Android Camera Preview Stretched

Question

I ve been working on making my custom camera activity on Android  but when rotating the camera  the aspect ratio of the surface view gets messed up   In my oncreate for the activity  I set the framelayout which holds the surface view that displays the camera s parameters     FrameLayout that will hold the camera preview         FrameLayout previewHolder    FrameLayout  findViewById R id camerapreview              Setting camera s preview size to the best preview size         Size optimalSize   null          camera   getCameraInstance            double aspectRatio   0          if camera    null                 Setting the camera s aspect ratio             Camera Parameters parameters   camera getParameters                List lt Size gt  sizes   parameters getSupportedPreviewSizes                optimalSize   CameraPreview getOptimalPreviewSize sizes  getResources   getDisplayMetrics   widthPixels  getResources   getDisplayMetrics   heightPixels               aspectRatio    float optimalSize width optimalSize height                     if optimalSize   null               RelativeLayout LayoutParams params   new RelativeLayout LayoutParams LayoutParams MATCH PARENT   int  getResources   getDisplayMetrics   widthPixels aspectRatio                previewHolder setLayoutParams params               LayoutParams surfaceParams   new LayoutParams LayoutParams MATCH PARENT   int  getResources   getDisplayMetrics   widthPixels aspectRatio                cameraPreview setLayoutParams surfaceParams                       cameraPreview setCamera camera              Adding the preview to the holder         previewHolder addView cameraPreview     Then  in the Surface view I set the camera s parameters to be displayed  public void setCamera Camera camera            if  mCamera    camera    return             mCamera   camera           if  mCamera    null                requestLayout                 try                   mCamera setPreviewDisplay mHolder                 catch  IOException e                    e printStackTrace                                if mCamera    null                     Setting the camera s aspect ratio                 Camera Parameters parameters   mCamera getParameters                    List lt Size gt  sizes   parameters getSupportedPreviewSizes                    Size optimalSize   getOptimalPreviewSize sizes  getResources   getDisplayMetrics   widthPixels  getResources   getDisplayMetrics   heightPixels                    parameters setPreviewSize optimalSize width  optimalSize height                   mCamera setParameters parameters                                               Important  Call startPreview   to start updating the preview surface  Preview must                be started before you can take a picture                               mCamera startPreview                         You can see that the LEGO man grows taller and skinnier when the phone is rotated     How can I ensure that the aspect ratio for my camera view is correct

User · Answer

Very important point here to understand , the SurfaceView size must be the same as the camera parameters size , it means they have the same aspect ratio then the Stretch effect will go off .

You have to get the correct supported camera preview size using params.getSupportedPreviewSizes() choose one of them and then change your SurfaceView and its holders to this size.

User · Answer

Hesam  s answer is correct  CameraPreview will work in all portrait devices  but if the device is in landscape mode or in multi-window mode  this code is working perfect  just replace onMeasure    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec       int width   resolveSize getSuggestedMinimumWidth    widthMeasureSpec       int height   resolveSize getSuggestedMinimumHeight    heightMeasureSpec       setMeasuredDimension width  height        int rotation     Activity  mContext  getWindowManager   getDefaultDisplay   getRotation        if   Surface ROTATION 0    rotation    Surface ROTATION 180    rotation      portrait         mPreviewSize   getOptimalPreviewSize mSupportedPreviewSizes  height  width         else         mPreviewSize   getOptimalPreviewSize mSupportedPreviewSizes  width  height    landscape      if  mPreviewSize    null  return      float ratio      if  mPreviewSize height  gt   mPreviewSize width            ratio    float  mPreviewSize height    float  mPreviewSize width        else ratio    float  mPreviewSize width    float  mPreviewSize height        if  Build VERSION SDK INT  gt   Build VERSION CODES N  amp  amp    Activity  mContext  isInMultiWindowMode              if  getResources   getConfiguration   orientation    Configuration ORIENTATION PORTRAIT                      Surface ROTATION 0    rotation    Surface ROTATION 180    rotation                 setMeasuredDimension width   int   width   ratio              else               setMeasuredDimension  int   height   ratio   height                   else           if   Surface ROTATION 0    rotation    Surface ROTATION 180    rotation                 Log e  quot --- quot    quot onMeasure   quot    height    quot  -  quot    width   ratio                 2264 - 2400 0 pix c -- yes               2240 - 2560 0 samsung -- yes               1582 - 1440 0 pix 2 -- no               1864 - 2048 0 sam tab -- yes               848 - 789 4737 iball -- no               1640 - 1600 0 nexus 7 -- no               1093 - 1066 6667 lenovo -- no               if width   ratio is  gt  height  need to minus toolbar height            if   width   ratio   lt  height                  setMeasuredDimension width   int   width   ratio                else                 setMeasuredDimension width   int   width   ratio  - toolbarHeight             else               setMeasuredDimension  int   height   ratio   height                       requestLayout

