自定义波形图View，LayoutInflater动态加载控件保存为本地图片

效果图：

页面布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="@dimen/dp_145"xmlns:app="http://schemas.android.com/apk/res-auto"android:background="@color/white"><TextViewandroid:id="@+id/tv_index"android:layout_width="@dimen/dp_30"android:layout_height="match_parent"android:layout_gravity="center"android:background="@color/common_btn_clicked"android:gravity="center"android:textColor="@color/white"android:textSize="@dimen/sp_14"tools:text="TH"/><RelativeLayoutandroid:id="@+id/rl_wave_view"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@color/white"><com.kl.common_base.view.wave.GridViewandroid:layout_width="match_parent"android:layout_height="match_parent"app:bgColor="#f0d3a9"/><com.kl.common_base.view.wave.PdfEcgWaveViewandroid:id="@+id/wave_view"android:layout_width="match_parent"android:layout_height="match_parent"android:visibility="visible" /><TextViewandroid:id="@+id/tv_file_create_date"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="@dimen/dp_20"android:layout_marginTop="@dimen/dp_10"android:text=""android:textColor="@color/colorPrimary"android:textSize="@dimen/sp_12"tools:text="2019年6月26日11:54" /></RelativeLayout>
</LinearLayout>

自定义波形图控件：

package com.kl.common_base.view.wave;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;import com.kl.common_base.R;
import com.kl.common_base.utils.SizeUtils;import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;public class PdfEcgWaveView extends View {private List<Short> pointList = Collections.synchronizedList(new LinkedList<>());private Paint mPaint;private Paint mPaintLine;private int mWidth = 0;private int mHeight = 0;private int mCenterY = 0;public float points[];List<Short> nativeDatas = null;private int len = 0;private int index = 0;private int zoom;private float gapX = 0.2f;private int xSize = 0;private final int maxMillimeter = 25;private final int FILTER_SIZE = 50;private int sampleRate = 8000 / FILTER_SIZE;private int gain = 5;private final int maxMidScopeY = 0;private double screenTotalTime;private int[] lineArray = new int[]{7321, 8521, 9600, 10875};private Map<Integer, Integer> lineMap = new HashMap();
//    private List<Float> xList = new ArrayList<>();public PdfEcgWaveView(Context context) {super(context);Log.d("caowj", "55555555555555555555555555");initPaint();}public PdfEcgWaveView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);Log.d("caowj", "66666666666666666666666666");initPaint();}public PdfEcgWaveView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);Log.d("caowj", "77777777777777777777777777");initPaint();}private void initPaint() {Log.d("caowj", "initPaint--------------");if (mPaint == null) {mPaint = new Paint();mPaint.setColor(Color.BLACK);mPaint.setAntiAlias(true);mPaint.setStrokeWidth(2);mPaint.setStrokeCap(Paint.Cap.ROUND);mPaint.setStyle(Paint.Style.STROKE);}if (mPaintLine == null) {mPaintLine = new Paint();mPaintLine.setColor(getContext().getResources().getColor(R.color.red));mPaintLine.setAntiAlias(true);mPaintLine.setStrokeWidth(2);mPaintLine.setStrokeCap(Paint.Cap.ROUND);mPaintLine.setStyle(Paint.Style.STROKE);}}@Overrideprotected void onSizeChanged(int width, int height, int oldw, int oldh) {mHeight = getHeight();mCenterY = mHeight / 2;mWidth = getWidth();
//        Log.d("caowj", "onSizeChanged--------------"+mWidth+",,,"+mHeight+",,,"+mCenterY);zoom = height / maxMillimeter;
//        double speed = 0.04;double speed = (double) 2 / ((double) width / zoom);Log.e("caowj", "speed=" + speed);screenTotalTime = width / zoom * speed;gapX = (float) (this.mWidth / (sampleRate * screenTotalTime));xSize = Math.round(this.mWidth / gapX);points = new float[xSize * 4];Log.e("caowj", "初始化计算：zoom=" + zoom + ",screenTotalTime=" + screenTotalTime + ",gapX=" + gapX + ",widthSize=" + xSize);super.onSizeChanged(width, height, oldw, oldh);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {Log.d("caowj", "onMeasure--------------" + widthMeasureSpec + ",,," + heightMeasureSpec + ",,," + mCenterY);super.onMeasure(widthMeasureSpec, heightMeasureSpec);}@Overrideprotected void onDraw(Canvas canvas) {Log.w("caowj", "onDraw-----------" + pointList.size());len = pointList.size();if (len >= 2) {index = xSize - len;
//            Log.d("caowj", "drawCube  len=" + len + ",widthSize=" + widthSize + ",index=" + index);for (int i = index + 1; i < xSize; i++) {float startX = (i - 1) * gapX;int mIndex = i - index - 1;points[i * 4] = startX;points[i * 4 + 1] = pointList.get(mIndex);points[i * 4 + 2] = i * gapX;points[i * 4 + 3] = pointList.get(i - index);if (lineMap.containsKey(mIndex)) {Log.w("caowj", "找到需要绘制竖线的位置了：" + startX);
//                    xList.add(startX);int padding = SizeUtils.dp2px(getResources().getDimension(R.dimen.dp_25));canvas.drawLine(startX, padding, startX, mCenterY * 2 - padding, mPaintLine);}}}canvas.drawLines(points, mPaint);super.onDraw(canvas);}public void addWaveDataInVisiable(short[] waveData) {if (nativeDatas == null) {nativeDatas = new ArrayList<>();}for (int i = 0; i < waveData.length; i++) {short y = (short) Math.floor(calcRealMv(maxMidScopeY - waveData[i]) * gain * zoom + mCenterY);nativeDatas.add(y);
//            Log.e("caowj", "y=" + y);}Log.e("caowj", "nativeDatas 长度=" + nativeDatas.size());if (nativeDatas.size() >= 800) {addPointThreadExecutor(nativeDatas);nativeDatas = new ArrayList<>();}}private void addPointThreadExecutor(List<Short> nativeDatas) {if (nativeDatas == null) {return;}List<Short> dataList = nativeDatas;synchronized (pointList) {for (int i = 0; i < dataList.size(); i += FILTER_SIZE) {if (pointList.size() >= xSize && xSize > 0) {pointList.remove(0);}pointList.add(dataList.get(i));for (int linePosition : lineArray) {if (linePosition > i - FILTER_SIZE && linePosition <= i) {lineMap.put(pointList.size(), linePosition);}}}}}public void clear() {if (pointList != null) {pointList.clear();}if (nativeDatas != null) {nativeDatas.clear();}points = new float[xSize * 4];postInvalidate();}/*** mintti  计算真实毫伏值** @param point* @return*/private float calcRealMv(int point) {return (float) (point * 3.3 / 32767);
//        int magnification = 1000;//TODO 放大倍数
//        return (float) (point / magnification * 3.3 / 32767 * 1000);}
}

