package com.mcxtzhang.databindingdemo.recyclerview;
import android.app.Activity;
import android.graphics.PointF;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.OrientationHelper;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SnapHelper;
import android.view.View;
import com.mcxtzhang.databindingdemo.databinding.ActivityRecyclerViewBinding;
import com.mcxtzhang.databindingdemo.recyclerview.m.FirstBindingBean;
import com.mcxtzhang.databindingdemo.recyclerview.multype.MBean1;
import com.mcxtzhang.databindingdemo.recyclerview.multype.MBean2;
import com.mcxtzhang.zxtcommonlib.databinding.base.mul.BaseMulTypeBindingAdapter;
import java.util.ArrayList;
import java.util.List;
public class RecyclerViewActivity extends Activity {
private ActivityRecyclerViewBinding mBinding;
//private OldBaseBindingAdapter mAdapter;
private List<FirstBindingBean> mLists;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBinding = ActivityRecyclerViewBinding.inflate(getLayoutInflater());
setContentView(mBinding.getRoot());
initDatas();
mBinding.rv.setLayoutManager(new LinearLayoutManager(this));
/* mBinding.rv.setAdapter(mAdapter = new OldBaseBindingAdapter<ItemFirstRvBinding, FirstBindingBean>(this, R.layout.item_first_rv, mLists) {
@Override
public void onBindViewHolder(BaseBindingVH<ItemFirstRvBinding> holder, int position, ItemFirstRvBinding itemFirstRvBinding, final FirstBindingBean firstBindingBean) {
itemFirstRvBinding.setBean(firstBindingBean);
//普通的加载方法 但是当数据改变时 它不会立刻改变
Glide.with(RecyclerViewActivity.this).load(firstBindingBean.getUrl()).into(itemFirstRvBinding.normalLoadIv);
itemFirstRvBinding.getRoot().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(RecyclerViewActivity.this, "改变name", Toast.LENGTH_SHORT).show();
firstBindingBean.setName(firstBindingBean.getName() + "改变");
firstBindingBean.setUrl("https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png");
}
});
firstBindingBean.addOnPropertyChangedCallback(new Observable.OnPropertyChangedCallback() {
@Override
public void onPropertyChanged(Observable sender, int propertyId) {
switch (propertyId) {
case BR.name:
Toast.makeText(RecyclerViewActivity.this, "name propertyId:" + propertyId, Toast.LENGTH_SHORT).show();
break;
case BR.url:
break;
}
}
});
itemFirstRvBinding.addOnRebindCallback(new OnRebindCallback() {
@Override
public boolean onPreBind(ViewDataBinding binding) {
ViewGroup sceneRoot = (ViewGroup) binding.getRoot();
TransitionManager.beginDelayedTransition(sceneRoot);
return true;
}
});
}
});*/
//就一种Item：新写法 代码更少了，但是总觉得有种约束感 ：
/* mBinding.rv.setAdapter(new BaseBindingAdapter<FirstBindingBean, ItemMulType1Binding>(this, R.layout.item_mul_type_1, mLists) {
@Override
public void onBindViewHolder(final BaseBindingVH holder, final int position) {
super.onBindViewHolder(holder, position);
holder.getBinding().getRoot().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mLists.get(position).setName("变变变");
ViewDataBinding binding = holder.getBinding();
}
});
}
});*/
//2016 10 30 封装两个泛型
/* mBinding.rv.setAdapter(new BaseBindingAdapter<FirstBindingBean, ItemMulType1Binding>(this, R.layout.item_mul_type_1, mLists) {
@Override
public void onBindViewHolder(BaseBindingVH<ItemMulType1Binding> holder, int position) {
super.onBindViewHolder(holder, position);
final ItemMulType1Binding binding = holder.getBinding();
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
binding.tv.setText("只是试一试 不要这么写");
}
});
}
});*/
//普通多种item(未封装)
//mBinding.rv.setAdapter( new MulTypeAdapter(this, mLists));
//Base多种Item
/* mBinding.rv.setAdapter(new BaseMulTypeBindingAdapter(this, mLists) {
@Override
public void onBindViewHolder(final BaseBindingVH holder, final int position) {
super.onBindViewHolder(holder, position);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
switch (getItemViewType(position)) {
case R.layout.item_mul_type_1:
ItemMulType1Binding binding = (ItemMulType1Binding) holder.getBinding();
binding.tv.setText(binding.tv.getText() + "追加");
break;
}
}
});
}
});*/
//Base 多种Item，连bean都可以不一样，你觉得屌不屌
mBinding.rv.setAdapter(new BaseMulTypeBindingAdapter(this, initMulTypeDatas()));
//google也太抠门了 ， 方法都写成private protected 让我没办法用。QAQ 只能自己参照源码写
new SnapHelper() {
private static final float INVALID_DISTANCE = 1f;
// Orientation helpers are lazily created per LayoutManager.
