Android将自定义View保存为Bitmap图片

 private void createPdfImg() {//创建待分享的viewView view = LayoutInflater.from(getContext()).inflate(R.layout.ecg_pdf_view, null);PdfEcgWaveView waveView = view.findViewById(R.id.ecg_wave_view2);PdfEcgWaveView.DATA_PRE_SECOND = sampleRate;getAndSavePdfImg(view, waveView, 1);}int page;// 分页private void getAndSavePdfImg(View view, PdfEcgWaveView waveView, int i) {waveView.setGain(gain);waveView.setPagerSpeed(paperSpeed + 1);Log.d("列表大小", ecgWaveList.size() + "");//采样率是512个数据/秒,我们取8秒生成一张图，从而得到512*8=4096int dataSize = sampleRate * 8;page = (int) Math.ceil((double) ecgWaveList.size() / dataSize);List<Float> pdfItem = new ArrayList<>();for (int j = 0; j < page; j++) {pdfItem.clear();for (int k = j * dataSize; k < dataSize + dataSize * j; k++) {if (k < ecgWaveList.size()) {pdfItem.add(ecgWaveList.get(k));}}waveView.preparePoints(pdfItem);layoutView(view, waveView, pdfItem);getAndSaveBitmap(view, j);}Log.d("ecgsize", ecgWaveList.size() + "");}protected void layoutView(View v, PdfEcgWaveView waveView, List<Float> ecgItem) {int a = (int) (sampleRate * 8 * ecgWaveView.getDataSpacing());Log.d("viewSize", ecgItem.size() + "");Log.e("bitmap", "a=" + a + "-dataSpacing=" + ecgWaveView.getDataSpacing() + "-sampleRate=" + sampleRate);v.layout(0, 0, a, SizeUtils.dp2px(180));int measuredWidth = View.MeasureSpec.makeMeasureSpec(a, View.MeasureSpec.EXACTLY);int measuredHeight = View.MeasureSpec.makeMeasureSpec(SizeUtils.dp2px(180), View.MeasureSpec.EXACTLY);v.measure(measuredWidth, measuredHeight);v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());}/*** 创建和保存bitmap*/protected void getAndSaveBitmap(View v, int i) {Log.e("bitmap","width="+v.getWidth()+"height="+v.getHeight());Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(),Bitmap.Config.ARGB_8888);// 利用bitmap生成画布Canvas canvas = new Canvas(bitmap);// 把view中的内容绘制在画布上v.draw(canvas);saveBitmap(bitmap, i);}/*** 保存并压缩图片** @param bitmap*/public void saveBitmap(Bitmap bitmap, int i) {Log.d("hehe", "保存图片");singleThreadExecutor.execute(new Runnable() {@Overridepublic void run() {String path = Constants.PDF_IMG_ROTE_PATH + "/img" + i + ".png";File file = new File(path);try {FileOutputStream stream = new FileOutputStream(file);//压缩图片bitmap.compress(Bitmap.CompressFormat.JPEG, 80, stream);//释放资源stream.flush();stream.close();} catch (Exception e) {disProgressDialog();ToastUtil.showLongToast(StringUtils.getString(R.string.failed_report));Log.d("hehe", e.getLocalizedMessage());}}});}

exg_pdf_view.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:background="@color/write"android:layout_height="@dimen/dp_200"><com.kl.commonbase.views.ecg.EcgBackgroundViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:background="@color/write"app:largeGridColor="#ff0022"app:smallGridColor="#ff0033" /><com.kl.commonbase.views.ecg.PdfEcgWaveViewandroid:id="@+id/ecg_wave_view2"android:layout_width="wrap_content"android:layout_height="@dimen/dp_200"app:scrollable="true"app:waveColor="@color/black"app:waveStrokeWidth="@dimen/dp_1" />
</FrameLayout>