User · Answer

NOTE  MY SOLUTION IS A CONTINUATION OF HESAM S SOLUTION  https   stackoverflow com a 22758359 1718734  What I address  Hesam s said there is a little white space that may appear on some phones  like this      Hesam suggested a second solution  but that squishes the preview  And on some devices  it heavily distorts   So how do we fix this problem  It is simple   by multiplying the aspect ratios till it fills in the screen  I have noticed  several popular apps such as Snapchat  WhatsApp  etc works the same way   All you have to do is add this to the onMeasure method   float camHeight    int   width   ratio       float newCamHeight      float newHeightRatio       if  camHeight  lt  height            newHeightRatio    float  height    float  mPreviewSize height          newCamHeight    newHeightRatio   camHeight           Log e TAG  camHeight         height         mPreviewSize height         newHeightRatio         newCamHeight           setMeasuredDimension  int   width   newHeightRatio    int  newCamHeight           Log e TAG  mPreviewSize width           mPreviewSize height       ratio -     ratio       H ratio -     newHeightRatio       A width -      width   newHeightRatio        A height -     newCamHeight         else           newCamHeight   camHeight          setMeasuredDimension width   int  newCamHeight           Log e TAG  mPreviewSize width           mPreviewSize height       ratio -     ratio       A width -      width        A height -     newCamHeight           This will calculate the screen height and gets the ratio of the screen height and the mPreviewSize height  Then it multiplies the camera s width and height by the new height ratio and the set the measured dimension accordingly     And the next thing you know  you end up with this  D    This also works well with he front camera  I believe this is the best way to go about this  Now the only thing left for my app is to save the preview itself upon clicking on  Capture   But ya  this is it

User · Answer

i tried all the solution above but none of them works for me  finaly i solved it myself  and find actually it s quite easy  there are two points you need to be careful    parameters setPreviewSize cameraResolution x  cameraResolution y     this previewSize must be one of the camera supported resolution  which can be get as below   List lt Camera Size gt  rawSupportedSizes   parameters getSupportedPreviewSizes       usually one of the rawSupportedSize equals to the device resolution   Second  place your SurfaceView in a FrameLayout and set the surface layout height and width in surfaceChanged method as above  FrameLayout LayoutParams layoutParams    FrameLayout LayoutParams  surfaceView getLayoutParams    layoutParams height   cameraResolution x  layoutParams width   cameraResolution y    Ok  things done  hope this could help you

