基于MediaPipe的手势识别 --安卓部分

mediapipe网址：可能会有点儿慢
https://google.github.io/mediapipe/solutions/hands.html#static_image_mode

简单介绍一下mediaPipe，他就是一个集成好的包括人脸关键位点识别、身体关键位点识别、手部关键位点识别的一个包或者库，直接调用就能够得到它的关键位点信息，以手部关键位点为例子：

通过检测人手部得到21个点的一个列表如下

[[x0,y0,z0],[x1,y1,z1],…,[x20,y20,z20]] 这么一个列表

x ,y z 分别表示三维空间坐标上的值，这里检测到我们的手以后还会通过二维空间到三维空间做一个映射关系(我不太会)
大概是这样子：

正式部分：
这个网址最下面官网给了一个案例关于安卓的，但是只能用来检测手势
https://google.github.io/mediapipe/solutions/hands.html#static_image_mode
检测了以后我们还需要如何使用检测结果做其他处理之类的事情
这里介绍检测结果在哪个位置，怎么改代码
用Android studio打开，主要用到的是这三个类

HandsResultImageView.java
处理单张图像
HandsResultGlRenderer.java
处理视频

HandsResultImageView

HandsResult result 是手势检测结果的参数
输入一张图片，进行检测，检测完成会调用setHandsResult这个函数
对结果进行处理。因此我们需要在这个函数里面添加我们的处理结果就可

public void setHandsResult(HandsResult result) {//        这里接收手势检测的结果if (result == null) {return;}//Bitmap bmInput = result.inputBitmap();int width = bmInput.getWidth();int height = bmInput.getHeight();latest = Bitmap.createBitmap(width, height, bmInput.getConfig());Canvas canvas = new Canvas(latest);canvas.drawBitmap(bmInput, new Matrix(), null);
//        检测到手的数量int numHands = result.multiHandLandmarks().size();for (int i = 0; i < numHands; ++i) {drawLandmarksOnCanvas(result.multiHandLandmarks().get(i).getLandmarkList(),result.multiHandedness().get(i).getLabel().equals("Left"),canvas,width,height);drawClassificationOnCanvas(result.multiHandLandmarks().get(i).getLandmarkList(),canvas);}}
** HandsResultGlRenderer.java 用到的是OPENGL，在里面做修改很麻烦因此，转到MainActivity这里修改**

MainActivity.java --setupStreamingModePipeline

只需要在hands.setResultListener() 里面添加后续对结果的处理就可以了
比如添加手势的判断

  /** Sets up core workflow for streaming mode. */private void setupStreamingModePipeline(InputSource inputSource) {this.inputSource = inputSource;// Initializes a new MediaPipe Hands solution instance in the streaming mode.
//        创建手部检测对象hands =new Hands(this,HandsOptions.builder().setStaticImageMode(false).setMaxNumHands(2).setRunOnGpu(RUN_ON_GPU).build());
//        添加错误监听器hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));if (inputSource == InputSource.CAMERA) {//            监听当前页面的视频输入流cameraInput = new CameraInput(this);
//            这个不太明白cameraInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));} else if (inputSource == InputSource.VIDEO) {videoInput = new VideoInput(this);videoInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));}// 使用用户定义的 HandsResultGlRenderer 初始化新的 Gl 表面视图。glSurfaceView =new SolutionGlSurfaceView<>(this, hands.getGlContext(), hands.getGlMajorVersion());glSurfaceView.setSolutionResultRenderer(new HandsResultGlRenderer());glSurfaceView.setRenderInputImage(true);//回调函数，设置监听器就可以根据获取的结果进行下一步处理hands.setResultListener(handsResult -> {logWristLandmark(handsResult, /*showPixelValues=*/ false);glSurfaceView.setRenderData(handsResult);glSurfaceView.requestRender();int numHands = handsResult.multiHandLandmarks().size();
//                    特殊检测if(numHands>1){//检测两只手detect_res=twoHandDetect(handsResult.multiHandLandmarks().get(0).getLandmarkList(),handsResult.multiHandLandmarks().get(1).getLandmarkList());}else{//                        检测一只手的for (int i = 0; i < numHands; ++i) {//判断是否是左手
//                            boolean isLeftHand = handsResult.multiHandedness().get(i).getLabel().equals("Left");
//                        定义了一个成员变量String code=baseHandCount(handsResult.multiHandLandmarks().get(i).getLandmarkList());detect_res = basePost(code);}}//      创建一个线程new MessageShow().start();});

