Android 使用Camera2 实现拍照录像的功能

职场小白迷上优美句子:

还是电影  《无问西东》中的台词，这句有点感人：

沈光耀的妈妈对沈光耀说："当初你离家千里，来到这个地方读书，你父亲和我都没有反对过，因为，是我们想你，能享受到人生的乐趣，比如读万卷书行万里路，比如同你喜欢的女孩子结婚生子。注意不是给我增添子孙，而是你自己，能够享受为人父母的乐趣，你一生所要追求的功名利禄，没有什么是你的祖上没经历过的，那些只不过是人生的幻光。我怕，你还没想好怎么过这一生，你的命就没了啊！"
 

这个是效果图:

推荐一个写的很不错的博客  作者:  新根 - - - Android Camera2 API和拍照与录像过程

另外一个后来发现的：https://blog.csdn.net/qq_21898059/article/details/50986290

------------------------------ Main2Activity ----------------------------

package com.example.phonecamera2demo;

import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity implements View.OnClickListener {

    private AutoFitTextureView mTextureview;

    private Button mTakePictureBtn;//拍照
    private Button mVideoRecodeBtn;//开始录像
    private LinearLayout mVerticalLinear;
    private Button mTakePictureBtn2;//拍照 横,竖屏状态分别设置了一个拍照,录像的按钮
    private Button mVideoRecodeBtn2;//开始录像
    private LinearLayout mHorizontalLinear;
    private Button mVHScreenBtn;
    private CameraController mCameraController;
    private boolean mIsRecordingVideo; //开始停止录像
    public static String BASE_PATH = Environment.getExternalStorageDirectory() + "/AAA";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);// 设置全屏
        setContentView(R.layout.activity_main2);

    }

    @Override
    protected void onResume() {
        super.onResume();
        //获取相机管理类的实例
        mCameraController = CameraController.getmInstance(this);
        mCameraController.setFolderPath(BASE_PATH);

        initView();
        //判断当前横竖屏状态
        if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            mVHScreenBtn.setText("切换为竖屏");
        } else {
            mVHScreenBtn.setText("切换为横屏");

        }
    }

    private void initView() {
        mTextureview = (AutoFitTextureView) findViewById(R.id.textureview);
        mTakePictureBtn = (Button) findViewById(R.id.take_picture_btn);
        mTakePictureBtn.setOnClickListener(this);
        mVideoRecodeBtn = (Button) findViewById(R.id.video_recode_btn);
        mVideoRecodeBtn.setOnClickListener(this);
        mVerticalLinear = (LinearLayout) findViewById(R.id.vertical_linear);
        mTakePictureBtn2 = (Button) findViewById(R.id.take_picture_btn2);
        mTakePictureBtn2.setOnClickListener(this);
        mVideoRecodeBtn2 = (Button) findViewById(R.id.video_recode_btn2);
        mVideoRecodeBtn2.setOnClickListener(this);
        mHorizontalLinear = (LinearLayout) findViewById(R.id.horizontal_linear);
        mVHScreenBtn = (Button) findViewById(R.id.v_h_screen_btn);
        mVHScreenBtn.setOnClickListener(this);

