Android 仿今日头条、网易新闻的频道管理

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="soexample.umeng.com.myapplication.MainActivity"
android:orientation="vertical"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recy"
android:padding="8dp"
android:clipChildren="false"
android:clipToPadding="false"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</FrameLayout>
</LinearLayout>

/**
*   频道 增删改查 排序
*/
public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showDialog();
}

private RecyclerView mRecy;
private ChannelAdapter adapter;
private Dialog dialog;//对话框
public void showDialog() {
if (dialog == null) {
dialog = new Dialog(MainActivity.this, R.style.custom_dialog);
dialog.setCanceledOnTouchOutside(true);
//获取对话框的窗口，并设置窗口参数
Window win = dialog.getWindow();
WindowManager.LayoutParams params = new WindowManager.LayoutParams();
// 不能写成这样,否则Dialog显示不出来
// LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
//对话框窗口的宽和高
params.width = WindowManager.LayoutParams.MATCH_PARENT;
params.height = WindowManager.LayoutParams.MATCH_PARENT;
//对话框窗口显示的位置
params.x = 120;
params.y = 590;
win.setAttributes(params);
//设置对话框布局
dialog.setContentView(R.layout.activity_channel);
mRecy = (RecyclerView)dialog.findViewById(R.id.recy);
final List<ChannelEntity> items = new ArrayList<>();
for (int i = 0; i < 18; i++) {
ChannelEntity entity = new ChannelEntity();
entity.setName("频道" + i);
items.add(entity);
}
final List<ChannelEntity> otherItems = new ArrayList<>();
for (int i = 0; i < 20; i++) {
ChannelEntity entity = new ChannelEntity();
entity.setName("其他" + i);
otherItems.add(entity);
}
GridLayoutManager manager = new GridLayoutManager(this, 4);
mRecy.setLayoutManager(manager);
ItemDragHelperCallback callback = new ItemDragHelperCallback();
final ItemTouchHelper helper = new ItemTouchHelper(callback);
helper.attachToRecyclerView(mRecy);
adapter = new ChannelAdapter(MainActivity.this, helper, items, otherItems,dialog);
manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
int viewType = adapter.getItemViewType(position);
return viewType == ChannelAdapter.TYPE_MY || viewType == ChannelAdapter.TYPE_OTHER ? 1 : 4;

}
});
mRecy.setAdapter(adapter);
adapter.setOnMyChannelItemClickListener(new ChannelAdapter.OnMyChannelItemClickListener() {
@Override
public void onItemClick(View v, int position) {
Toast.makeText(MainActivity.this, items.get(position).getName(), Toast.LENGTH_SHORT).show();
}
});

}
dialog.show();
}

/**
* 隐藏对话框
*/
public void dismiss() {
//隐藏对话框之前先判断对话框是否存在，以及是否正在显示
if (dialog != null && dialog.isShowing()) {
dialog.dismiss();
}
}
}

/**
* 拖拽排序 + 增删
*
*/
public class ChannelAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements OnItemMoveListener {
// 我的频道 标题部分
public static final int TYPE_MY_CHANNEL_HEADER = 0;
// 我的频道
public static final int TYPE_MY = 1;
// 其他频道 标题部分
public static final int TYPE_OTHER_CHANNEL_HEADER = 2;
// 其他频道
public static final int TYPE_OTHER = 3;

// 我的频道之前的header数量  该demo中 即标题部分 为 1
private static final int COUNT_PRE_MY_HEADER = 1;
// 其他频道之前的header数量  该demo中 即标题部分 为 COUNT_PRE_MY_HEADER + 1
private static final int COUNT_PRE_OTHER_HEADER = COUNT_PRE_MY_HEADER + 1;

private static final long ANIM_TIME = 360L;

// touch 点击开始时间
private long startTime;
// touch 间隔时间  用于分辨是否是 "点击"
private static final long SPACE_TIME = 100;

private LayoutInflater mInflater;
private ItemTouchHelper mItemTouchHelper;

// 是否为 编辑 模式
private boolean isEditMode;

private List<ChannelEntity> mMyChannelItems, mOtherChannelItems;