手势判断

通过计算欧式距离（三维空间两点之间的距离）判断手指有没有弯曲来判断手势，要是一些困难的手势可能识别不了。
代码如下

 //    手指弯曲计算，计算五个手指那个手指是弯曲的private String baseHandCount(List<NormalizedLandmark> handLandmarkList){//        从拇指开始是one，two这样List<Boolean> resultList=new ArrayList<>();
//        写字判断类别：/*计算拇指是否弯曲计算第四个点到第17点距离小于第5点到17点距离*/float seventhreenx=handLandmarkList.get(17).getX();float seventhreeny=handLandmarkList.get(17).getY();float seventhreenz=handLandmarkList.get(17).getZ();float fourx=handLandmarkList.get(4).getX();float foury=handLandmarkList.get(4).getY();float fourz=handLandmarkList.get(4).getZ();float fivex=handLandmarkList.get(5).getX();float fivey=handLandmarkList.get(5).getY();float fivez=handLandmarkList.get(5).getZ();float distance4=(fourx-seventhreenx)*(fourx-seventhreenx)+(foury-seventhreeny)*(foury-seventhreeny)+(fourz-seventhreenz)*(fourz-seventhreenz);float distance5=(fivex-seventhreenx)*(fivex-seventhreenx)+(fivey-seventhreeny)*(fivey-seventhreeny)+(fivez-seventhreenz)*(fivez-seventhreenz);if(distance5-distance4>0){//            有弯曲resultList.add(true);}else{resultList.add(false);
//            没有弯曲}/*计算四个手指是否弯曲手指的指尖距离大于关节距离*/// 定义0点坐标zerox,zeroy,zerozfloat zerox=handLandmarkList.get(0).getX();float zeroy=handLandmarkList.get(0).getY();float zeroz=handLandmarkList.get(0).getZ();//该遍历是:(6,8),(10,12),(14,16),(18,20)int[] intarr=new int[]{6,8,10,12,14,16,18,20};for(int i =0;i<4;i++){//0,1,2,3,,取i,i+1),2i,2i+1float closex = handLandmarkList.get(intarr[2*i]).getX();float closey = handLandmarkList.get(intarr[2*i]).getY();float closez = handLandmarkList.get(intarr[2*i]).getZ();float farx = handLandmarkList.get(intarr[2*i+1]).getX();float fary = handLandmarkList.get(intarr[2*i+1]).getY();float farz = handLandmarkList.get(intarr[2*i+1]).getZ();//取出点坐标与0点求欧式距离float close_distance=(closex-zerox)*(closex-zerox)+(closey-zeroy)*(closey-zeroy)+(closez-zeroz)*(closez-zeroz);float far_distance=(farx-zerox)*(farx-zerox)+(fary-zeroy)*(fary-zeroy)+(farz-zeroz)*(farz-zeroz);float between =close_distance- far_distance  ;float zero=0;if(between>zero){//弯曲resultList.add(true);}else{//  没有弯曲resultList.add(false);}}String code="";for(boolean b :resultList){if(b){code+="1";}else{code=code+"0";}}return code;}private String basePost(String code){String res="";switch (code){case "01111":res="GOOD";
//                img_love.setImageResource(R.drawable.good);break;case "10111":res="数字1";
//                img_love.setImageResource(R.drawable.one);break;case "11111":res="fist";
//                img_love.setImageResource(R.drawable.fist);break;//没有图片case "10011":res="数字2";break;case "10001":res="数字3";break;case "10000":res="数字4";break;case "00000":res="数字5";break;case "01110":res="数字6";break;case "00111":res="数字7";break;case "00011":res="数字8";break;case "11011":res="国际友好手势";break;case "11000":res="OK";break;case "00110":res="Love2";break;default:res="none";break;}return res;}private String twoHandDetect(List<NormalizedLandmark> landmark1,List<NormalizedLandmark> landmark2){String code1 = baseHandCount(landmark1);String code2 = baseHandCount(landmark2);//判断Loveif(code1.endsWith("111")&&code2.endsWith("111")||code1.endsWith("000")&&code2.endsWith("000")){// 两个指尖距离小于指尖到关节的距离float hand1x4=landmark1.get(4).getX();float hand1y4=landmark1.get(4).getY();float hand1z4=landmark1.get(4).getZ();float hand2x4=landmark2.get(4).getX();float hand2y4=landmark2.get(4).getY();float hand2z4=landmark2.get(4).getZ();float hand1x8=landmark1.get(8).getX();float hand1y8=landmark1.get(8).getY();float hand1z8=landmark1.get(8).getZ();float hand2x8=landmark2.get(8).getX();float hand2y8=landmark2.get(8).getY();float hand2z8=landmark2.get(8).getZ();//距离计算:两只手食指指尖和拇指指尖距离计算float distance_muzhi=(hand1x4-hand2x4)*(hand1x4-hand2x4)+(hand1y4-hand2y4)*(hand1y4-hand2y4)+(hand1z4-hand2z4)*(hand1z4-hand2z4);float distance_shizhi=(hand1x8-hand2x8)*(hand1x8-hand2x8)+(hand1y8-hand2y8)*(hand1y8-hand2y8)+(hand1z8-hand2z8)*(hand1z8-hand2z8);//指尖到指尖关节距离计算float hand1x3=landmark1.get(3).getX();float hand1y3=landmark1.get(3).getY();float hand1z3=landmark1.get(3).getZ();float distance1_34=(hand1x4-hand1x3)*(hand1x4-hand1x3)+(hand1y4-hand1y3)*(hand1y4-hand1y3)+(hand1z4-hand1z3)*(hand1z4-hand1z3);float hand1x7=landmark1.get(7).getX();float hand1y7=landmark1.get(7).getY();float hand1z7=landmark1.get(7).getZ();float distance1_78=(hand1x8-hand1x7)*(hand1x8-hand1x7)+(hand1y8-hand1y7)*(hand1y8-hand1y7)+(hand1z8-hand1z7)*(hand1z8-hand1z7);float zero=0;if((distance1_34*1.5-distance_muzhi>zero)&&(distance1_78-distance_shizhi>zero)){//手势正确return "Love";}}//判断flower 五根手指都不弯曲if("00000".equals(code1)&&"00000".equals(code2)){//0点之间的距离：float hand1x0=landmark1.get(0).getX();float hand1y0=landmark1.get(0).getY();float hand1z0=landmark1.get(0).getZ();float hand2x0=landmark2.get(0).getX();float hand2y0=landmark2.get(0).getY();float hand2z0=landmark2.get(0).getZ();float distance0_0=(hand1x0-hand2x0)*(hand1x0-hand2x0)+(hand1y0-hand2y0)*(hand1y0-hand2y0)+(hand1z0-hand2z0)*(hand1z0-hand2z0);float hand1x17=landmark1.get(17).getX();float hand1y17=landmark1.get(17).getY();float hand1z17=landmark1.get(17).getZ();float distance0_17=(hand1x0-hand1x17)*(hand1x0-hand1x17)+(hand1y0-hand1y17)*(hand1y0-hand1y17)+(hand1z0-hand1z17)*(hand1z0-hand1z17);float zero=0;if(distance0_17-distance0_0>zero){return "flower";}}return "none";}