        //判断当前屏幕方向
        if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            //竖屏时
            mHorizontalLinear.setVisibility(View.VISIBLE);
            mVerticalLinear.setVisibility(View.GONE);
        } else {
            //横屏时
            mVerticalLinear.setVisibility(View.VISIBLE);
            mHorizontalLinear.setVisibility(View.GONE);
        }
        mCameraController.InitCamera(mTextureview);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            default:
                break;
            case R.id.take_picture_btn:
                mCameraController.takePicture();
                break;
            case R.id.video_recode_btn:
                if (mIsRecordingVideo) {
                    mIsRecordingVideo = !mIsRecordingVideo;
                    mCameraController.stopRecordingVideo();
                    mVideoRecodeBtn.setText("开始录像");
                    mVideoRecodeBtn2.setText("开始录像");
                    Toast.makeText(this, "录像结束", Toast.LENGTH_SHORT).show();
                } else {
                    mVideoRecodeBtn.setText("停止录像");
                    mVideoRecodeBtn2.setText("停止录像");
                    mIsRecordingVideo = !mIsRecordingVideo;
                    mCameraController.startRecordingVideo();
                    Toast.makeText(this, "录像开始", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.take_picture_btn2:
                mCameraController.takePicture();
                break;
            case R.id.video_recode_btn2:
                if (mIsRecordingVideo) {
                    mIsRecordingVideo = !mIsRecordingVideo;
                    mCameraController.stopRecordingVideo();
                    mVideoRecodeBtn.setText("开始录像");
                    mVideoRecodeBtn2.setText("开始录像");
                    Toast.makeText(this, "录像结束", Toast.LENGTH_SHORT).show();
                } else {
                    mVideoRecodeBtn.setText("停止录像");
                    mVideoRecodeBtn2.setText("停止录像");
                    mIsRecordingVideo = !mIsRecordingVideo;
                    mCameraController.startRecordingVideo();
                    Toast.makeText(this, "录像开始", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.v_h_screen_btn:
                //判断当前屏幕方向
                if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
                    //切换竖屏
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                    Toast.makeText(Main2Activity.this, "竖屏了", Toast.LENGTH_SHORT).show();
                } else {
                    //切换横屏
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                    Toast.makeText(Main2Activity.this, "横屏了", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
}

------------------------- activity_main2.xml ---------------------------

------------------------ AutoFitTextureView ----------------------

package com.example.zhuoshicarreco.camera;

import android.content.Context;
import android.util.AttributeSet;
import android.view.TextureView;


public class AutoFitTextureView extends TextureView {

    private int mRatioWidth = 0;
    private int mRatioHeight = 0;

    public AutoFitTextureView(Context context) {
        this(context, null);
    }

    public AutoFitTextureView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    /**
     * @param width  Relative horizontal size
     * @param height Relative vertical size
     */
    public void setAspectRatio(int width, int height) {
        if (width < 0 || height < 0) {
            throw new IllegalArgumentException("Size cannot be negative.");
        }
        mRatioWidth = width;
        mRatioHeight = height;
        requestLayout();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);
        if (0 == mRatioWidth || 0 == mRatioHeight) {
            setMeasuredDimension(width, height);
        } else {
            if (width < height * mRatioWidth / mRatioHeight) {
                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
            } else {
                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
            }
        }
    }

}

------------------------ CameraController--------------------------

package com.example.vehicleIllegalInspection.camera;


import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.RectF;
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.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.Image;
import android.media.ImageReader;
import android.media.MediaRecorder;
import android.os.Handler;
import android.os.HandlerThread;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.Size;
import android.util.SparseIntArray;
import android.view.Surface;
import android.view.TextureView;
import android.widget.Toast;

import com.example.vehicleIllegalInspection.mvp.ui.activity.MainActivity;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class CameraController {

    private static final String TAG = "CameraController";
    private static Activity mActivity;
    private String mFolderPath; //保存视频,图片的文件夹路径
    private ImageReader mImageReader;
    private HandlerThread mBackgroundThread;
    private Handler mBackgroundHandler;
    private AutoFitTextureView mTextureView;
    private Semaphore mCameraOpenCloseLock = new Semaphore(1);//一个信号量以防止应用程序在关闭相机之前退出。
    private String mCameraId;//当前相机的ID。
    private CameraDevice mCameraDevice;
    private Size mPreviewSize;
    private CaptureRequest.Builder mPreviewRequestBuilder;
    private CameraCaptureSession mCaptureSession;
    private CaptureRequest mPreviewRequest;
    private File mFile;//拍照储存文件
    private Integer mSensorOrientation;
    private CameraCaptureSession mPreviewSession;
    private CaptureRequest.Builder mPreviewBuilder;

    private static final int MAX_PREVIEW_WIDTH = 1920;//Camera2 API保证的最大预览宽度

    private static final int MAX_PREVIEW_HEIGHT = 1080;//Camera2 API保证的最大预览高度

    private boolean mFlashSupported;
    private int mState = STATE_PREVIEW;
    private static final SparseIntArray ORIENTATIONS = new SparseIntArray();