// 我的频道点击事件
private OnMyChannelItemClickListener mChannelItemClickListener;

private  OnMyChannelItemC mChannelItemC  ;

private Dialog dialog;//对话框

private boolean flag=false;

private Context context;

public ChannelAdapter(Context context, ItemTouchHelper helper, List<ChannelEntity> mMyChannelItems, List<ChannelEntity> mOtherChannelItems,Dialog dialog) {
this.mInflater = LayoutInflater.from(context);
this.mItemTouchHelper = helper;
this.mMyChannelItems = mMyChannelItems;
this.mOtherChannelItems = mOtherChannelItems;
this.dialog=dialog;
this.context=context;
}

@Override
public int getItemViewType(int position) {
if (position == 0) {    // 我的频道 标题部分
return TYPE_MY_CHANNEL_HEADER;
} else if (position == mMyChannelItems.size() + 1) {    // 其他频道 标题部分
return TYPE_OTHER_CHANNEL_HEADER;
} else if (position > 0 && position < mMyChannelItems.size() + 1) {
return TYPE_MY;
} else {
return TYPE_OTHER;
}
}

/**
* 获取频道列表  已选的
*/
public List<ChannelEntity> getChannnelLst() {
return mMyChannelItems;
}

/**
* 获取频道列表  未选的
*/
public List<ChannelEntity> getChannnelLstother() {
return mOtherChannelItems;
}

View view;
@Override
public RecyclerView.ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {

switch (viewType) {
case TYPE_MY_CHANNEL_HEADER: // 我的频道 标题部分
view = mInflater.inflate(R.layout.item_my_channel_header, parent, false);
final MyChannelHeaderViewHolder holder = new MyChannelHeaderViewHolder(view);
holder.tvBtnEdit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!isEditMode) {
startEditMode((RecyclerView) parent);
holder.tvBtnEdit.setText(R.string.finish);
} else {
cancelEditMode((RecyclerView) parent);
holder.tvBtnEdit.setText(R.string.edit);
}
}
});

holder.llback.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//隐藏对话框之前先判断对话框是否存在，以及是否正在显示
if (dialog != null && dialog.isShowing()) {
dialog.dismiss();
/**
*   如果没有点击完成，默认切换
*/
cancelEditMode((RecyclerView) parent);
holder.tvBtnEdit.setText(R.string.edit);

}
}
});

return holder;

//我的频道
case TYPE_MY:
view = mInflater.inflate(R.layout.item_my, parent, false);
final MyViewHolder myHolder = new MyViewHolder(view);

myHolder.textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
int position = myHolder.getAdapterPosition();
// 是否为 编辑 模式
if (isEditMode) {
//是否需要保存
flag = true;
RecyclerView recyclerView = ((RecyclerView) parent);
View targetView = recyclerView.getLayoutManager().findViewByPosition(mMyChannelItems.size() + COUNT_PRE_OTHER_HEADER);
View currentView = recyclerView.getLayoutManager().findViewByPosition(position);
// 如果targetView不在屏幕内,则indexOfChild为-1  此时不需要添加动画,因为此时notifyItemMoved自带一个向目标移动的动画
// 如果在屏幕内,则添加一个位移动画
if (recyclerView.indexOfChild(targetView) >= 0) {
int targetX, targetY;

RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
int spanCount = ((GridLayoutManager) manager).getSpanCount();

// 移动后 高度将变化 (我的频道Grid 最后一个item在新的一行第一个)
if ((mMyChannelItems.size() - COUNT_PRE_MY_HEADER) % spanCount == 0) {
View preTargetView = recyclerView.getLayoutManager().findViewByPosition(mMyChannelItems.size() + COUNT_PRE_OTHER_HEADER - 1);
targetX = preTargetView.getLeft();
targetY = preTargetView.getTop();
} else {
targetX = targetView.getLeft();
targetY = targetView.getTop();
}

/**
*
*   动画加到下面的方法里
*/
moveMyToOther(myHolder, recyclerView, currentView, targetX, targetY);

//                                startAnimation(recyclerView, currentView, targetX, targetY);
Log.e(" 已选   1", "/*/*/*******************************");
} else {
Log.e(" 已选   2", "/*/*/*******************************");
moveMyToOther(myHolder, recyclerView, currentView, 0, 0);
}
//
//                            mChannelItemC.onItemClick(v, position - COUNT_PRE_MY_HEADER, flag);
} else {
//// 我的频道之前的header数量  该demo中 即标题部分 为 1   COUNT_PRE_MY_HEADER
mChannelItemClickListener.onItemClick(v, position - COUNT_PRE_MY_HEADER);
}
}
});

