In some of the application we draw image, text and line on Canvas object in Android. Canvas is the basic component in android for drawing objects on it.

#1 Create Canvas and display it in ImageView.
Now we create a Canvas and display its content in ImageView.

  public class MyCanvas extends View {
    public MyCanvas(Context context) {
      super(context);
      // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {
      // TODO Auto-generated method stub
      super.onDraw(canvas);
      Paint pBackground = new Paint();
      pBackground.setColor(Color.WHITE);
      canvas.drawRect(0, 0, 512, 512, pBackground);
      Paint pText = new Paint();
      pText.setColor(Color.BLACK);
      pText.setTextSize(20);
      canvas.drawText("Sample Text", 100, 100, pText);
    }
  }

Now set this canvas to your ImageView using following code.

  View v = new MyCanvas(getApplicationContext());
  Bitmap bitmap = Bitmap.createBitmap(500/*width*/, 500/*height*/, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  v.draw(canvas);
  ImageView iv = (ImageView) findViewById(R.id.iv);
  iv.setImageBitmap(bitmap);

You can see “Sample Text” in ImageView.

#2 Save canvas bitmap to sdcard.
We will save this bitmap to sdcard so all your drawing on canvas will be stored as image.

Bitmap b = null;

//create directory if not exist
File dir = new File("/sdcard/tempfolder/");
if (!dir.exists()) {
  dir.mkdirs();
}

File output = new File(dir, "tempfile.jpg");
OutputStream os = null;

try {
  os = new FileOutputStream(output);
  b.compress(Bitmap.CompressFormat.JPEG, 100, os);
  os.flush();
  os.close();

  //this code will scan the image so that it will appear in your gallery when you open next time
  MediaScannerConnection.scanFile(this,	new String[] { output.toString() }, null,
    new MediaScannerConnection.OnScanCompletedListener() {
      public void onScanCompleted(String path, Uri uri) {
        Log.d("appname", "image is saved in gallery and gallery is refreshed.");
      }
    }
  );
} catch (Exception e) {
}

If you find any problem or doubt, please mention in comments. Do not forget to share!

Download Source Code: https://github.com/dakshbhatt21/a-computer-engineer