    static {
        ORIENTATIONS.append(Surface.ROTATION_0, 90);
        ORIENTATIONS.append(Surface.ROTATION_90, 0);
        ORIENTATIONS.append(Surface.ROTATION_180, 270);
        ORIENTATIONS.append(Surface.ROTATION_270, 180);
    }

    private static final int SENSOR_ORIENTATION_DEFAULT_DEGREES = 90;
    private static final int SENSOR_ORIENTATION_INVERSE_DEGREES = 270;
    private static final int STATE_PREVIEW = 0;//相机状态：显示相机预览。
    private static final int STATE_WAITING_LOCK = 1;//相机状态：等待焦点被锁定。
    private static final int STATE_WAITING_PRECAPTURE = 2;//等待曝光被Precapture状态。
    private static final int STATE_WAITING_NON_PRECAPTURE = 3;//相机状态：等待曝光的状态是不是Precapture。
    private static final int STATE_PICTURE_TAKEN = 4;//相机状态：拍照。
    private MediaRecorder mMediaRecorder;
    private String mNextVideoAbsolutePath;



    private CameraController() {

    }

    private static class ClassHolder {
        static CameraController mInstance = new CameraController();

    }

    public static CameraController getmInstance(Activity activity) {
        mActivity = activity;
        return ClassHolder.mInstance;
    }

    public void InitCamera(AutoFitTextureView textureView) {
        this.mTextureView = textureView;
        startBackgroundThread();
        if (mTextureView.isAvailable()) {
            openCamera(mTextureView.getWidth(), mTextureView.getHeight());
        } else {
            mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
        }
    }

    /**
     * 设置需要保存文件的文件夹路径
     * @param path
     */
    public void setFolderPath(String path) {
        this.mFolderPath = path;
        File mFolder = new File(path);
        if (!mFolder.exists()) {
            mFolder.mkdirs();
            Log.d(TAG, "文件夹不存在去创建");
        } else {
            Log.d(TAG, "文件夹已创建");
        }
    }

    public String getFolderPath() {
        return mFolderPath;
    }

    /**
     * 拍照
     */
    public void takePicture() {
        lockFocus();
    }

    /**
     * 开始录像
     */
    public void startRecordingVideo() {

        if (null == mCameraDevice || !mTextureView.isAvailable() || null == mPreviewSize) {
            return;
        }
        try {
            closePreviewSession();
            setUpMediaRecorder();
            SurfaceTexture texture = mTextureView.getSurfaceTexture();
            assert texture != null;
            texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
            mPreviewBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
            List surfaces = new ArrayList<>();

            //为相机预览设置曲面
            Surface previewSurface = new Surface(texture);
            surfaces.add(previewSurface);
            mPreviewBuilder.addTarget(previewSurface);

            //设置MediaRecorder的表面
            Surface recorderSurface = mMediaRecorder.getSurface();
            surfaces.add(recorderSurface);
            mPreviewBuilder.addTarget(recorderSurface);

            // 启动捕获会话
            // 一旦会话开始，我们就可以更新UI并开始录制
            mCameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {

                @Override
                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                    mPreviewSession = cameraCaptureSession;
                    updatePreview();
                    mActivity.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            //开启录像
                            mMediaRecorder.start();
                        }
                    });
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {


                }
            }, mBackgroundHandler);
        } catch (CameraAccessException | IOException e) {
            e.printStackTrace();
        }

    }

    /**
     * 停止录像
     */
    public void stopRecordingVideo() {

        mMediaRecorder.stop();
        mMediaRecorder.reset();
        mNextVideoAbsolutePath = null;
        startPreview();
    }

    private void closePreviewSession() {
        if (mPreviewSession != null) {
            mPreviewSession.close();
            mPreviewSession = null;
        }
    }

