</p> Demo :https://github.com/CarGuo/RecordWave
先看看效果┑( ̄Д  ̄)┍
2
1
</p>
···
try {
mAudioRecord.startRecording();
} catch (Exception ex) {
ex.printStackTrace();
}
···
while (mIsRecording) {
int readSize = mAudioRecord.read(mPCMBuffer, 0, mBufferSize);
if (readSize == AudioRecord.ERROR_INVALID_OPERATION ||
readSize == AudioRecord.ERROR_BAD_VALUE) {
if (errorHandler != null && !sendError) {
sendError = true;
errorHandler.sendEmptyMessage(ERROR_TYPE);
mIsRecording = false;
isError = true;
}
} else {
if (readSize > 0) {
mEncodeThread.addTask(mPCMBuffer, readSize);
calculateRealVolume(mPCMBuffer, readSize);
sendData(mPCMBuffer, readSize);
} else {
if (errorHandler != null && !sendError) {
sendError = true;
errorHandler.sendEmptyMessage(ERROR_TYPE);
mIsRecording = false;
isError = true;
}
}
}
}
private void sendData(short[] shorts, int readSize) {
if (dataList != null) {
int length = readSize / 300;
short resultMax = 0, resultMin = 0;
for (short i = 0, k = 0; i < length; i++, k += 300) {
for (short j = k, max = 0, min = 1000; j < k + 300; j++) {
if (shorts[j] > max) {
max = shorts[j];
resultMax = max;
} else if (shorts[j] < min) {
min = shorts[j];
resultMin = min;
}
}
if (dataList.size() > maxSize) {
dataList.remove(0);
}
dataList.add(resultMax);
}
}
}
</p> 1、首先,你得有一个女····呸呸呸,你要有一个View,自定义一个View用来绘制,绘制的逻辑有这么几个:
是不是很简单呢?是啊~确实很简单( ̄o ̄) .那到这里就结束88咯。
咦,下面还有啊 (ˉ▽ ̄~) 切~~
@Override
protected void onVisibilityChanged(@NonNull View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
if (visibility == VISIBLE && mBackgroundBitmap == null) {
ViewTreeObserver vto = getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
if (getWidth() > 0 && getHeight() > 0) {
mWidthSpecSize = getWidth();
mHeightSpecSize = getHeight();
mBaseLine = mHeightSpecSize / 2;
mBackgroundBitmap = Bitmap.createBitmap(mWidthSpecSize, mHeightSpecSize, Bitmap.Config.ARGB_8888);
mBitmap = Bitmap.createBitmap(mWidthSpecSize, mHeightSpecSize, Bitmap.Config.ARGB_8888);
mBackCanVans.setBitmap(mBackgroundBitmap);
mCanvas.setBitmap(mBitmap);
ViewTreeObserver vto = getViewTreeObserver();
vto.removeOnPreDrawListener(this);
}
return true;
}
});
}
}
/**
* 根据当前块数据来判断缩放音频显示的比例
*
* @param list 音频数据
*/
private void resolveToWaveData(ArrayList<Short> list) {
short allMax = 0;
for (Short sh : list) {
if (sh > allMax) {
allMax = sh;
}
}
int curScale = allMax / mBaseLine;
if (curScale > mScale) {
mScale = ((curScale == 0) ? 1 : curScale);
}
}
首先把bitmap洗干净drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);,然后绘制基线,接着就是for循环绘制音频线了。 绘制以基线为轴,每个音频数据除以缩放系数(需要考虑乘的情况?反正我bu care~),然后绘制上下的竖线,之后把这个bitmap绘制到要完整显示的mBackgroundBitmap,最后通知界面更新(发到UI线程),然后界面把要显示的mBackgroundBitmap贴出来。
if (mBackCanVans != null) {
//洗白白
mBackCanVans.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
mBackCanVans.drawLine(0, mBaseLine, mWidthSpecSize, mBaseLine, mPaint);
int drawBufsize = dataList.size();
//判断大小,是否改变显示的比例
for (int i = 0, j = 0; i < drawBufsize; i++, j += mOffset) {
Short sh = dataList.get(i);
short max = (short) (mBaseLine - sh / mScale);
short min;
if (mWaveCount == 2) {
min = (short) (sh / mScale + mBaseLine);
} else {
min = (short) (mBaseLine);
}
mBackCanVans.drawLine(j, mBaseLine, j, max, mPaint);
mBackCanVans.drawLine(j, min, j, mBaseLine, mPaint);
}
synchronized (mLock) {
mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
mCanvas.drawBitmap(mBackgroundBitmap, 0, 0, mPaint);
}
Message msg = new Message();
msg.what = 0;
handler.sendMessage(msg);
}
···
@Override
protected void onDraw(Canvas c) {
super.onDraw(c);
if (mIsDraw && mBitmap != null) {
synchronized (mLock) {
c.drawBitmap(mBitmap, 0, 0, mViewPaint);
}
}
}
</p>
最后~欢迎来个人的<a href="https://github.com/CarGuo">Github</a>
一定要来哈