本文介绍了对多张图片拖动不工作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我工作的一个应用程序,它使用拖放放大器;滴上的图像,我可以添加在一个相对布局任何数目的图像。我能够拖动的图像,但仅一次。有一次,我添加新的图像,所有的previous图像不是动心了。
I am working on an app which uses drag & drop on Images I can add any number of images in a relative layout. I am able to drag images, but only one at a time. Once i add new image, all the previous images are not touchable.
public void addImage(Bitmap bmp)
{
ivtest= new ImageView(TabletActivity.this);
if(bmp!=null)
{
ivtest.setImageBitmap(bmp);
rlAddView.addView(ivtest, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
bmp= null;
}
ivtest.setTag("sdjfjd");
ivtest.bringToFront();
ivtest.setScaleType(ScaleType.MATRIX);
ivtest.setOnTouchListener(this);
}
这是code其中我添加一个新的形象。该ivtest是一个全球性ImageView的。
this is code where i add a new image. The ivtest is an global imageView.
public class TestImage extends View implements OnTouchListener
{
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
private Drawable mIcon;
private float mLastTouchX;
private static final int INVALID_POINTER_ID = -1;
// The ‘active pointer’ is the one currently moving our object.
private int mActivePointerId = INVALID_POINTER_ID;
private float mPosX;
private float mPosY;
private float mLastTouchY;
public TestImage(Context context, Drawable _micon)
{
super(context);
mIcon =_micon;
WindowManager wManager= (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
mIcon.setBounds((int)getPivotX(), (int)getPivotY(), mIcon.getIntrinsicWidth(),mIcon.getIntrinsicWidth());
// setOnTouchListener(this);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
@Override
public boolean onTouch(View view, MotionEvent ev)
{
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
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.translate(mPosX, mPosY);
canvas.scale(mScaleFactor, mScaleFactor);
mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(),mIcon.getIntrinsicWidth());
mIcon.draw(canvas);
canvas.restore();
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
invalidate();
return true;
}
}
}
}
推荐答案
我已经找到了答案。此保险业监督其执行拖放,旋转,缩放视图上库项目。 HTTP://$c$c.google.com/p/android-多点触控控制器/
i have found the answer. This ia a library project which implement the drag-drop, rotation, scaling on a view.http://code.google.com/p/android-multitouch-controller/
这篇关于对多张图片拖动不工作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!