android camera2 example class wrapper

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TextureView textureView=(TextureView)findViewById(R.id.textureView);
    camera2Wrapper=new Camera2Wrapper(this,textureView);
}


@Overrideprotected void onPause() {
    // TODO Auto-generated method stub    super.onPause();
   camera2Wrapper.closeCameraDevice();
}

//Camera2Wrapper.java

package com.xchat.stevenzack.spycamera;

/** * Created by steven on 17-6-15. */import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraMetadata;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.Image;
import android.media.ImageReader;
import android.os.Handler;
import android.os.HandlerThread;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.util.Size;
import android.view.Surface;
import android.view.TextureView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static android.content.Context.CONTEXT_INCLUDE_CODE;

/** * Created by steven on 17-6-15. */
public class Camera2Wrapper {
    private final static String TAG = "Camera2testJ";
    private TextureView mTextureView;
    private CameraDevice mCameraDevice;
    private CaptureRequest.Builder mPreviewBuilder;
    private CameraCaptureSession mPreviewSession;
    private Size mPreviewSize;
    private int cameraFacing;
    private Context context;
    private Handler mbackgroundHandler;
    public Camera2Wrapper(Context context,TextureView textureView,int cameraID){
        this.context=context;
        mTextureView=textureView;
        mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
        cameraFacing=cameraID;
    }
    public void openCamera(int i) {

        CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
        Log.e(TAG, "openCamera E");
        int[] faingMap=new int[]{CameraCharacteristics.LENS_FACING_BACK,CameraCharacteristics.LENS_FACING_FRONT};
        try {
            String mCameraId=manager.getCameraIdList()[0];
            for(final String cameraId : manager.getCameraIdList()){
                CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
                int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
                if(cOrientation == faingMap[i]) mCameraId= cameraId;
            }
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
            StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
            mPreviewSize = map.getOutputSizes(SurfaceTexture.class)[0];

            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            manager.openCamera(mCameraId, mStateCallback, null);
        } catch (CameraAccessException e) {
            // TODO Auto-generated catch block            e.printStackTrace();
        }
        Log.e(TAG, "openCamera X");
    }

    private TextureView.SurfaceTextureListener mSurfaceTextureListener = new TextureView.SurfaceTextureListener(){

        @Override        public void onSurfaceTextureAvailable(SurfaceTexture surface,
                                              int width, int height) {
            // TODO Auto-generated method stub            Log.e(TAG, "onSurfaceTextureAvailable, width="+width+",height="+height);
            openCamera(cameraFacing);
        }

        @Override        public void onSurfaceTextureSizeChanged(SurfaceTexture surface,
                                                int width, int height) {
            // TODO Auto-generated method stub            Log.e(TAG, "onSurfaceTextureSizeChanged");
        }

        @Override        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
            // TODO Auto-generated method stub            return false;
        }

        @Override        public void onSurfaceTextureUpdated(SurfaceTexture surface) {
            // TODO Auto-generated method stub            Log.e(TAG, "onSurfaceTextureUpdated");
        }

    };

    private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {

        @Override        public void onOpened(CameraDevice camera) {
            // TODO Auto-generated method stub            Log.e(TAG, "onOpened");
            mCameraDevice = camera;
            startPreview();
        }

        @Override        public void onDisconnected(CameraDevice camera) {
            // TODO Auto-generated method stub            Log.e(TAG, "onDisconnected");
        }

        @Override        public void onError(CameraDevice camera, int error) {
            // TODO Auto-generated method stub            Log.e(TAG, "onError");
        }

    };


    private void startPreview() {
        // TODO Auto-generated method stub        if(null == mCameraDevice || !mTextureView.isAvailable() || null == mPreviewSize) {
            Log.e(TAG, "startPreview fail, return");
        }

        SurfaceTexture texture = mTextureView.getSurfaceTexture();
        if(null == texture) {
            Log.e(TAG,"texture is null, return");
            return;
        }

        texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
        Surface surface = new Surface(texture);

        try {
            mPreviewBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        } catch (CameraAccessException e) {
            // TODO Auto-generated catch block            e.printStackTrace();
        }
        mPreviewBuilder.addTarget(surface);

        try {
            mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {

                @Override                public void onConfigured(CameraCaptureSession session) {
                    // TODO Auto-generated method stub                    mPreviewSession = session;
                    updatePreview();
                }

