实现功能：

通过安卓自带的SensorManager(传感器)来判断，当用户横向拍照时照片出来是竖向显示的

实现代码：

final Intent intent = new Intent(TakePic_Activity.this, PhotoActivity.class);
String url=Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator+ "PICvkl" + File.separator + szCarNum + szCarNumType + StrCode + ".jpg";
intent.putExtra("uri", url);
startActivityForResult(intent,55);

PhotoActivity

public class PhotoActivity extends Activity {private SurfaceView surfaceView;        //照片显示surfaceviewprivate Button takephotoBtn;            //拍照按钮private TextView nameTv;                //项目名private SurfaceHolder surfaceHolder;    //surfaceview控制器private Camera camera;private ImageView lightImg;             //闪光灯private boolean isLightOpen = false;      //闪光灯是否开启ProgressDialog dialog;private String uri = "";/*** 新加缩放控件*/private SeekBar mZoomSeekBar;private ScreenSwitchUtils instance;//传感器工具类对象@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_photo);instance = ScreenSwitchUtils.init(getApplicationContext());initView();initListener();}@Overrideprotected void onStart() {super.onStart();instance.start(this);}@Overrideprotected void onStop() {super.onStop();instance.stop();}private void initView() {if (getIntent() != null) {uri = getIntent().getStringExtra("uri");Log.e("lcb", "照片的保留地方:" + uri);}nameTv = (TextView) findViewById(R.id.name_tv);surfaceView = (SurfaceView) findViewById(R.id.surface_view);takephotoBtn = (Button) findViewById(R.id.takephoto_btn);lightImg = (ImageView) findViewById(R.id.light_img);mZoomSeekBar = (SeekBar) findViewById(R.id.zoomSeekBar);//设置标题文字   (请横拍)项目名：nameTv.setText("支持横竖拍，竖拍左右倾斜不要超过45度\n横拍请向左，保证\"拍照\"按钮在右边");}private void initListener() {surfaceHolder = surfaceView.getHolder();                        //设置HoldersurfaceHolder.addCallback(surfaceCallback);                     //加入回调surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //设置缓冲类型//  图片大小在200K-600K之间 （检测线的规格是2080X1560）surfaceHolder.setFixedSize(3264, 2448);//闪光灯开关控制器lightImg.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (!isLightOpen) {if (camera != null) {Camera.Parameters parameters = camera.getParameters();parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);camera.setParameters(parameters);camera.startPreview();}isLightOpen = true;lightImg.setImageResource(R.drawable.light_down);} else {if (camera != null) {Camera.Parameters parameters = camera.getParameters();parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);camera.setParameters(parameters);camera.startPreview();}isLightOpen = false;lightImg.setImageResource(R.drawable.light_up);}}});//点击拍照按钮进行拍照。takephotoBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {/** shutter:快门被按下* raw:相机所捕获的原始数据* jpeg:相机处理的数据*/takePhoto();}});}Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {//保存图片new SavePictureTask().execute(data, null, null);//开始预览camera.startPreview();}};/*** 3、异步保存图片。*/class SavePictureTask extends AsyncTask<byte[], String, String> {@Overrideprotected String doInBackground(byte[]... params) {File file = new File(uri);try {
//                BitmapFactory.Options options=new BitmapFactory.Options();
//                options.inSampleSize=8;Bitmap bitmap = BitmapFactory.decodeByteArray(params[0], 0, params[0].length);//水印格式：流水号：XXX  车辆识别代号：XXX 时间：XXX  （如果有车牌号的，则把车牌号也输入上去）查验员代号：XXX  红色 左上方Log.v("lcb","当前角度:"+instance.getOrientation()+" 是否竖屏："+instance.isPortrait());if (instance.isPortrait()) {/*如果是竖屏压缩bitmap时候设置方向*/Matrix matrix = new Matrix();matrix.reset();matrix.postRotate(90);bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);}FileOutputStream fos = new FileOutputStream(file.getPath());//图片压缩到70%//如果第一张，清楚bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);fos.flush();fos.close();                    //关流bitmap.recycle();               //回收bitmap资源dialog.dismiss();setResult(Activity.RESULT_OK, null);finish();} catch (Exception e) {Log.e("lcb", "photo156:" + e.toString());}return null;}}/*** SurfaceHolder回调函数。