User · Answer

Just to make this thread more complete i am adding my version of answer   What i wanted to achieve   The surface view shouldn t be stretched  and it should cover the whole screen  Moreover  there was only a landscape mode in my app   Solution   The solution is an extremely small extension to F1sher s solution      First step is to integrate F1sher s solution      Now  there might arise a scenario in F1sher s solution when the surface view doesn t covers the whole screen  The solution is to make the surface view greater than the screen dimensions so that it covers the whole screen  for that       size   getOptimalPreviewSize mCamera getParameters   getSupportedPreviewSizes    screenWidth  screenHeight        Camera Parameters parameters   mCamera getParameters        parameters setPreviewSize size width  size height         mCamera setParameters parameters              double screenRatio    double  screenHeight   screenWidth      double previewRatio    double  size height   size width       if  previewRatio  gt  screenRatio        if preview ratio is greater than screen ratio then we will have to recalculate the surface height while keeping the surface width equal to the screen width                 RelativeLayout LayoutParams params1   new RelativeLayout LayoutParams screenWidth   int   screenWidth   previewRatio            params1 addRule RelativeLayout CENTER IN PARENT           flPreview setLayoutParams params1            flPreview setClipChildren false            LayoutParams surfaceParams   new LayoutParams screenWidth   int   screenWidth   previewRatio            surfaceParams gravity   Gravity CENTER          mPreview setLayoutParams surfaceParams                     else       if preview ratio is smaller than screen ratio then we will have to recalculate the surface width while keeping the surface height equal to the screen height                 RelativeLayout LayoutParams params1   new RelativeLayout LayoutParams  int    double  screenHeight   previewRatio   screenHeight           params1 addRule RelativeLayout CENTER IN PARENT           flPreview setLayoutParams params1           flPreview setClipChildren false            LayoutParams surfaceParams   new LayoutParams  int    double  screenHeight   previewRatio   screenHeight           surfaceParams gravity   Gravity CENTER          mPreview setLayoutParams surfaceParams                      flPreview addView mPreview           The TopMost layout used is the RelativeLayout  flPreview is the FrameLayout in which Surface View is added  mPreview is an instance of a class which extends SurfaceView

User · Answer

I gave up the calculations and simply get the size of the view where I want the camera preview displayed and set the camera s preview size the same  just flipped width height due to rotation  in my custom SurfaceView implementation    Override    CameraPreview extends SurfaceView implements SurfaceHolder Callback    public void surfaceChanged SurfaceHolder holder  int format  int width  int height         Display display     WindowManager  getContext   getSystemService              Context WINDOW SERVICE   getDefaultDisplay         if  display getRotation      Surface ROTATION 0            final Camera Parameters params   camera getParameters               viewParams is from the view where the preview is displayed         params setPreviewSize viewParams height  viewParams width           camera setDisplayOrientation 90           requestLayout            camera setParameters params                I do not enable rotation  so this can otherwise stay as is

User · Answer

Hi the getOptimalPreview   that is here didn t worked for me so I want to share my version   private Camera Size getOptimalPreviewSize List lt Camera Size gt  sizes  int w  int h         if  sizes  null  return null       Camera Size optimalSize   null      double ratio    double h w      double minDiff   Double MAX VALUE      double newDiff      for  Camera Size size   sizes            newDiff   Math abs  double size width size height - ratio           if  newDiff  lt  minDiff                optimalSize   size              minDiff   newDiff                      return optimalSize

User · Answer

My requirements are the camera preview need to be fullscreen and keep the aspect ratio  Hesam and Yoosuf s solution was great but I do see a high zoom problem for some reason    The idea is the same  have the preview container center in parent and increase the width or height depend on the aspect ratios until it can cover the entire screen   One thing to note is the preview size is in landscape because we set the display orientation      camera setDisplayOrientation 90     The container that we will add the SurfaceView view to    lt RelativeLayout     android id    id camera preview container      android layout width  match parent      android layout height  match parent      android layout centerInParent  true   gt    Add the preview to it s container with center in parent in your activity   this cameraPreview   new CameraPreview this  camera   cameraPreviewContainer removeAllViews    RelativeLayout LayoutParams params   new RelativeLayout LayoutParams      ViewGroup LayoutParams MATCH PARENT  ViewGroup LayoutParams MATCH PARENT   params addRule RelativeLayout CENTER IN PARENT  RelativeLayout TRUE   cameraPreviewContainer addView cameraPreview  0  params     Inside the CameraPreview class    Override public void surfaceChanged SurfaceHolder holder  int format  int width  int height           If your preview can change or rotate  take care of those events here         Make sure to stop the preview before resizing or reformatting it       if  holder getSurface      null               preview surface does not exist         return             stopPreview            set preview size and make any resize  rotate or        reformatting changes here     try           Camera Size nativePictureSize   CameraUtils getNativeCameraPictureSize camera           Camera Parameters parameters   camera getParameters            parameters setPreviewSize optimalSize width  optimalSize height           parameters setPictureSize nativePictureSize width  nativePictureSize height           camera setParameters parameters           camera setDisplayOrientation 90           camera setPreviewDisplay holder           camera startPreview           catch  Exception e           Log d TAG   Error starting camera preview      e getMessage               Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        final int width   resolveSize getSuggestedMinimumWidth    widthMeasureSpec       final int height   resolveSize getSuggestedMinimumHeight    heightMeasureSpec        if  supportedPreviewSizes    null  amp  amp  optimalSize    null            optimalSize   CameraUtils getOptimalSize supportedPreviewSizes  width  height           Log i TAG   optimal size      optimalSize width    w      optimalSize height    h               float previewRatio     float  optimalSize height    float  optimalSize width         previewRatio is height width because camera preview size are in landscape      float measuredSizeRatio    float  width    float  height       if  previewRatio  gt   measuredSizeRatio            measuredHeight   height          measuredWidth    int    float height   previewRatio         else           measuredWidth   width          measuredHeight    int    float width   previewRatio             Log i TAG   Preview size      width    w      height    h        Log i TAG   Preview size calculated      measuredWidth    w      measuredHeight    h         setMeasuredDimension measuredWidth  measuredHeight