完整代码：
MainActivity.java

package com.example.test05;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.exifinterface.media.ExifInterface;
// ContentResolver dependency
import com.google.mediapipe.formats.proto.LandmarkProto.Landmark;
import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
import com.google.mediapipe.solutioncore.CameraInput;
import com.google.mediapipe.solutioncore.SolutionGlSurfaceView;
import com.google.mediapipe.solutioncore.VideoInput;
import com.google.mediapipe.solutions.hands.HandLandmark;
import com.google.mediapipe.solutions.hands.Hands;
import com.google.mediapipe.solutions.hands.HandsOptions;
import com.google.mediapipe.solutions.hands.HandsResult;import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;public class MainActivity extends AppCompatActivity {public String detect_res="";private Handler uiHandler = new Handler();private static final String TAG = "MainActivity";private Hands hands;// Run the pipeline and the model inference on GPU or CPU.private static final boolean RUN_ON_GPU = true;private enum InputSource {UNKNOWN,IMAGE,VIDEO,CAMERA,}private InputSource inputSource = InputSource.UNKNOWN;// Image demo UI and image loader components.private ActivityResultLauncher<Intent> imageGetter;private HandsResultImageView imageView;// Video demo UI and video loader components.private VideoInput videoInput;private ActivityResultLauncher<Intent> videoGetter;// Live camera demo UI and camera components.private CameraInput cameraInput;private SolutionGlSurfaceView<HandsResult> glSurfaceView;private Button button_test_camera;private ImageView img_love;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button_test_camera=findViewById(R.id.button_test_camera);System.out.println("----"+button_test_camera);button_test_camera.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//                Intent intent = new Intent(MainActivity.this,CameraActivity.class);
//                startActivity(intent);}});img_love=findViewById(R.id.img_love);setupStaticImageDemoUiComponents();setupLiveDemoUiComponents();}/** Sets up core workflow for static image mode. */private void setupStaticImageModePipeline() {this.inputSource = InputSource.IMAGE;// Initializes a new MediaPipe Hands solution instance in the static image mode.hands =new Hands(this,HandsOptions.builder().setStaticImageMode(true).setMaxNumHands(2).setRunOnGpu(RUN_ON_GPU).build());// 将 MediaPipe Hands 解决方案连接到用户定义的 HandsResultImageView。/*也就是hand检测的结果会传到这里面来，执行hand.sent()类似于触发事件监听器，然后就会执行这个lambda表达式*/hands.setResultListener(handsResult -> {logWristLandmark(handsResult, /*showPixelValues=*/ true);imageView.setHandsResult(handsResult);runOnUiThread(() -> imageView.update());});hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));// Updates the preview layout.FrameLayout frameLayout = findViewById(R.id.preview_display_layout);frameLayout.removeAllViewsInLayout();imageView.setImageDrawable(null);frameLayout.addView(imageView);imageView.setVisibility(View.VISIBLE);}private Bitmap downscaleBitmap(Bitmap originalBitmap) {double aspectRatio = (double) originalBitmap.getWidth() / originalBitmap.getHeight();int width = imageView.getWidth();int height = imageView.getHeight();if (((double) imageView.getWidth() / imageView.getHeight()) > aspectRatio) {width = (int) (height * aspectRatio);} else {height = (int) (width / aspectRatio);}return Bitmap.createScaledBitmap(originalBitmap, width, height, false);}private Bitmap rotateBitmap(Bitmap inputBitmap, InputStream imageData) throws IOException {int orientation =new ExifInterface(imageData).getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);if (orientation == ExifInterface.ORIENTATION_NORMAL) {return inputBitmap;}Matrix matrix = new Matrix();switch (orientation) {case ExifInterface.ORIENTATION_ROTATE_90:matrix.postRotate(90);break;case ExifInterface.ORIENTATION_ROTATE_180:matrix.postRotate(180);break;case ExifInterface.ORIENTATION_ROTATE_270:matrix.postRotate(270);break;default:matrix.postRotate(0);}return Bitmap.createBitmap(inputBitmap, 0, 0, inputBitmap.getWidth(), inputBitmap.getHeight(), matrix, true);}/** Sets up the UI components for the static image demo. */private void setupStaticImageDemoUiComponents() {// The Intent to access gallery and read images as bitmap.imageGetter =registerForActivityResult(new ActivityResultContracts.StartActivityForResult(),result -> {Intent resultIntent = result.getData();if (resultIntent != null) {if (result.getResultCode() == RESULT_OK) {Bitmap bitmap = null;try {bitmap =downscaleBitmap(MediaStore.Images.Media.getBitmap(this.getContentResolver(), resultIntent.getData()));} catch (IOException e) {Log.e(TAG, "Bitmap reading error:" + e);}try {InputStream imageData =this.getContentResolver().openInputStream(resultIntent.getData());bitmap = rotateBitmap(bitmap, imageData);} catch (IOException e) {Log.e(TAG, "Bitmap rotation error:" + e);}if (bitmap != null) {//这里获取图片System.out.println(bitmap);
