TermApp/app/src/main/java/com/xinyingpower/microphoto/MainActivity.java

package com.xinyingpower.microphoto;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.os.Build;
import android.os.Environment;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import com.dowse.camera.client.DSCameraManager;
import com.xinyingpower.microphoto.databinding.ActivityMainBinding;

import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity {

    private static int MY_PERMISSIONS_REQUEST_FOREGROUND_SERVICE = 100;

    // Used to load the 'microphoto' library on application startup.
    static {
        System.loadLibrary("microphoto");
    }

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        this.binding.start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                String[] accessPermissions = new String[] {
                        Manifest.permission.CAMERA,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        Manifest.permission.FOREGROUND_SERVICE
                };
                boolean needRequire  = false;
                for(String access : accessPermissions) {
                    int curPermission = ActivityCompat.checkSelfPermission(MainActivity.this, access);
                    if(curPermission != PackageManager.PERMISSION_GRANTED) {
                        needRequire = true;
                        break;
                    }
                }
                if (needRequire) {
                    ActivityCompat.requestPermissions(
                            MainActivity.this,
                            accessPermissions,
                            MY_PERMISSIONS_REQUEST_FOREGROUND_SERVICE);
                    return;
                }

                int channel = 2;
                String path = buildPhotoDir(channel);
                String fileName = buildPhotoFileName(channel, 255);
                // MainActivity.this.takePhoto(channel, 255, path, fileName);

                Intent intent = new Intent(MainActivity.this, MicroPhotoService.class);
                intent.setAction(MicroPhotoService.ACTION_START);

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    MainActivity.this.startForegroundService(intent);
                } else {
                    MainActivity.this.startService(intent);
                }

                binding.start.setEnabled(false);
                binding.stop.setEnabled(true);

            }


        });

        this.binding.stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent = new Intent(MainActivity.this, MicroPhotoService.class);
                intent.setAction(MicroPhotoService.ACTION_STOP);

                MainActivity.this.stopService(intent);

                binding.start.setEnabled(true);
                binding.stop.setEnabled(false);
            }


        });

        Handler handler=new Handler();
        Runnable runnable=new Runnable(){
            @Override
            public void run() {
                binding.start.performClick();
            }
        };
        handler.postDelayed(runnable, 2000);

    }

    protected  void takePhoto()
    {
        File path = Environment.getExternalStorageDirectory();
        File file = new File(path, "photo.jpg");
        boolean res = false;

        res = DSCameraManager.getInstace().init();

        res = DSCameraManager.getInstace().takePhoto(file.getAbsolutePath(), 2);

        if (!res)
        {
            int aa = 0;
        }

        res = DSCameraManager.getInstace().unInit();

    }

    String buildPhotoDir(int channel) {
        File path = new File(Environment.getExternalStorageDirectory(), "com.xinyingpower.com/photos/");

        if (!path.exists() && !path.mkdirs()) {
            return null;
        }
        String p = path.getAbsolutePath();
        if (!p.endsWith(File.separator)) {
            p += File.separator;
        }
        return p;
    }

    String buildPhotoFileName(int channel, int preset) {

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
        String date = dateFormat.format(new Date());
        String photoFile = "img_" + Integer.toString(channel) + "_" + Integer.toHexString(preset).toUpperCase() + "_" + date + ".jpg";
        return photoFile;

    }

    private void takePhoto(int aa) {

        System.out.println("Preparing to take photo");
        Camera camera = null;

        int cameraCount = 0;

        Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
        cameraCount = Camera.getNumberOfCameras();
        for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
            SystemClock.sleep(1000);

            Camera.getCameraInfo(camIdx, cameraInfo);

            try {
                camera = Camera.open(camIdx);
            } catch (RuntimeException e) {
                System.out.println("Camera not available: " + camIdx);
                camera = null;
                //e.printStackTrace();
            }
            try {
                if (null == camera) {
                    System.out.println("Could not get camera instance");
                } else {
                    System.out.println("Got the camera, creating the dummy surface texture");
                    //SurfaceTexture dummySurfaceTextureF = new SurfaceTexture(0);
                    try {
                        //camera.setPreviewTexture(dummySurfaceTextureF);
                        camera.setPreviewTexture(new SurfaceTexture(0));
                        camera.startPreview();
                    } catch (Exception e) {
                        System.out.println("Could not set the surface preview texture");
                        e.printStackTrace();
                    }
                    camera.takePicture(null, null, new Camera.PictureCallback() {

                        @Override
                        public void onPictureTaken(byte[] data, Camera camera) {

                            File path = getApplicationContext().getFilesDir();
                            // String appPath = path.getAbsolutePath();

                            File pictureFileDir = path;
                            if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
                                return;
                            }
                            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
                            String date = dateFormat.format(new Date());
                            String photoFile = "PictureFront_" + "_" + date + ".jpg";
                            String filename = pictureFileDir.getPath() + File.separator + photoFile;
                            File mainPicture = new File(filename);
                            // addImageFile(mainPicture);

                            try {
                                FileOutputStream fos = new FileOutputStream(mainPicture);
                                fos.write(data);
                                fos.close();
                                System.out.println("image saved");
                            } catch (Exception error) {
                                System.out.println("Image could not be saved");
                            }
                            camera.release();
                        }
                    });
                }
            } catch (Exception e) {
                camera.release();
            }


        }
    }


    /**
     * A native method that is implemented by the 'microphoto' native library,
     * which is packaged with this application.
     */
    public native String stringFromJNI();

    public native boolean takePhoto(int channel, int preset, String path, String fileName);
}