    private void setUpMediaRecorder() throws IOException {

        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //设置用于录制的音源
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);//开始捕捉和编码数据到setOutputFile（指定的文件）
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); //设置在录制过程中产生的输出文件的格式
        if (mNextVideoAbsolutePath == null || mNextVideoAbsolutePath.isEmpty()) {
            mNextVideoAbsolutePath = getVideoFilePath();
        }
        mMediaRecorder.setOutputFile(mNextVideoAbsolutePath);//设置输出文件的路径
        mMediaRecorder.setVideoEncodingBitRate(10000000);//设置录制的视频编码比特率
        mMediaRecorder.setVideoFrameRate(25);//设置要捕获的视频帧速率
        mMediaRecorder.setVideoSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());//设置要捕获的视频的宽度和高度
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);//设置视频编码器，用于录制
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);//设置audio的编码格式
        int rotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
        Log.d(TAG, "setUpMediaRecorder: "+rotation);


        switch (mSensorOrientation) {
            case SENSOR_ORIENTATION_DEFAULT_DEGREES:
                mMediaRecorder.setOrientationHint(ORIENTATIONS.get(rotation));
                break;
            case SENSOR_ORIENTATION_INVERSE_DEGREES:
                mMediaRecorder.setOrientationHint(ORIENTATIONS.get(rotation));
                break;
        }
        mMediaRecorder.prepare();
    }

    private String getVideoFilePath() {

        return getFolderPath() + "/" + System.currentTimeMillis() + ".mp4";
    }

    private void updatePreview() {
        if (null == mCameraDevice) {
            return;
        }
        try {
            mPreviewBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
            HandlerThread thread = new HandlerThread("CameraPreview");
            thread.start();
            mPreviewSession.setRepeatingRequest(mPreviewBuilder.build(), null, mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void lockFocus() {

        //创建文件
        mFile = new File(getFolderPath() + "/" + getNowDate() + ".jpg");
        try {

            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_START);

            mState = STATE_WAITING_LOCK;
            mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                    mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取当前时间,用来给文件夹命名
     */
    private String getNowDate() {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return simpleDateFormat.format(new Date());
    }

    private TextureView.SurfaceTextureListener mSurfaceTextureListener
            = new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
            openCamera(width, height);
        }

        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

        }

        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
            return false;
        }

        @Override
        public void onSurfaceTextureUpdated(SurfaceTexture surface) {

        }
    };

    private void startBackgroundThread() {
        mBackgroundThread = new HandlerThread("CameraBackground");
        mBackgroundThread.start();
        mBackgroundHandler = new Handler(mBackgroundThread.getLooper());

    }

    /**
     * 开启相机
     */
    private void openCamera(int width, int height) {
        //设置相机输出
        setUpCameraOutputs(width, height);
        //配置变换
        configureTransform(width, height);
        CameraManager manager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
        try {
            if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
                throw new RuntimeException("Time out waiting to lock camera opening.");
            }

            if (ActivityCompat.checkSelfPermission(mActivity, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

                return;
            }
            //打开相机预览
            manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);


        } catch (CameraAccessException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
        }
    }

    /**
     * CameraDevice状态更改时被调用。
     */
    private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {

        @Override
        public void onOpened(@NonNull CameraDevice cameraDevice) {
            // 打开相机时调用此方法。 在这里开始相机预览。
            mCameraOpenCloseLock.release();
            mCameraDevice = cameraDevice;
            //创建CameraPreviewSession
            startPreview();
        }

        @Override
        public void onDisconnected(@NonNull CameraDevice cameraDevice) {
            mCameraOpenCloseLock.release();
            cameraDevice.close();
            mCameraDevice = null;
        }

        @Override
        public void onError(@NonNull CameraDevice cameraDevice, int error) {
            mCameraOpenCloseLock.release();
            cameraDevice.close();
            mCameraDevice = null;
            mActivity.finish();
        }

    };

    /**
     * 为相机预览创建新的CameraCaptureSession
     */
    private void startPreview() {
        try {
            SurfaceTexture texture = mTextureView.getSurfaceTexture();
            assert texture != null;


            // 将默认缓冲区的大小配置为我们想要的相机预览的大小。 设置分辨率
            texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());

            // 预览的输出Surface。
            Surface surface = new Surface(texture);