重写SurfaceHolder.Callback接口的surfaceCreated、surfaceChanged、surfaceDestroyed方法。*/SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {private static final String TAG = "CameraPreview";public void surfaceCreated(SurfaceHolder holder) {camera = Camera.open();                 //打开摄像头try {camera.setDisplayOrientation(90);   //设置camera预览的角度，因为默认图片是倾斜90度的camera.setPreviewDisplay(holder);   //设置holder主要是用于surfaceView的图片的实时预览，以及获取图片等功能} catch (IOException e) {camera.release();                   //释放camera = null;}}public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
//            Camera.Parameters parameters = camera.getParameters();
//            parameters.setPictureSize(3264, 2448);
//            camera.setParameters(parameters);
//            camera.startPreview();                  //开始预览
//            camera.autoFocus(autoFocusCallback);//当SurfaceView尺寸变化时（包括设备横屏竖屏改变时时），需要重新设定相关参数if (holder.getSurface() == null) {//检查SurfaceView是否存在return;}//改变设置前先关闭相机try {camera.stopPreview();} catch (Exception e) {e.printStackTrace();}//使用最佳比例配置重启相机try {camera.setPreviewDisplay(holder);Camera.Parameters parameters = camera.getParameters();Camera.Size size = getBestPreviewSize(width, height);parameters.setPreviewSize(size.width, size.height);parameters.setPictureSize(3264, 2448);camera.setParameters(parameters);camera.startPreview();} catch (Exception e) {Log.d(TAG, "Error starting camera preview: " + e.getMessage());}}public void surfaceDestroyed(SurfaceHolder holder) {camera.stopPreview();   // stop previewcamera.release();       // Release camera resourcescamera = null;}};/*** 拍照操作*/private void takePhoto() {try {camera.takePicture(null, null, pictureCallback);} catch (Exception e) {e.printStackTrace();Log.e("lcb", "拍照操作报错:" + e.toString());}if (dialog == null) {dialog = new ProgressDialog(PhotoActivity.this);dialog.setMessage("图片处理中……");}dialog.show();// 2017/4/26   dialog十秒没关，自动关掉dialognew Thread() {@Overridepublic void run() {super.run();try {sleep(10000);if (!PhotoActivity.this.isFinishing()) {dialog.dismiss();}} catch (InterruptedException e) {e.printStackTrace();}}}.start();}private Camera.Size getBestPreviewSize(int width, int height) {Camera.Size result = null;final Camera.Parameters p = camera.getParameters();//特别注意此处需要规定rate的比是大的比小的，不然有可能出现rate = height/width，但是后面遍历的时候，current_rate = width/height,所以我们限定都为大的比小的。float rate = (float) Math.max(width, height) / (float) Math.min(width, height);float tmp_diff;float min_diff = -1f;for (Camera.Size size : p.getSupportedPreviewSizes()) {float current_rate = (float) Math.max(size.width, size.height) / (float) Math.min(size.width, size.height);tmp_diff = Math.abs(current_rate - rate);if (min_diff < 0) {min_diff = tmp_diff;result = size;}if (tmp_diff < min_diff) {min_diff = tmp_diff;result = size;}}return result;}/*** 记录是拖拉照片模式还是放大缩小照片模式*/private static final int MODE_INIT = 0;/*** 放大缩小照片模式*/private static final int MODE_ZOOM = 1;private int mode = MODE_INIT;// 初始状态private float startDis;@SuppressLint("HandlerLeak")private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);}};@Overridepublic boolean onTouchEvent(MotionEvent event) {/** 通过与运算保留最后八位 MotionEvent.ACTION_MASK = 255 */switch (event.getAction() & MotionEvent.ACTION_MASK) {// 手指压下屏幕case MotionEvent.ACTION_DOWN:mode = MODE_INIT;break;case MotionEvent.ACTION_POINTER_DOWN://如果mZoomSeekBar为null 表示该设备不支持缩放 直接跳过设置mode Move指令也无法执行if (mZoomSeekBar == null) return true;//移除token对象为mZoomSeekBar的延时任务mHandler.removeCallbacksAndMessages(mZoomSeekBar);
