Embed custom voice with user voice in system active call in android - android

I have got all call states through this refrence
but now i want to add my custom voice from my app in user active call with user voice.
can android gives me such a permission to do so ?
if android OS gives permission then how can i embed my voice (can be mp3 or something) with user voice.
Please help me in this scenerio.

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Android Voice Interaction

I have referred this for providing voice interaction in my app.
I followed the same step but still not able to open my app using voice command for example: Find pizza in my app.
As I am not able to open the App by voice command isVoiceInteraction() is always false.
Please help if anybody has successfully implemented voice interaction.

Unable to access microphone when another app is using it in Android

I'm using code from the following URL in order to get sound data from the microphone with AudioRecord:
http://www.dreamincode.net/forums/topic/303235-visualizing-sound-from-the-microphone/
The problem I'm seeing is that if another app is also using the microphone, I'm getting an error (status -3) from AudioRecord. Everything works as expected if I kill the other app which is using the microphone. Is there an elegant solution to allow my app to access the microphone even if another app is already using it?
Thank you.
Sadly, only one app at a time can access the microphone (just like the camera).
Also, there is no standard way to inform another app that you want access to the microphone (so that they release the resources and let you access it). You could however send a broadcast to all other apps ("requesting the microphone"), but the other apps would have to implement this feature (and very few or zero developers will do this).
I would recommend you to simply inform the user that the microphone is currently not available, because you can't do anything else.
If you are using the "OK Google" function with the option to access it from any page, try turning that off (the 'any page' bit From Google app screen MENU>SETTINGS>VOICE>"OK GOOGLE DETECTION">FROM ANY SCREEN=OFF): it hijacks the microphone, or can do.

What permissions are needed to programmatically mute a phone call, from a background app?

I have an Android app that happens to be running in the background on the user's Android phone, while the user is speaking on a phone call that someone placed to the user. At a certain point, my app would like to silence the audio from the phone call and play its own audio. Moreover, I'd like to do this without disrupting the user's speech.
What permission does my app need to have, to do this? Is there any permission that's available to third-party apps that is sufficient to let my app do this?
It looks like AudioManager.setStreamMute(STREAM_VOICE_CALL, true) will mute the audio output from the voice call. But I can't tell what permission this needs: it's not listed in the Android API documentation, or in the Pscout permission map. Also, I can't tell if there any restrictions on using this API from an app running in the background, on any version of Android.
(If the problem statement wasn't clear: Alice has installed my app on her phone. Bob calls Alice. Alice picks up the call and is talking to Bob. At a certain point, my app wants to completely mute Bob's voice and play its own audio clip instead, so Alice hears the audio clip instead of anything that Bob says. But, I don't want to turn off the microphone on Alice's phone: if Alice is saying anything, that should still be picked up over the call and Bob should still hear it on the phone call.)
You can try: android.permission.MODIFY_AUDIO_SETTINGS.

Android: How to detect when a user stops talking into the microphone

I have an Android application that begins recording from the microphone when the application starts. In my current version, the user must press a STOP button to stop recording.
How do I detect that the user has stopped talking and use that to trigger the recorder to stop?
Similar to what is implemented in the Speech Recognition functionality in Android. The user stops talking and then the speech is translated. I have seen other apps that do it, like Talking Tom type apps.
As a side note I would also love to show some type of visual indicating that the microphone is receiving sound. Something to show the sound level coming in.
Any help appreciated.
An approach is to use threads on recording and the speech power analyzing process on the recorded bytes,
there's a sample code for your reference: http://musicg.googlecode.com/files/musicg_android_demo.zip
What are you using to record audio? This may provide some clues:
android.media.MediaRecorder:
the constant MEDIA_RECORDER_INFO_MAX_DURATION_REACHED can be used with an onInfoListener.
android.speech.SpeechRecognizer:
attach a RecognitionListener and call onEndofSpeech().

Voice recognition APIs, will Google Voice do this?

I've got an idea for an android app, I want to be able to say commands and have the application listen out for these and perform some action.
For example, I want my app to sit idle and listen for my voice, when it hears me say "start", the app will start doing something until I say "stop".
The idea is to lay the phone down and not have to physically touch it in order to control my app.
Would this be possible with any current APIs? If so which ones should I look into?
You can take a look at the Google voice commands.
http://www.google.com/mobile/voice-actions/
Alternatively, if you want to customise your application, you can use the google voice service and write an activity that will invoke the voice service and return you the result.
Check out the below link for the sample application.
http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/VoiceRecognition.html

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