User · Answer

I figured out what s the problem - it is with orientation changes  If you change camera orientation to 90 or 270 degrees than you need to swap width and height of supported sizes and all will be ok   Also surface view should lie in a frame layout and have center gravity   Here is example on C   Xamarin    public void SurfaceChanged ISurfaceHolder holder  Android Graphics Format format  int width  int height         camera StopPreview            find best supported preview size      var parameters    camera GetParameters        var supportedSizes   parameters SupportedPreviewSizes      var bestPreviewSize   supportedSizes          Select x   gt  new   Width   x Height  Height   x Width  Original   x       HACK swap height and width because of changed orientation to 90 degrees          OrderBy x   gt  Math Pow Math Abs x Width - width   3    Math Pow Math Abs x Height - height   2            First         if  height    bestPreviewSize Height  amp  amp  width    bestPreviewSize Width                   start preview if best supported preview size equals current surface view size          parameters SetPreviewSize bestPreviewSize Original Width  bestPreviewSize Original Height            camera SetParameters parameters            camera StartPreview              else                  if not than change surface view size to best supported  SurfaceChanged will be called once again           var layoutParameters    surfaceView LayoutParameters          layoutParameters Width   bestPreviewSize Width          layoutParameters Height   bestPreviewSize Height           surfaceView LayoutParameters   layoutParameters            Pay attention that camera parameters should be set as original size  not swapped   and surface view size should be swapped