//                mZoomSeekBar.setVisibility(View.VISIBLE);mZoomSeekBar.setVisibility(View.GONE);mode = MODE_ZOOM;/** 计算两个手指间的距离 */startDis = spacing(event);break;case MotionEvent.ACTION_MOVE:if (mode == MODE_ZOOM) {//只有同时触屏两个点的时候才执行if (event.getPointerCount() < 2) return true;float endDis = spacing(event);// 结束距离//每变化10f zoom变1int scale = (int) ((endDis - startDis) / 10f);if (scale != 0) {int zoom = getZoom() + scale;//zoom不能超出范围if (zoom > getMaxZoom()) zoom = getMaxZoom();if (zoom < 0) zoom = 0;setZoom(zoom);mZoomSeekBar.setProgress(zoom);//将最后一次的距离设为当前距离startDis = endDis;}}break;// 手指离开屏幕case MotionEvent.ACTION_UP:if (mode != MODE_ZOOM) {//设置聚焦Point point = new Point((int) event.getX(), (int) event.getY());onCameraFocus(point);} else {//ZOOM模式下 在结束两秒后隐藏seekbar 设置token为mZoomSeekBar用以在连续点击时移除前一个定时任务mHandler.postAtTime(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubmZoomSeekBar.setVisibility(View.GONE);}}, mZoomSeekBar, SystemClock.uptimeMillis() + 2000);}break;}return true;}/*** 两点的距离*/private float spacing(MotionEvent event) {if (event == null) {return 0;}float x = event.getX(0) - event.getX(1);float y = event.getY(0) - event.getY(1);return (float) Math.sqrt(x * x + y * y);}/*** 相机对焦  默认不需要延时*/private void onCameraFocus(final Point point) {onCameraFocus(point, false);}/*** @param needDelay 是否需要延时* @author Longchengbin* @description 相机对焦* @since 2020-11-2 10:02**/public void onCameraFocus(final Point point, boolean needDelay) {if (camera == null) {return;}
//        getMaxNumFocusAreas：获取支持的对焦区域的个数
//        setFocusAreas：设置对焦区域列表
//        getFocusAreas：获取对焦区域列表
//        getMaxNumMeteringAreas: 获取支持的测光区域的个数
//        setMeteringAreas：设置测光区域列表
//        getMeteringAreas：获取测光区域列表Camera.Parameters parameters = camera.getParameters();//不支持设置自定义聚焦，则使用自动聚焦，返回if (parameters.getMaxNumFocusAreas() <= 0) {camera.autoFocus(autoFocusCallback);return;}List<Camera.Area> areas = new ArrayList<Camera.Area>();int left = point.x - 30;int top = point.y - 30;int right = point.x + 30;int bottom = point.y + 30;left = left < -1000 ? -1000 : left;top = top < -1000 ? -1000 : top;right = right > 1000 ? 1000 : right;bottom = bottom > 1000 ? 1000 : bottom;areas.add(new Camera.Area(new Rect(left, top, right, bottom), 100));parameters.setFocusAreas(areas);camera.cancelAutoFocus();//结束上一次的对焦操作，不管是有没有完成对焦try {camera.setParameters(parameters);} catch (Exception e) {Log.e("lcb", "相机对焦报错:" + e.toString());}camera.autoFocus(autoFocusCallback);//执行一次对焦操作，通过Camera.AutoFocusCallback返回对焦结果}/*** 当前缩放*/private int mZoom;public int getMaxZoom() {if (surfaceView == null) return -1;Camera.Parameters parameters = camera.getParameters();if (!parameters.isZoomSupported()) return -1;return parameters.getMaxZoom() > 40 ? 40 : parameters.getMaxZoom();}public void setZoom(int zoom) {if (camera == null) return;Camera.Parameters parameters;//注意此处为录像模式下的setZoom方式。在Camera.unlock之后，调用getParameters方法会引起android框架底层的异常//stackoverflow上看到的解释是由于多线程同时访问Camera导致的冲突，所以在此使用录像前保存的mParameters。parameters = camera.getParameters();if (!parameters.isZoomSupported()) return;parameters.setZoom(zoom);camera.setParameters(parameters);mZoom = zoom;}public int getZoom() {return mZoom;}/*** @author Longchengbin* @description 自动对焦回调* @since 2020-11-2 10:06**/Camera.AutoFocusCallback autoFocusCallback = new Camera.AutoFocusCallback() {@Overridepublic void onAutoFocus(boolean b, final Camera camera) {if (b) {camera.cancelAutoFocus();new Thread() {@Overridepublic void run() {super.run();try {sleep(1000);} catch (Exception e) {e.printStackTrace();}try {if (!PhotoActivity.this.isFinishing()) {// TODO: 2017/7/18 三星手机长时间自动对焦失败，取消自动对焦camera.autoFocus(autoFocusCallback);}} catch (Exception e) {e.printStackTrace();Log.e("lcb", "自动对焦回调报错:" + e.toString());}}}.start();}}};}