/**
*    长按*******************
*/

myHolder.textView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(final View v) {

if (!isEditMode) {
RecyclerView recyclerView = ((RecyclerView) parent);
startEditMode(recyclerView);

// header 按钮文字 改成 "完成"
View view = recyclerView.getChildAt(0);
if (view == recyclerView.getLayoutManager().findViewByPosition(0)) {
TextView tvBtnEdit = (TextView) view.findViewById(R.id.tv_btn_edit);
tvBtnEdit.setText(R.string.finish);
}
} else
//是否需要保存
flag = true;
int position = myHolder.getAdapterPosition();
/**
* 处理第一个和第二个不可以拖动
*/
if (position != 1 && position != 2) {
mItemTouchHelper.startDrag(myHolder);
}
//                            mChannelItemC.onItemClick(v, position - COUNT_PRE_MY_HEADER, flag);
return true;
}
});

myHolder.textView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int position = myHolder.getAdapterPosition();
if (isEditMode) {
switch (MotionEventCompat.getActionMasked(event)) {
case MotionEvent.ACTION_DOWN:
startTime = System.currentTimeMillis();
break;
case MotionEvent.ACTION_MOVE:

if (System.currentTimeMillis() - startTime > SPACE_TIME) {
/**
* 处理第一个和第二个不可以拖动
*/
if (position!=1&&position!=2){
mItemTouchHelper.startDrag(myHolder);
}

}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:

startTime = 0;
break;
}

}
return false;
}
});

return myHolder;

//// 其他频道 标题部分
case TYPE_OTHER_CHANNEL_HEADER:

view = mInflater.inflate(R.layout.item_other_channel_header, parent, false);

return new RecyclerView.ViewHolder(view) {
};

// // 其他频道
case TYPE_OTHER:
view = mInflater.inflate(R.layout.item_other, parent, false);
final OtherViewHolder otherHolder = new OtherViewHolder(view);

otherHolder.textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//是否需要保存
flag=true;
RecyclerView recyclerView = ((RecyclerView) parent);
RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
int currentPiosition = otherHolder.getAdapterPosition();
// 如果RecyclerView滑动到底部,移动的目标位置的y轴 - height
View currentView = manager.findViewByPosition(currentPiosition);
// 目标位置的前一个item  即当前MyChannel的最后一个
View preTargetView = manager.findViewByPosition(mMyChannelItems.size() - 1 + COUNT_PRE_MY_HEADER);

// 如果targetView不在屏幕内,则为-1  此时不需要添加动画,因为此时notifyItemMoved自带一个向目标移动的动画
// 如果在屏幕内,则添加一个位移动画
if (recyclerView.indexOfChild(preTargetView) >= 0) {
int targetX = preTargetView.getLeft();
int targetY = preTargetView.getTop();

int targetPosition = mMyChannelItems.size() - 1 + COUNT_PRE_OTHER_HEADER;

GridLayoutManager gridLayoutManager = ((GridLayoutManager) manager);
int spanCount = gridLayoutManager.getSpanCount();
// target 在最后一行第一个
if ((targetPosition - COUNT_PRE_MY_HEADER) % spanCount == 0) {
View targetView = manager.findViewByPosition(targetPosition);
targetX = targetView.getLeft();
targetY = targetView.getTop();
} else {
targetX += preTargetView.getWidth();

// 最后一个item可见
if (gridLayoutManager.findLastVisibleItemPosition() == getItemCount() - 1) {
// 最后的item在最后一行第一个位置
if ((getItemCount() - 1 - mMyChannelItems.size() - COUNT_PRE_OTHER_HEADER) % spanCount == 0) {
// RecyclerView实际高度 > 屏幕高度 && RecyclerView实际高度 < 屏幕高度 + item.height
int firstVisiblePostion = gridLayoutManager.findFirstVisibleItemPosition();
if (firstVisiblePostion == 0) {
// FirstCompletelyVisibleItemPosition == 0 即 内容不满一屏幕 , targetY值不需要变化
// // FirstCompletelyVisibleItemPosition != 0 即 内容满一屏幕 并且 可滑动 , targetY值 + firstItem.getTop
if (gridLayoutManager.findFirstCompletelyVisibleItemPosition() != 0) {
int offset = (-recyclerView.getChildAt(0).getTop()) - recyclerView.getPaddingTop();
targetY += offset;
}
} else { // 在这种情况下 并且 RecyclerView高度变化时(即可见第一个item的 position != 0),
// 移动后, targetY值  + 一个item的高度
targetY += preTargetView.getHeight();
}
}
} else {
System.out.println("current--No");
}
}

