Develop Reference

Can not take texture view screenshot in android

I have a texture view on which a video is getting played. I need to take screenshot of the frame of playing video. Earlier I was using a method
public Bitmap getFrameAsBitmap() {
Bitmap bmp = textureview.getBitmap();
Canvas canvas = new Canvas(bmp);
textureview.draw(canvas);
return bmp;
}
It is working fine on most of the devices but on Samsung M series I can not take screenshot. Only black screen is coming.
Then I tried
public Bitmap getFrameAsBitmap() {
View view = textureview;
view.setDrawingCacheEnabled(true);
Bitmap bmp = Bitmap.createBitmap(view.getWidth(),
view.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmp);
textureview.draw(canvas);
return bmp;
}
But this method is not returning data on any phone. Any ideas what to do?

Here are several things that you can try.
Return the bitmap directly.
public Bitmap getFrameAsBitmap() {
return textureview.getBitmap();
}
Clone the bitmap then return the clone.
public Bitmap getFrameAsBitmap() {
Bitmap bmp = textureview.getBitmap();
Bitmap clone = bmp.copy(Bitmap.Config.ARGB_8888, true);
return clone;
}
Draw the bitmap on a new canvas.
public Bitmap getFrameAsBitmap() {
Bitmap bmp = textureview.getBitmap();
//Try using bitmap's width/height first, if it does not work, use view's width/height instead.
Bitmap newBmp = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), Bitmap.Config.ARGB_8888);
//Bitmap newBmp = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newBmp);
//It is not efficient to create a Paint object too often. Better make it as global variable.
canvas.drawBitmap(bmp, 0, 0, new Paint(Paint.ANTI_ALIAS_FLAG));
return newBmp;
}

Cannot draw on bitmap loaded canvas

I am trying to create an image save and retrieve feature in android. The code I have for creating a jpg file from canvas is as below
Bitmap bitmap = Bitmap.createBitmap( view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
I am trying to read the jpg file and create image on canvas using
Bitmap bMap = BitmapFactory.decodeStream(buf);
Bitmap workingBitmap = Bitmap.createBitmap(bMap);
Bitmap mutableBitmap = workingBitmap.copy(Bitmap.Config.ARGB_8888, true);
view.mybitmap = mutableBitmap;
view.onDraw(view.Canvas);
The code I have in onDraw is
canvas.drawBitmap(view.mybitmap, 0, 0, view.myPaint);
This draws the bitmap on canvas correctly from the stored jpg file but I am not able to draw anything on the canvas after that. Has it loaded a immutable bitmap image on canvas which I am not able to edit?
Any help will be appreciated! Thanks!

You shouldn't need to be calling the ondraw method directly like you are doing currently. For a custom view class all you should need to be calling is view.invalidate(); This will auto call the ondraw method and re-draw the canvas. You will probably need to update the logic in your ondraw method to handle the cases where you want to draw additional things on the canvas.

Create widget with customview

I'd like to use several CustomViews in my appwidget and thus want to create a bitmap out of every CustomView.
So i tried that with
Bitmap customBitmap = customView.getDrawingCache(true);
remoteViews.setImageViewBitmap(R.id.imageView1, customBitmap );
but it doesn't work at all.
Are there any suggestions?

yes, it is drawn on a canvas
I would do something like this:
public Bitmap createCustomView(){
Bitmap bitmap = Bitmap.createBitmap(BITMAP_WIDTH, BITMAP_HEIGHT, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
// draw on the canvas:
// ...
return bitmap;
}
and then set the Bitmap to the ImageView:
remoteViews.setImageViewBitmap(R.id.imageView1, createCustomView() );

How I use the image of a screenshot?

I want to use the code of this link: How to take a screenshot and share it programmatically to take screenshots of my application. But I want the picture which is produced to use it to change my background, like this Layout.setBackgroundResource(resid).
How I can do this?
Where I will find the image's path to use it to change Background?

First you need the view you want a screen shot of:
View anyView = findViewById(R.id.anyView);
Then use this method to take a screenshot:
public Bitmap screenShot(View view) {
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),
view.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
return bitmap;
}
like this:
Bitmap screenshot = screenShot(anyView);
Bitmaps can't be set as a background image so lets convert it to a drawable:
Drawable drawableScreenshot = new BitmapDrawable(getResources(), screenshot);
Now set it to be the View background:
anyView.setBackgroundDrawable(drawableScreenshot);

Screenshot of the visible part of the page in WebView

In my application is a WebView widget, which opens a big page.
How do I capture the visible part of the page in WebView? capturePicture() is not suitable for it...

public static Bitmap getBitmapForVisibleRegion(WebView webview) {
Bitmap returnedBitmap = null;
webview.setDrawingCacheEnabled(true);
returnBitmap = Bitmap.createBitmap(webview.getDrawingCache());
webview.setDrawingCacheEnabled(false);
return returnedBitmap;
}

Save your webView under bitmap. Then you save bitmap on SD card.
Use this to get your bitmap from webView :
public static Bitmap getBitmapFromView(View view) {
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
Drawable bgDrawable = view.getBackground();
if (bgDrawable!=null)
bgDrawable.draw(canvas);
else
canvas.drawColor(Color.TRANSPARENT);
view.draw(canvas);
return returnedBitmap;
}
Now just save it on SD and it's done