Android blic void onPictureTaken（字节[]数据，摄像头）{ 试一试{ mFileTemp=new SaveImageTask（）.execute（data.get（）； }捕捉（中断异常e）{ e、 printStackTrace（）； }捕获（执行例外）{ e、 printStackTrace（）； } 复位凸轮（）； Log.d（标签“onPictureTaken-jpeg”）； } }; 私有类SaveImageTask扩展了AsyncTask{ @凌驾 受保护文件doInBackground（字节[]…数据）{ FileOutputStream扩展流=null； 文件outFile=null； //写入SD卡 试一试{ 文件sdCard=Environment.getExternalStorageDirectory（）； File dir=新文件（sdCard.getAbsolutePath（）+“/camtest”）； dir.mkdirs（）； 字符串文件名=String.format（“%d.jpg”，System.currentTimeMillis（））； outFile=新文件（dir，fileName）； outStream=新文件OutputStream（输出文件）； 超流写入（数据[0]）； 冲水； exptream.close（）； Log.d（标记“onPictureTaken-写入字节：“+data.length+”到“+outFile.getAbsolutePath（）”）； 刷新画廊（outFile）； }catch（filenotfounde异常）{ e、 printStackTrace（）； }捕获（IOE异常）{ e、 printStackTrace（）； }最后{ } 返回输出文件； } }

}

预习班

   class Preview extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "Preview";

    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
    Size mPreviewSize;
    List<Size> mSupportedPreviewSizes;
    Camera mCamera;
    Context mContext;

    Preview(Context context, SurfaceView sv) {
        super(context);
        mContext = context;
        mSurfaceView = sv;
//        addView(mSurfaceView);

        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void setCamera(Camera camera) {
        mCamera = camera;
        if (mCamera != null) {
            mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
            requestLayout();

            // get Camera parameters
            Camera.Parameters params = mCamera.getParameters();

            List<String> focusModes = params.getSupportedFocusModes();
            if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
                // set the focus mode
                params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
                // set Camera parameters
                mCamera.setParameters(params);
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // We purposely disregard child measurements because act as a
        // wrapper to a SurfaceView that centers the camera preview instead
        // of stretching it.
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        setMeasuredDimension(width, height);

        if (mSupportedPreviewSizes != null) {
            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        if (changed && getChildCount() > 0) {
            final View child = getChildAt(0);

            final int width = r - l;
            final int height = b - t;

            int previewWidth = width;
            int previewHeight = height;
            if (mPreviewSize != null) {
                previewWidth = mPreviewSize.width;
                previewHeight = mPreviewSize.height;
            }

            // Center the child SurfaceView within the parent.
            if (width * previewHeight > height * previewWidth) {
                final int scaledChildWidth = previewWidth * height / previewHeight;
                child.layout((width - scaledChildWidth) / 2, 0,
                        (width + scaledChildWidth) / 2, height);
            } else {
                final int scaledChildHeight = previewHeight * width / previewWidth;
                child.layout(0, (height - scaledChildHeight) / 2,
                        width, (height + scaledChildHeight) / 2);
            }
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
        try {
            if (mCamera != null) {
                mCamera.setPreviewDisplay(holder);
                mCamera.startPreview();
            }
        } catch (IOException exception) {
            Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        if (mCamera != null) {
            mCamera.stopPreview();
        }
    }


    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;
        if (sizes == null) return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        if(mCamera != null) {
            Camera.Parameters parameters = mCamera.getParameters(); 
//          parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
            Display display = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

                if(display.getRotation() == Surface.ROTATION_0)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);                           
                    mCamera.setDisplayOrientation(90);
                }

                if(display.getRotation() == Surface.ROTATION_90)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);                           
                }

                if(display.getRotation() == Surface.ROTATION_180)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);               
                }

                if(display.getRotation() == Surface.ROTATION_270)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
                    mCamera.setDisplayOrientation(180);
                }

                requestLayout();


            mCamera.setParameters(parameters);
            mCamera.startPreview();
        }
    }