            //设置了一个具有输出Surface的CaptureRequest.Builder。
            mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            mPreviewRequestBuilder.addTarget(surface);

            //创建一个CameraCaptureSession来进行相机预览。
            mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
                    new CameraCaptureSession.StateCallback() {

                        @Override
                        public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                            // 相机已经关闭
                            if (null == mCameraDevice) {
                                return;
                            }

                            // 会话准备好后，我们开始显示预览
                            mCaptureSession = cameraCaptureSession;
                            // 自动对焦应
                            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                                    CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

                            // 最终开启相机预览并添加事件
                            mPreviewRequest = mPreviewRequestBuilder.build();
                            try {
                                mCaptureSession.setRepeatingRequest(mPreviewRequest,
                                        mCaptureCallback, mBackgroundHandler);
                            } catch (CameraAccessException e) {
                                e.printStackTrace();
                            }
                        }

                        @Override
                        public void onConfigureFailed(
                                @NonNull CameraCaptureSession cameraCaptureSession) {

                        }
                    }, null
            );
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    /**
     * 处理与JPEG捕获有关的事件
     */
    private CameraCaptureSession.CaptureCallback mCaptureCallback
            = new CameraCaptureSession.CaptureCallback() {

        //处理
        private void process(CaptureResult result) {
            switch (mState) {
                case STATE_PREVIEW: {
                    //预览状态
                    break;
                }

                case STATE_WAITING_LOCK: {
                    //等待对焦
                    Integer afState = result.get(CaptureResult.CONTROL_AF_STATE);
                    if (afState == null) {
                        captureStillPicture();
                    } else if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState ||
                            CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) {
                        // 某些设备上的控制状态可以为空
                        Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                        if (aeState == null || aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
                            mState = STATE_PICTURE_TAKEN;
                            captureStillPicture();
                        } else {
                            runPrecaptureSequence();
                        }
                    }
                    break;
                }
                case STATE_WAITING_PRECAPTURE: {
                    //某些设备上的控制状态可以为空
                    Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                    if (aeState == null ||
                            aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE ||
                            aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED) {
                        mState = STATE_WAITING_NON_PRECAPTURE;
                    }
                    break;
                }
                case STATE_WAITING_NON_PRECAPTURE: {
                    // CONTROL_AE_STATE can be null on some devices
                    Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                    if (aeState == null || aeState != CaptureResult.CONTROL_AE_STATE_PRECAPTURE) {
                        mState = STATE_PICTURE_TAKEN;
                        captureStillPicture();
                    }
                    break;
                }
            }
        }

        @Override
        public void onCaptureProgressed(@NonNull CameraCaptureSession session,
                                        @NonNull CaptureRequest request,
                                        @NonNull CaptureResult partialResult) {
            process(partialResult);
        }

        @Override
        public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                       @NonNull CaptureRequest request,
                                       @NonNull TotalCaptureResult result) {
            process(result);
        }

    };
    /**
     * 拍摄静态图片。
     */
    private void captureStillPicture() {


        try {
            if (null == mCameraDevice) {
                return;
            }
            // 这是用来拍摄照片的CaptureRequest.Builder。
            final CaptureRequest.Builder captureBuilder =
                    mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            captureBuilder.addTarget(mImageReader.getSurface());

            // 使用相同的AE和AF模式作为预览。
            captureBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                    CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
            setAutoFlash(captureBuilder);

            // 方向
            int rotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(rotation));

            CameraCaptureSession.CaptureCallback CaptureCallback
                    = new CameraCaptureSession.CaptureCallback() {

