使喜欢使用MotionEvent.ACTION_MOVE主屏幕中ViewFlipper [英] Making a ViewFlipper like the Home Screen using MotionEvent.ACTION_MOVE

问题描述

好吧，我有一个 ViewFlipper 三 LinearLayouts 嵌套在它里面。它默认显示的第一个。这code：

Ok I have a ViewFlipper with three LinearLayouts nested inside it. It defaults to showing the first one. This code:

// 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是非常开/关。我不知道是否有人能帮助我的最后一部分。假设我可以访问LinearLayouts，是有办法，我可以设置基于DELTAX和移动deltaY布局的位置？

... handles the view flipping but the animations are very "on/off". I'm wondering if someone can help me out with the last part. Assuming that I can access the LinearLayouts, is there a way where I can set the position of the layouts based on deltaX and deltaY?

有人给了我此链接：<一href="https://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/view/animation/TranslateAnimation.java;h=d2ff754ac327dda0fe35e610752abb78904fbb66;hb=HEAD" rel="nofollow">https://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/view/animation/TranslateAnimation.java;h=d2ff754ac327dda0fe35e610752abb78904fbb66;hb=HEAD并说我应该指的是 applyTransformation 方法如何做到这一点的提示，但我不知道如何重复同样的行为。

Someone gave me this link: https://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/view/animation/TranslateAnimation.java;h=d2ff754ac327dda0fe35e610752abb78904fbb66;hb=HEAD and said I should refer to the applyTransformation method for hints on how to do this but I don't know how to repeat this same behavior.

推荐答案

移动视图你移动，而你的手指是很容易做到：

Moving the view while you're moving your finger is easily done:

case MotionEvent.ACTION_MOVE:
    final View currentView = vf.getCurrentView();
    currentView.layout((int)(touchEvent.getX() - oldTouchValue), 
            currentView.getTop(), currentView.getRight(), 
            currentView.getBottom());
break;

现在这只是移动目前看来，没有邻居。我没有测试还没有，但那些或许可以getChildAt获得：

Now this only moves the current view, not the neighbors. I didn't test that yet, but those can probably be obtained by getChildAt:

vf.getChildAt(vf.getDisplayedChild() - 1); // previous
vf.getChildAt(vf.getDisplayedChild() + 1); // next

希望有所帮助。

Hope that helps.

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