                @Override                public void onConfigureFailed(CameraCaptureSession session) {
                    // TODO Auto-generated method stub                    Toast.makeText(context, "onConfigureFailed", Toast.LENGTH_LONG).show();
                }
            }, null);
        } catch (CameraAccessException e) {
            // TODO Auto-generated catch block            e.printStackTrace();
        }
    }

    private void updatePreview() {
        // TODO Auto-generated method stub        if(null == mCameraDevice) {
            Log.e(TAG, "updatePreview error, return");
        }

        mPreviewBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
        HandlerThread thread = new HandlerThread("CameraPreview");
        thread.start();
        mbackgroundHandler = new Handler(thread.getLooper());

        try {
            mPreviewSession.setRepeatingRequest(mPreviewBuilder.build(), null, mbackgroundHandler);
        } catch (CameraAccessException e) {
            // TODO Auto-generated catch block            e.printStackTrace();
        }
    }
    public void closeCameraDevice(){
        if (null != mCameraDevice) {
            mCameraDevice.close();
            mCameraDevice = null;
        }
    }


    protected void takePictureAndSaveIt(String storagePath, int mRotaion, final CameraCaptureSession.CaptureCallback captureListener) {
        if(null == mCameraDevice) {
            Log.e(TAG, "cameraDevice is null");
            return;
        }
        CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
        try {
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraDevice.getId());
            Size[] jpegSizes = null;
            if (characteristics != null) {
                jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).getOutputSizes(ImageFormat.JPEG);
            }
            int width = 640;
            int height = 480;
            if (jpegSizes != null && 0 < jpegSizes.length) {
                width = jpegSizes[0].getWidth();
                height = jpegSizes[0].getHeight();
            }
            ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
            List<Surface> outputSurfaces = new ArrayList<Surface>(2);
            outputSurfaces.add(reader.getSurface());
            outputSurfaces.add(new Surface(mTextureView.getSurfaceTexture()));
            final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            captureBuilder.addTarget(reader.getSurface());
            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
            // Orientation            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, mRotaion);
            final File file = new File(storagePath);
            ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
                @Override                public void onImageAvailable(ImageReader reader) {
                    Image image = null;
                    try {
                        image = reader.acquireLatestImage();
                        ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                        byte[] bytes = new byte[buffer.capacity()];
                        buffer.get(bytes);
                        save(bytes);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        if (image != null) {
                            image.close();
                        }
                    }
                }
                private void save(byte[] bytes) throws IOException {
                    OutputStream output = null;
                    try {
                        output = new FileOutputStream(file);
                        output.write(bytes);
                        output.flush();
                    } finally {
                        if (null != output) {
                            output.close();
                        }
                    }
                }
            };
            reader.setOnImageAvailableListener(readerListener,mbackgroundHandler );
            mCameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
                @Override                public void onConfigured(CameraCaptureSession session) {
                    try {
                        session.capture(captureBuilder.build(), captureListener, mbackgroundHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
                @Override                public void onConfigureFailed(CameraCaptureSession session) {
                }
            }, mbackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
    protected void takePicture(int mRotaion, final onBitmapGetListener onBitmapGetListener ) {
        if(null == mCameraDevice) {
            Log.e(TAG, "cameraDevice is null");
            return;
        }
        CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
        try {
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraDevice.getId());
            Size[] jpegSizes = null;
            if (characteristics != null) {
                jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).getOutputSizes(ImageFormat.JPEG);
            }
            int width = 640;
            int height = 480;
            if (jpegSizes != null && 0 < jpegSizes.length) {
                width = jpegSizes[0].getWidth();
                height = jpegSizes[0].getHeight();
            }
            ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
            List<Surface> outputSurfaces = new ArrayList<Surface>(2);
            outputSurfaces.add(reader.getSurface());
            outputSurfaces.add(new Surface(mTextureView.getSurfaceTexture()));
            final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            captureBuilder.addTarget(reader.getSurface());
            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
            // Orientation            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, mRotaion);

            final Bitmap[] bitmap=new Bitmap[1];

            ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
                @Override                public void onImageAvailable(ImageReader reader) {
                    Image image = null;
                    image = reader.acquireLatestImage();
                    ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                    byte[] bytes = new byte[buffer.capacity()];
                    buffer.get(bytes);
                    bitmap[0]=BitmapFactory.decodeByteArray(bytes,0,bytes.length);
                    image.close();
                }
            };
            reader.setOnImageAvailableListener(readerListener,mbackgroundHandler );
            final CameraCaptureSession.CaptureCallback captureListener =new CameraCaptureSession.CaptureCallback() {
                @Override                public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
                    super.onCaptureCompleted(session, request, result);
                    onBitmapGetListener.onBitmapGet(bitmap[0]);
                }
            };
            mCameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
                @Override                public void onConfigured(CameraCaptureSession session) {
                    try {
                        session.capture(captureBuilder.build(), captureListener, mbackgroundHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
                @Override                public void onConfigureFailed(CameraCaptureSession session) {
                }
            }, mbackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
    public interface onBitmapGetListener{
        void onBitmapGet(Bitmap bitmap);
    }
    private String getFrontFacingCameraId(CameraManager cManager) throws CameraAccessException {
        for(final String cameraId : cManager.getCameraIdList()){
            CameraCharacteristics characteristics = cManager.getCameraCharacteristics(cameraId);
            int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
            if(cOrientation == CameraCharacteristics.LENS_FACING_FRONT) return cameraId;
        }
        return null;
    }
    private String getBackFacingCameraId(CameraManager cManager) throws CameraAccessException {
        for(final String cameraId : cManager.getCameraIdList()){
            CameraCharacteristics characteristics = cManager.getCameraCharacteristics(cameraId);
            int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
            if(cOrientation == CameraCharacteristics.LENS_FACING_BACK) return cameraId;
        }
        return null;
    }
}