//                                        save_image_permisstion();
//                                        saveBitmap(bitmap,"test");
//                                        这里图片手势检测hands.send(bitmap);}}}});Button loadImageButton = findViewById(R.id.button_load_picture);loadImageButton.setOnClickListener(v -> {// 鼠标点击事件的时候跳出框去本地选择图片if (inputSource != InputSource.IMAGE) {stopCurrentPipeline();setupStaticImageModePipeline();}// Reads images from gallery.Intent pickImageIntent = new Intent(Intent.ACTION_PICK);//选择完成图片以后接收选择的图片数据pickImageIntent.setDataAndType(MediaStore.Images.Media.INTERNAL_CONTENT_URI, "image/*");
//                    执行registerForActivityResult 里面调用了手势检测hand.sent()imageGetter.launch(pickImageIntent);});// 手势检测的结果显示到当前页面上imageView = new HandsResultImageView(this);}/** Sets up the UI components for the live demo with camera input. */private void setupLiveDemoUiComponents() {Button startCameraButton = findViewById(R.id.button_start_camera);startCameraButton.setOnClickListener(v -> {if (inputSource == InputSource.CAMERA) {return;}stopCurrentPipeline();setupStreamingModePipeline(InputSource.CAMERA);});}/** Sets up core workflow for streaming mode. */private void setupStreamingModePipeline(InputSource inputSource) {this.inputSource = inputSource;// Initializes a new MediaPipe Hands solution instance in the streaming mode.
//        创建手部检测对象hands =new Hands(this,HandsOptions.builder().setStaticImageMode(false).setMaxNumHands(2).setRunOnGpu(RUN_ON_GPU).build());
//        添加错误监听器hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));if (inputSource == InputSource.CAMERA) {//            监听当前页面的视频输入流cameraInput = new CameraInput(this);
//            这个不太明白cameraInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));} else if (inputSource == InputSource.VIDEO) {videoInput = new VideoInput(this);videoInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));}// 使用用户定义的 HandsResultGlRenderer 初始化新的 Gl 表面视图。glSurfaceView =new SolutionGlSurfaceView<>(this, hands.getGlContext(), hands.getGlMajorVersion());glSurfaceView.setSolutionResultRenderer(new HandsResultGlRenderer());glSurfaceView.setRenderInputImage(true);//回调函数，设置监听器就可以根据获取的结果进行下一步处理hands.setResultListener(handsResult -> {logWristLandmark(handsResult, /*showPixelValues=*/ false);glSurfaceView.setRenderData(handsResult);glSurfaceView.requestRender();int numHands = handsResult.multiHandLandmarks().size();
//                    特殊检测if(numHands>1){//检测两只手detect_res=twoHandDetect(handsResult.multiHandLandmarks().get(0).getLandmarkList(),handsResult.multiHandLandmarks().get(1).getLandmarkList());}else{//                        检测一只手的for (int i = 0; i < numHands; ++i) {//判断是否是左手
//                            boolean isLeftHand = handsResult.multiHandedness().get(i).getLabel().equals("Left");
//                        定义了一个成员变量String code=baseHandCount(handsResult.multiHandLandmarks().get(i).getLandmarkList());detect_res = basePost(code);}}//      创建一个线程new MessageShow().start();});// 附加 gl 表面视图后启动相机的可运行程序。// 对于视频输入源，当视频uri可用时将调用videoInput.start()。if (inputSource == InputSource.CAMERA) {glSurfaceView.post(this::startCamera);}// Updates the preview layout.FrameLayout frameLayout = findViewById(R.id.preview_display_layout);imageView.setVisibility(View.GONE);frameLayout.removeAllViewsInLayout();frameLayout.addView(glSurfaceView);glSurfaceView.setVisibility(View.VISIBLE);frameLayout.requestLayout();}private void startCamera() {cameraInput.start(this,hands.getGlContext(),CameraInput.CameraFacing.FRONT,glSurfaceView.getWidth(),glSurfaceView.getHeight());}@Overrideprotected void onResume() {super.onResume();if (inputSource == InputSource.CAMERA) {// Restarts the camera and the opengl surface rendering.cameraInput = new CameraInput(this);cameraInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));glSurfaceView.post(this::startCamera);glSurfaceView.setVisibility(View.VISIBLE);} else if (inputSource == InputSource.VIDEO) {videoInput.resume();}}@Overrideprotected void onPause() {super.onPause();if (inputSource == InputSource.CAMERA) {glSurfaceView.setVisibility(View.GONE);cameraInput.close();} else if (inputSource == InputSource.VIDEO) {videoInput.pause();}}private void stopCurrentPipeline() {if (cameraInput != null) {cameraInput.setNewFrameListener(null);cameraInput.close();}if (videoInput != null) {videoInput.setNewFrameListener(null);videoInput.close();}if (glSurfaceView != null) {glSurfaceView.setVisibility(View.GONE);}if (hands != null) {hands.close();}}private void logWristLandmark(HandsResult result, boolean showPixelValues) {if (result.multiHandLandmarks().isEmpty()) {return;}NormalizedLandmark