// 如果当前位置是otherChannel可见的最后一个
// 并且 当前位置不在grid的第一个位置
// 并且 目标位置不在grid的第一个位置

// 则 需要延迟250秒 notifyItemMove , 这是因为这种情况 , 并不触发ItemAnimator , 会直接刷新界面
// 导致我们的位移动画刚开始,就已经notify完毕,引起不同步问题
if (currentPiosition == gridLayoutManager.findLastVisibleItemPosition()
&& (currentPiosition - mMyChannelItems.size() - COUNT_PRE_OTHER_HEADER) % spanCount != 0
&& (targetPosition - COUNT_PRE_MY_HEADER) % spanCount != 0) {
moveOtherToMyWithDelay(otherHolder);

Log.e("1","/*/*/*******************************");
} else {
moveOtherToMy(otherHolder);
Log.e("2","/*/*/*******************************");
}
startAnimation(recyclerView, currentView, targetX, targetY);

} else {
Log.e("3","/*/*/*******************************");
moveOtherToMy(otherHolder);
}
//                        mChannelItemC.onItemClick(v,currentPiosition - COUNT_PRE_MY_HEADER,flag);
}

});
return otherHolder;
}
return null;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof MyViewHolder) {

MyViewHolder myHolder = (MyViewHolder) holder;
myHolder.textView.setText(mMyChannelItems.get(position - COUNT_PRE_MY_HEADER).getName());
if (isEditMode) {
myHolder.imgEdit.setVisibility(View.VISIBLE);
} else {
myHolder.imgEdit.setVisibility(View.INVISIBLE);
}

} else if (holder instanceof OtherViewHolder) {

((OtherViewHolder) holder).textView.setText(mOtherChannelItems.get(position - mMyChannelItems.size() - COUNT_PRE_OTHER_HEADER).getName());

} else if (holder instanceof MyChannelHeaderViewHolder) {

MyChannelHeaderViewHolder headerHolder = (MyChannelHeaderViewHolder) holder;
if (isEditMode) {
headerHolder.tvBtnEdit.setText(R.string.finish);
} else {
headerHolder.tvBtnEdit.setText(R.string.edit);
}
}
}

@Override
public int getItemCount() {
// 我的频道  标题 + 我的频道.size + 其他频道 标题 + 其他频道.size
return mMyChannelItems.size() + mOtherChannelItems.size() + COUNT_PRE_OTHER_HEADER;
}

/**
* 开始增删动画
*/
private void startAnimation(RecyclerView recyclerView, final View currentView, float targetX, float targetY) {
final ViewGroup viewGroup = (ViewGroup) recyclerView.getParent();
final ImageView mirrorView = addMirrorView(viewGroup, recyclerView, currentView);

Animation animation = getTranslateAnimator(
targetX - currentView.getLeft(), targetY - currentView.getTop());
currentView.setVisibility(View.INVISIBLE);
mirrorView.startAnimation(animation);

animation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {
viewGroup.removeView(mirrorView);
if (currentView.getVisibility() == View.INVISIBLE) {
currentView.setVisibility(View.VISIBLE);
}
}

@Override
public void onAnimationRepeat(Animation animation) {

}
});
}

/**
* 我的频道 移动到 其他频道   第一个条目和第二个条目不移动
*
* @param myHolder
*/
private void moveMyToOther(MyViewHolder myHolder,RecyclerView recyclerView,View currentView,int targetX,int targetY) {
int position = myHolder.getAdapterPosition();

int startPosition = position - COUNT_PRE_MY_HEADER;
if (startPosition > mMyChannelItems.size() - 1) {
return;
}else if (startPosition==0||startPosition==1){

//  第一个条目和第二个条目不移动
}else {

// 是否为 编辑 模式
if (isEditMode) {

ChannelEntity item = mMyChannelItems.get(startPosition);
mMyChannelItems.remove(startPosition);
mOtherChannelItems.add(0, item);

notifyItemMoved(position, mMyChannelItems.size() + COUNT_PRE_OTHER_HEADER);
startAnimation( recyclerView, currentView, targetX, targetY);
}else {
ChannelEntity item = mMyChannelItems.get(startPosition);
mMyChannelItems.remove(startPosition);
mOtherChannelItems.add(0, item);

notifyItemMoved(position, mMyChannelItems.size() + COUNT_PRE_OTHER_HEADER);
}

}

}

/**
* 其他频道 移动到 我的频道
*
* @param otherHolder
*/
private void moveOtherToMy(OtherViewHolder otherHolder) {
int position = processItemRemoveAdd(otherHolder);
if (position == -1) {
return;
}
notifyItemMoved(position, mMyChannelItems.size() - 1 + COUNT_PRE_MY_HEADER);
}

