使用 MotionEvent.ACTION_MOVE 制作像主屏幕一样的 ViewFlipper
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25-09-2019 - |
题
好的,我有一个 ViewFlipper
与三个 LinearLayouts
嵌套在其中。它默认显示第一个。这段代码:
// Assumptions in my Activity class:
// oldTouchValue is a float
// vf is my view flipper
@Override
public boolean onTouchEvent(MotionEvent touchEvent) {
switch (touchEvent.getAction()) {
case MotionEvent.ACTION_DOWN: {
oldTouchValue = touchEvent.getX();
break;
}
case MotionEvent.ACTION_UP: {
float currentX = touchEvent.getX();
if (oldTouchValue < currentX) {
vf.setInAnimation(AnimationHelper.inFromLeftAnimation());
vf.setOutAnimation(AnimationHelper.outToRightAnimation());
vf.showNext();
}
if (oldTouchValue > currentX) {
vf.setInAnimation(AnimationHelper.inFromRightAnimation());
vf.setOutAnimation(AnimationHelper.outToLeftAnimation());
vf.showPrevious();
}
break;
}
case MotionEvent.ACTION_MOVE: {
// TODO: Some code to make the ViewFlipper
// act like the home screen.
break;
}
}
return false;
}
public static class AnimationHelper {
public static Animation inFromRightAnimation() {
Animation inFromRight = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, +1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
inFromRight.setDuration(350);
inFromRight.setInterpolator(new AccelerateInterpolator());
return inFromRight;
}
public static Animation outToLeftAnimation() {
Animation outtoLeft = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
outtoLeft.setDuration(350);
outtoLeft.setInterpolator(new AccelerateInterpolator());
return outtoLeft;
}
// for the next movement
public static Animation inFromLeftAnimation() {
Animation inFromLeft = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
inFromLeft.setDuration(350);
inFromLeft.setInterpolator(new AccelerateInterpolator());
return inFromLeft;
}
public static Animation outToRightAnimation() {
Animation outtoRight = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, +1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
outtoRight.setDuration(350);
outtoRight.setInterpolator(new AccelerateInterpolator());
return outtoRight;
}
}
...处理视图翻转,但动画非常“开/关”。我想知道是否有人可以帮助我完成最后一部分。假设我可以访问 LinearLayouts,有没有办法可以根据 deltaX 和 deltaY 设置布局的位置?
有人给了我 这个链接 并说我应该参考 applyTransformation
方法以获取有关如何执行此操作的提示,但我不知道如何重复相同的行为。
解决方案
移动视图,当你移动你的手指是很容易做到:
case MotionEvent.ACTION_MOVE:
final View currentView = vf.getCurrentView();
currentView.layout((int)(touchEvent.getX() - oldTouchValue),
currentView.getTop(), currentView.getRight(),
currentView.getBottom());
break;
现在这仅移动当前视图,而不是邻居。我没有测试尚未,但那些大概可以通过getChildAt获得:
vf.getChildAt(vf.getDisplayedChild() - 1); // previous
vf.getChildAt(vf.getDisplayedChild() + 1); // next
希望有所帮助。
其他提示
如果我理解你的要求,现在应该使用 查看寻呼机
看起来像这样:
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