实例介绍
android仿探探卡片滑动
public class TanTanCallback extends RenRenCallback {
private static final int MAX_ROTATION = 15;
//2016 12 26 考虑 探探垂直上下方向滑动，不删除卡片，
//判断 此次滑动方向是否是竖直的 ，水平方向上的误差(阈值，默认我给了50dp)
int mHorizontalDeviation;
public TanTanCallback(RecyclerView rv, RecyclerView.Adapter adapter, List datas) {
//this(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT, rv, adapter, datas);
super(rv, adapter, datas);
mHorizontalDeviation = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, mRv.getContext().getResources().getDisplayMetrics());
}
public TanTanCallback(int dragDirs, int swipeDirs, RecyclerView rv, RecyclerView.Adapter adapter, List datas) {
super(dragDirs, swipeDirs, rv, adapter, datas);
}
public int getHorizontalDeviation() {
return mHorizontalDeviation;
}
public TanTanCallback setHorizontalDeviation(int horizontalDeviation) {
mHorizontalDeviation = horizontalDeviation;
return this;
}
@Override
public float getSwipeThreshold(RecyclerView.ViewHolder viewHolder) {
/* Log.d("TAG", "getSwipeThreshold() called with: viewHolder.itemView.getX() = [" viewHolder.itemView.getX() "]");
Log.d("TAG", "getSwipeThreshold() called with: viewHolder.itemView.getWidth() / 2 = [" viewHolder.itemView.getWidth() / 2 "]");
Log.d("TAG", "getSwipeThreshold() called with: mRv.getX() = [" mRv.getX() "]");
Log.d("TAG", "getSwipeThreshold() called with: mRv.getWidth() / 2 = [" mRv.getWidth() / 2 "]");*/
if (isTopViewCenterInHorizontal(viewHolder.itemView)) {
return Float.MAX_VALUE;
}
return super.getSwipeThreshold(viewHolder);
}
@Override
public float getSwipeEscapeVelocity(float defaultValue) {
View topView = mRv.getChildAt(mRv.getChildCount() - 1);
if (isTopViewCenterInHorizontal(topView)) {
return Float.MAX_VALUE;
}
return super.getSwipeEscapeVelocity(defaultValue);
}
@Override
public float getSwipeVelocityThreshold(float defaultValue) {
View topView = mRv.getChildAt(mRv.getChildCount() - 1);
if (isTopViewCenterInHorizontal(topView)) {
return Float.MAX_VALUE;
}
return super.getSwipeVelocityThreshold(defaultValue);
}
/**
* 返回TopView此时在水平方向上是否是居中的
*
* @return
*/
public boolean isTopViewCenterInHorizontal(View topView) {
Log.d("TAG", "getSwipeThreshold() called with: viewHolder.itemView.getX() = [" topView.getX() "]");
Log.d("TAG", "getSwipeThreshold() called with: viewHolder.itemView.getWidth() / 2 = [" topView.getWidth() / 2 "]");
Log.d("TAG", "getSwipeThreshold() called with: mRv.getX() = [" mRv.getX() "]");
Log.d("TAG", "getSwipeThreshold() called with: mRv.getWidth() / 2 = [" mRv.getWidth() / 2 "]");
return Math.abs(mRv.getWidth() / 2 - topView.getX() - (topView.getWidth() / 2)) < mHorizontalDeviation;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
super.onSwiped(viewHolder, direction);
//如果不需要循环删除
/* Object remove = mDatas.remove(viewHolder.getLayoutPosition());
mAdapter.notifyDataSetChanged();*/
Log.e("swipecard", "厉害了");
/* if (isLeftSwipe){
Toast.makeText(mRv.getContext(), "左滑删除", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(mRv.getContext(), "右滑删除", Toast.LENGTH_SHORT).show();
}*/
//探探只是第一层加了rotate & alpha的操作
//对rotate进行复位
viewHolder.itemView.setRotation(0);
//自己感受一下吧 Alpha
if (viewHolder instanceof ViewHolder) {
ViewHolder holder = (ViewHolder) viewHolder;
holder.setAlpha(R.id.iv_love, 0);
holder.setAlpha(R.id.iv_del, 0);
}
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
Log.e("swipecard", "onChildDraw() viewHolder = [" viewHolder "], dX = [" dX "], dY = [" dY "], actionState = [" actionState "], isCurrentlyActive = [" isCurrentlyActive "]");
//探探的效果
double swipValue = Math.sqrt(dX * dX dY * dY);
double fraction = swipValue / getThreshold(viewHolder);
//边界修正 最大为1
if (fraction > 1) {
fraction = 1;
}
int childCount = recyclerView.getChildCount();
for (int i = 0; i < childCount; i ) {
View child = recyclerView.getChildAt(i);
//第几层,举例子，count =7， 最后一个TopView（6）是第0层，
int level = childCount - i - 1;
if (level > 0) {
child.setScaleX((float) (1 - SCALE_GAP * level fraction * SCALE_GAP));
if (level < MAX_SHOW_COUNT - 1) {
child.setScaleY((float) (1 - SCALE_GAP * level fraction * SCALE_GAP));
child.setTranslationY((float) (TRANS_Y_GAP * level - fraction * TRANS_Y_GAP));
} else {