@Nullable
private OrientationHelper mVerticalHelper;
@Nullable
private OrientationHelper mHorizontalHelper;
//最近的View距离目标的距离
@Nullable
@Override
public int[] calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager, @NonNull View targetView) {
int[] out = new int[2];
if (layoutManager.canScrollHorizontally()) {
out[0] = distanceToEnd(layoutManager, targetView,
getHorizontalHelper(layoutManager));
} else {
out[0] = 0;
}
if (layoutManager.canScrollVertically()) {
out[1] = distanceToEnd(layoutManager, targetView,
getVerticalHelper(layoutManager));
} else {
out[1] = 0;
}
return out;
}
private int distanceToEnd(RecyclerView.LayoutManager layoutManager,
View targetView, OrientationHelper helper) {
final int end;
if (layoutManager.getClipToPadding()) {
end = helper.getStartAfterPadding() + helper.getTotalSpace();
} else {
end = helper.getEnd();
}
return helper.getDecoratedEnd(targetView) - end;
}
//获取离我们目标最近的View
@Nullable
@Override
public View findSnapView(RecyclerView.LayoutManager layoutManager) {
if (layoutManager.canScrollVertically()) {
return findEndView(layoutManager, getVerticalHelper(layoutManager));
} else if (layoutManager.canScrollHorizontally()) {
return findEndView(layoutManager, getHorizontalHelper(layoutManager));
}
return null;
}
private View findEndView(RecyclerView.LayoutManager layoutManager, OrientationHelper helper) {
int childCount = layoutManager.getChildCount();
if (childCount == 0) {
return null;
}
View endChild = null;
final int end;
if (layoutManager.getClipToPadding()) {
end = helper.getStartAfterPadding() + helper.getTotalSpace();
} else {
end = helper.getEnd();
}
int absClosest = Integer.MAX_VALUE;
//遍历取出底边离end最近的。
for (int i = 0; i < childCount; i++) {
final View child = layoutManager.getChildAt(i);
int childEnd = helper.getDecoratedEnd(child);
int absDistance = Math.abs(childEnd - end);
// 谁的底边离end最近，就是移动谁
if (absDistance < absClosest) {
absClosest = absDistance;
endChild = child;
}
}
return endChild;
}
//要滑动到的目标position
@Override
public int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int velocityX, int velocityY) {
if (!(layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider)) {
return RecyclerView.NO_POSITION;
}
final int itemCount = layoutManager.getItemCount();
if (itemCount == 0) {
return RecyclerView.NO_POSITION;
}
final View currentView = findSnapView(layoutManager);
if (currentView == null) {
return RecyclerView.NO_POSITION;
}
final int currentPosition = layoutManager.getPosition(currentView);
if (currentPosition == RecyclerView.NO_POSITION) {
return RecyclerView.NO_POSITION;
}
RecyclerView.SmoothScroller.ScrollVectorProvider vectorProvider =
(RecyclerView.SmoothScroller.ScrollVectorProvider) layoutManager;
// deltaJumps sign comes from the velocity which may not match the order of children in
// the LayoutManager. To overcome this, we ask for a vector from the LayoutManager to
// get the direction.
