在android中有效地绘制正弦波

public class SineWaveView extends View {
    private Paint paint;

    public SineWaveView(Context context) {
        super(context);
        init();
    }

    public SineWaveView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        paint = new Paint();
        paint.setColor(Color.RED);
        paint.setStrokeWidth(5);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        int width = getWidth();
        int height = getHeight();
        int amplitude = height / 4;
        int frequency = 10;

        Path path = new Path();
        path.moveTo(0, height / 2);

        for (int i = 0; i < width; i++) {
            float x = i;
            float y = (float) (height / 2 + amplitude * Math.sin(2 * Math.PI * i / frequency));
            path.lineTo(x, y);
        }

        canvas.drawPath(path, paint);
    }
}

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SineWaveView sineWaveView = new SineWaveView(this);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.MATCH_PARENT);
        sineWaveView.setLayoutParams(layoutParams);

        LinearLayout container = findViewById(R.id.container);
        container.addView(sineWaveView);
    }
}