wristLandmark =result.multiHandLandmarks().get(0).getLandmarkList().get(HandLandmark.WRIST);// For Bitmaps, show the pixel values. For texture inputs, show the normalized coordinates.if (showPixelValues) {int width = result.inputBitmap().getWidth();int height = result.inputBitmap().getHeight();Log.i(TAG,String.format("MediaPipe Hand wrist coordinates (pixel values): x=%f, y=%f",wristLandmark.getX() * width, wristLandmark.getY() * height));} else {Log.i(TAG,String.format("MediaPipe Hand wrist normalized coordinates (value range: [0, 1]): x=%f, y=%f",wristLandmark.getX(), wristLandmark.getY()));}if (result.multiHandWorldLandmarks().isEmpty()) {return;}Landmark wristWorldLandmark =result.multiHandWorldLandmarks().get(0).getLandmarkList().get(HandLandmark.WRIST);Log.i(TAG,String.format("MediaPipe Hand wrist world coordinates (in meters with the origin at the hand's"+ " approximate geometric center): x=%f m, y=%f m, z=%f m",wristWorldLandmark.getX(), wristWorldLandmark.getY(), wristWorldLandmark.getZ()));}/*保存图片方法
*/public void save_image_permisstion(){String[] PERMISSIONS = {"android.permission.READ_EXTERNAL_STORAGE","android.permission.WRITE_EXTERNAL_STORAGE" };//检测是否有写的权限int permission = ContextCompat.checkSelfPermission(this,"android.permission.WRITE_EXTERNAL_STORAGE");if (permission != PackageManager.PERMISSION_GRANTED) {// 没有写的权限，去申请写的权限，会弹出对话框ActivityCompat.requestPermissions(this, PERMISSIONS,1);}}
//    保存页面view到图片public void SaveBitmapFromView(View view) {int w = view.getWidth();int h = view.getHeight();Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);Canvas c = new Canvas(bmp);view.layout(0, 0, w, h);view.draw(c);// 缩小图片Matrix matrix = new Matrix();matrix.postScale(0.5f,0.5f); //长和宽放大缩小的比例bmp = Bitmap.createBitmap(bmp,0,0,        bmp.getWidth(),bmp.getHeight(),matrix,true);DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");saveBitmap(bmp,format.format(new Date())+".JPEG");}/** 保存文件，文件名为当前日期*/public void saveBitmap(Bitmap bitmap, String bitName){File file = new File(this.getFilesDir(), "test.jpg");
//        if(Build.BRAND .equals("Xiaomi") ){ // 小米手机
//            fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/Camera/"+bitName ;
//        }else{ // Meizu 、Oppo
//            fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/"+bitName ;
//        }if(file.exists()){file.delete();}FileOutputStream out;try{out = new FileOutputStream(file);// 格式为 JPEG，照相机拍出的图片为JPEG格式的，PNG格式的不能显示在相册中if(bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out)){out.flush();out.close();
// 插入图库MediaStore.Images.Media.insertImage(this.getContentResolver(), file.getAbsolutePath(), bitName, null);}}catch (FileNotFoundException e){e.printStackTrace();}catch (IOException e){e.printStackTrace();}// 发送广播，通知刷新图库的显示}//手势检测//    手指弯曲计算，计算五个手指那个手指是弯曲的private String baseHandCount(List<NormalizedLandmark> handLandmarkList){//        从拇指开始是one，two这样List<Boolean> resultList=new ArrayList<>();
//        写字判断类别：/*计算拇指是否弯曲计算第四个点到第17点距离小于第5点到17点距离*/float seventhreenx=handLandmarkList.get(17).getX();float seventhreeny=handLandmarkList.get(17).getY();float seventhreenz=handLandmarkList.get(17).getZ();float fourx=handLandmarkList.get(4).getX();float foury=handLandmarkList.get(4).getY();float fourz=handLandmarkList.get(4).getZ();float fivex=handLandmarkList.get(5).getX();float fivey=handLandmarkList.get(5).getY();float fivez=handLandmarkList.get(5).getZ();float distance4=(fourx-seventhreenx)*(fourx-seventhreenx)+(foury-seventhreeny)*(foury-seventhreeny)+(fourz-seventhreenz)*(fourz-seventhreenz);float distance5=(fivex-seventhreenx)*(fivex-seventhreenx)+(fivey-seventhreeny)*(fivey-seventhreeny)+(fivez-seventhreenz)*(fivez-seventhreenz);if(distance5-distance4>0){//            有弯曲resultList.add(true);}else{resultList.add(false);
//            没有弯曲}/*计算四个手指是否弯曲手指的指尖距离大于关节距离*/// 定义0点坐标zerox,zeroy,zerozfloat zerox=handLandmarkList.get(0).getX();float zeroy=handLandmarkList.get(0).getY();float zeroz=handLandmarkList.get(0).getZ();//该遍历是:(6,8),(10,12),(14,16),(18,20)int[] intarr=new int[]{6,8,10,12,14,16,18,20};for(int i =0;i<4;i++){//0,1,2,3,,取i,i+1),2i,2i+1float closex = handLandmarkList.get(intarr[2*i]).getX();float closey = handLandmarkList.get(intarr[2*i]).getY();float closez = handLandmarkList.get(intarr[2*i]).getZ();float farx = handLandmarkList.get(intarr[2*i+1]).getX();float fary = handLandmarkList.get(intarr[2*i+1]).getY();float farz = handLandmarkList.get(intarr[2*i+1]).getZ();//取出点坐标与0点求欧式距离float close_distance=(closex-zerox)*(closex-zerox)+(closey-zeroy)*(closey-zeroy)+(closez-zeroz)*(closez-zeroz);float far_distance=(farx-zerox)*(farx-zerox)+(fary-zeroy)*(fary-zeroy)+(farz-zeroz)*(farz-zeroz);float between =close_distance- far_distance  ;float zero=0;if(between>zero){//弯曲resultList.add(true);}else{//  没有弯曲resultList.add(false);}}String code="";for(boolean b :resultList){if(b){code+="1";}else{code=code+"0";}}return code;}private String basePost(String code){String res="";switch (code){case "01111":res="GOOD";
