WaveformSeekBar

SeekBar variant that shows waveform data

Getting started

Setting up the dependency

First of all, include the library in your project.

1. Add it in your root build.gradle at the end of repositories:

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

2. Add the dependency:

implementation 'com.github.alexei-frolo:WaveformSeekBar:1.1'

WaveformSeekBar example

This section explains how to use WaveformSeekBar.

First, add the view to xml layout:

...

<com.frolo.waveformseekbar.WaveformSeekBar
    android:id="@+id/waveform_seek_bar"
    android:layout_width="match_parent"
    android:layout_gravity="center"
    android:layout_height="100dp"
    android:layout_margin="16dp"/>

...

Then you can set up waveform data and listen to progress changes as shown below:

...
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_waveformseekbar_example);

    final WaveformSeekBar seekBar = findViewById(R.id.waveform_seek_bar);
    seekBar.setOnSeekBarChangeListener(new WaveformSeekBar.Callback() {
        @Override
        public void onProgressChanged(WaveformSeekBar seekBar, float percent, boolean fromUser) {

        }

        @Override
        public void onStartTrackingTouch(WaveformSeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(WaveformSeekBar seekBar) {
            Toast.makeText(
                    WaveformSeekBarExampleActivity.this,
                    "Tracked: percent=" + seekBar.getProgressPercent(),
                    Toast.LENGTH_SHORT).show();
        }
    });
    seekBar.setWaveform(createWaveform(), true);

    findViewById(R.id.btn_regenerate).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            seekBar.setWaveform(createWaveform(), true);
        }
    });
}

private int[] createWaveform() {
    final Random random = new Random(System.currentTimeMillis());

    final int length = 50;
    final int[] values = new int[length];
    int maxValue = 0;

    for (int i = 0; i < length; i++) {
        final int newValue = 5 + random.nextInt(50);
        if (newValue > maxValue) {
            maxValue = newValue;
        }
        values[i] = newValue;
    }
    return values;
}
...