/**
* 其他频道 移动到 我的频道 伴随延迟
*
* @param otherHolder
*/
private void moveOtherToMyWithDelay(OtherViewHolder otherHolder) {
final int position = processItemRemoveAdd(otherHolder);
if (position == -1) {
return;
}
delayHandler.postDelayed(new Runnable() {
@Override
public void run() {
notifyItemMoved(position, mMyChannelItems.size() - 1 + COUNT_PRE_MY_HEADER);
}
}, ANIM_TIME);
}

private Handler delayHandler = new Handler();

private int processItemRemoveAdd(OtherViewHolder otherHolder) {
int position = otherHolder.getAdapterPosition();

int startPosition = position - mMyChannelItems.size() - COUNT_PRE_OTHER_HEADER;
if (startPosition > mOtherChannelItems.size() - 1) {
return -1;
}
ChannelEntity item = mOtherChannelItems.get(startPosition);
mOtherChannelItems.remove(startPosition);
mMyChannelItems.add(item);
return position;
}

/**
* 添加需要移动的 镜像View
*/
private ImageView addMirrorView(ViewGroup parent, RecyclerView recyclerView, View view) {
/**
* 我们要获取cache首先要通过setDrawingCacheEnable方法开启cache，然后再调用getDrawingCache方法就可以获得view的cache图片了。
buildDrawingCache方法可以不用调用，因为调用getDrawingCache方法时，若果cache没有建立，系统会自动调用buildDrawingCache方法生成cache。
若想更新cache, 必须要调用destoryDrawingCache方法把旧的cache销毁，才能建立新的。
当调用setDrawingCacheEnabled方法设置为false, 系统也会自动把原来的cache销毁。
*/
view.destroyDrawingCache();
view.setDrawingCacheEnabled(true);
final ImageView mirrorView = new ImageView(recyclerView.getContext());
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
mirrorView.setImageBitmap(bitmap);
view.setDrawingCacheEnabled(false);
int[] locations = new int[2];
view.getLocationOnScreen(locations);
int[] parenLocations = new int[2];
recyclerView.getLocationOnScreen(parenLocations);
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(bitmap.getWidth(), bitmap.getHeight());
params.setMargins(locations[0], locations[1] - parenLocations[1], 0, 0);
parent.addView(mirrorView, params);

return mirrorView;
}

/**
*   移动过程中更新适配器********************************************************* 处理移动后的数据 ********************************************************************
* @param fromPosition
* @param toPosition
*/
@Override
public void onItemMove(int fromPosition, int toPosition) {
if (toPosition==1||toPosition==2){
return;
}
Log.e("fromPosition",fromPosition+"/****************************");
Log.e("toPosition",toPosition+"/****************************");
ChannelEntity item = mMyChannelItems.get(fromPosition - COUNT_PRE_MY_HEADER);
mMyChannelItems.remove(fromPosition - COUNT_PRE_MY_HEADER);
mMyChannelItems.add(toPosition - COUNT_PRE_MY_HEADER, item);
notifyItemMoved(fromPosition, toPosition);

//是否需要保存
flag=true;
//        mChannelItemC.onItemClick(view,toPosition - COUNT_PRE_MY_HEADER,flag);
}

/**
* 开启编辑模式   默认第一条和第二条不显示可编辑
*
* @param parent
*/
private void startEditMode(RecyclerView parent) {
isEditMode = true;

int visibleChildCount = parent.getChildCount();
for (int i = 0; i < visibleChildCount; i++) {
View view = parent.getChildAt(i);
ImageView imgEdit = (ImageView) view.findViewById(R.id.img_edit);
if (imgEdit != null) {
if (i==1||i==2){
imgEdit.setVisibility(View.GONE);
}else {
imgEdit.setVisibility(View.VISIBLE);
}

