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Android Create Custom Keyboard

Board
I want to create a custom keyboard like below, where the icon will be there in suggestions, on clicking that will open a separate view in the key I attached screens, I don't know how to start
And also there should be a edit text in it.
I should be able to enter text in both places

Here
is custom keyboard sample, You can get the idea about how to start

How to make a custom keyboard in andorid

I want to make a custom keyboard in android. is any body help me how to make custom keyboard in android.
and one more question, how to make a emoji button in custom keyboard. i want to use mine own emoji's. is it possible??

Yes you can create your own keyboard with emoji's you have to use inputmathod service to create your own keyboard (You can take help from this link)
This link also

How to enter special characters in an EditText in Android?

Is there any way to input special characters (which are not present in the default soft keyboard ,eg. theta) in an Android EditText?
Thanks..

Well as per your need, I would like to suggest to create a custom keyboard because the stock keyboard which comes with the device may not have the special characters you need.
You can refer the following tutorial to create a custom keyboard
http://www.fampennings.nl/maarten/android/09keyboard/index.htm
or you can see this search result which may serve your purpose,
https://github.com/search?q=android+custom+keyboard&ref=cmdform
And from below site you can get the list of Unicode characters which Android supports,
http://en.wikipedia.org/wiki/List_of_Unicode_characters
http://unicode-table.com/en/#0026
Note: Writing the whole code to create a custom keyboard is beyond the scope of this answer, so I mentioned the reference link.

What you are going to do is to create a custom keyboard. First thing you want is to hide the default keyboard when an EditText is focused:
getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
Now, you must create a custom layout (RelativeLayout or Multiple LinearLayouts this is your desire), create and set text to the buttons that you want to show. Make this keyboard view setVisibility(View.INVISIBLE) or setVisibility(View.GONE), and whenever your EditText is focused, make it setVisibility(View.VISIBLE).
After keyboard is visible, programming the rest is up to you it is practically easy.
If you also need a guide, here is an example.

Creating an Android Keyboard with Listview layout inside

I have been trying to modify the SoftKeyboard example to insert a custom layout of buttons, checkboxes, radiobuttons etc, but I was unable to do so. The keyboard shows as blank each time I try using it. I tried modifying qwerty.xml as well as input.xml, but no luck.
Is this even possible using the SoftKeyboard sample, or by any other means?

android soft keyboard modifications

Is there a way to programmatically remove certain keys from the standard software keyboard. By setting some of the input type flags I am so close to having the keyboard I need. From the calling application is there a way to modify the keyboard directly. I know how to make my own custom keyboard but it seems such a waste to remove one button from the standard one.
////// edit///////
I think I found a way around this if any one has tried this method please let me know if it worked for you.
I have going to grab the softKeyboard service and using the start hook the keyboard uses to grab its view object inflate my own and swap them.

From my research there is no way to implement your own custom keyboard from within a single application. If you want to have a custom keyboard you need to create one from scratch and can not use the IME

soft keyboard comes for edit text. you can modify the softkeyboard for that edit text.
For that you need to set inputType and imeOption property of that edit text.