Audiogram

Super lightweight audiowave progressbar written in Kotlin

Getting started

Add to your root build.gradle:

allprojects {
	repositories {
	    ...
	    maven { url "https://jitpack.io" }
	}
}

Add the dependency:

dependencies {
    compile 'com.github.alxrm:audiowave-progressbar:0.9.1'
}

Attrs

attr	format	description
waveColor	color	with this color chunks will be filled
chunkWidth	dimension	every chunk will have this width
chunkHeight	dimension	maximum height all the chunks can be
minChunkHeight	dimension	minimum height all the chunks can be
chunkSpacing	dimension	spacing between chunks
chunkRadius	dimension	how much corners of every chunk will be rounded
progress	float	should be 0..100, it's float so you can easily animate this
animateExpansion	boolean	toggle the animated expansion

Note: If you are going to place this in a RecyclerView item, you have to set animateExpansion to false, otherwise you'll see an incredibly laggy scroll (check out the example)

In code

Settle the wave somewhere in your XML like this:

<rm.com.audiowave.AudioWaveView
    android:id="@+id/wave"
    android:layout_width="match_parent"
    android:layout_height="32dp"
    android:layout_margin="16dp"
    app:animateExpansion="false"
    app:chunkWidth="3dp"
    app:chunkHeight="24dp"
    app:minChunkHeight="2dp"
    app:chunkSpacing="1dp"
    app:chunkRadius="1dp"
    app:waveColor="@android:color/white"
    />

API

Set raw byte array asynchronously

// does downsampling in O(N) and shows the animation you see in a gif above (the inflation-like one)
setRawData(byte[] data);

// you also have the ability to listen, when does the downsampling complete
setRawData(byte[] data, OnSamplingListener callback);

In case you have a scaled byte array you want to draw, i. e. an array whose size is the amount of chunks to draw

// instantly redraws the wave without async downsampling process
setScaledData(byte[] scaledData);

You can use it like a Seekbar, it reacts on touches, just attach listener

wave.setOnProgressListener(OnProgressListener listener);

Note: that setOnProgressListener is a Java style API and with Kotlin you have to set it like this:

wave.onProgressListener = object : OnProgressListener {...}

This listener has 3 methods like a built-in Seekbar

void onStartTracking(float progress) {
  // invokes when user touches the view
}

void onStopTracking(float progress) {
  // invokes when user releases the touch
}

void onProgressChanged(float progress, boolean byUser) {
  // invokes every time the progress's been changed
}

Kotlin users can listen Seekbar event in a more convenient and clean way with properties:

wave.onStopTracking = {
  Log.d("wave", "Progress set: $it")
}

wave.onStartTracking = {
  Log.d("wave", "Started tracking from: $it")
}

wave.onProgressChanged = {progress, byUser ->
  Log.d("wave", "Progress set: $progress, and it's $byUser that user did this")
}

Contribution

There are some features(like better precision) I am about to implement, but a little bit later. If you'd like to help, you are always free to send pull requests or issues if you only want to suggest something

Note: All your pull requests should be written in kotlin

License

MIT License

Copyright (c) 2016 Alexey Derbyshev

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.