//                img_love.setImageResource(R.drawable.good);break;case "10111":res="数字1";
//                img_love.setImageResource(R.drawable.one);break;case "11111":res="fist";
//                img_love.setImageResource(R.drawable.fist);break;//没有图片case "10011":res="数字2";break;case "10001":res="数字3";break;case "10000":res="数字4";break;case "00000":res="数字5";break;case "01110":res="数字6";break;case "00111":res="数字7";break;case "00011":res="数字8";break;case "11011":res="国际友好手势";break;case "11000":res="OK";break;case "00110":res="Love2";break;default:res="none";break;}return res;}private String twoHandDetect(List<NormalizedLandmark> landmark1,List<NormalizedLandmark> landmark2){String code1 = baseHandCount(landmark1);String code2 = baseHandCount(landmark2);//判断Loveif(code1.endsWith("111")&&code2.endsWith("111")||code1.endsWith("000")&&code2.endsWith("000")){// 两个指尖距离小于指尖到关节的距离float hand1x4=landmark1.get(4).getX();float hand1y4=landmark1.get(4).getY();float hand1z4=landmark1.get(4).getZ();float hand2x4=landmark2.get(4).getX();float hand2y4=landmark2.get(4).getY();float hand2z4=landmark2.get(4).getZ();float hand1x8=landmark1.get(8).getX();float hand1y8=landmark1.get(8).getY();float hand1z8=landmark1.get(8).getZ();float hand2x8=landmark2.get(8).getX();float hand2y8=landmark2.get(8).getY();float hand2z8=landmark2.get(8).getZ();//距离计算:两只手食指指尖和拇指指尖距离计算float distance_muzhi=(hand1x4-hand2x4)*(hand1x4-hand2x4)+(hand1y4-hand2y4)*(hand1y4-hand2y4)+(hand1z4-hand2z4)*(hand1z4-hand2z4);float distance_shizhi=(hand1x8-hand2x8)*(hand1x8-hand2x8)+(hand1y8-hand2y8)*(hand1y8-hand2y8)+(hand1z8-hand2z8)*(hand1z8-hand2z8);//指尖到指尖关节距离计算float hand1x3=landmark1.get(3).getX();float hand1y3=landmark1.get(3).getY();float hand1z3=landmark1.get(3).getZ();float distance1_34=(hand1x4-hand1x3)*(hand1x4-hand1x3)+(hand1y4-hand1y3)*(hand1y4-hand1y3)+(hand1z4-hand1z3)*(hand1z4-hand1z3);float hand1x7=landmark1.get(7).getX();float hand1y7=landmark1.get(7).getY();float hand1z7=landmark1.get(7).getZ();float distance1_78=(hand1x8-hand1x7)*(hand1x8-hand1x7)+(hand1y8-hand1y7)*(hand1y8-hand1y7)+(hand1z8-hand1z7)*(hand1z8-hand1z7);float zero=0;if((distance1_34*1.5-distance_muzhi>zero)&&(distance1_78-distance_shizhi>zero)){//手势正确return "Love";}}//判断flower 五根手指都不弯曲if("00000".equals(code1)&&"00000".equals(code2)){//0点之间的距离：float hand1x0=landmark1.get(0).getX();float hand1y0=landmark1.get(0).getY();float hand1z0=landmark1.get(0).getZ();float hand2x0=landmark2.get(0).getX();float hand2y0=landmark2.get(0).getY();float hand2z0=landmark2.get(0).getZ();float distance0_0=(hand1x0-hand2x0)*(hand1x0-hand2x0)+(hand1y0-hand2y0)*(hand1y0-hand2y0)+(hand1z0-hand2z0)*(hand1z0-hand2z0);float hand1x17=landmark1.get(17).getX();float hand1y17=landmark1.get(17).getY();float hand1z17=landmark1.get(17).getZ();float distance0_17=(hand1x0-hand1x17)*(hand1x0-hand1x17)+(hand1y0-hand1y17)*(hand1y0-hand1y17)+(hand1z0-hand1z17)*(hand1z0-hand1z17);float zero=0;if(distance0_17-distance0_0>zero){return "flower";}}return "none";}//显示class MessageShow extends Thread{@Overridepublic void run() {Runnable runnable = new Runnable() {@Overridepublic void run() {button_test_camera.setText(detect_res);if("Love".equals(detect_res)){img_love.setImageResource(R.drawable.love128);img_love.setVisibility(View.VISIBLE);}else if("Love2".equals(detect_res)){img_love.setImageResource(R.drawable.love2);img_love.setVisibility(View.VISIBLE);}else if("GOOD".equals(detect_res)){img_love.setImageResource(R.drawable.good);img_love.setVisibility(View.VISIBLE);}else if("OK".equals(detect_res)){img_love.setImageResource(R.drawable.finish2);img_love.setVisibility(View.VISIBLE);}else if("fist".equals(detect_res)){img_love.setImageResource(R.drawable.fist);img_love.setVisibility(View.VISIBLE);} else if("数字1".equals(detect_res)){img_love.setImageResource(R.drawable.one);img_love.setVisibility(View.VISIBLE);}else if("数字2".equals(detect_res)){img_love.setImageResource(R.drawable.ye128);img_love.setVisibility(View.VISIBLE);}else if("flower".equals(detect_res)){img_love.setImageResource(R.drawable.flower);img_love.setVisibility(View.VISIBLE);}else{img_love.setVisibility(View.INVISIBLE);}}};uiHandler.post(runnable);}}//    class ShowPic extends Thread{//        @Override
//        public void run() {//            Runnable runnable = new Runnable() {//                @Override
//                public void run() {//                    img_love.setVisibility(View.INVISIBLE);
//                }
//            };
//            uiHandler.post(runnable);
//        }
//    }
}