}

类预览扩展视图组实现SurfaceHolder.Callback{
私有最终字符串标记=“预览”；
SurfaceView mSurfaceView；
表面粗糙度；
大小mPreviewSize；
列出MSSupportedPreviewsizes；
麦克默拉照相机；
语境；
预览（上下文，SurfaceView sv）{
超级（上下文）；
mContext=上下文；
mSurfaceView=sv；
//addView（mSurfaceView）；
mHolder=mSurfaceView.getHolder（）；
mHolder.addCallback（this）；
mHolder.setType（SurfaceHolder.SURFACE\u TYPE\u PUSH\u缓冲区）；
}
公共摄像机（摄像机）{
mCamera=摄像机；
if（mCamera！=null）{
mSupportedPreviewSizes=mCamera.getParameters（）.getSupportedPreviewSizes（）；
requestLayout（）；
//获取相机参数
Camera.Parameters params=mCamera.getParameters（）；
List focusModes=params.getSupportedFocusModes（）；
if（focusModes.contains（Camera.Parameters.FOCUS\u MODE\u AUTO））{
//设置焦点模式
params.setFocusMode（摄像头.Parameters.FOCUS_MODE_AUTO）；
//设置相机参数
mCamera.setParameters（参数）；
}
}
}
@凌驾
测量时的保护空隙（内部宽度测量等级、内部高度测量等级）{
//我们故意忽略儿童的测量，因为这是一种
//包装到将摄影机预览居中的SurfaceView
//我想把它拉长。
最终整数宽度=resolveSize（getSuggestedMinimumWidth（），widthMeasureSpec）；
最终整数高度=resolveSize（getSuggestedMinimumHeight（），heightMeasureSpec）；
设置测量尺寸（宽度、高度）；
if（mSupportedPreviewSizes！=null）{
mPreviewSize=getOptimalPreviewSize（MSSupportedPreviewSize、宽度、高度）；
}
}
@凌驾
仅受保护的void布局（布尔值已更改、int l、int t、int r、int b）{
如果（已更改&&getChildCount（）>0）{
最终视图子对象=getChildAt（0）；
最终整数宽度=r-l；
最终内部高度=b-t；
int previewWidth=宽度；
亮度=高度；
if（mPreviewSize！=null）{
previewWidth=mPreviewSize.width；
PreviewView=mPreviewSize.height；
}
//将子曲面视图居中放置在父曲面视图中。
如果（宽度*预览宽度>高度*预览宽度）{
最终整数缩放儿童宽度=预览宽度*高度/预览宽度；
布局（（宽度-scaledChildWidth）/2,0，
（宽度+缩放儿童宽度）/2，高度）；
}否则{
最终int scaledChildHeight=预览视图*宽度/预览宽度；
布局（0，（高度-缩放儿童高度）/2，
宽度（高度+缩放儿童高度）/2）；
}
}
}
已创建的公共空白表面（表面持有人）{
//曲面已创建，获取摄影机并告知其位置
//画。
试一试{
if（mCamera！=null）{
mCamera.setPreviewDisplay（支架）；
mCamera.startPreview（）；
}
}捕获（IOException异常）{
Log.e（标记“setPreviewDisplay（）引起的IOException”，exception）；
}
}
公共空间表面覆盖（表面覆盖物持有人）{
//当我们返回时，曲面将被破坏，因此请停止预览。
if（mCamera！=null）{
mCamera.stopPreview（）；
}
}
私有大小GetOptimizePreviewSize（列表大小，整数w，整数h）{
最终双纵横比公差=0.1；
双目标率=（双）w/h；
如果（size==null）返回null；
Size=null；
double minDiff=double.MAX_值；
int targetHeight=h；
//尝试找到与纵横比和大小匹配的大小
用于（尺寸：尺寸）{
双倍比率=（双倍）size.width/size.height；
如果（数学abs（比率-目标比率）>纵横比公差）继续；
if（数学绝对值（尺寸高度-目标光）   class Preview extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "Preview";

    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
    Size mPreviewSize;
    List<Size> mSupportedPreviewSizes;
    Camera mCamera;
    Context mContext;

    Preview(Context context, SurfaceView sv) {
        super(context);
        mContext = context;
        mSurfaceView = sv;
//        addView(mSurfaceView);

        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void setCamera(Camera camera) {
        mCamera = camera;
        if (mCamera != null) {
            mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
            requestLayout();

            // get Camera parameters
            Camera.Parameters params = mCamera.getParameters();

            List<String> focusModes = params.getSupportedFocusModes();
            if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
                // set the focus mode
                params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
                // set Camera parameters
                mCamera.setParameters(params);
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // We purposely disregard child measurements because act as a
        // wrapper to a SurfaceView that centers the camera preview instead
        // of stretching it.
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        setMeasuredDimension(width, height);

        if (mSupportedPreviewSizes != null) {
            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        if (changed && getChildCount() > 0) {
            final View child = getChildAt(0);

            final int width = r - l;
            final int height = b - t;

            int previewWidth = width;
            int previewHeight = height;
            if (mPreviewSize != null) {
                previewWidth = mPreviewSize.width;
                previewHeight = mPreviewSize.height;
            }

            // Center the child SurfaceView within the parent.
            if (width * previewHeight > height * previewWidth) {
                final int scaledChildWidth = previewWidth * height / previewHeight;
                child.layout((width - scaledChildWidth) / 2, 0,
                        (width + scaledChildWidth) / 2, height);
            } else {
                final int scaledChildHeight = previewHeight * width / previewWidth;
                child.layout(0, (height - scaledChildHeight) / 2,
                        width, (height + scaledChildHeight) / 2);
            }
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
        try {
            if (mCamera != null) {
                mCamera.setPreviewDisplay(holder);
                mCamera.startPreview();
            }
        } catch (IOException exception) {
            Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        if (mCamera != null) {
            mCamera.stopPreview();
        }
    }


    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;
        if (sizes == null) return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        if(mCamera != null) {
            Camera.Parameters parameters = mCamera.getParameters(); 
//          parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
            Display display = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

                if(display.getRotation() == Surface.ROTATION_0)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);                           
                    mCamera.setDisplayOrientation(90);
                }

                if(display.getRotation() == Surface.ROTATION_90)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);                           
                }

                if(display.getRotation() == Surface.ROTATION_180)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);               
                }

                if(display.getRotation() == Surface.ROTATION_270)
                {
                    parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
                    mCamera.setDisplayOrientation(180);
                }

                requestLayout();


            mCamera.setParameters(parameters);
            mCamera.startPreview();
        }
    }

}

String path = *your_image_path*;
Bitmap scaledBitmap = null;
ExifInterface ei = new ExifInterface(path);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
    scaledBitmap = ScalingUtilities.createScaledBitmap(unscaledBitmap, unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),ScalingLogic.FIT, 90);
case ExifInterface.ORIENTATION_ROTATE_180:
    scaledBitmap = ScalingUtilities.createScaledBitmap(unscaledBitmap, unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),ScalingLogic.FIT, 180);

Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(Camera.CameraInfo.CAMERA_FACING_BACK, info);
int cameraRotation = info.orientation;