我正在使用framelayout来保存我的每张卡片视图,并从中我开始每个动画动画(从左到右)。但我注意到这种运动并不是非常平滑。
我的代码如下,您建议做什么,以便提高卡片移动的整体平滑度。感谢
MyFrameLayout:
public class MyFrameLayout extends FrameLayout {
private static int mWidth = 500;
MyFrameLayout touchFrameLayout;
public MyFrameLayout(Context context) {
super(context);
initialize(context);
}
public MyFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
initialize(context);
}
public MyFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initialize(context);
}
private void initialize(Context context) {
setOnTouchListener(mTouchListener);
touchFrameLayout = this;
}
private float mDisplacementX;
// private float mLastMoveX;
private float mDisplacementY;
private float mInitialTx;
private boolean mTracking;
private OnTouchListener mTouchListener = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mWidth = (int) touchFrameLayout.getLayoutParams().width;
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mDisplacementX = event.getRawX();
mDisplacementY = event.getRawY();
mInitialTx = getTranslationX();
return true;
case MotionEvent.ACTION_MOVE:
// get the delta distance in X and Y direction
float deltaX = event.getRawX() - mDisplacementX;
float deltaY = event.getRawY() - mDisplacementY;
// updatePressedState(false);
// set the touch and cancel event
if ((Math.abs(deltaX) > ViewConfiguration.get(getContext())
.getScaledTouchSlop() * 2 && Math.abs(deltaY) < Math
.abs(deltaX) / 2)
|| mTracking) {
mTracking = true;
if (getTranslationX() <= mWidth / 2
&& getTranslationX() >= -(mWidth / 2)) {
setTranslationX(mInitialTx + deltaX);
return true;
}
}
break;
case MotionEvent.ACTION_UP:
if (mTracking) {
mTracking = false;
float currentTranslateX = getTranslationX();
if (currentTranslateX > (mWidth/10)) {
rightSwipe();
} else if (currentTranslateX < -(mWidth*10)) {
leftSwipe();
}
// comment this line if you don't want your frame layout to
// take its original position after releasing the touch
setTranslationX(0);
return true;
} else {
// handle click event
setTranslationX(0);
}
break;
}
return false;
}
};
private void deleteCard() {
...
}
private void rightSwipe() {
Toast.makeText(this.getContext(), "Swipe to the right",
Toast.LENGTH_SHORT).show();
DeleteCard();
}
private void leftSwipe() {
Toast.makeText(this.getContext(), "Swipe to the left",
Toast.LENGTH_SHORT).show();
DeleteCard();
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.example.testing.android.layout.MyFrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/taskViewContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
app:cardElevation="8dp"
app:cardPreventCornerOverlap="false"
card_view:cardCornerRadius="8dp">
......
</android.support.v7.widget.CardView>
</com.example.testing.android.layout.MyFrameLayout>
</RelativeLayout>
答案 0 :(得分:2)
为了让您的{4}}中的CardView更顺畅地移动,您将使用animation package为您的观看次数或其属性制作动画。有很多方法可以实现这一目标,但Property Animation是迄今为止最简单的方法。它确实符合您的需求,因为您提到您感兴趣的运动是FrameLayout
运动。您可以设置left to right
的动画,以便更顺畅地移动到CardView
。
仔细阅读this文档,以便按照您的意愿执行。
修改:可能LayoutTransition对您有用。查看this视频,看看它是什么。简而言之,当您在ViewGroup中添加/删除视图时,可以为所发生的过渡/尺寸标注设置动画。