Develop Reference

How to take a screenshot of Android's Surface View?

I want to programatically take screen shot of my game, just as you'd get in Eclipse DDMS.
Screenshot taken through the solution proposed here: How to programmatically take a screenshot in Android? and in most other SO questions only have View elements visible, but not the SurfaceView.
SCREENSHOTS_LOCATIONS = Environment.getExternalStorageDirectory().toString() + "/screenshots/";
// Get root view
View view = activity.getWindow().getDecorView().getRootView();
// Create the bitmap to use to draw the screenshot
final Bitmap bitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(bitmap);
// Get current theme to know which background to use
final Theme theme = activity.getTheme();
final TypedArray ta = theme
.obtainStyledAttributes(new int[] { android.R.attr.windowBackground });
final int res = ta.getResourceId(0, 0);
final Drawable background = activity.getResources().getDrawable(res);
// Draw background
background.draw(canvas);
// Draw views
view.draw(canvas);
// Save the screenshot to the file system
FileOutputStream fos = null;
try {
final File sddir = new File(SCREENSHOTS_LOCATIONS);
if (!sddir.exists()) {
sddir.mkdirs();
}
fos = new FileOutputStream(SCREENSHOTS_LOCATIONS
+ System.currentTimeMillis() + ".jpg");
if (fos != null) {
if (!bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos)) {
Log.d("ScreenShot", "Compress/Write failed");
}
fos.flush();
fos.close();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Any help in this regard would be highly appreciated. Thanks.

I hope this also useful for you. here little difference for the above answer is
for I used glsurfaceview to take the screen shots hen i click the button.
this image is stored in sdcard for mentioned folder :
sdcard/emulated/0/printerscreenshots/image/...images
My Program :
View view_storelayout ;
view_storelayout = findViewById(R.id.gl_surface_view);
button onclick() {
view_storelayout.setDrawingCacheEnabled(true);
view_storelayout.buildDrawingCache(true);
Bitmap bmp = Bitmap.createBitmap(view_storelayout.getDrawingCache());
view_storelayout.setDrawingCacheEnabled(false); // clear drawing cache
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bmp.compress(CompressFormat.JPEG, 90, bos);
byte[] bitmapdata = bos.toByteArray();
ByteArrayInputStream fis = new ByteArrayInputStream(bitmapdata);
final Calendar c=Calendar.getInstance();
long mytimestamp=c.getTimeInMillis();
String timeStamp=String.valueOf(mytimestamp);
String myfile="hari"+timeStamp+".jpeg";
dir_image=new File(Environment.getExternalStorageDirectory()+
File.separator+"printerscreenshots"+File.separator+"image");
dir_image.mkdirs();
try {
File tmpFile = new File(dir_image,myfile);
FileOutputStream fos = new FileOutputStream(tmpFile);
byte[] buf = new byte[1024];
int len;
while ((len = fis.read(buf)) > 0) {
fos.write(buf, 0, len);
}
fis.close();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), "myPath:"
+dir_image.toString(), Toast.LENGTH_SHORT).show();
Log.v("hari", "screenshots:"+dir_image.toString());
}
Note :
But, here i am faced one problem. In this surfaceview , i drawn line and circle
at runtime. after drawn some objects, when i take screenshots , its stored only for
black image like surfaceview is stored as an image.
And also i want to store that surfaceview image as an .dxf format(autocad format).
i tried to stored image file as an .dxf file format.its saved successfully in
autocad format. but, it cant open in autocad software to edit my .dxf file.

The code from the Usman Kurd answer will not work is most cases.
Unless you're rendering H.264 video frames in software with Canvas onto a View, the drawing-cache approach won't work (see e.g. this answer).
You cannot read pixels from the Surface part of the SurfaceView. The basic problem is that a Surface is a queue of buffers with a producer-consumer interface, and your app is on the producer side. The consumer, usually the system compositor (SurfaceFlinger), is able to capture a screen shot because it's on the other end of the pipe.
Take Screenshot of SurfaceView

VuDroid pdf viewer cannot find Bitmap to render or it doesnt render

I am trying to use the VuDroid PDF viewer and I need to take the rendered bitmap and store it as a byte[]. Then I need to convert it back into a Bitmap that can be displayed on a view using something like "canvas.drawBitmap(bitmap, 0, 0, paint);".
I have spent many hours trying to access the Bitmap and I might have done it already, but even if I get the byte[] to return something it still wont render as a Bitmap on the canvas.
Could someone please help me here, I must be missing something. Thank you so much.
I believe it is supposed to accessed via...
PDFPage.java .... public Bitmap renderBitmap(int width, int height, RectF pageSliceBounds)
-or-
through Page.java -or- DocumentView.java -or- DecodeService.java
Like I said I have tried all of these and have gotten results I just cannot see where I am going wrong since I cannot render it to see if the Bitmap was called correctly.
Thank you again :)

The doc says the method returns "null if the image could not be decode." You can try:
byte[] image = services.getImageBuffer(1024, 600);
InputStream is = new ByteArrayInputStream(image);
Bitmap bmp = BitmapFactory.decodeStream(is);
I think This will help you:-
Render a byte[] as Bitmap in Android
How does Bitmap.Save(Stream, ImageFormat) format the data?
Copy image with alpha channel to clipboard with custom background color?