HandsResultGlRenderer.java

package com.example.test05;// Copyright 2021 The MediaPipe Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.import android.opengl.GLES20;
import android.widget.Button;import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
import com.google.mediapipe.solutioncore.ResultGlRenderer;
import com.google.mediapipe.solutions.hands.Hands;
import com.google.mediapipe.solutions.hands.HandsResult;import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.util.List;/** A custom implementation of {@link ResultGlRenderer} to render {@link HandsResult}. */
public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {private static final String TAG = "HandsResultGlRenderer";private static final float[] LEFT_HAND_CONNECTION_COLOR = new float[] {0.2f, 1f, 0.2f, 1f};private static final float[] RIGHT_HAND_CONNECTION_COLOR = new float[] {1f, 0.2f, 0.2f, 1f};private static final float CONNECTION_THICKNESS = 25.0f;private static final float[] LEFT_HAND_HOLLOW_CIRCLE_COLOR = new float[] {0.2f, 1f, 0.2f, 1f};private static final float[] RIGHT_HAND_HOLLOW_CIRCLE_COLOR = new float[] {1f, 0.2f, 0.2f, 1f};private static final float HOLLOW_CIRCLE_RADIUS = 0.01f;private static final float[] LEFT_HAND_LANDMARK_COLOR = new float[] {1f, 0.2f, 0.2f, 1f};private static final float[] RIGHT_HAND_LANDMARK_COLOR = new float[] {0.2f, 1f, 0.2f, 1f};private static final float LANDMARK_RADIUS = 0.008f;private static final int NUM_SEGMENTS = 120;private static final String VERTEX_SHADER ="uniform mat4 uProjectionMatrix;\n"+ "attribute vec4 vPosition;\n"+ "void main() {\n"+ "  gl_Position = uProjectionMatrix * vPosition;\n"+ "}";private static final String FRAGMENT_SHADER ="precision mediump float;\n"+ "uniform vec4 uColor;\n"+ "void main() {\n"+ "  gl_FragColor = uColor;\n"+ "}";private int program;private int positionHandle;private int projectionMatrixHandle;private int colorHandle;private int loadShader(int type, String shaderCode) {int shader = GLES20.glCreateShader(type);GLES20.glShaderSource(shader, shaderCode);GLES20.glCompileShader(shader);return shader;}@Overridepublic void setupRendering() {program = GLES20.glCreateProgram();int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADER);int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, FRAGMENT_SHADER);GLES20.glAttachShader(program, vertexShader);GLES20.glAttachShader(program, fragmentShader);GLES20.glLinkProgram(program);positionHandle = GLES20.glGetAttribLocation(program, "vPosition");projectionMatrixHandle = GLES20.glGetUniformLocation(program, "uProjectionMatrix");colorHandle = GLES20.glGetUniformLocation(program, "uColor");}@Overridepublic void renderResult(HandsResult result, float[] projectionMatrix) {if (result == null) {return;}GLES20.glUseProgram(program);GLES20.glUniformMatrix4fv(projectionMatrixHandle, 1, false, projectionMatrix, 0);GLES20.glLineWidth(CONNECTION_THICKNESS);int numHands = result.multiHandLandmarks().size();for (int i = 0; i < numHands; ++i) {boolean isLeftHand = result.multiHandedness().get(i).getLabel().equals("Left");drawConnections(result.multiHandLandmarks().get(i).getLandmarkList(),isLeftHand ? LEFT_HAND_CONNECTION_COLOR : RIGHT_HAND_CONNECTION_COLOR);for (NormalizedLandmark landmark : result.multiHandLandmarks().get(i).getLandmarkList()) {// Draws the landmark.drawCircle(landmark.getX(),landmark.getY(),isLeftHand ? LEFT_HAND_LANDMARK_COLOR : RIGHT_HAND_LANDMARK_COLOR);// Draws a hollow circle around the landmark.drawHollowCircle(landmark.getX(),landmark.getY(),isLeftHand ? LEFT_HAND_HOLLOW_CIRCLE_COLOR : RIGHT_HAND_HOLLOW_CIRCLE_COLOR);}}}/*** Deletes the shader program.** <p>This is only necessary if one wants to release the program while keeping the context around.*/public void release() {GLES20.glDeleteProgram(program);}private void drawConnections(List<NormalizedLandmark> handLandmarkList, float[] colorArray) {GLES20.glUniform4fv(colorHandle, 1, colorArray, 0);for (Hands.Connection c : Hands.HAND_CONNECTIONS) {NormalizedLandmark start = handLandmarkList.get(c.start());NormalizedLandmark end = handLandmarkList.get(c.end());float[] vertex = {start.getX(), start.getY(), end.getX(), end.getY()};FloatBuffer vertexBuffer =ByteBuffer.allocateDirect(vertex.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer().put(vertex);vertexBuffer.position(0);GLES20.glEnableVertexAttribArray(positionHandle);GLES20.glVertexAttribPointer(positionHandle, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);GLES20.glDrawArrays(GLES20.GL_LINES, 0, 2);//line}}
//调用一次画一个点private void drawCircle(float x, float y, float[] colorArray) {GLES20.glUniform4fv(colorHandle, 1, colorArray, 0);int vertexCount = NUM_SEGMENTS + 2;float[] vertices = new float[vertexCount * 3];vertices[0] = x;vertices[1] = y;vertices[2] = 0;for (int i = 1; i < vertexCount; i++) {float angle = 2.0f * i * (float) Math.PI / NUM_SEGMENTS;int currentIndex = 3 * i;vertices[currentIndex] = x + (float) (LANDMARK_RADIUS * Math.cos(angle));vertices[currentIndex + 1] = y + (float) (LANDMARK_RADIUS * Math.sin(angle));vertices[currentIndex + 2] = 0;}FloatBuffer vertexBuffer =ByteBuffer.allocateDirect(vertices.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer().put(vertices);vertexBuffer.position(0);GLES20.glEnableVertexAttribArray(positionHandle);GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 0, vertexBuffer);GLES20.glDrawArrays(GLES20.GL_TRIANGLE_FAN, 0, vertexCount); //这里不一样GLES20.GL_TRIANGLE_FAN}private void drawHollowCircle(float x, float y, float[] colorArray) {GLES20.glUniform4fv(colorHandle, 1, colorArray, 0);int vertexCount = NUM_SEGMENTS + 1;//2float[] vertices = new float[vertexCount * 3];for (int i = 0; i < vertexCount; i++) {float angle = 2.0f * i * (float) Math.PI / NUM_SEGMENTS;int currentIndex = 3 * i;vertices[currentIndex] = x + (float) (HOLLOW_CIRCLE_RADIUS * Math.cos(angle));vertices[currentIndex + 1] = y + (float) (HOLLOW_CIRCLE_RADIUS * Math.sin(angle));vertices[currentIndex + 2] = 0;}FloatBuffer vertexBuffer =ByteBuffer.allocateDirect(vertices.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer().put(vertices);vertexBuffer.position(0);GLES20.glEnableVertexAttribArray(positionHandle);GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 0, vertexBuffer);GLES20.glDrawArrays(GLES20.GL_LINE_STRIP, 0, vertexCount);}}

