attribute to it with android:autoLink="email"but as soon as I add it, the text just disappears. What's interesting is that other combinations of text appear just fine. When typing in an email, as soon as I type the "o" in sample#gmail.com, the text just disappears. Am I doing something wrong?
My TextView
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:linksClickable="true"
android:text="sample#gmail.com"
android:clickable="true"
android:autoLink="email"
android:textColor="#54ACE6"
android:textSize="13dp" />

Try to set android:textColorLink="#color/blue" or any other color different than your background.

How to disable the Android text highlighter for buttons?

I'm currently developing an app displaying the default android buttons:
Screenshot
Why is that little blue mark (i don't know the correct name) showing in my app?
This is how I make it visible: I hold the button and then swipe from right to left over the text until the marker appears.
Usually I get that marker in EditText when selecting text - However this is a button and no EditText!
My XML for the button:
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Sign in"
android:id="#+id/loginButton"
android:layout_below="#+id/mainLin"
android:layout_centerHorizontal="true"
android:backgroundTint="#2196F3"
android:textColor="#333"
android:textAllCaps="false"
android:layout_gravity="right"
android:enabled="true"
android:layout_marginTop="5dp" />

try in your XML :
android:textIsSelectable="false"
android:longClickable="false"

Custom button programmatically android

I'm creating a list of buttons in Android with the same icon for each of them and then set the text programmatically. So my list has:
ImageView (always the same) + Text (label for the icon which I set programmatically).
How can I create a something like the icon below but where I can change text dinamically?
Thank you!

You can use android:drawableLeft attribute in the TextView. Here's the sample:
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:id="#+id/textView"
android:gravity="center_vertical"
android:layout_margin="16dp"
android:drawableLeft="#drawable/ic_launcher"
/>
And the result

I would suggest you using the following
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_text"
android:drawableLeft="#drawable/button_icon"
... />
If you are looking for more customized button, then probably you should learn more about Custom Views:
https://developer.android.com/training/custom-views/index.html

What I understand from your question is that you want to change/set the text of the button programmatically.
for this use the following code in onCreate event:
Button mybutton = (Button) findViewById(R.id.your_button_name);
mybutton.setText("Your Text Here");

Custom Keypad -- How to make these buttons functional?

I have an app that I have almost finished which is a scoreboard app. When the user does a LongClick on the score, currently a dialog box appears which shows an EditText field with an OK and CANCEL button. When the user clicks the EditText field a keypad appears (numbers only) in which the user types in the new score, clicks DONE and then the EditText field shows the new value in the dialog box and when the user clicks OK it saves the entered value to the TextView showing the current score.
The problem is that I feel it is cumbersome. Here is what I would like to happen:
User does a LongClick on score
Keypad appears
User enters new score
User clicks OK
Keypad disappears and value is saved to the TextView updating the current score.
In order to accomplish this, I thought of two things:
I could create a new class extending View -- I'm too new to android to really understand this option.
I could replace the EditText in the dialog with a new XML file which is designed like a keypad.
Option 2: I figured this would probably be the easiest so I have designed the XML Layout and called it keypad.xml. Now when the user does a LongClick the keypad.xml file inflates in a dialog with OK and CANCEL. So far so good. However, I don't know where I should put the code for the button actions.
At first thought, I figured that I could setup some onClick listener which is for ALL BUTTONS in the layout. I figured that all buttons are going to perform the exact same function. Basically, get the text from the button (in this case 0-9) and append it to the TextView which is just above the keypad. Then when the user clicks OK save the TextView in keypad.xml to the current score textview.
Can anyone help point me in the right direction to accomplish this please?
Here is the screenshot of keypad.xml (there is an empty TextView above the numbers):
Here is the XML code:
<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="fill"
android:columnCount="3" >
<TextView
android:id="#+id/textView1"
android:layout_columnSpan="3"
android:layout_gravity="fill"
android:gravity="right|center_vertical"
android:textSize="24sp" />
<Button android:text="1" />
<Button android:text="2" />
<Button android:text="3" />
<Button android:text="4" />
<Button android:text="5" />
<Button android:text="6" />
<Button android:text="7" />
<Button android:text="8" />
<Button android:text="9" />
<Button
android:layout_columnSpan="3"
android:layout_gravity="fill"
android:gravity="center"
android:text="0" />

This Question has not seemed to prompt a response. In case anyone is looking for an answer to this, I have come up with another solution which isn't exactly the same but works none the less.
Please see this question.