I have created a simple android app for controlling a relay connected to my Raspberry Pi. I have used buttons as well as basic voice recognition to trigger those buttons and switch on/off the corresponding relay channel.
As of now the voice recognition part is handled by a RecognizerIntent, wherein I need to press a button on my app to open a Google voice prompt which listens to my voice command and activates/deactivates the corresponding button which controls the relay switches.
I want to do the same with continuous voice recognition which allows the app to continuously listen to my commands without the user having to press a button on the app, hence allowing hands-free operation.
Here is my existing code, a very simple means of voice recognition which will allow me to switch on and off the buttons for various devices connected to the relay:
public void micclick(View view) {
if(view.getId()==R.id.mic)
{promptSpeechInput();}
}
private void promptSpeechInput() {
Intent i= new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
i.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
i.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
i.putExtra(RecognizerIntent.EXTRA_PROMPT,"Speak!");
try{
startActivityForResult(i,100);
}
catch (ActivityNotFoundException a)
{
Toast.makeText(MainActivity.this,"Sorry your device doesn't support",Toast.LENGTH_SHORT).show();
}
}
public void onActivityResult(int requestCode, int resultCode, Intent i) {
super.onActivityResult(requestCode, resultCode, i);
String voicetxt;
switch (requestCode) {
case 100:
if (resultCode == RESULT_OK && i != null) {
ArrayList<String> result2 = i.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
voicetxt = result2.get(0);
if (voicetxt.equals("fan on")) {
StringBuffer result=new StringBuffer();
toggleButton1.setChecked(true);
result.append("Fan: ").append(toggleButton1.getText());
sc.onRelayNumber="a";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("fan of")) {
StringBuffer result=new StringBuffer();
toggleButton1.setChecked(false);
result.append("Fan: ").append(toggleButton1.getText());
sc.onRelayNumber = "a_off";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("light on")) {
StringBuffer result=new StringBuffer();
toggleButton2.setChecked(true);
result.append("Light: ").append(toggleButton2.getText());
sc.onRelayNumber = "b";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("light off")) {
StringBuffer result=new StringBuffer();
toggleButton2.setChecked(false);
result.append("Light: ").append(toggleButton2.getText());
sc.onRelayNumber = "b_off";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("air conditioner on")) {
StringBuffer result=new StringBuffer();
toggleButton3.setChecked(true);
result.append("AC: ").append(toggleButton3.getText());
sc.onRelayNumber = "c";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("air conditioner of")) {
StringBuffer result=new StringBuffer();
toggleButton3.setChecked(false);
result.append("AC: ").append(toggleButton3.getText());
sc.onRelayNumber = "c_off";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("heater on")) {
StringBuffer result=new StringBuffer();
toggleButton4.setChecked(true);
result.append("Heater: ").append(toggleButton4.getText());
sc.onRelayNumber = "d";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
if (voicetxt.equals("heater off")) {
StringBuffer result=new StringBuffer();
toggleButton4.setChecked(false);
result.append("Heater: ").append(toggleButton4.getText());
sc.onRelayNumber = "d_off";
new Thread(sc).start();
Toast.makeText(MainActivity.this, result.toString(),Toast.LENGTH_SHORT).show();
}
}
break;
}
}
I want to achieve the same functionality without having to press the button. Please note that I am new to Android app development. If possible, please be descriptive in the usage of external libraries, if they are required because I don't think continuous recognition is possible with Google's RecognizerIntent. I have speculated that I might need to include libraries like CMUSphinx, but I am not sure how to go about it.
