Android camera capture bitmap

Question

In my android coding I have a camera surface view class, when I show the preview for this camera class it's a live camera scene, but how can I create a function that create a bitmap for the camera current frame? So I can get the captured bitmap from other class.

Any guidance will be appreciated~

This is my camera class coding:

import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;

public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback {

Camera mCamera;
boolean isPreviewRunning = false;

CameraSurfaceView(Context context) {
    super(context);
    SurfaceHolder mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

public void surfaceCreated(SurfaceHolder holder) {
    synchronized(this) {
        mCamera = Camera.open();
        try {
            mCamera.setPreviewDisplay(holder);
        } catch (IOException e) {
            Log.e("Camera", "mCamera.setPreviewDisplay(holder);");
        }
        mCamera.setDisplayOrientation(90);
        mCamera.startPreview();

    }
}

public void surfaceDestroyed(SurfaceHolder holder) {
    synchronized(this) {
        try {
            if (mCamera!=null) {
                mCamera.stopPreview();
                isPreviewRunning=false;
                mCamera.release();
            }
        } catch (Exception e) {
            Log.e("Camera", e.getMessage());
        }
    }
}

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

}

}

Youngjae · Accepted Answer · 2015-10-13T04:23:13.723

1

Note that below codes are for capturing image with its displayed pixels, not for taking camera. It means, the result image will give actual pixel size of the screen (ie, 1080x768), not multi-megapixel high resolution image of the Camera app. If you want to take an image as Camera app provided, use takePicture method.

In order to capture live preview image in SurfaceView,

public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
    private static final String TAG = "CameraSurfaceView";

    private SurfaceHolder mSurfaceHolder;
    private Camera mCamera = null;
    private Bitmap mBitmap;
    private Context mContext;
    private Camera.Parameters mParameters;
    private byte[] byteArray;
    private List<Camera.Size> mSupportedPreviewSizes;
    private Camera.Size mPreviewSize;

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

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

    public CameraSurfaceView (Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;

        try {
            mSurfaceHolder = getHolder();
            mSurfaceHolder.addCallback(this);
            mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceCreated(final SurfaceHolder surfaceHolder) {
        if (mCamera == null) {
            try {
                mCamera = Camera.open();
            } catch (RuntimeException ignored) {
            }
        }

        try {
            if (mCamera != null) {
                WindowManager winManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
                mCamera.setPreviewDisplay(mSurfaceHolder);
            }
        } catch (Exception e) {
            if (mCamera != null)
                mCamera.release();
            mCamera = null;
        }

        if (mCamera == null) {
                return;
        } else {
            mCamera.setPreviewCallback(new Camera.PreviewCallback() {
                @Override
                public void onPreviewFrame(byte[] bytes, Camera camera) {
                    if (mParameters == null)
                    {
                        return;
                    }
                    byteArray = bytes;
                }
            });
        }

        setWillNotDraw(false);
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {
        try {
            mParameters = mCamera.getParameters();

            List<Size> cameraSize = mParameters.getSupportedPreviewSizes();
            mPreviewSize = cameraSize.get(0);

            for (Size s : cameraSize) {
                if ((s.width * s.height) > (mPreviewSize.width * mPreviewSize.height)) {
                    mPreviewSize = s;
                }
            }

            mParameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
            mCamera.setParameters(mParameters);
            mCamera.startPreview();

        } catch (Exception e) {
            if (mCamera != null) {
                mCamera.release();
                mCamera = null;
            }
        }
    }


    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        if (mCamera != null) {
            mCamera.setPreviewCallback(null);
            mCamera.stopPreview();
            mCamera.release();
            mCamera = null;
        }
    }

    public Bitmap getBitmap() {
        try {
            if (mParameters == null)
                return null;

            if (mPreviewSize == null)
                return null;

            int format = mParameters.getPreviewFormat();
            YuvImage yuvImage = new YuvImage(byteArray, format, mPreviewSize.width, mPreviewSize.height, null);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

            Rect rect = new Rect(0, 0, mPreviewSize.width, mPreviewSize.height);

            yuvImage.compressToJpeg(rect, 75, byteArrayOutputStream);
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inPurgeable = true;
            options.inInputShareable = true;
            mBitmap = BitmapFactory.decodeByteArray(byteArrayOutputStream.toByteArray(), 0, byteArrayOutputStream.size(), options);

            byteArrayOutputStream.flush();
            byteArrayOutputStream.close();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }

        return mBitmap;
    }

    public Camera getCamera() {
        return mCamera;
    }
}

edited Oct 13 '15 at 04:23

answered Oct 13 '15 at 02:13

Youngjae

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what means if I missed the mPreviewSize? – Le Parkour Oct 13 '15 at 02:16
@LeParkour // sorry for my short English. the description editted. – Youngjae Oct 13 '15 at 02:18
In the getBitmap function cannot resolve byteArray symbol – Le Parkour Oct 13 '15 at 02:27
@LeParkour // editted. just define `byte[] byteArray` – Youngjae Oct 13 '15 at 02:29
Sir, when I call the getBitmap function I get java.lang.NullPointerException error – Le Parkour Oct 13 '15 at 02:46
@LeParkour // which line or field did you get? – Youngjae Oct 13 '15 at 02:48
I get error in another class like this: newBitmap = cameraclass.getBitmap(); – Le Parkour Oct 13 '15 at 02:50
@LeParkour // Call ` cameraclass.getBitmap().startPreview();` once again in _another class_. Or, I recommend you to find which line make it returns _null_ in cameraclass. – Youngjae Oct 13 '15 at 02:55
sorry my mistake I forget to put this line cameraclass = new CameraSurfaceView(context); and now I get new error line which is the mParameters = mCamera.getParameters(); – Le Parkour Oct 13 '15 at 03:00
@LeParkour // Note that, you have to test it with real device. Or, more than three device as Camera api is really unstable and usually throw `RuntimeException`. – Youngjae Oct 13 '15 at 03:05
Ya, i using real device to run it, but i get error in line mParameters = mCamera.getParameters(); – Le Parkour Oct 13 '15 at 03:07
java.lang.NullPointerException at com.etoff.appsopengl.CameraSurfaceView.getBitmap(CameraSurfaceView.java: line 33 mParameters = mCamera.getParameters();) – Le Parkour Oct 13 '15 at 03:11
@LeParkour // add my `surfaceCreated` method. hope it can solve your problem. – Youngjae Oct 13 '15 at 03:17
Sorry I forget to update my surface created code, it's by following your code? – Le Parkour Oct 13 '15 at 03:20
@LeParkour // yes, my code. let me remove listener that you do not have. – Youngjae Oct 13 '15 at 03:22
@LeParkour // fixed. sorry. – Youngjae Oct 13 '15 at 03:24
this time more worse the camera can't start error line was mCamera.setPreviewCallback(new Camera.PreviewCallback() { – Le Parkour Oct 13 '15 at 03:27
where should I put this 2 lines? mCamera.setDisplayOrientation(90); mCamera.startPreview(); – Le Parkour Oct 13 '15 at 03:34
that's almost all of my code. Do not just copy and paste. I recommend you to read line by line and adopt to yours. – Youngjae Oct 13 '15 at 03:42
mParameters = mCamera.getParameters(); this is still the error – Le Parkour Oct 13 '15 at 03:53
Please try with other devices. Or, clean all processes before running your app. – Youngjae Oct 13 '15 at 04:00
@LeParkour // I hardly find your error. but let me give you ALL of my code. Whatever you have error, I do not know afterwards. – Youngjae Oct 13 '15 at 04:24
Ya, It's work, but the capture image is empty 0 bytes – Le Parkour Oct 13 '15 at 05:41
Sir can u tell me how you call getbitmap function in other class? why i get a zero empty picture? – Le Parkour Oct 15 '15 at 03:37
Did you check `mPreviewSize.width, mPreviewSize.height` give values well? or, did you check every point of variables such as `format`, `byteArray`, `yuvImage`, `byteArrayOutputStream`? – Youngjae Oct 15 '15 at 03:41
I tried manually change the mPreviewSize.width, mPreviewSize.height but still get same empty bitmap – Le Parkour Oct 15 '15 at 03:45
what about other variables? – Youngjae Oct 15 '15 at 03:48
If I call like this ok? CameraSurfaceView csv; csv = new CameraSurfaceView(getContext()); imgB = csv.getBitmap(); – Le Parkour Oct 15 '15 at 03:56
Sir thanks alot, now totally worked...... last time is null because i call a empty camera view.... but now I have a new problem again that's the captured image is rotated landscape, my android manifest is portrait, but i dunwan to change my android manifest, any way to rotate the camera? im using setDisplayOrientation but the raw data not changed – Le Parkour Oct 28 '15 at 17:19
@LeParkour // that's out of this question topic. you may post a question again for that. – Youngjae Oct 29 '15 at 01:43
but do you have solution for this, this question in stackoverflow people asked before, but when i use the solution the output image i get is distorted with some green color – Le Parkour Oct 29 '15 at 02:04
they rotate the byte array – Le Parkour Oct 29 '15 at 02:04
@LeParkour // similar to that. I'm using `matrix.postRotate(degree);` for rotating image. – Youngjae Oct 29 '15 at 02:19
this method just rotate the image angle view, i mean my problem is totally stretch inside the camera, the raw data byte array is not following the setdisplayorientation to 90 when capture – Le Parkour Oct 29 '15 at 02:50
@LeParkour // hello, ask in another question or link what you asked please. this is out of focus in this context. – Youngjae Oct 29 '15 at 02:52
Great! Works like a charm! – Feb 02 '19 at 10:41

Android camera capture bitmap

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