surfaceview screenshot (camera screenshot)

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surfaceView Example

Surface view often use for Camera preview.

Because Camera preview need many load. 

So, if you capture your phone, camera does'n capture.

May be just black image!!

I tried below image.

But I get just overlay and black display.

So I use camera preview callback!!

First, sufaceview

1. public class SurfacePreview extends SurfaceView implements SurfaceHolder.Callback{
2.    
3.     SurfaceHolder holder;   
4.     Camera cam=null;       //camera
5.    
6.     public SurfacePreview(Context context, AttributeSet attrs) {
7.         super(context, attrs);
8.         init(context);
9.     }
10.     public SurfacePreview(Context context) {
11.         super(context);
12.         init(context);
13.     }
14.     public void init(Context context){
15.        
16.         holder=getHolder();
17.         holder.addCallback(this);
18.         if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
19.             getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
20.        
21.        
22.     }
23.     @Override
24.     public void surfaceChanged(SurfaceHolder holder, int format, int width,
25.             int height) {
26.         cam.setDisplayOrientation(90);      //portrait
27.         cam.startPreview();                 //preview start
28.        
29.     }
30.     @Override
31.     public void surfaceCreated(SurfaceHolder holder) {
32.         cam=Camera.open();                  //open camera object(need camera permission)
33.         try{
34.             cam.setPreviewDisplay(holder);  
35.         }catch(Exception e){
36.             e.printStackTrace();
37.         }
38.     }
39.     @Override
40.     public void surfaceDestroyed(SurfaceHolder holder) {
41.         cam.stopPreview();
42.         cam.release();                      
43.         cam=null;
44.        
45.     }  
46. }

This is my old code.

I add implement Camera.PreviewCallback!!

1. public class SurfacePreview extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback

Add onPreviewFrame method.

1.     @Override
2.     public void onPreviewFrame(byte[] data, Camera camera) {
3.        
4.         Camera.Parameters params = camera.getParameters();
5.         int w = params.getPreviewSize().width;
6.             int h = params.getPreviewSize().height;
7.             int format = params.getPreviewFormat();
8.             YuvImage image = new YuvImage(data, format, w, h, null);
10.             ByteArrayOutputStream out = new ByteArrayOutputStream();
11.             Rect area = new Rect(0, 0, w, h);
12.             image.compressToJpeg(area, 100, out);
13.             Bitmap bm = BitmapFactory.decodeByteArray(out.toByteArray(), 0, out.size());
14.            
15.             Matrix matrix = new Matrix();
16.         matrix.postRotate(90);
17.         Bitmap rotatedBitmap = Bitmap.createBitmap(bm, 0, 0,w, h, matrix, true);
18.             camWeather.shareBitmap=rotatedBitmap;
19.     }

onPreviewFrame auto callback!!

Line 4~13: camera preview transform to bitmap.

Line 15~17: bitmap rotate because I captured potrait(see surfaceview line 26)

Line 18 : need for combine to overlay.

Add to surfaceCreated for start preview callback

1. cam.setPreviewCallback(this);

Add to surfaceDestroyed for anti method called after release() exception.

1. cam.setPreviewCallback(null);

This code is combine to overlay.

1.     public void capture(){
2.         Bitmap overlay=Bitmap.createBitmap(shareBitmap.getWidth(),shareBitmap.getHeight(),shareBitmap.getConfig());
3.         Canvas canvas=new Canvas(overlay);
4.         canvas.drawBitmap(shareBitmap, 0,0, null);
5.         shareLayout.buildDrawingCache();
6.         Bitmap bm=shareLayout.getDrawingCache();
7.         canvas.drawBitmap(bm,0,0,null);
8.         FileOutputStream out;
9.        
10.         String filename=System.currentTimeMillis()+".jpg";
11.         String temp="/"+filename;
12.        
13.         try{
14.             out=new FileOutputStream(Environment.getExternalStorageDirectory().toString()+temp);
15.             overlay.compress(Bitmap.CompressFormat.JPEG,100, out);
16.             Toast.makeText(getApplicationContext(),temp, Toast.LENGTH_SHORT).show();
17.         }catch(Exception e){
18.             Log.d("screenshot",String.valueOf(e));
19.             e.printStackTrace();
20.            
21.         }
23.        
24.     }

Line 2,4 shareBitmap: camera bitmap from camera preview callback 

Line 2~3 : Setting new bitmap feature then draw canvas.

Line 4 : draw camerapreview to new bitmap.

Line 5~6 : capture overlay layout 

Line 7 : draw overlay to new bitmap.

Line 8~ : save to jpg file.

 This is run this code.!!