User · Answer

F1Sher s solution is nice but sometimes doesn t work  Particularly  when your surfaceView doesn t cover whole screen  In this case you need to override onMeasure   method  I have copied my code here for your reference    Since I measured surfaceView based on width then I have little bit white gap at the end of my screen that I filled it by design  You are able to fix this issue if you keep height and increase width by multiply it to ratio  However  it will squish surfaceView slightly    public class CameraPreview extends SurfaceView implements SurfaceHolder Callback        private static final String TAG    CameraPreview        private Context mContext      private SurfaceHolder mHolder      private Camera mCamera      private List lt Camera Size gt  mSupportedPreviewSizes      private Camera Size mPreviewSize       public CameraPreview Context context  Camera camera            super context           mContext   context          mCamera   camera              supported preview sizes         mSupportedPreviewSizes   mCamera getParameters   getSupportedPreviewSizes            for Camera Size str  mSupportedPreviewSizes                  Log e TAG  str width         str height               Install a SurfaceHolder Callback so we get notified when the            underlying surface is created and destroyed          mHolder   getHolder            mHolder addCallback this              deprecated setting  but required on Android versions prior to 3 0         mHolder setType SurfaceHolder SURFACE TYPE PUSH BUFFERS              public void surfaceCreated SurfaceHolder holder               empty  surfaceChanged will take care of stuff            public void surfaceDestroyed SurfaceHolder holder               empty  Take care of releasing the Camera preview in your activity             public void surfaceChanged SurfaceHolder holder  int format  int w  int h            Log e TAG   surfaceChanged   gt  w     w      h     h              If your preview can change or rotate  take care of those events here             Make sure to stop the preview before resizing or reformatting it          if  mHolder getSurface      null                  preview surface does not exist             return                        stop preview before making changes         try               mCamera stopPreview              catch  Exception e                  ignore  tried to stop a non-existent preview                       set preview size and make any resize  rotate or reformatting changes here            start preview with new settings         try               Camera Parameters parameters   mCamera getParameters                parameters setPreviewSize mPreviewSize width  mPreviewSize height               mCamera setParameters parameters               mCamera setDisplayOrientation 90               mCamera setPreviewDisplay mHolder               mCamera startPreview               catch  Exception e               Log d TAG   Error starting camera preview      e getMessage                           Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            final int width   resolveSize getSuggestedMinimumWidth    widthMeasureSpec           final int height   resolveSize getSuggestedMinimumHeight    heightMeasureSpec            if  mSupportedPreviewSizes    null                mPreviewSize   getOptimalPreviewSize mSupportedPreviewSizes  width  height                      if  mPreviewSize  null                float ratio              if mPreviewSize height  gt   mPreviewSize width                  ratio    float  mPreviewSize height    float  mPreviewSize width              else                 ratio    float  mPreviewSize width    float  mPreviewSize height                  One of these methods should be used  second method squishes preview slightly             setMeasuredDimension width   int   width   ratio                setMeasuredDimension  int   width   ratio   height                        private Camera Size getOptimalPreviewSize List lt Camera Size gt  sizes  int w  int h            final double ASPECT TOLERANCE   0 1          double targetRatio    double  h   w           if  sizes    null              return null           Camera Size optimalSize   null          double minDiff   Double MAX VALUE           int targetHeight   h           for  Camera Size size   sizes                double ratio    double  size height   size width              if  Math abs ratio - targetRatio   gt  ASPECT TOLERANCE                  continue               if  Math abs size height - targetHeight   lt  minDiff                    optimalSize   size                  minDiff   Math abs size height - targetHeight                                    if  optimalSize    null                minDiff   Double MAX VALUE              for  Camera Size size   sizes                    if  Math abs size height - targetHeight   lt  minDiff                        optimalSize   size                      minDiff   Math abs size height - targetHeight                                                      return optimalSize

User · Answer

You must set cameraView getLayoutParams   height and cameraView getLayoutParams   width according to the aspect ratio you want

