当我最初选择红色并画一条线，然后选择蓝色并画一条线时，现在旧线也变为蓝色而不是红色，但是我希望红色保持红色，蓝色为这样可以帮助吗？
我也尝试在线获取此解决方案而不是解决我的问题。请帮助我。
DrawingView.java
public class DrawingView extends View {
Paint mPaint;
Path mpath;
Canvas mCanvas;
Bitmap myBitmap;
//initial color
private int paintColor = 0xFF660000;
private ArrayList<PathWithPaint> _graphics1 = new ArrayList<PathWithPaint>();
private ArrayList<Path> paths = new ArrayList<Path>();
private ArrayList<Path> undonePaths = new ArrayList<Path>();
// private Map<Path,Float> stoWid = new HashMap<Path,Float>();
private Map<Path, Integer> colorsMap = new HashMap<Path, Integer>();
public DrawingView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
Drawingsetup();
}
private void Drawingsetup() {
// TODO Auto-generated method stub
mPaint = new Paint();
mpath = new Path();
mCanvas = new Canvas();
mPaint.setDither(true);
mPaint.setColor(0xFFFFFFFF);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.BEVEL);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(3);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
// TODO Auto-generated method stub
super.onSizeChanged(w, h, oldw, oldh);
myBitmap = Bitmap.createBitmap(820, 480, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(myBitmap);
mCanvas.drawBitmap(myBitmap, 20, 20, mPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
//return super.onTouchEvent(event);
PathWithPaint pp = new PathWithPaint();
//mCanvas.drawPath(path, mPaint);
if (event.getAction() == MotionEvent.ACTION_DOWN) {
undonePaths.clear();
mpath.moveTo(event.getX(), event.getY());
mpath.lineTo(event.getX(), event.getY());
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
mpath.lineTo(event.getX(), event.getY());
pp.setPath(mpath);
pp.setmPaint(mPaint);
_graphics1.add(pp);
} else if (event.getAction()==MotionEvent.ACTION_UP) {
mpath.lineTo(event.getX(), event.getY());
// commit the path to our offscreen
mCanvas.drawPath(mpath, mPaint);
// kill this so we don't double draw
paths.add(mpath);
mpath = new Path();
colorsMap.put(mpath,paintColor); // store the color of mPath
}
invalidate();
return true;
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
//canvas.drawBitmap(myBitmap, 0, 0, mPaint);
for(Path p: paths){
canvas.drawPath(p, mPaint);
mPaint.setColor(colorsMap.get(p));
}
canvas.drawPath(mpath, mPaint);
canvas.setColor(paintColor);
}
public void CurrentDraw(){
}
public void StartNew(){
//colorsMap.clear();
undonePaths.clear();
paths.clear();
myBitmap.eraseColor(Color.TRANSPARENT);
mpath.reset();
invalidate();
_graphics1.clear();
}
public void ColorChanged(String newColor){
//set color
// start by invalidating the View
//parse and set the color for drawing
paintColor = Color.parseColor(newColor);
mPaint.setColor(paintColor);
invalidate();
}
public void onClickUndo()
{
if (paths.size()>0) {
undonePaths.add(paths.remove(paths.size()-1));
invalidate();
}
else
{
}
}
public void onClickRedo (){
if (undonePaths.size()>0) {
paths.add(undonePaths.remove(undonePaths.size()-1));
invalidate();
}
else
{
}
}
}
DrawingActivity.java
public class DrwaingActivity extends Activity {
DrawingView drawView;
Bitmap myBitmap;
private ImageButton currentpaint ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.draw_image);
//get drawing view
drawView = (DrawingView)findViewById(R.id.drawing);
// drawView.setOnClickListener(this);
//get the palette and first color button
LinearLayout paintLayout = (LinearLayout)findViewById(R.id.paint_colors);
currentpaint = (ImageButton)paintLayout.getChildAt(0);
currentpaint.setImageDrawable(getResources().getDrawable(R.drawable.paint));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_item, menu);
return true;
}
public void paintClicked(View view){
if(view!=currentpaint)
{
//update color
// retrieve the tag we set for each button in the layout, representing the chosen color
ImageButton imgView = (ImageButton)view;
String color = view.getTag().toString();
// call the new method on the custom drawing View object
drawView.ColorChanged(color);
// update the UI to reflect the new chosen paint and set the previous one back to normal
imgView.setImageDrawable(getResources().getDrawable(R.drawable.paint_pressed));
currentpaint.setImageDrawable(getResources().getDrawable(R.drawable.paint));
currentpaint=(ImageButton)view;
}
}