在Android中的HorizontalScrollView中捏变焦无法正常工作
我在HorizontalScrollView中安排我的视图，我的每个视图（DrawView.java）都包含矩形。当活动仅包含此视图时，捏拉缩放功能正常工作（请参阅代码1和相应的图像1）但是当我在HorizontalScrollView中安排多个这些视图时，它无法正常工作，因为此视图的触摸事件是弄乱了HorizontalScrollView（代码2和图像2）的触摸事件。
有人请帮我解决这个问题。
这是捏缩放工作正常的活动代码。
public class MainActivity extends Activity {
DrawView drawView;
public class DrawView extends View {
Paint paint = new Paint();
public int recog=-1; // this variable will tell if onDraw is called for first time or is called by listener usinf invalidate()
boolean listener=false;
int data[] = new int[] {200,200,200,200,200,200,200,200,200,200,200,200};
private float MIN_ZOOM = 0.1f;
private float MAX_ZOOM = 10f;
private float mPosX;
private float mPosY;
boolean zoom=false;
private ScaleGestureDetector detector;
float width=200;
private float mLastTouchX;
private float mLastTouchY;
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
private static final int INVALID_POINTER_ID = -1;
// The ‘active pointer’ is the one currently moving our object.
private int mActivePointerId = INVALID_POINTER_ID;
public DrawView(Context context) {
this(context, null);
}
public DrawView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DrawView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
@Override
public void onDraw(Canvas canvas) {
paint.setColor(Color.GREEN);
canvas.save();
if(listener ==true)
mScaleFactor+=0.4;
Log.e("Ronak","Listener"+listener);
Log.e("Ronak","ScaleFactor"+mScaleFactor);
canvas.scale(mScaleFactor, 1);
canvas.drawRect(0.0f, 0.0f, 300.0f, 100.0f, paint);
makeLinesinRange(0,100,300,100,200, 5, canvas,100);
width=mScaleFactor*300;
canvas.restore();
requestLayout();
}
public boolean onTouchEvent(MotionEvent ev) {
// Let the ScaleGestureDetector inspect all events.
mScaleDetector.onTouchEvent(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
mLastTouchX = x;
mLastTouchY = y;
mActivePointerId = ev.getPointerId(0);
break;
}
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
// Only move if the ScaleGestureDetector isn't processing a gesture.
if (!mScaleDetector.isInProgress()) {
final float dx = x - mLastTouchX;
final float dy = y - mLastTouchY;
mPosX += dx;
mPosY += dy;
invalidate();
}
mLastTouchX = x;
mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastTouchX = ev.getX(newPointerIndex);
mLastTouchY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
}
break;
}
}
return true;
}
@Override protected void onMeasure(int widthMeasureSpec,
int heightMeasureSpec) {
// int width = MeasureSpec.getSize(widthMeasureSpec);
//int height = (int)(width * 0.5f);
setMeasuredDimension((int)width, 350);
}
private void makeLinesinRange(int x1, int y1, int x2, int y2, int size, int divisions, Canvas canvas,int width)
{
paint.setStrokeWidth(6);
paint.setColor(Color.DKGRAY);
float kk=(x2-x1)/(divisions-1);
for(int i=0;i<divisions;i++)
{
canvas.drawLine(x1+i*kk, y1, x1+i*kk, y2+size, paint);
}
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
Log.e("Ronak","scale "+mScaleFactor);
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.3f, Math.min(mScaleFactor, 5.0f));
invalidate();
return true;
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
drawView = new DrawView(this);
drawView.setBackgroundColor(Color.WHITE);
setContentView(drawView);
}
}
DrawView.java。这是单一视图的代码。我在HorizontalScrollView
中安排了多个这些视图public class DrawView extends View {
Paint paint = new Paint();
public int recog=-1; // this variable will tell if onDraw is called for first time or is called by listener usinf invalidate()
boolean listener=false;
int view_number=0;
int data[] = new int[] {200,200,200,200,200,200,200,200,200,200,200,200};
int lines[] = new int[] {4,5,7,8,2,6,6,3,2,1,1,6};
String[] type=new String[]{"Song","Music","Magazine","Audible","Videos","Apps","Other"};
private static float MIN_ZOOM = 0.1f;
private static float MAX_ZOOM = 10f;
private float mPosX;
private float mPosY;
boolean zoom=false;
private ScaleGestureDetector detector;
float width=700;
float height=500;
private float mLastTouchX;
private float mLastTouchY;
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
private static final int INVALID_POINTER_ID = -1;
// The ‘active pointer’ is the one currently moving our object.
