Android Open Source - rfcx-client-stream-android Visualizer View

• Back to Sound/stream  ↑

From Project

Back to project page rfcx-client-stream-android.

License

The source code is released under:

Apache License

Java Source Code

package org.rfcx.android.stream.view;
//from  w w  w  . j a  v a 2  s .c  om
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by Natthawut Hemathulin on 12/16/14 AD.
 * Email: natthawut1991@gmail.com
 */
public class VisualizerView extends View {

    private static final boolean ANTI_ALIAS = true;
    private static final float STROKE_WIDTH = 2f;
    private static final int WAVE_WIDTH = 4;
    private static final int STROKE_COLOR = Color.parseColor("#FFFFFF");

    private byte[] mBytes;
    private float[] mPoints;
    private Rect mRect = new Rect();

    private Paint mForePaint = new Paint();

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

    public VisualizerView(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        init();
    }

    private void init() {
        mBytes = null;

        mForePaint.setStrokeWidth(STROKE_WIDTH);                  // Stroke width
        mForePaint.setAntiAlias(ANTI_ALIAS);
        mForePaint.setColor(STROKE_COLOR);  // Path color
    }

    public void updateVisualizer(byte[] bytes) {
        mBytes = bytes;
        invalidate();
    }

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

        if (mBytes == null) {
            return;
        }

        if (mPoints == null || mPoints.length < mBytes.length * 4) {
            mPoints = new float[mBytes.length * 4];
        }

        mRect.set(0, 0, getWidth(), getHeight());

        for (int i = 0; i < mBytes.length - 1; i++) {
            mPoints[i * WAVE_WIDTH] = mRect.width() * i / (mBytes.length - 1);
            mPoints[i * WAVE_WIDTH + 1] = mRect.height() / 2
                    + ((byte) (mBytes[i] + 128)) * (mRect.height() / 2) / 128;
            mPoints[i * WAVE_WIDTH + 2] = mRect.width() * (i + 1) / (mBytes.length - 1);
            mPoints[i * WAVE_WIDTH + 3] = mRect.height() / 2
                    + ((byte) (mBytes[i + 1] + 128)) * (mRect.height() / 2) / 128;
        }

        canvas.drawLines(mPoints, mForePaint);
    }
}

Java Source Code List

• Back to Sound/stream  ↑