}
}
}

/**
* 完成编辑模式
*
* @param parent
*/
private void cancelEditMode(RecyclerView parent) {
isEditMode = false;

int visibleChildCount = parent.getChildCount();
for (int i = 0; i < visibleChildCount; i++) {
View view = parent.getChildAt(i);
ImageView imgEdit = (ImageView) view.findViewById(R.id.img_edit);
if (imgEdit != null) {

imgEdit.setVisibility(View.INVISIBLE);
}
}
}

/**
* 获取位移动画
*/
private TranslateAnimation getTranslateAnimator(float targetX, float targetY) {
TranslateAnimation translateAnimation = new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0f,
Animation.ABSOLUTE, targetX,
Animation.RELATIVE_TO_SELF, 0f,
Animation.ABSOLUTE, targetY);
// RecyclerView默认移动动画250ms 这里设置360ms 是为了防止在位移动画结束后 remove(view)过早 导致闪烁
translateAnimation.setDuration(ANIM_TIME);
translateAnimation.setFillAfter(true);
return translateAnimation;
}

/**
*  接口回调
*/
public interface OnMyChannelItemClickListener {
void onItemClick(View v, int position);
}

public void setOnMyChannelItemClickListener(OnMyChannelItemClickListener listener) {
this.mChannelItemClickListener = listener;
}

public interface OnMyChannelItemC {
void onItemClick(View v, int position,boolean a);
}

public void setOnMyChannelItemC(OnMyChannelItemC listener) {
this.mChannelItemC = listener;
}

/**
* 我的频道
*/
class MyViewHolder extends RecyclerView.ViewHolder implements OnDragVHListener {
private TextView textView;
private ImageView imgEdit;

public MyViewHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.tv);
imgEdit = (ImageView) itemView.findViewById(R.id.img_edit);
}

/**
* item 被选中时
*/
@Override
public void onItemSelected() {
textView.setBackgroundResource(R.drawable.bg_channel_p);
}

/**
* item 取消选中时
*/
@Override
public void onItemFinish() {
textView.setBackgroundResource(R.drawable.bg_channel);
}
}

/**
* 其他频道
*/
class OtherViewHolder extends RecyclerView.ViewHolder {
private TextView textView;

public OtherViewHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.tv);
}
}

/**
* 我的频道  标题部分
*/
class MyChannelHeaderViewHolder extends RecyclerView.ViewHolder {
private TextView tvBtnEdit;
LinearLayout llback;

public MyChannelHeaderViewHolder(View itemView) {
super(itemView);
tvBtnEdit = (TextView) itemView.findViewById(R.id.tv_btn_edit);
llback= (LinearLayout) itemView.findViewById(R.id.ll_back);
}
}

}

/**
* 获取频道列表  已选的
*/
public List<ChannelEntity> getChannnelLst() {
return mMyChannelItems;
}

/**
* 获取频道列表  未选的
*/
public List<ChannelEntity> getChannnelLstother() {
return mOtherChannelItems;
}

/**
* ItemDragHelperCallback
*
*/
public class ItemDragHelperCallback extends ItemTouchHelper.Callback {

@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int dragFlags;
RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
if (manager instanceof GridLayoutManager || manager instanceof StaggeredGridLayoutManager) {
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
} else {
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
}
// 如果想支持滑动(删除)操作, swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END
int swipeFlags = 0;
return makeMovementFlags(dragFlags, swipeFlags);
}

@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
// 不同Type之间不可移动
if (viewHolder.getItemViewType() != target.getItemViewType()) {
return false;
}

if (recyclerView.getAdapter() instanceof OnItemMoveListener) {
OnItemMoveListener listener = ((OnItemMoveListener) recyclerView.getAdapter());
listener.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
}
return true;
}

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

}

@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
// 不在闲置状态
if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
if (viewHolder instanceof OnDragVHListener) {
OnDragVHListener itemViewHolder = (OnDragVHListener) viewHolder;
itemViewHolder.onItemSelected();
}
}
super.onSelectedChanged(viewHolder, actionState);
}

@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
if (viewHolder instanceof OnDragVHListener) {
OnDragVHListener itemViewHolder = (OnDragVHListener) viewHolder;
itemViewHolder.onItemFinish();
}
super.clearView(recyclerView, viewHolder);
}

@Override
public boolean isLongPressDragEnabled() {
// 不支持长按拖拽功能 手动控制
return false;
}

@Override
public boolean isItemViewSwipeEnabled() {
// 不支持滑动功能
return false;
}
}