[//I am setting bitmap for editing but the problem is everything working great but when i open canvas again for edit the eraser convert erase part into black and does not work and I press save button then it whole screen convert into black.
public class DrawingView extends View{
// To hold the path that will be drawn.
private Path drawPath;
// Paint object to draw drawPath and drawCanvas.
public Paint drawPaint, canvasPaint;
// initial color
private int paintColor = 0xff000000;
private int previousColor = paintColor;
// canvas on which drawing takes place.
public Canvas drawCanvas;
// canvas bitmap
public Bitmap canvasBitmap;
// Brush stroke width
private float brushSize, lastBrushSize;
// To enable and disable erasing mode.
private boolean erase = false;
public DrawingView(Context context, AttributeSet attrs){
super(context, attrs);
setUpDrawing();
}
public void addBitmap(Bitmap bitmap){
canvasBitmap = bitmap;
// reset();
// drawPath.reset();
// drawPaint.setColor(Color.BLACK);
invalidate();
}
/**
* Initialize all objects required for drawing here.
* One time initialization reduces resource consumption.
*/
private void setUpDrawing(){
drawPath = new Path();
drawPaint = new Paint();
drawPaint.setColor(paintColor);
// Making drawing smooth.
drawPaint.setAntiAlias(true);
drawPaint.setStyle(Paint.Style.STROKE);
drawPaint.setStrokeJoin(Paint.Join.ROUND);
drawPaint.setStrokeCap(Paint.Cap.ROUND);
canvasPaint = new Paint(Paint.DITHER_FLAG);
// Initial brush size is medium.
brushSize = getResources().getInteger(R.integer.medium_size);
lastBrushSize = brushSize;
drawPaint.setStrokeWidth(brushSize);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (canvasBitmap == null){
canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
}
drawCanvas = new Canvas(canvasBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// canvas.drawColor(Color.WHITE);
canvas.drawBitmap(canvasBitmap, 0, 0, canvasPaint);
canvas.drawPath(drawPath, drawPaint);
// super.dispatchDraw(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// X and Y position of user touch.
float touchX = event.getX();
float touchY = event.getY();
// Draw the path according to the touch event taking place.
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
drawPath.moveTo(touchX, touchY);
break;
case MotionEvent.ACTION_MOVE:
drawPath.lineTo(touchX, touchY);
break;
case MotionEvent.ACTION_UP:
if (erase){
drawPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
drawPaint.setColor(Color.WHITE);
}
drawCanvas.drawPath(drawPath, drawPaint);
drawPath.reset();
drawPaint.setXfermode(null);
break;
default:
return false;
}
// invalidate the view so that canvas is redrawn.
invalidate();
return true;
}
public void setColor(String newColor){
// invalidate the view
invalidate();
paintColor = Color.parseColor(newColor);
drawPaint.setColor(paintColor);
previousColor = paintColor;
}
public void setBrushSize(float newSize){
float pixelAmount = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
newSize, getResources().getDisplayMetrics());
brushSize=pixelAmount;
drawPaint.setStrokeWidth(brushSize);
}
public void setLastBrushSize(float lastSize){
lastBrushSize=lastSize;
}
public float getLastBrushSize(){
return lastBrushSize;
}
public void setErase(boolean isErase){
//set erase true or false
erase = isErase;
if(erase) {
drawPaint.setColor(Color.WHITE);
//drawPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
}
else {
drawPaint.setColor(previousColor);
drawPaint.setXfermode(null);
}
}
public void startNew(){
drawCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
invalidate();
}
public void reset(){
drawPaint.reset();
drawPath.reset();
drawCanvas.drawColor(Color.WHITE);
invalidate();
setUpDrawing();
}
}
// in main activity
if (datadtlimgsItem != null && datadtlimgsItem.getImageStr() != null) {
decodedString = Base64.decode(datadtlimgsItem.getImageStr(), Base64.DEFAULT);
decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
decodedByte = Util.resize(decodedByte, 1500, 1500);
mDrawingView.addBitmap(decodedByte);
This image is showing the eraser in black color I have tried to remove that line but it is not erasing the specific area. I want to remove you can check in the details. I have tried to reset paths and set color on size changed and onDraw canvas but it is not working. Moreover when I click saved button I have set the method startNew() but when I come from edit screen, screen turns black after save otherwise everything working perfect. 我正在主要活动中动态设置位图，以编辑旧位图，第一次一切都运行良好，但是当我从下一个屏幕返回到上一个屏幕并设置动态位图橡皮擦时，将停止工作并在已擦除区域上设置黑色。
This image is showing the eraser in black color I have tried to remove that line but it is not erasing the specific area. I want to remove you can check in the details. I have tried to reset paths and set color on size changed and onDraw canvas but it is not working. Moreover when I click saved button I have set the method startNew() but when I come from edit screen, screen turns black after save otherwise everything working perfect.