以下是修改的一段画录音波形图的代码,数据是jni层录音返回的一个byte数组,在录音的时候,只是画了一小段波形就不再继续,不知道哪里出现了问题
class RecordTask extends AsyncTask {
private int recBufSize;
private byte[] pcmData;
private SurfaceView sfv;// 画板
private Paint mPaint;// 画笔
public RecordTask(byte[] pcmData, int recBufSize, SurfaceView sfv,
Paint mPaint) {
this.pcmData = pcmData;
this.recBufSize = recBufSize;
this.sfv = sfv;
this.mPaint = mPaint;
}
@Override
protected Object doInBackground(Object... params) {
try {
byte[] buffer = new byte[1764];
ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(
pcmData);
while (isRecording) {
int readsize = arrayInputStream.read(buffer,0,1764);
synchronized (inBuf) {
// 添加数据
int len = readsize / rateX;
for (int i = 0; i < len; i += rateX) {
inBuf.add((short) ((0x0000 | buffer[i + 1]) << 8 | buffer[i]));
}
}
publishProgress();
}
} catch (Throwable t) {
}
return null;
}
@Override
protected void onProgressUpdate(Object... values) {
long time = new Date().getTime();
if (time - c_time >= draw_time) {
c_time = new Date().getTime();
SimpleDraw(inBuf, baseLine);
}
super.onProgressUpdate(values);
}
void SimpleDraw(ArrayList<Short> inBuf, int baseLine) {
if (rateY == 0) {
rateY = 50000 / sfv.getHeight();
baseLine = sfv.getHeight() / 2;
}
Canvas canvas = sfv.getHolder().lockCanvas(
new Rect(0, 0, sfv.getWidth(), sfv.getHeight()));// 关键:获取画布
canvas.drawColor(Color.BLACK);// 清除背景
int start = sfv.getWidth() - inBuf.size() * divider;
int py = baseLine;
if (inBuf.size() > 0)
py += inBuf.get(0) / rateY;
int y;
canvas.drawLine(0, baseLine, start - divider, baseLine, mPaint);
for (int i = 0; i < inBuf.size(); i++) {
y = inBuf.get(i) / rateY + baseLine;// 调节缩小比例,调节基准线
canvas.drawLine(start + (i - 1) * divider, py, start + i
* divider, y, mPaint);
py = y;
}
sfv.getHolder().unlockCanvasAndPost(canvas);// 解锁画布,提交画好的图像
}
}