How to Save the drawing canvas in android?

Question

I am using this API demo of the Developer site, THIS DEMO.

But i am wonder that how to save that image in to My Andrtoid Device. Is please anyone give the Code to save that drawn image to the Android Device.

Thanks.

Answer 1

try this code

View content = your_view;
content.setDrawingCacheEnabled(true);
content.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
Bitmap bitmap = content.getDrawingCache();
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
File file = new File(path+"/image.png");
FileOutputStream ostream;
try {
    file.createNewFile();
    ostream = new FileOutputStream(file);
    bitmap.compress(CompressFormat.PNG, 100, ostream);
    ostream.flush();
    ostream.close();
    Toast.makeText(getApplicationContext(), "image saved", 5000).show();
} catch (Exception e) {
    e.printStackTrace();
    Toast.makeText(getApplicationContext(), "error", 5000).show();
}

Answer 2

drawView.setDrawingCacheEnabled(true);
Bitmap bm = null;
drawView.destroyDrawingCache();
bm=drawView.getDrawingCache();

Then write the bitmap to file using bitmap factory.

Answer 3

I have implemented the below approach & worked for me. Get your CustomView by using its id from xml file but not by instantiating the Customview.

 View v = findViewById(R.id.custom_view); //don't get customview by this way, View v = new CustomView(this); int canvasWidth = v.getWidth(); int canvasHeight = v.getHeight(); Bitmap bitmap = Bitmap.createBitmap(canvasWidth, canvasHeight, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); v.draw(canvas); ImageView imageView = findViewById(R.id.image_view); imageView.setImageBitmap(bitmap);

All code should be inside saveButton click listener.

Answer 4

One option is create another Canvas (as shown below) and repeat all your drawing on this new canvas. Once done, call drawBitmap.

Bitmap bitmap = new Bitmap(// Set the params you like //);
Canvas canvas = new Canvas(bitmap);

// Do all your drawings here

canvas.drawBitmap(// The first picture //);

The best would be if there was a way to copy an existing canvas and then you wont need to re-draw everything but I couldn't find one.