private int mActivePointerId = INVALID_POINTER_ID;
public DrawView(Context context) {
this(context, null);
}
public DrawView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DrawView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
@Override
public void onDraw(Canvas canvas) {
paint.setColor(Color.BLUE);
canvas.save();
if(listener ==true)
mScaleFactor+=0.4;
Log.e("Ronak","Listener"+listener);
Log.e("Ronak","ScaleFactor"+mScaleFactor);
canvas.scale(mScaleFactor, 1);
canvas.drawRect(0.0f, 0.0f, 300.0f, 70.0f, paint);
makeLinesinRange(0,70,300,70,200, lines[view_number], canvas,100);
width=mScaleFactor*300;
height=mScaleFactor*100;
/*int start=0;
int temp=(int)width/lines[view_number];
for(int i=0;i<lines[view_number];i++)
{
canvas.drawText(type[i], 50, 100, paint);
start=temp;
temp+=temp;
}*/
canvas.restore();
requestLayout();
}
public boolean onTouchEvent(MotionEvent ev) {
// Let the ScaleGestureDetector inspect all events.
mScaleDetector.onTouchEvent(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
mLastTouchX = x;
mLastTouchY = y;
mActivePointerId = ev.getPointerId(0);
break;
}
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
// Only move if the ScaleGestureDetector isn't processing a gesture.
if (!mScaleDetector.isInProgress()) {
final float dx = x - mLastTouchX;
final float dy = y - mLastTouchY;
mPosX += dx;
mPosY += dy;
// invalidate();
}
mLastTouchX = x;
mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastTouchX = ev.getX(newPointerIndex);
mLastTouchY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
}
break;
}
}
return true;
}
public boolean onInterceptTouchEvent(MotionEvent event) {
/* switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
mIsBeingDragged = false;
break;
case MotionEvent.ACTION_MOVE:
float x = event.getX();
float y = event.getY();
float xDelta = Math.abs(x - mLastX);
float yDelta = Math.abs(y - mLastY);
float yDeltaTotal = y - mStartY;
if (yDelta > xDelta && Math.abs(yDeltaTotal) > mTouchSlop) {
mIsBeingDragged = true;
mStartY = y;
return true;
}
break;
}*/
Log.e("Ronak","Here");
return false;
}
@Override protected void onMeasure(int widthMeasureSpec,
int heightMeasureSpec) {
// int width = MeasureSpec.getSize(widthMeasureSpec);
//int height = (int)(width * 0.5f);
setMeasuredDimension((int)width, 350);
}
private void makeLinesinRange(int x1, int y1, int x2, int y2, int size, int total_events, Canvas canvas,int width)
{
paint.setStrokeWidth(6);
paint.setColor(Color.MAGENTA);
if(total_events<1)
{
return;
}
if(total_events==1)
{
canvas.drawLine(((x1+x2)/2), y1, (x1+x2)/2, y2+size, paint);
}
else if(total_events==2)
{
canvas.drawLine(((x1+x2)/3), y1, (x1+x2)/3, y2+size, paint);
canvas.drawLine((2*(x1+x2)/3), y1, 2*(x1+x2)/3, y2+size, paint);
}
else
{
paint.setStrokeWidth(6);
paint.setColor(Color.MAGENTA);
float kk=(x2-x1)/(total_events-1);
for(int i=0;i<total_events;i++)
{
canvas.drawLine(x1+i*kk, y1, x1+i*kk, y2+size, paint);
}
}
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
Log.e("Ronak","scale "+mScaleFactor);
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
invalidate();
return true;
}
}
}
我还有一个扩展HorizontalScrollView的类，并调用上面的类（DrawView.java）来在水平滚动中拟合多个这些视图。是否有蚂蚁需要覆盖此类的onTouch函数？
1 个答案:
答案 0 :(得分：1)
第一： YIKES！不要从onDraw（）调用requestLayout（） - 否则你将获得100％的负载，所有它将要做的就是重新布局并重绘自己。
第二步：从onInterceptTouchEvent()移除DrawView。由于它扩展View - 并且View没有这种方法 - 所以它不会被调用作为触摸调度过程的一部分。
第三：哪一个不起作用 - 滚动还是缩放？
阅读this thread，它对如何处理多个手势消耗组件有一些见解
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