                @Override
                public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                               @NonNull CaptureRequest request,
                                               @NonNull TotalCaptureResult result) {
                    showToast("图片地址: " + mFile);
                    Log.d(TAG, mFile.toString());
                    unlockFocus();
                }
            };
            //停止连续取景
            mCaptureSession.stopRepeating();
            //捕获图片
            mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void showToast(final String text) {
        mActivity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(mActivity, text, Toast.LENGTH_SHORT).show();
            }
        });
    }

    private int getOrientation(int rotation) {

        return (ORIENTATIONS.get(rotation) + mSensorOrientation + 270) % 360;
    }

    private void setAutoFlash(CaptureRequest.Builder requestBuilder) {
        if (mFlashSupported) {
            requestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
                    CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
        }
    }
    /**
     * 解锁焦点
     */
    private void unlockFocus() {
        try {
            // 重置自动对焦
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
            setAutoFlash(mPreviewRequestBuilder);
            mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                    mBackgroundHandler);
            // 将相机恢复正常的预览状态。
            mState = STATE_PREVIEW;
            // 打开连续取景模式
            mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback,
                    mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    /**
     * 运行捕获静止图像的预捕获序列。 当我们从{@link #（）}的{@link #mCaptureCallback}中得到响应时，应该调用此方法。
     */
    private void runPrecaptureSequence() {
        try {
            // 这是如何告诉相机触发的。
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
                    CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START);
            // 告诉 mCaptureCallback 等待preapture序列被设置.
            mState = STATE_WAITING_PRECAPTURE;
            mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                    mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private ImageReader.OnImageAvailableListener mOnImageAvailableListener
            = new ImageReader.OnImageAvailableListener() {
        @Override
        public void onImageAvailable(ImageReader reader) {
            //等图片可以得到的时候获取图片并保存
            mBackgroundHandler.post(new ImageSaver(reader.acquireNextImage(), mFile));
        }
    };

    /**
     * 设置与相机相关的成员变量。
     *
     * @param width  相机预览的可用尺寸宽度
     * @param height 相机预览的可用尺寸的高度
     */
    private void setUpCameraOutputs(int width, int height) {

        CameraManager manager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
        //获取摄像头列表
        try {
            for (String cameraId : manager.getCameraIdList()) {
                CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
                //不使用前置摄像
                Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
                if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) {
                    continue;//不结束循环,只跳出本次循环
                }
                StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
                if (map == null) {
                    continue;
                }
                //对于静态图像拍照, 使用最大的可用尺寸
                Size largest = Collections.max(
                        Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)),
                        new CompareSizesByArea()
                );
                mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(), ImageFormat.JPEG, 2);
                mImageReader.setOnImageAvailableListener(mOnImageAvailableListener, mBackgroundHandler);
                //获取手机旋转的角度以调整图片的方向

                int displayRotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
                mSensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
                boolean swappedDimensions = false;

                switch (displayRotation) {
                    case Surface.ROTATION_0:
                    case Surface.ROTATION_180:
                        //横屏
                        if (mSensorOrientation == 90 || mSensorOrientation == 270) {
                            swappedDimensions = true;
                        }
                        break;
                    case Surface.ROTATION_90:
                    case Surface.ROTATION_270:
                        //竖屏
                        if (mSensorOrientation == 0 || mSensorOrientation == 180) {
                            swappedDimensions = true;
                        }
                        break;
                    default:
                        Log.e(TAG, "Display rotation is invalid: " + displayRotation);
                }

                Point displaySize = new Point();
                mActivity.getWindowManager().getDefaultDisplay().getSize(displaySize);
                int rotatedPreviewWidth = width;
                int rotatedPreviewHeight = height;
                int maxPreviewWidth = displaySize.x;
                int maxPreviewHeight = displaySize.y;

                if (swappedDimensions) {
                    rotatedPreviewWidth = height;
                    rotatedPreviewHeight = width;
                    maxPreviewWidth = displaySize.y;
                    maxPreviewHeight = displaySize.x;
                }

                if (maxPreviewWidth > MAX_PREVIEW_WIDTH) {
                    maxPreviewWidth = MAX_PREVIEW_WIDTH;
                }

                if (maxPreviewHeight > MAX_PREVIEW_HEIGHT) {
                    maxPreviewHeight = MAX_PREVIEW_HEIGHT;
                }

                DisplayMetrics displayMetrics = new DisplayMetrics();
                mActivity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
                int widthPixels = displayMetrics.widthPixels;
                int heightPixels = displayMetrics.heightPixels;
                Log.d(TAG, "widthPixels: " + widthPixels + "____heightPixels:" + heightPixels);

