Android怎么实现音频波形的动画效果

来源：恒创科技编辑：恒创科技编辑部

2024-04-24 14:47:40

要实现音频波形的动画效果，可以通过Android的AudioTrack类来实现。以下是一个简单的示例代码：

public class WaveformView extends View {

    private byte[] mWaveform;
    private Paint mPaint;

    public WaveformView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mPaint = new Paint();
        mPaint.setColor(Color.RED);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(2);
    }

    public void setWaveform(byte[] waveform) {
        mWaveform = waveform;
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (mWaveform == null) {
            return;
        }

        int width = getWidth();
        int height = getHeight();

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

        for (int i = 0; i < mWaveform.length; i++) {
            float x = i * width / mWaveform.length;
            float y = height / 2 + mWaveform[i] * height / 2 / 128;
            path.lineTo(x, y);
        }

        canvas.drawPath(path, mPaint);
    }
}

在Activity中使用WaveformView并传入音频数据即可看到波形动画效果：

public class MainActivity extends AppCompatActivity {

    private WaveformView mWaveformView;

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

        mWaveformView = findViewById(R.id.waveformView);

        // 传入音频数据
        byte[] waveform = generateWaveform();
        mWaveformView.setWaveform(waveform);
    }

    private byte[] generateWaveform() {
        // 生成音频数据的逻辑，例如解码音频文件、录制音频等
        return new byte[1024];
    }
}