User · Answer

OK  so I think there is no sufficient answer for general camera preview stretching problem  Or at least I didn t find one  My app also suffered this stretching syndrome and it took me a while to puzzle together a solution from all the user answers on this portal and internet   I tried  Hesam s solution but it didn t work and left my camera preview majorly distorted   First I show the code of my solution  the important parts of the code  and then I explain why I took those steps  There is room for performance modifications   Main activity xml layout    lt RelativeLayout      android id    id main layout      android layout width  match parent      android layout height  match parent      android orientation  horizontal   gt        lt FrameLayout         android id    id camera preview          android layout centerInParent  true          android layout width  match parent          android layout height  match parent        gt   lt  RelativeLayout gt    Camera Preview   public class CameraPreview extends SurfaceView implements SurfaceHolder Callback    private SurfaceHolder prHolder  private Camera prCamera  public List lt Camera Size gt  prSupportedPreviewSizes  private Camera Size prPreviewSize    SuppressWarnings  deprecation   public YoCameraPreview Context context  Camera camera        super context       prCamera   camera       prSupportedPreviewSizes   prCamera getParameters   getSupportedPreviewSizes         prHolder   getHolder        prHolder addCallback this       prHolder setType SurfaceHolder SURFACE TYPE PUSH BUFFERS      public void surfaceCreated SurfaceHolder holder        try           prCamera setPreviewDisplay holder           prCamera startPreview          catch  IOException e            Log d  Yologram    Error setting camera preview      e getMessage              public void surfaceDestroyed SurfaceHolder holder       public void surfaceChanged SurfaceHolder holder  int format  int w  int h        if  prHolder getSurface      null         return             try           prCamera stopPreview          catch  Exception e              try           Camera Parameters parameters   prCamera getParameters            List lt String gt  focusModes   parameters getSupportedFocusModes            if  focusModes contains Camera Parameters FOCUS MODE AUTO                 parameters setFocusMode Camera Parameters FOCUS MODE AUTO                     parameters setPreviewSize prPreviewSize width  prPreviewSize height            prCamera setParameters parameters           prCamera setPreviewDisplay prHolder           prCamera startPreview           catch  Exception e           Log d  Yologram    Error starting camera preview      e getMessage               Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec         final int width   resolveSize getSuggestedMinimumWidth    widthMeasureSpec       final int height   resolveSize getSuggestedMinimumHeight    heightMeasureSpec        setMeasuredDimension width  height        if  prSupportedPreviewSizes    null            prPreviewSize                getOptimalPreviewSize prSupportedPreviewSizes  width  height                public Camera Size getOptimalPreviewSize List lt Camera Size gt  sizes  int w  int h         final double ASPECT TOLERANCE   0 1      double targetRatio    double  h   w       if  sizes    null          return null       Camera Size optimalSize   null      double minDiff   Double MAX VALUE       int targetHeight   h       for  Camera Size size   sizes            double ratio    double  size width   size height          if  Math abs ratio - targetRatio   gt  ASPECT TOLERANCE              continue           if  Math abs size height - targetHeight   lt  minDiff                optimalSize   size              minDiff   Math abs size height - targetHeight                        if  optimalSize    null            minDiff   Double MAX VALUE          for  Camera Size size   sizes                if  Math abs size height - targetHeight   lt  minDiff                    optimalSize   size                  minDiff   Math abs size height - targetHeight                                      return optimalSize        Main activity   public class MainActivity extends Activity          SuppressLint  NewApi    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState            setContentView R layout activity main            maCamera   getCameraInstance             maLayoutPreview    FrameLayout  findViewById R id camera preview            maPreview   new CameraPreview this  maCamera            Point displayDim   getDisplayWH            Point layoutPreviewDim   calcCamPrevDimensions displayDim                   maPreview getOptimalPreviewSize maPreview prSupportedPreviewSizes                       displayDim x  displayDim y            if  layoutPreviewDim    null                RelativeLayout LayoutParams layoutPreviewParams                     RelativeLayout LayoutParams  maLayoutPreview getLayoutParams                layoutPreviewParams width   layoutPreviewDim x              layoutPreviewParams height   layoutPreviewDim y              layoutPreviewParams addRule RelativeLayout CENTER IN PARENT               maLayoutPreview setLayoutParams layoutPreviewParams                     maLayoutPreview addView maPreview       SuppressLint  NewApi    SuppressWarnings  deprecation   private Point getDisplayWH          Display display   this getWindowManager   getDefaultDisplay        Point displayWH   new Point         if  Build VERSION SDK INT  gt   Build VERSION CODES HONEYCOMB MR2            display getSize displayWH           return displayWH            displayWH set display getWidth    display getHeight         return displayWH     private Point calcCamPrevDimensions Point disDim  Camera Size camDim         Point displayDim   disDim      Camera Size cameraDim   camDim       double widthRatio    double  displayDim x   cameraDim width      double heightRatio    double  displayDim y   cameraDim height          use   gt   to zoom preview full screen     if  widthRatio  lt  heightRatio            Point calcDimensions   new Point            calcDimensions x   displayDim x          calcDimensions y    displayDim x   cameraDim height    cameraDim width          return calcDimensions               use   lt   to zoom preview full screen     if  widthRatio  gt  heightRatio             Point calcDimensions   new Point            calcDimensions x    displayDim y   cameraDim width    cameraDim height          calcDimensions y   displayDim y          return calcDimensions            return null           My commentary   The point of all this is  that although you calculate the optimal camera size in getOptimalPreviewSize   you only pick the closest ratio to fit your screen  So unless the ratio is exactly the same the preview will stretch   Why will it stretch  Because your FrameLayout camera preview is set in layout xml to match parent in width and height  So that is why the preview will stretch to full screen   What needs to be done is to set camera preview layout width and height to match the chosen camera size ratio  so the preview keeps its aspect ratio and won t distort   I tried to use the CameraPreview class to do all the calculations and layout changes  but I couldn t figure it out  I tried to apply this solution  but SurfaceView doesn t recognize getChildCount    or getChildAt  int index   I think  I got it working eventually with a reference to maLayoutPreview  but it was misbehaving and applied the set ratio to my whole app and it did so after first picture was taken  So I let it go and moved the layout modifications to the MainActivity   In CameraPreview I changed prSupportedPreviewSizes and getOptimalPreviewSize   to public so I can use it in MainActivity  Then I needed the display dimensions  minus the navigation status bar if there is one  and chosen optimal camera size  I tried to get the RelativeLayout  or FrameLayout  size instead of display size  but it was returning zero value  This solution didn t work for me  The layout got it s value after onWindowFocusChanged  checked in the log    So I have my methods for calculating the layout dimensions to match the aspect ratio of chosen camera size  Now you just need to set LayoutParams of your camera preview layout  Change the width  height and center it in parent   There are two choices how to calculate the preview dimensions  Either you want it to fit the screen with black bars  if windowBackground is set to null  on the sides or top bottom  Or you want the preview zoomed to full screen  I left comment with more information in calcCamPrevDimensions

