penpan85 / voiceripple

Voice Record Button that has ripple effect with users voice

VoiceRipple

About

Voice Record Button that has ripple effect with users voice. Calculation of decibels from max amplitude by using the following:

power_db = 20 * log10(amp / amp_ref)

Main method consists the following:

if (THRESHOLD >= 0) {
  if (rippleRadius - THRESHOLD >= powerDb + MIN_RADIUS || powerDb + MIN_RADIUS >= rippleRadius + THRESHOLD) {
    rippleRadius = powerDb + MIN_RADIUS;
    backgroundRadius = (int) (rippleRadius * backgroundRippleRatio);
  } else {
    // if decreasing velocity reached 0, it should simply match with ripple radius
    if (((backgroundRadius - rippleRadius) / rippleDecayRate) == 0) {
      backgroundRadius = rippleRadius;
    } else {
      backgroundRadius = backgroundRadius - ((backgroundRadius - rippleRadius) / rippleDecayRate);
    }
  }

  invalidate();
}

The approximated decibel power of the sound is used to animate the button's ripple effect.

Demo

Implement

repositories {
  jcenter()
}

dependencies {
  compile "info.kimjihyok:voice-ripple-record-button:${voice-ripple-button-version}"
}

XML Setup

<info.kimjihyok.ripplelibrary.VoiceRippleView
    android:id="@+id/voice_ripple_view"
    android:layout_width="200dp"
    android:layout_height="200dp"
    app:rippleColor="@color/colorPrimary"/>

Setter for view and android recorder related setup

voiceRipple = (VoiceRippleView) findViewById(R.id.voice_ripple_view);

// set view related settings for ripple view
voiceRipple.setRippleColor(ContextCompat.getColor(this, R.color.colorPrimary));
voiceRipple.setRippleSampleRate(Rate.LOW);
voiceRipple.setRippleDecayRate(Rate.HIGH);
voiceRipple.setBackgroundRippleRatio(1.4);

// set recorder related settings for ripple view
voiceRipple.setMediaRecorder(new MediaRecorder());
voiceRipple.setOutputFile(audioFile.getAbsolutePath());
voiceRipple.setAudioSource(MediaRecorder.AudioSource.MIC);
voiceRipple.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
voiceRipple.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

Setter for recording status related setup

// set inner icon for record and recording
voiceRipple.setRecordDrawable(ContextCompat.getDrawable(this, R.drawable.record), ContextCompat.getDrawable(this, R.drawable.recording));
voiceRipple.setIconSize(30);

// change recording status when clicked
voiceRipple.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
   if (voiceRipple.isRecording()) {
      voiceRipple.stopRecording();
    } else {
      try {
        voiceRipple.startRecording();
      } catch (IOException e) {
        Log.e(TAG, "startRecording() error: ", e);
      }
    }
  }
});

Stop and Destory

// It is required to stop VoiceRippleView at onStop and to destory at onDestory to prevent memory leak and unexpected
@Override
protected void onStop() {
  super.onStop();
  voiceRipple.onStop();
}
 
@Override
protected void onDestroy() {
  super.onDestroy();
  voiceRipple.onDestroy();
}