                //尝试使用太大的预览大小可能会超出摄像头的带宽限制
                mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
                        rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
                        maxPreviewHeight, largest);

                //我们将TextureView的宽高比与我们选择的预览大小相匹配。这样设置不会拉伸,但是不能全屏展示
                int orientation = mActivity.getResources().getConfiguration().orientation;
                if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
                    //横屏
                    mTextureView.setAspectRatio(
                            mPreviewSize.getWidth(),mPreviewSize.getHeight());
                    Log.d(TAG, "横屏: "+"width:"+mPreviewSize.getWidth()+"____height:"+mPreviewSize.getHeight());

            } else {
                // 竖屏
                mTextureView.setAspectRatio(
                        widthPixels, heightPixels);

                Log.d(TAG, "竖屏: "+"____height:"+mPreviewSize.getHeight()+"width:"+mPreviewSize.getWidth());
            }

                mMediaRecorder = new MediaRecorder();

                mCameraId = cameraId;
                return;
            }
        } catch (CameraAccessException e) {


        }

    }

    /**
     * 根据他们的区域比较两个Size
     */
    static class CompareSizesByArea implements Comparator {

        @Override
        public int compare(Size lhs, Size rhs) {
            // 我们在这里投放，以确保乘法不会溢出
            return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
                    (long) rhs.getWidth() * rhs.getHeight());
        }

    }
    private static Size chooseOptimalSize(Size[] choices, int textureViewWidth,
                                          int textureViewHeight, int maxWidth, int maxHeight, Size aspectRatio) {

        // 收集支持的分辨率，这些分辨率至少与预览图面一样大
        List bigEnough = new ArrayList<>();
        // 收集小于预览表面的支持分辨率
        List notBigEnough = new ArrayList<>();
        int w = aspectRatio.getWidth();
        int h = aspectRatio.getHeight();
        for (Size option : choices) {
            if (option.getWidth() <= maxWidth && option.getHeight() <= maxHeight &&
                    option.getHeight() == option.getWidth() * h / w) {
                if (option.getWidth() >= textureViewWidth &&
                        option.getHeight() >= textureViewHeight) {
                    bigEnough.add(option);
                } else {
                    notBigEnough.add(option);
                }
            }
        }

        //挑一个足够大的最小的。如果没有一个足够大的，就挑一个不够大的。
        if (bigEnough.size() > 0) {
            return Collections.min(bigEnough, new CompareSizesByArea());
        } else if (notBigEnough.size() > 0) {
            return Collections.max(notBigEnough, new CompareSizesByArea());
        } else {
            Log.d(TAG, "Couldn't find any suitable preview size");
            return choices[0];
        }
    }
    private void configureTransform(int viewWidth, int viewHeight) {
        if (null == mTextureView || null == mPreviewSize) {
            return;
        }
        int rotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
        Matrix matrix = new Matrix();
        RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
        RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
        float centerX = viewRect.centerX();
        float centerY = viewRect.centerY();
        if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
            bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
            matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
            float scale = Math.max(
                    (float) viewHeight / mPreviewSize.getHeight(),
                    (float) viewWidth / mPreviewSize.getWidth());
            matrix.postScale(scale, scale, centerX, centerY);
            matrix.postRotate(90 * (rotation - 2), centerX, centerY);
        } else if (Surface.ROTATION_180 == rotation) {
            matrix.postRotate(180, centerX, centerY);
        }
        mTextureView.setTransform(matrix);
    }

    /**
     * 将JPG保存到指定的文件中。
     */
    private static class ImageSaver implements Runnable {

        /**
         * JPEG图像
         */
        private final Image mImage;
        /**
         * 保存图像的文件
         */
        private final File mFile;

        public ImageSaver(Image image, File file) {
            mImage = image;
            mFile = file;
        }

        @Override
        public void run() {
            ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();
            byte[] bytes = new byte[buffer.remaining()];
            buffer.get(bytes);
            FileOutputStream output = null;
            try {
                output = new FileOutputStream(mFile);
                output.write(bytes);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                mImage.close();
                if (null != output) {
                    try {
                        output.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    }
}