R.layout.activity_photo

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/activity_photo"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><TextViewandroid:id="@+id/name_tv"android:layout_width="match_parent"android:layout_height="40dp"android:background="@color/colorBlackDark"android:gravity="center"android:text="请横向拍照"android:textColor="@color/colorWhite" /><FrameLayoutandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"><SurfaceViewandroid:id="@+id/surface_view"android:layout_width="match_parent"android:layout_height="match_parent" /></FrameLayout><SeekBarandroid:visibility="gone"android:id="@+id/zoomSeekBar"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginLeft="50dip"android:layout_marginRight="50dip" /><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="60dp"android:background="@color/colorBlackDark"><Buttonandroid:id="@+id/takephoto_btn"android:layout_width="60dp"android:layout_height="40dp"android:layout_centerInParent="true"android:background="@drawable/selector_paizhao" /><ImageViewandroid:id="@+id/light_img"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_marginLeft="10dp"android:padding="10dp"android:src="@drawable/light_down" /></RelativeLayout></LinearLayout>

ScreenSwitchUtils

public class ScreenSwitchUtils {private int mOrientation;private static final String TAG = "test";private volatile static ScreenSwitchUtils mInstance;private Activity mActivity;// 是否是竖屏private boolean isPortrait = true;private SensorManager sm;private OrientationSensorListener listener;private Sensor sensor;private SensorManager sm1;private Sensor sensor1;private OrientationSensorListener1 listener1;/*** 返回ScreenSwitchUtils单例**/public static ScreenSwitchUtils init(Context context) {if (mInstance == null) {synchronized (ScreenSwitchUtils.class) {if (mInstance == null) {mInstance = new ScreenSwitchUtils(context);}}}return mInstance;}private ScreenSwitchUtils(Context context) {Log.d(TAG, "初始化监听");// 注册重力感应器,监听屏幕旋转sm = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);if (sm != null) {sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);}//当前倾斜角度赋值@SuppressLint("HandlerLeak")Handler mHandler = new Handler() {public void handleMessage(Message msg) {switch (msg.what) {case 888:int orientation = msg.arg1;mOrientation = orientation;//当前倾斜角度赋值if (orientation > 45 && orientation < 135) {if (isPortrait) {isPortrait = false;Log.w("test", "切换成横屏 当前角度：" + getOrientation() + " 是否竖屏:" + isPortrait());}} else if (orientation > 135 && orientation < 225) {if (!isPortrait) {isPortrait = true;Log.e("test", "切换成竖屏 当前角度：" + getOrientation() + " 是否竖屏:" + isPortrait());}} else if (orientation > 225 && orientation < 315) {if (isPortrait) {isPortrait = false;Log.w("test", "切换成横屏 当前角度：" + getOrientation() + " 是否竖屏:" + isPortrait());}} else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {if (!isPortrait) {isPortrait = true;Log.e("test", "切换成竖屏 当前角度：" + getOrientation() + " 是否竖屏:" + isPortrait());}}break;default:break;}}};listener = new OrientationSensorListener(mHandler);// 根据 旋转之后/点击全屏之后 两者方向一致,激活sm.sm1 = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);if (sm1 != null) {sensor1 = sm1.