PointF vectorForEnd = vectorProvider.computeScrollVectorForPosition(itemCount - 1);
if (vectorForEnd == null) {
// cannot get a vector for the given position.
return RecyclerView.NO_POSITION;
}
int vDeltaJump, hDeltaJump;
if (layoutManager.canScrollHorizontally()) {
hDeltaJump = estimateNextPositionDiffForFling(layoutManager,
getHorizontalHelper(layoutManager), velocityX, 0);
if (vectorForEnd.x < 0) {
hDeltaJump = -hDeltaJump;
}
} else {
hDeltaJump = 0;
}
if (layoutManager.canScrollVertically()) {
vDeltaJump = estimateNextPositionDiffForFling(layoutManager,
getVerticalHelper(layoutManager), 0, velocityY);
if (vectorForEnd.y < 0) {
vDeltaJump = -vDeltaJump;
}
} else {
vDeltaJump = 0;
}
int deltaJump = layoutManager.canScrollVertically() ? vDeltaJump : hDeltaJump;
if (deltaJump == 0) {
return RecyclerView.NO_POSITION;
}
int targetPos = currentPosition + deltaJump;
if (targetPos < 0) {
targetPos = 0;
}
if (targetPos >= itemCount) {
targetPos = itemCount - 1;
}
return targetPos;
}
private int estimateNextPositionDiffForFling(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper, int velocityX, int velocityY) {
int[] distances = calculateScrollDistance(velocityX, velocityY);
float distancePerChild = computeDistancePerChild(layoutManager, helper);
if (distancePerChild <= 0) {
return 0;
}
int distance =
Math.abs(distances[0]) > Math.abs(distances[1]) ? distances[0] : distances[1];
return (int) Math.floor(distance / distancePerChild);
}
private float computeDistancePerChild(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper) {
View minPosView = null;
View maxPosView = null;
int minPos = Integer.MAX_VALUE;
int maxPos = Integer.MIN_VALUE;
int childCount = layoutManager.getChildCount();
if (childCount == 0) {
return INVALID_DISTANCE;
}
for (int i = 0; i < childCount; i++) {
View child = layoutManager.getChildAt(i);
final int pos = layoutManager.getPosition(child);
if (pos == RecyclerView.NO_POSITION) {
continue;
}
if (pos < minPos) {
minPos = pos;
minPosView = child;
}
if (pos > maxPos) {
maxPos = pos;
maxPosView = child;
}
}
if (minPosView == null || maxPosView == null) {
return INVALID_DISTANCE;
}
int start = Math.min(helper.getDecoratedStart(minPosView),
helper.getDecoratedStart(maxPosView));
int end = Math.max(helper.getDecoratedEnd(minPosView),
helper.getDecoratedEnd(maxPosView));
int distance = end - start;
if (distance == 0) {
return INVALID_DISTANCE;
}
return 1f * distance / ((maxPos - minPos) + 1);
}
@NonNull
private OrientationHelper getVerticalHelper(@NonNull RecyclerView.LayoutManager layoutManager) {
if (mVerticalHelper == null) {
mVerticalHelper = OrientationHelper.createVerticalHelper(layoutManager);
}
return mVerticalHelper;
}
@NonNull
private OrientationHelper getHorizontalHelper(
@NonNull RecyclerView.LayoutManager layoutManager) {
if (mHorizontalHelper == null) {
mHorizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager);
}
return mHorizontalHelper;
}
}.attachToRecyclerView(mBinding.rv);
mBinding.setPresenter(new FirstPresenter());
}
public List initMulTypeDatas() {
List mulTypeDatas = new ArrayList<>();
mulTypeDatas.add(new MBean1("http://imgs.ebrun.com/resources/2016_03/2016_03_25/201603259771458878793312_origin.jpg", "张"));
mulTypeDatas.add(new MBean1("http://p14.go007.com/2014_11_02_05/a03541088cce31b8_1.jpg", "旭童"));
