1.首先android6.0以上版本要动态申请相机和文件读写权限
2.废话不啰嗦，上代码：
/*** 摄像头画面采集界面*/public class DistinguishActivity extends BaseActivity implements SurfaceHolder.Callback, Camera.PictureCallback {private ImageView iv_ivPhoto;private SurfaceView surfaceView;private SurfaceHolder surfaceHolder;private Camera camera;List<String> unGrantedPermissions;private static final String[] MANDATORY_PERMISSIONS = {"android.permission.CAMERA",Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE};private String localImgPath;private LinearLayout guide_layout;private TextView btn_preview;private IPointToReadClient client;private boolean isAuthorizatoned = false;private final int TAKE_PICTURE = 0xa1;private boolean camaraPouse = false;private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case TAKE_PICTURE:takePicture();break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_distinguish);initViews();checkPermissions();}@Overrideprotected void onResume() {super.onResume();if (camaraPouse) {initCamera();}}private void checkPermissions() {unGrantedPermissions = new ArrayList();for (String permission : MANDATORY_PERMISSIONS) {if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {unGrantedPermissions.add(permission);}}if (unGrantedPermissions.size() == 0) {//已经获得了所有权限initCamera();} else {//部分权限未获得，重新请求获取权限String[] array = new String[unGrantedPermissions.size()];ActivityCompat.requestPermissions(this, unGrantedPermissions.toArray(array), 0);}}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {unGrantedPermissions.clear();for (int i = 0; i < permissions.length; i++) {if (grantResults[i] == PackageManager.PERMISSION_DENIED)unGrantedPermissions.add(permissions[i]);}if (unGrantedPermissions.size() > 0) {for (String permission : unGrantedPermissions) {if (!ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {Toast.makeText(this, "权限" + permission + "被拒绝", Toast.LENGTH_SHORT).show();finish();} else ActivityCompat.requestPermissions(this, new String[]{permission}, 0);}} else {initCamera();}}@Overrideprotected void onDestroy() {super.onDestroy();camera.release();camera = null;handler.removeMessages(TAKE_PICTURE);}private void initViews() {surfaceView = (SurfaceView) findViewById(R.id.iv_surfaceview);iv_ivPhoto = (ImageView) findViewById(R.id.iv_Photo);btn_close = (ImageView) findViewById(R.id.btn_close);btn_preview = (TextView) findViewById(R.id.btn_preview);guide_layout = (LinearLayout) findViewById(R.id.guide_layout);btn_preview.setOnClickListener(this);showCamera();}private void initCamera() {surfaceHolder = surfaceView.getHolder();surfaceHolder.setFormat(PixelFormat.TRANSPARENT);surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);surfaceHolder.setKeepScreenOn(true);//屏幕常亮surfaceHolder.addCallback(this);handler.sendEmptyMessageDelayed(TAKE_PICTURE, 1000);//2秒后自动拍照}private void takePicture() {if (null != camera && null != client) {camera.takePicture(null, null, null, DistinguishActivity.this);Toast.makeText(DistinguishActivity.this,"=========拍照========",Toast.LENGTH_SHORT).show();LogUtils.debugInfo("takePicture------------执行了拍照------------");}}@Overridepublic void surfaceCreated(SurfaceHolder surfaceHolder) {int cameraNums = Camera.getNumberOfCameras();LogUtils.debugInfo("surfaceCreated------------" + cameraNums + "---------------");try {camera = Camera.open(cameraNums - 1);camera.setPreviewDisplay(surfaceHolder);Camera.Parameters parameters = camera.getParameters();List<Camera.Size> sizeList = parameters.getSupportedPictureSizes();int bestSize = 0;for (Camera.Size size : sizeList) {if (size.width == size.height) {bestSize = size.width;}LogUtils.debugInfo("系统支持的尺寸-----------------------size.width=" + size.width + ";size.height=" + size.height);}parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);//1连续对焦if (bestSize == 0) {parameters.setPictureSize(2976, 2976);//这个尺寸最接近1440*1440} else {parameters.setPictureSize(bestSize, bestSize);}if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {parameters.set("orientation", "portrait");camera.setDisplayOrientation(90);parameters.setRotation(90);}List<String> colorEffects = parameters.getSupportedColorEffects();Iterator<String> cei = colorEffects.iterator();while (cei.hasNext()) {String currentEffect = cei.next();if (currentEffect.equals(Camera.Parameters.EFFECT_SOLARIZE)) {parameters.setColorEffect(Camera.Parameters.EFFECT_SOLARIZE);break;}}camera.setParameters(parameters);camera.startPreview();camera.