 public static void createWaveImage(Context context, ViewGroup parentView, AudioFile audioFile, String parentDir, String fileName, int index, boolean isLast) {Log.w("caowj", "createWaveImage");View rootView = LayoutInflater.from(context).inflate(R.layout.item_wave_view, null);PdfEcgWaveView waveView = rootView.findViewById(R.id.wave_view);TextView tvTitle = rootView.findViewById(R.id.tv_file_create_date);TextView tvIndex = rootView.findViewById(R.id.tv_index);tvIndex.setText("TL");String[] arr = fileName.split("\\.");String imageName = arr[0] + "(" + index + ")";String imgTitle = "";if (arr[0].startsWith("0_")) {imgTitle = StringUtils.getPositionAiResult(fileName);}if (TextUtils.isEmpty(imgTitle)) {imgTitle = imageName;}tvTitle.setText(imgTitle);int width = SizeUtils.getScreenWidth() * 2 / 3;int height = SizeUtils.dp2px(context.getResources().getDimension(R.dimen.dp_145));layoutView(rootView, width, height);audioFile.refreshPcmDataByPosition(index, 8000 * 2);waveView.addWaveDataInVisiable(audioFile.getData().clone());Bitmap bitmap = Bitmap.createBitmap(width, height, 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rootView.draw(canvas);// 触发draw()new Thread(new Runnable() {@Overridepublic void run() {Log.d("caowj", "生成Bitmap");boolean result = FileUtils.saveWaveBitmap(bitmap, parentDir, imageName + ".jpg");}}).start();}protected static void layoutView(View v, int w, int h) {v.layout(0, 0, w, h);int measuredWidth = View.MeasureSpec.makeMeasureSpec(w, View.MeasureSpec.EXACTLY);int measuredHeight = View.MeasureSpec.makeMeasureSpec(h, View.MeasureSpec.EXACTLY);v.measure(measuredWidth, measuredHeight);Log.w("caowj", measuredWidth + "--" + measuredHeight + ";;;" + v.getMeasuredWidth() + "---" + v.getMeasuredHeight());v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());}