mulTypeDatas.add(new MBean2("http://news.k618.cn/tech/201604/W020160407281077548026.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://www.kejik.com/image/1460343965520.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://cn.chinadaily.com.cn/img/attachement/jpg/site1/20160318/eca86bd77be61855f1b81c.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://imgs.ebrun.com/resources/2016_04/2016_04_12/201604124411460430531500.jpg", "多种type"));
mulTypeDatas.add(new MBean1("http://imgs.ebrun.com/resources/2016_04/2016_04_24/201604244971461460826484_origin.jpeg", "多种type"));
mulTypeDatas.add(new MBean1("http://www.lnmoto.cn/bbs/data/attachment/forum/201408/12/074018gshshia3is1cw3sg.jpg", "多种type"));
mulTypeDatas.add(new MBean1("http://p14.go007.com/2014_11_02_05/a03541088cce31b8_1.jpg", "旭童"));
mulTypeDatas.add(new MBean2("http://news.k618.cn/tech/201604/W020160407281077548026.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://www.kejik.com/image/1460343965520.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://cn.chinadaily.com.cn/img/attachement/jpg/site1/20160318/eca86bd77be61855f1b81c.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://imgs.ebrun.com/resources/2016_04/2016_04_12/201604124411460430531500.jpg", "多种type"));
mulTypeDatas.add(new MBean1("http://imgs.ebrun.com/resources/2016_04/2016_04_24/201604244971461460826484_origin.jpeg", "多种type"));
mulTypeDatas.add(new MBean1("http://www.lnmoto.cn/bbs/data/attachment/forum/201408/12/074018gshshia3is1cw3sg.jpg", "多种type"));
mulTypeDatas.add(new MBean1("http://p14.go007.com/2014_11_02_05/a03541088cce31b8_1.jpg", "旭童"));
mulTypeDatas.add(new MBean2("http://news.k618.cn/tech/201604/W020160407281077548026.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://www.kejik.com/image/1460343965520.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://cn.chinadaily.com.cn/img/attachement/jpg/site1/20160318/eca86bd77be61855f1b81c.jpg", "多种type"));
mulTypeDatas.add(new MBean2("http://imgs.ebrun.com/resources/2016_04/2016_04_12/201604124411460430531500.jpg", "多种type"));
mulTypeDatas.add(new MBean1("http://imgs.ebrun.com/resources/2016_04/2016_04_24/201604244971461460826484_origin.jpeg", "多种type"));
mulTypeDatas.add(new MBean1("http://www.lnmoto.cn/bbs/data/attachment/forum/201408/12/074018gshshia3is1cw3sg.jpg", "多种type"));
return mulTypeDatas;
}
private void initDatas() {
mLists = new ArrayList<>();
ArrayList<FirstBindingBean> nestBeen = new ArrayList<>();
mLists.add(new FirstBindingBean("http://imgs.ebrun.com/resources/2016_03/2016_03_25/201603259771458878793312_origin.jpg", "张", 1));
mLists.add(new FirstBindingBean("http://p14.go007.com/2014_11_02_05/a03541088cce31b8_1.jpg", "旭童", 2));
mLists.add(new FirstBindingBean("http://news.k618.cn/tech/201604/W020160407281077548026.jpg", 3));
mLists.add(new FirstBindingBean("http://www.kejik.com/image/1460343965520.jpg", 1));
mLists.add(new FirstBindingBean("http://cn.chinadaily.com.cn/img/attachement/jpg/site1/20160318/eca86bd77be61855f1b81c.jpg", 2));
mLists.add(new FirstBindingBean("http://imgs.ebrun.com/resources/2016_04/2016_04_12/201604124411460430531500.jpg", 3));
mLists.add(new FirstBindingBean("http://imgs.ebrun.com/resources/2016_04/2016_04_24/201604244971461460826484_origin.jpeg", 1));
mLists.add(new FirstBindingBean("http://www.lnmoto.cn/bbs/data/attachment/forum/201408/12/074018gshshia3is1cw3sg.jpg", 2));
}
public class FirstPresenter {
public void onAddClick() {
mLists.add(new FirstBindingBean("http://finance.gucheng.com/UploadFiles_7830/201603/2016032110220685.jpg", "add"));
//mAdapter.notifyItemInserted(mLists.size());
}
public void onDelClick() {
mLists.remove(mLists.size() - 1);
//mAdapter.notifyItemRemoved(mLists.size());
}
}
}