//child.setTranslationY((float) (mTranslationYGap * (level - 1) - fraction * mTranslationYGap));
}
} else {
//探探只是第一层加了rotate & alpha的操作
//不过他区分左右
float xFraction = dX / getThreshold(viewHolder);
//边界修正 最大为1
if (xFraction > 1) {
xFraction = 1;
} else if (xFraction < -1) {
xFraction = -1;
}
//rotate
child.setRotation(xFraction * MAX_ROTATION);
//自己感受一下吧 Alpha
if (viewHolder instanceof ViewHolder) {
ViewHolder holder = (ViewHolder) viewHolder;
if (dX > 0) {
//露出左边，比心
holder.setAlpha(R.id.iv_love, xFraction);
} else if (dX < 0) {
//露出右边，滚犊子
holder.setAlpha(R.id.iv_del, -xFraction);
} else {
holder.setAlpha(R.id.iv_love, 0);
holder.setAlpha(R.id.iv_del, 0);
}
}
}
}
//可以在此判断左右滑：
float v = mRv.getWidth() / 2 - viewHolder.itemView.getX() - (viewHolder.itemView.getWidth() / 2);
if (v > 0) {
isLeftSwipe = true;
} else if (v < 0) {
isLeftSwipe = false;
}
}
//一个flag 判断左右滑
private boolean isLeftSwipe;
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
//Log.e("swipecard", "onChildDraw() viewHolder = [" viewHolder "], dX = [" dX "], dY = [" dY "], actionState = [" actionState "], isCurrentlyActive = [" isCurrentlyActive "]");
//人人影视的效果
//if (isCurrentlyActive) {
//先根据滑动的dxdy 算出现在动画的比例系数fraction
double swipValue = Math.sqrt(dX * dX dY * dY);
double fraction = swipValue / getThreshold(viewHolder);
//边界修正 最大为1
if (fraction > 1) {
fraction = 1;
}
//对每个ChildView进行缩放 位移
int childCount = recyclerView.getChildCount();
for (int i = 0; i < childCount; i ) {
View child = recyclerView.getChildAt(i);
//第几层,举例子，count =7， 最后一个TopView（6）是第0层，
int level = childCount - i - 1;
if (level > 0) {
child.setScaleX((float) (1 - SCALE_GAP * level fraction * SCALE_GAP));
if (level < MAX_SHOW_COUNT - 1) {
child.setScaleY((float) (1 - SCALE_GAP * level fraction * SCALE_GAP));
child.setTranslationY((float) (TRANS_Y_GAP * level - fraction * TRANS_Y_GAP));
} else {
//child.setTranslationY((float) (mTranslationYGap * (level - 1) - fraction * mTranslationYGap));
}
}
}
}
public class RenRenCallback extends ItemTouchHelper.SimpleCallback { protected RecyclerView mRv; protected List mDatas; protected RecyclerView.Adapter mAdapter; public RenRenCallback(RecyclerView rv, RecyclerView.Adapter adapter, List datas) { this(0, ItemTouchHelper.DOWN | ItemTouchHelper.UP | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT, rv, adapter, datas); } public RenRenCallback(int dragDirs, int swipeDirs , RecyclerView rv, RecyclerView.Adapter adapter, List datas) { super(dragDirs, swipeDirs); mRv = rv; mAdapter = adapter; mDatas = datas; } //水平方向是否可以被回收掉的阈值 public float getThreshold(RecyclerView.ViewHolder viewHolder) { //2016 12 26 考虑 探探垂直上下方向滑动，不删除卡片，这里参照源码写死0.5f return mRv.getWidth() * /*getSwipeThreshold(viewHolder)*/ 0.5f; } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { return false; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { //Log.e("swipecard", "onSwiped() called with: viewHolder = [" viewHolder "], direction = [" direction "]"); //rollBack(viewHolder); //★实现循环的要点 Object remove = mDatas.remove(viewHolder.getLayoutPosition()); mDatas.add(0, remove); mAdapter.notifyDataSetChanged(); } @Override public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); //Log.e("swipecard", "onChildDraw() viewHolder = [" viewHolder "], dX = [" dX "], dY = [" dY "], actionState = [" actionState "], isCurrentlyActive = [" isCurrentlyActive "]"); //人人影视的效果 //if (isCurrentlyActive) { //先根据滑动的dxdy 算出现在动画的比例系数fraction double swipValue = Math.sqrt(dX * dX dY * dY); double fraction = swipValue / getThreshold(viewHolder); //边界修正 最大为1 if (fraction > 1) {
fraction = 1; } //对每个ChildView进行缩放 位移 int childCount = recyclerView.getChildCount(); for (int i = 0; i < childCount; i ) {
View child = recyclerView.getChildAt(i); //第几层,举例子，count =7， 最后一个TopView（6）是第0层， int level = childCount - i - 1; if (level > 0) {
child.setScaleX((float) (1 - SCALE_GAP * level fraction * SCALE_GAP)); if (level < MAX_SHOW_COUNT - 1) {
child.setScaleY((float) (1 - SCALE_GAP * level fraction * SCALE_GAP)); child.setTranslationY((float) (TRANS_Y_GAP * level - fraction * TRANS_Y_GAP)); } else { //child.setTranslationY((float) (mTranslationYGap * (level - 1) - fraction * mTranslationYGap)); }
}
}
}
}
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