HandsResultImageView.java

package com.example.test05;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;import androidx.appcompat.widget.AppCompatImageView;import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
import com.google.mediapipe.solutions.hands.Hands;
import com.google.mediapipe.solutions.hands.HandsResult;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
//这里的代码是用来处理单个图片的结果
/** An ImageView implementation for displaying {@link HandsResult}. */
public class HandsResultImageView extends AppCompatImageView {private static final String TAG = "HandsResultImageView";private static final int LEFT_HAND_CONNECTION_COLOR = Color.parseColor("#30FF30");private static final int RIGHT_HAND_CONNECTION_COLOR = Color.parseColor("#FF3030");private static final int CONNECTION_THICKNESS = 8; // Pixelsprivate static final int LEFT_HAND_HOLLOW_CIRCLE_COLOR = Color.parseColor("#30FF30");private static final int RIGHT_HAND_HOLLOW_CIRCLE_COLOR = Color.parseColor("#FF3030");private static final int HOLLOW_CIRCLE_WIDTH = 5; // Pixelsprivate static final int LEFT_HAND_LANDMARK_COLOR = Color.parseColor("#FF3030");private static final int RIGHT_HAND_LANDMARK_COLOR = Color.parseColor("#30FF30");private static final int LANDMARK_RADIUS = 10; // Pixelsprivate Bitmap latest;//    传入一个页面 MainActivity的页面是activity_main,是contextpublic HandsResultImageView(Context context) {super(context);setScaleType(ScaleType.FIT_CENTER);}/*** Sets a {@link HandsResult} to render.** @param result a {@link HandsResult} object that contains the solution outputs and the input*     {@link Bitmap}.*/public void setHandsResult(HandsResult result) {//        这里接收手势检测的结果if (result == null) {return;}Bitmap bmInput = result.inputBitmap();int width = bmInput.getWidth();int height = bmInput.getHeight();latest = Bitmap.createBitmap(width, height, bmInput.getConfig());Canvas canvas = new Canvas(latest);canvas.drawBitmap(bmInput, new Matrix(), null);
//        检测到手的数量int numHands = result.multiHandLandmarks().size();for (int i = 0; i < numHands; ++i) {drawLandmarksOnCanvas(result.multiHandLandmarks().get(i).getLandmarkList(),result.multiHandedness().get(i).getLabel().equals("Left"),canvas,width,height);drawClassificationOnCanvas(result.multiHandLandmarks().get(i).getLandmarkList(),canvas);}}/** Updates the image view with the latest {@link HandsResult}. */public void update() {postInvalidate();if (latest != null) {setImageBitmap(latest);}}private void drawClassificationOnCanvas(List<NormalizedLandmark> handLandmarkList,Canvas canvas) {String resstr = handDetection(handLandmarkList);Paint classificationPaint = new Paint();classificationPaint.setColor(Color.parseColor("#c75450"));classificationPaint.setStrokeWidth(12);classificationPaint.setTextSize(100);classificationPaint.setStyle(Paint.Style.FILL);System.out.println("----------printText");canvas.drawText(resstr,10,100,classificationPaint);}private void drawLandmarksOnCanvas(List<NormalizedLandmark> handLandmarkList,boolean isLeftHand,Canvas canvas,int width,int height) {// Draw connections.
//        画线for (Hands.Connection c : Hands.HAND_CONNECTIONS) {Paint connectionPaint = new Paint();connectionPaint.setColor(isLeftHand ? LEFT_HAND_CONNECTION_COLOR : RIGHT_HAND_CONNECTION_COLOR);connectionPaint.setStrokeWidth(CONNECTION_THICKNESS);NormalizedLandmark start = handLandmarkList.get(c.start());NormalizedLandmark end = handLandmarkList.get(c.end());canvas.drawLine(start.getX() * width,start.getY() * height,end.getX() * width,end.getY() * height,connectionPaint);}
//        画点 红点Paint landmarkPaint = new Paint();landmarkPaint.setColor(isLeftHand ? LEFT_HAND_LANDMARK_COLOR : RIGHT_HAND_LANDMARK_COLOR);// Draws landmarks.for (NormalizedLandmark landmark : handLandmarkList) {canvas.drawCircle(landmark.getX() * width, landmark.getY() * height, LANDMARK_RADIUS, landmarkPaint);}// Draws hollow circles around landmarks.
//        画圈，红点上的圈圈landmarkPaint.setColor(isLeftHand ? LEFT_HAND_HOLLOW_CIRCLE_COLOR : RIGHT_HAND_HOLLOW_CIRCLE_COLOR);landmarkPaint.setStrokeWidth(HOLLOW_CIRCLE_WIDTH);landmarkPaint.setStyle(Paint.Style.STROKE);for (NormalizedLandmark landmark : handLandmarkList) {canvas.drawCircle(landmark.getX() * width,landmark.getY() * height,LANDMARK_RADIUS + HOLLOW_CIRCLE_WIDTH,landmarkPaint);}}//    手势检测private String handDetection(List<NormalizedLandmark> handLandmarkList){//        从拇指开始是one，two这样List<Boolean> resultList=new ArrayList<>();
//        写字判断类别：/*计算拇指是否弯曲计算第四个点到第17点距离小于第5点到17点距离*/float seventhreenx=handLandmarkList.get(17).getX();float seventhreeny=handLandmarkList.get(17).getY();float seventhreenz=handLandmarkList.get(17).getZ();float fourx=handLandmarkList.get(4).getX();float foury=handLandmarkList.get(4).getY();float fourz=handLandmarkList.get(4).getZ();float fivex=handLandmarkList.get(5).getX();float fivey=handLandmarkList.get(5).getY();float fivez=handLandmarkList.get(5).getZ();float distance4=(fourx-seventhreenx)*(fourx-seventhreenx)+(foury-seventhreeny)*(foury-seventhreeny)+(fourz-seventhreenz)*(fourz-seventhreenz);float distance5=(fivex-seventhreenx)*(fivex-seventhreenx)+(fivey-seventhreeny)*(fivey-seventhreeny)+(fivez-seventhreenz)*(fivez-seventhreenz);if(distance5-distance4>0){//            有弯曲resultList.add(true);}else{resultList.add(false);
//            没有弯曲}/*计算四个手指是否弯曲手指的指尖距离大于关节距离*/// 定义0点坐标zerox,zeroy,zerozfloat zerox=handLandmarkList.get(0).getX();float zeroy=handLandmarkList.get(0).getY();float zeroz=handLandmarkList.get(0).getZ();//该遍历是:(6,8),(10,12),(14,16),(18,20)int[] intarr=new int[]{6,8,10,12,14,16,18,20};for(int i =0;i<4;i++){//0,1,2,3,,取i,i+1),2i,2i+1float closex = handLandmarkList.get(intarr[2*i]).getX();float closey = handLandmarkList.get(intarr[2*i]).getY();float closez = handLandmarkList.get(intarr[2*i]).getZ();float farx = handLandmarkList.get(intarr[2*i+1]).getX();float fary = handLandmarkList.get(intarr[2*i+1]).getY();float farz = handLandmarkList.get(intarr[2*i+1]).getZ();//取出点坐标与0点求欧式距离float close_distance=(closex-zerox)*(closex-zerox)+(closey-zeroy)*(closey-zeroy)+(closez-zeroz)*(closez-zeroz);float far_distance=(farx-zerox)*(farx-zerox)+(fary-zeroy)*(fary-zeroy)+(farz-zeroz)*(farz-zeroz);float between =close_distance- far_distance  ;float zero=0;if(between>zero){//弯曲resultList.add(true);}else{//  没有弯曲resultList.add(false);}}String code="";for(boolean b :resultList){if(b){code+="1";}else{code=code+"0";}}String res="";switch (code){case "11111":res="数字0/拳头";break;case "10111":res="数字1";break;case "10011":res="数字2/剪刀";break;case "10001":res="数字3";break;case "10000":res="数字4";break;case "00000":res="数字5";break;case "01110":res="数字6";break;case "00111":res="数字7";break;case "00011":res="数字8";break;case "11011":res="国际友好手势";break;case "11000":res="OK";break;default:res="none";break;}return res;}
}