我在 ScrollView 上有一个绘制 View 。现在，当您不滚动并书写时，就没有问题了。一切看起来都很好。 但是，滚动后，您可以垂直绘制，但是一旦绘制，它就会将您的 Y 坐标设置为 ScrollView 的 Y 坐标(我认为)
我怀疑scrollevent正在覆盖onTouch事件。但我还不知道如何解决它。
例如
07-11 13:17:46.903 25508-25508/ V/﹕ Y - 8859.633
07-11 13:17:46.913 25508-25508/ V/﹕ Y - 8856.579
07-11 13:17:46.913 25508-25508/ V/﹕ Y - 8856.579
07-11 13:17:46.933 25508-25508/ V/﹕ Y - 8851.542
07-11 13:17:46.933 25508-25508/ V/﹕ Y - 8851.542
07-11 13:17:46.953 25508-25508/ V/﹕ Y - 8847.878
07-11 13:17:46.973 25508-25508/ V/﹕ Y - 544.6034 (as soon as I paint vertically up or down)
下面的图片说明了发生的情况。黄色荧光笔是我的笔/手指，蓝色是实际的绘图。
未向下滚动时
向下滚动时以及向上或向下绘制时
代码
public class MainActivity extends Activity {
DrawingView dv ;
private Paint mPaint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dv = new DrawingView(this);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(Color.GREEN);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
ScrollView mScrollView = new ScrollView(this);
mScrollView.addView(dv);
setContentView(mScrollView);
mScrollView.setOnTouchListener( new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent m)
{
if(m.getTouchMajor() == 0.0f) {
Log.v("xxxx","Scroll Touch Pen");
dv.onTouchEvent(m); <-- I know I am not passing the correct MotionEvent, but I have NO idea how to get the right one. At least this way I'm a "bit" closer to solving it as I can write horizontally as well without scrolling.
return true;
}
else
{
Log.v("xxxx","Scroll Touch Fingure");
return false;
}
}
});
}
还有我的DrawingView
public class DrawingView extends View {
public int width;
public int height;
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
Context context;
private Paint circlePaint;
private Path circlePath;
Rect clipBounds_canvas;
public DrawingView(Context c) {
super(c);
context=c;
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
circlePaint = new Paint();
circlePath = new Path();
circlePaint.setAntiAlias(true);
circlePaint.setColor(Color.BLUE);
circlePaint.setStyle(Paint.Style.STROKE);
circlePaint.setStrokeJoin(Paint.Join.MITER);
circlePaint.setStrokeWidth(4f);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
clipBounds_canvas = canvas.getClipBounds();
canvas.drawBitmap( mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath( mPath, mPaint);
canvas.drawPath( circlePath, circlePaint);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Compute the height required to render the view
// Assume Width will always be MATCH_PARENT.
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = 10000;
setMeasuredDimension(width, height);
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
// mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
Log.v("xxxx","Y - Start - " + y);
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
Log.v("xxxx","Y - Move - " + y);
circlePath.reset();
circlePath.addCircle(mX, mY, 30, Path.Direction.CW);
}
}
private void touch_up() {
mPath.lineTo(mX, mY);
circlePath.reset();
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
Log.v("xxxx","Y - " + y);
if(event.getTouchMajor() == 0.0f) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
// handleTouch(event);
// return true;
}
else
{
return false;
}
}
}
您是否能够看到我如何防止 ScrollView 覆盖我的运动事件(或者如果可能的话，至少有两个单独的事件。
最佳答案
找到了一个很好的解决方案here, that worked perfectly
就用这个方法
public static void disableTouchTheft(View view) {
view.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
view.getParent().requestDisallowInterceptTouchEvent(true);
switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_UP:
view.getParent().requestDisallowInterceptTouchEvent(false);
break;
}
return false;
}
});
}
关于android - ScrollView 事件覆盖 DrawView 事件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24699575/