I had some problems with your code, so I made changes until I get a working version, here is my code if someone had problems with the question code:
Bitmap warp(Bitmap image, Point topLeft, Point topRight, Point bottomLeft, Point bottomRight) {
int resultWidth = (int)(topRight.x - topLeft.x);
int bottomWidth = (int)(bottomRight.x - bottomLeft.x);
if(bottomWidth > resultWidth)
resultWidth = bottomWidth;
int resultHeight = (int)(bottomLeft.y - topLeft.y);
int bottomHeight = (int)(bottomRight.y - topRight.y);
if(bottomHeight > resultHeight)
resultHeight = bottomHeight;
Mat inputMat = new Mat(image.getHeight(), image.getHeight(), CvType.CV_8UC1);
Utils.bitmapToMat(image, inputMat);
Mat outputMat = new Mat(resultWidth, resultHeight, CvType.CV_8UC1);
List<Point> source = new ArrayList<>();
source.add(topLeft);
source.add(topRight);
source.add(bottomLeft);
source.add(bottomRight);
Mat startM = Converters.vector_Point2f_to_Mat(source);
Point ocvPOut1 = new Point(0, 0);
Point ocvPOut2 = new Point(resultWidth, 0);
Point ocvPOut3 = new Point(0, resultHeight);
Point ocvPOut4 = new Point(resultWidth, resultHeight);
List<Point> dest = new ArrayList<>();
dest.add(ocvPOut1);
dest.add(ocvPOut2);
dest.add(ocvPOut3);
dest.add(ocvPOut4);
Mat endM = Converters.vector_Point2f_to_Mat(dest);
Mat perspectiveTransform = Imgproc.getPerspectiveTransform(startM, endM);
Imgproc.warpPerspective(inputMat, outputMat, perspectiveTransform, new Size(resultWidth, resultHeight));
Bitmap output = Bitmap.createBitmap(resultWidth, resultHeight, Bitmap.Config.ARGB_8888);
Utils.matToBitmap(outputMat, output);
return output;
}