User · Answer

I m using this method -  based on API Demos to get my Preview Size   private Camera Size getOptimalPreviewSize List lt Camera Size gt  sizes  int w  int h            final double ASPECT TOLERANCE   0 1          double targetRatio  double h   w           if  sizes    null  return null           Camera Size optimalSize   null          double minDiff   Double MAX VALUE           int targetHeight   h           for  Camera Size size   sizes                double ratio    double  size width   size height              if  Math abs ratio - targetRatio   gt  ASPECT TOLERANCE  continue              if  Math abs size height - targetHeight   lt  minDiff                    optimalSize   size                  minDiff   Math abs size height - targetHeight                                    if  optimalSize    null                minDiff   Double MAX VALUE              for  Camera Size size   sizes                    if  Math abs size height - targetHeight   lt  minDiff                        optimalSize   size                      minDiff   Math abs size height - targetHeight                                                     return optimalSize          As you can see you have to input width and height of your screen  This method will calculate screen ratio based on those values and then from the list of supportedPreviewSizes it will choose the best for you from avaliable ones  Get your supportedPreviewSize list in place where Camera object isn t null by using    mSupportedPreviewSizes   mCamera getParameters   getSupportedPreviewSizes      And then on in onMeasure you can get your optimal previewSize like that    Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            final int width   resolveSize getSuggestedMinimumWidth    widthMeasureSpec           final int height   resolveSize getSuggestedMinimumHeight    heightMeasureSpec           setMeasuredDimension width  height            if  mSupportedPreviewSizes    null               mPreviewSize   getOptimalPreviewSize mSupportedPreviewSizes  width  height                     And then  in my code in surfaceChanged method  like I said I m using API Demos structure of CameraActivity code  you can generate it in Eclipse    Camera Parameters parameters   mCamera getParameters    parameters setPreviewSize mPreviewSize width  mPreviewSize height   mCamera setParameters parameters   mCamera startPreview      And one hint for you  because I did almost the same app like you  Good practice for Camera Activity is to hide StatusBar  Applications like Instagram are doing it  It reduces your screen height value and change your ratio value  It is possible to get strange Preview Sizes on some devices  your SurfaceView will be cut a little     And to answer your question  how to check if your preview ratio is correct  Then get height and width of parameters that you set in   mCamera setParameters parameters     your set ratio is equal to height width  If you want camera to look good on your screen then height width ratio of parameters that you set to camera must be the same as height minus status bar  width ratio of your screen

[android] Android Camera Preview Stretched

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