content: package com.kekstudio.pianochartviewsample;
  
  import android.graphics.Color;
  import android.os.Bundle;
  import android.support.v7.app.AppCompatActivity;
  
  import com.kekstudio.pianochartview.PianoChartView;
  
  public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          PianoChartView pianoChartViewSmall = (PianoChartView) findViewById(R.id.piano_chart_view_small);
          pianoChartViewSmall.setCheckedKeys(new int[]{2,5,3, 8, 11,12});
          pianoChartViewSmall.setSize(PianoChartView.Size.Small);
          pianoChartViewSmall.setLightKeysColor(Color.parseColor("#CFD8DC"));
          pianoChartViewSmall.setDarkKeysColor(Color.parseColor("#607D8B"));
          pianoChartViewSmall.setCheckedKeysColor(Color.parseColor("#B2EBF2"));
  
          PianoChartView pianoChartViewLarge = (PianoChartView) findViewById(R.id.piano_chart_view_large);
          pianoChartViewLarge.setCheckedKeys(new int[]{1,6,20, 9, 16,19});
  
      }
  
  
  
  }
  