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);}listener1 = new OrientationSensorListener1();}public void start(Activity activity) {Log.d(TAG, "开始监听");mActivity = activity;sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);}public void stop() {Log.d(TAG, "停止监听");sm.unregisterListener(listener);sm1.unregisterListener(listener1);}/*** 手动横竖屏切换方向*/public void toggleScreen() {sm.unregisterListener(listener);sm1.registerListener(listener1, sensor1, SensorManager.SENSOR_DELAY_UI);if (isPortrait) {isPortrait = false;// 切换成横屏mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);} else {isPortrait = true;// 切换成竖屏mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}}/*当前是否竖屏*/public boolean isPortrait() {return this.isPortrait;}/*** 重力感应监听者*/public class OrientationSensorListener implements SensorEventListener {private static final int _DATA_X = 0;private static final int _DATA_Y = 1;private static final int _DATA_Z = 2;public static final int ORIENTATION_UNKNOWN = -1;private Handler rotateHandler;public OrientationSensorListener(Handler handler) {rotateHandler = handler;}public void onAccuracyChanged(Sensor arg0, int arg1) {}public void onSensorChanged(SensorEvent event) {float[] values = event.values;int orientation = ORIENTATION_UNKNOWN;float X = -values[_DATA_X];float Y = -values[_DATA_Y];float Z = -values[_DATA_Z];float magnitude = X * X + Y * Y;// Don't trust the angle if the magnitude is small compared to the y// valueif (magnitude * 4 >= Z * Z) {// 屏幕旋转时float OneEightyOverPi = 57.29577957855f;float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;orientation = 90 - Math.round(angle);// normalize to 0 - 359 rangewhile (orientation >= 360) {orientation -= 360;}while (orientation < 0) {orientation += 360;}}if (rotateHandler != null) {rotateHandler.obtainMessage(888, orientation, 0).sendToTarget();}}}public class OrientationSensorListener1 implements SensorEventListener {private static final int _DATA_X = 0;private static final int _DATA_Y = 1;private static final int _DATA_Z = 2;public static final int ORIENTATION_UNKNOWN = -1;public OrientationSensorListener1() {}public void onAccuracyChanged(Sensor arg0, int arg1) {}public void onSensorChanged(SensorEvent event) {float[] values = event.values;int orientation = ORIENTATION_UNKNOWN;float X = -values[_DATA_X];float Y = -values[_DATA_Y];float Z = -values[_DATA_Z];float magnitude = X * X + Y * Y;//如果幅度比y值小，则不要相信角度if (magnitude * 4 >= Z * Z) {// 屏幕旋转时float OneEightyOverPi = 57.29577957855f;float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;orientation = 90 - Math.round(angle);// normalize to 0 - 359 rangewhile (orientation >= 360) {orientation -= 360;}while (orientation < 0) {orientation += 360;}}if (orientation > 225 && orientation < 315) {// 检测到当前实际是横屏if (!isPortrait) {sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);sm1.unregisterListener(listener1);}} else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {// 检测到当前实际是竖屏if (isPortrait) {sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);sm1.unregisterListener(listener1);}}}}/*返回当前角度*/public int getOrientation() {return mOrientation;}
}

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安卓自定义照相机（横竖屏感应）

实现功能：

实现代码：

PhotoActivity

R.layout.activity_photo

ScreenSwitchUtils

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