if you want to get each pdf page as independent bitmap you should consider that
VuDroid render the pages,
PDFView only display them.
you should use VuDroid functions.
now you can use this example and create your own codes
Example code : for make bitmap from a specific PDF page
view = (ImageView)findViewById(R.id.imageView1);
pdf_conext = new PdfContext();
PdfDocument d = pdf_conext.openDocument(Environment.getExternalStorageDirectory() + "your PDF path");
PdfPage vuPage = d.getPage(1); // choose your page number
RectF rf = new RectF();
rf.bottom = rf.right = (float)1.0;
Bitmap bitmap = vuPage.renderBitmap(60, 60, rf); //define width and height of bitmap
view.setImageBitmap(bitmap);
for writing this bitmap on SDCARD :
try {
File mediaImage = new File(Environment.getExternalStorageDirectory().toString() + "your path for save thumbnail images ");
FileOutputStream out = new FileOutputStream(mediaImage);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
for retrieve saved image:
File file = new File(Environment.getExternalStorageDirectory().toString()+ "your path for save thumbnail images ");
String path = file.getAbsolutePath();
if (path != null){
view = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(path), YOUR_X, YOUR_Y, false);
}

Try this code to check whether bitmap is properly generating or not
PdfContext pdf_conext = new PdfContext();
PdfDocument d = (PdfDocument) pdf_conext.openDocument(pdfPath);
PdfPage vuPage = (PdfPage) d.getPage(0);
RectF rf = new RectF();
Bitmap bitmap = vuPage.renderBitmap(1000,600, rf);
File dir1 = new File (root.getAbsolutePath() + "/IMAGES");
dir1.mkdirs();
String fname = "Image-"+ 2 +".jpg";
File file = new File (dir1, fname);
if (file.exists ())
file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}

Resaving combined Bitmaps

I am trying to open a bitmap that has already been stored in SdCard as follows:
String imageFilePath= "/sdcard/SoftCopy/"+mybitmap.png;
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
Bitmap loadedWork= BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);
I have a second Bitmap named currentWork. This bitmap is actually the current drawing that has been done. I have combined two bitmaps as follows:
Canvas c = new Canvas(loadedWork);
c.drawBitmap(currentWork, 0, 0, null); //so that currentWork get drawn on loadedWork
Now i am saving the combined bitmap (now in loadedWork) to file as follows:
try {
final FileOutputStream out = new FileOutputStream(new File("/sdcard/SoftCopy" + "/mybitmap.png"));
loadedWork.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
return true;
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
THE problem is that the combined bitmap(loadedWork) gets saved as png file for 1st time and i am able to load it, however WHEN I AGAIN TRY TO SAVE AFTER MAKING SOME MODIFICATIOns, then the application crashes. Can someone tell me how can I be able to resave the combined bitmap.

Screenshot of a webpage with Flash elements

I would like to take a screenshot of a page displayed in a WebView. The page contains flash elements - and here is the problem. When I take a screenshot all the flash parts of the page are blank.
I am using this piece of code to take a screenshot:
WebView webView = (WebView) findViewById(R.id.webview);
Picture picture = webView.capturePicture();
Bitmap screenshot = Bitmap.createBitmap(picture.getWidth(),
picture.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(screenshot);
picture.draw(c);
File file = new File("/sdcard/screenshot.jpg");
FileOutputStream ostream = null;
try {
file.createNewFile();
ostream = new FileOutputStream(file);
screenshot.compress(CompressFormat.JPEG, 90, ostream);
Log.d("Test", "Screenshot taken");
} catch (Exception e) {
Log.e("Test", "Error", e);
} finally {
try {
ostream.close();
} catch (IOException ignore) {
}
}
I was also trying to acquire Bitmap of the screen contents using the solution given in this SO question:
View webView = findViewById(R.id.webview);
Bitmap bitmap = webView.getDrawingCache();
This also doesn't work - the result is the same (i.e. blank flash elements).
So the question is: How to take a screenshot of WebView contents also with flash elements?

Drawing offscreen WebView to bitmap

I am trying to capture a image of a webview drawn off screen to the user in android and i always end up with a black image. It is the correct size and everything just not the
Here is the code I am using:
String theURL = "file:///android_asset/www/pages/page2.html";
WebView webview = new WebView(ctx);
webview.loadUrl(theURL);
Bitmap bm = Bitmap.createBitmap(1000, 1000, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bm);
webview.draw(c);
OutputStream stream = null;
try {
stream = new FileOutputStream(Environment.getExternalStorageDirectory() +"/page.jpg");
bm.compress(CompressFormat.JPEG, 80, stream);
if (stream != null) stream.close();
return new PluginResult(PluginResult.Status.OK);
} catch (IOException e) {
return new PluginResult(PluginResult.Status.ERROR, e.toString());
} finally {
bm.recycle();
}
Thanks if anyone can help.

The webview.loadUrl(theURL); starts the loading of the page, that can take a while. Wait before drawing your webview until after the page is loaded. You can use a setWebViewClient(WebViewClient client) to set up an object to receive notice when the page has finished loading.