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Can I use audio file for offline Speech to text in android studio?

I am successfully able to run offline speech to text model in android studio by using SpeechRecognizer and RecognizerIntent classes. But my problem is, I first want to record audio, do some post-processing on audio file and then I want speech to text results by passing that audio file.
Note: I do not want to use any cloud based speech to text service.

Continuous speech recognition in android app without google popup

I am working on a project on "Home Automation" system with Android app and Microcontroller , connecting them through Bluetooth module. I have incorporated "speech to text" for voice commands. Although , it works well with the built-in google speech recognition api. All I need is a continuous speech recognition and without the google voice pop-up.
I have seen a similar app on playstore "speechnotes" that works exactly i wish to develop. And it works totally offline.

You should try Droid Speech it supports continuous voice recognition and also will work offline if the speech package for the required language is installed in the device.
Setting the library in your project is very simple and with a few lines of code you can easily start using speech recognition.
An example,
Add the below in your Gradle file,
compile 'com.github.vikramezhil:DroidSpeech:v2.0.3’
In your Activity,
DroidSpeech droidSpeech = new DroidSpeech(this, null);
droidSpeech.setOnDroidSpeechListener(this);
To start droid speech to listen to user voice call the method,
droidSpeech.startDroidSpeechRecognition();
The speech result will be triggered at,
#Override
public void onDroidSpeechFinalResult(String finalSpeechResult)
{
// Do whatever you want with the speech result
}

SpeechRecognition API: How to get the voice features (MEL Coefficients)

I was going to implement a speaker verification app for Android, and was wondering if there would be a way to get the voice features (MEL Coefficients) from the Android's Speech Recognition module?
Please note that speaker verification is slightly different than speech recognition, so that's why I'm not using the speech recognition directly.

No, you can not compute MFCC from audio stream with Android API. You can use external library for that, for example CMUSphinx
You can also try existing Java-only libraries for voice verification for Android like
Recognito

Speech to Text: Play MP3 message by itself and retrieve words

I have few MP3 files which are speeches. I have used Android Speech to Text before so I know it can store spoken words. Is there any way where we can get the spoken words from the MP3 and display it in a EditText ?
I am thinking about playing the MP3 silently and identify the words, but have no idea about how to do that. I am using Google Speech Engine.

There is no native way to convert an audio file that contains spoken words to text on Android. You'll need to use a third-party API to do this, such as.
A&T
Nuance
iSpeech
And perhaps Pocket Sphinx, although you may have to write the file input stream side of it yourself.
If you're not concerned about breaking terms and conditions, you could use the Chrome Speech API.

Api for waveTable synthesis on android

Could anyone tell me, Where can i find api for waveTable syntesis on android?
Or maybe i can use one of C++ waveTable synth libraries on android through JNI?
MediaPlayer and JetPlayer does not fit for this task.
I need to play MIDI, but with good soundbanks and be able to change soundbanks on user request.

AFAIR there's no API for this in SDK. If you want to play midi on android use MediaPlayer to do the playback (it does support midi files)