How to develop a custom keyboard with toolbar / Keyboard menu? - android

I see this github projects:-
https://github.com/rkkr/simple-keyboard
And
https://github.com/NlptechProduct/Android-Keyboard
but i don't understand code.
Please give me any suggestion or demo And which not use KeyboardView because this is deprecated.
This class was deprecated in API level 29. This class is deprecated
because this is just a convenient UI widget class that application.
Developers can re-implement on top of existing public APIs. If you
have already depended on this class, consider copying the
implementation from AOSP into your project or re-implementing a
similar widget by yourself.
or explain me about android keyboard how can i develop.
or suggest me how can i develop my custom keyboard app.

Related

How to make a keyboard with Android SDK 30? [duplicate]

KeyboardView has been deprecated official by android team in API level 29 and i didn't able to find the alternative way for this. Please let me know if there any alternative?
The only solution Google suggests is copying KeyboardView.java and Keyboard.java files to your local project from Android AOSP. With some customization I managed to make it work as old deprecated KeyboardView and Keyboard Android's classes.
You will also have your local copy of com.android.internal.R attributes (stylable) from from here
You can notice, it is annotated as
<!-- {#deprecated Copy this definition into your own application project.} -->
Google:
This class was deprecated in API level 29. This class is deprecated
because this is just a convenient UI widget class that application
developers can re-implement on top of existing public APIs. If you
have already depended on this class, consider copying the
implementation from AOSP into your project or re-implementing a
similar widget by yourselves

I need to create Android keyboard app, but some classes are depricated

I need to develope android keyboard app, but Android developers website tells that KeyboardView and Keybord classes are deprecated after Api 29, to create the UI for the keyboard.
This class was deprecated in API level 29. The following is the message I found:
This class is deprecated because this is just a convenient UI widget class that application developers can re-implement on top of existing public APIs. If you have already depended on this class, consider copying the implementation from AOSP into your project or re-implementing a similar widget by yourselves
So how shall I develope the app if the classes won't work after Api 29? Any suggestion?
The only solution Google suggests is copying KeyboardView.java and Keyboard.java files to your local project from Android AOSP. With some customization I managed to make it work as old deprecated KeyboardView and Keyboard Android's classes.
You will also have your local copy of com.android.internal.R attributes (stylable) from from here
You can notice, it is annotated as
<!-- {#deprecated Copy this definition into your own application project.} -->

What is Backwards Compatibility in Android Studio?

I'm a newbie to Android Development. Even though I referred the android developer website, I didn't figure out.
On the customize Activity dialog box, when I unchecked the Backwards Compatiblity(Appcompat) in Android Studio 2.3.1 It gave me a hint as:
If false, this activity base class will be Activity instead of AppCompatActivity
Generally, what do android developers prefer? enabling backwards compatibility or without it? Can anyone explain me which one is better.
Android apps can be backward-compatible without checking this checkbox.
If false, this activity base class will be Activity instead of AppCompatActivity
Android studio is letting you know that if you uncheck the "Backwards Compatability(Appcompat)" box, then you'll be including & using the library Activity instead of AppCompatActivity.
For a more detailed comparison between the two, check this: Activity, AppCompatActivity, FragmentActivity, and ActionBarActivity: When to Use Which?
Generally, what do android developers prefer? enabling backwards compatibility or without it?
A comment written by "CommonsWare" explains this best:
An activity created with that checkbox checked is no more backwards compatible than is one without that checkbox checked. Checking the checkbox gives your app a particular look and feel that will retain that look and feel on some older devices; leaving the checkbox unchecked means that some aspects of your look and feel will be different on pre-Android 5.0 devices. This does not impact the core functionality of the activity, though. – CommonsWare
Backwards compatibility allows you to use certain backwards compatible features in your app. They will be able to work on previous versions of Android.
The Android Support Library offers backward-compatible versions of a number of features that are not built into the framework. (Android Support Library website)
For example, instead of Activity, AppCompatActivity will be used and is something that is "backwards" compatible. It can be used all the way back to API level 15.
You should generally use AppCompatActivity to support older Android versions. If your app has no need for older android versions, then just use Activity.
Using AppCompatActivity is generally more recommended.

How can Android use the app compat components automatically?

Recently I'm studying the usage of the appcompat support library and the design support library. And I met a strange question(at least for me) that I can't understand.
In the appcompat support library, there're several AppCompat* like components, such as AppCompatButton, AppCompatCheckBox... There's one same thing among these components - In the official doc all these components have such illustration,
This will automatically be used when you use Button in your layouts.
You should only need to manually use this class when writing custom
views.
or something like this.
Here come's the question. Since Button isn't AppCompatButton, how can it consider it as AppCompatButton when I use Button during the xml or created in code? How does it work?
Forgive my Cantonese English.
Short brief on how the AppComp decided which class to init -
When using the support library (AppCompat) using the support library widgets (e.g. android,support.v4.widget.Button) ,the library will use the appropriate implementation based on your Android OS.
For example ,if your OS support Button it will use the native implementation ,else it will use the AppCompat implementation.
In other words ,it defers to run time to decide what to use..
I assume this is the automatically part..

Preferences without deprecated methods

I'm trying to (correctly) implement a preferences screen, but the problem is that all the methods used to read preferences from xml files are deprecated (or I just don't recognize them). The official sample code on the dev site (PreferenceActivity) uses deprecated methods. Has anyone found out a way to implement a preferences screen with an xml file but without using either: addPreferencesFromResource(int) or findPreference(CharSequence)? Or have the methods just been marked deprecated without implementing the alternative yet?
EDIT: Developing for Android version 2.1
Why its deprecated and what is the alternative is pretty well explained in documentation:
This is the base class for an activity to show a hierarchy of preferences to the user. Prior to HONEYCOMB this class only allowed the display of a single set of preference; this functionality should now be found in the new PreferenceFragment class. If you are using PreferenceActivity in its old mode, the documentation there applies to the deprecated APIs here.
In other words, if you want to be HONEYCOMB compliant, then you should use PreferenceFragment for your PreferenceActivity. A detailed explanation on how to use fragments can be found in dev guide.
In Android 3, API Level 11, the fragment-based preference model was introduced, thus deprecating methods that "is not relevant for a modern fragment-based PreferenceActivity."
Since the online reference is the latest version, it shows the methods as deprecated. By manipulating the API Level dropdown, you can mark the methods that are not in the given Android version, but it doesn't update the descriptions to match, which is why it still shows up as deprecated.
If you don't plan on supporting Android 3+ you should just use the old methods, as the fragment-based solutions will not work to versions prior to this.

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