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上} catch (Exception e) {// TODO Auto-generated catch blockLogUtils.debugInfo("Camera.open------------Exception------------" + e.getMessage());Toast.makeText(DistinguishActivity.this, "相机打开失败", Toast.LENGTH_SHORT).show();camera.release();finish();}}@Overridepublic void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {// //实现自动对焦camera.autoFocus(new Camera.AutoFocusCallback() {@Overridepublic void onAutoFocus(boolean success, Camera camera) {if (success) {camera.startPreview();camera.cancelAutoFocus();//只有加上了这一句，才会自动对焦。}}});}@Overridepublic void surfaceDestroyed(SurfaceHolder surfaceHolder) {try {camera.stopPreview();camera.release();}catch (RuntimeException e){LogUtils.debugInfo("surfaceDestroyed------------------------RuntimeException="+e.getMessage());}}@Overridepublic void onPictureTaken(byte[] bytes, Camera mcamera) {LogUtils.debugInfo("onPictureTaken------------------------");mcamera.startPreview();BitmapFactory.Options options = new BitmapFactory.Options();final Bitmap bitmap = getPicFromBytes(bytes, options);//byte转为bitmap原图final Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, 1440, 1440, true);//原图压缩为指定尺寸final Bitmap result = setMatrix(scaledBitmap);//改变镜像new Thread(new Runnable() {@Overridepublic void run() {//保存到本地saveImageToGallery(result);// 发起网络请求，上传图片到服务器handler.sendEmptyMessageDelayed(TAKE_PICTURE, 50);//1秒后自动拍照}}).start();}/*** @param 将字节数组转换为ImageView可调用的Bitmap对象* @param bytes* @param opts* @return Bitmap*/private Bitmap getPicFromBytes(byte[] bytes,BitmapFactory.Options opts) {if (bytes != null)if (opts != null)return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,opts);elsereturn BitmapFactory.decodeByteArray(bytes, 0, bytes.length);return null;}/*** 设置镜像左右反一下** @param bmpPreview* @return*/private Bitmap setMatrix(Bitmap bmpPreview) {Bitmap bitmap = null;Matrix m = new Matrix();m.postScale(-1, 1); // 镜像水平翻转bitmap = Bitmap.createBitmap(bmpPreview, 0, 0, bmpPreview.getWidth(), bmpPreview.getHeight(), m, true);return bitmap;}public int saveImageToGallery(Bitmap bmp) {//生成路径String root = Environment.getExternalStorageDirectory().getAbsolutePath();String dirName = "FingerReadingPhoto";File appDir = new File(root, dirName);if (!appDir.exists()) {appDir.mkdirs();}String fileName = "TestPhoto.png";localImgPath = appDir + "/" + fileName;//获取文件File file = new File(appDir, fileName);if (file.exists()) {file.delete();}FileOutputStream fos = null;try {fos = new FileOutputStream(file);press(pressFormat.JPEG, 100, fos);fos.flush();//通知系统相册刷新sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,Uri.fromFile(new File(file.getPath()))));return 2;} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {if (fos != null) {fos.close();}} catch (IOException e) {e.printStackTrace();}}return -1;}private void hideCamera() {RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) surfaceView.getLayoutParams();params.width = 1;params.height = 1;surfaceView.setLayoutParams(params);}private void showCamera() {DisplayMetrics outMetrics = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(outMetrics);int widthPixels = outMetrics.widthPixels;int heightPixels = outMetrics.heightPixels;RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) surfaceView.getLayoutParams();params.width = widthPixels;params.height = heightPixels;surfaceView.setLayoutParams(params);}public void close(View view) {if (action == 0) {guide_layout.setVisibility(View.VISIBLE);hideCamera();} else {finish();}}}
