关于频道管理，可拖拽 长按可选择删除

关于频道管理的步骤，根据步骤就可以少出错

1、mainActivity布局，添加values中color
2、drawable中设置两个圆角的自定义还有一个删除的图片
3、导入依赖。主要是recycle的依赖
包括dependencies 中的信息
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:25.0.1'
compile 'com.android.support:recyclerview-v7:25.0.1'
}
4、编写ItemBean类
5、编写DataTools类
6、编写SimpleItemTouchHelperCallback
7、编写ItemTouchHelperAdapter接口，interface修饰的接口
8、编写RecyclerItemClickListener类
9、编写第二个布局item_list
1、首先在values中color属性里面添加

<color name="red">#DF3234</color>
<color name="black">#000000</color>
<color name="white">#FFFFFF</color>
<color name="hui">#999999</color>

2、在draw中创建两个文件redsharp跟sharp
redsharp

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"

>
<solid android:color="@color/white" /> <!-- 定义填充的颜色值 -->
<padding
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp" />
<!-- 设置圆角矩形 -->
<corners android:radius="100dp" />
<stroke android:width="2dp" android:color="@color/red" />
</shape>

sharp中代码

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<padding
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp" />
<!-- 设置圆角矩形 -->
<corners android:radius="1dp" />
<stroke android:width="0.5dp" android:color="#000000" />
</shape>

3、导入recycle的依赖，为了避免v7包跟v4包重复，我直接贴出来dependencees需要的代码

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:25.0.1'
compile 'com.android.support:recyclerview-v7:25.0.1'
}

4、编写ItemBean类，类中的代码

public ItemBean(String text, boolean select) {
this.text = text;
this.select = select;
}

private  String  text;
private  boolean  select;

public String getText() {
return text;
}

public void setText(String text) {
this.text = text;
}

public boolean isSelect() {
return select;
}

public void setSelect(boolean select) {
this.select = select;
}

5、编写dataTools，类中的代码

public static int dip2px(Context context, int dipValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}

6、编写SimpleItemTouchHelperCallback类，代码

public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {

private ItemTouchHelperAdapter mAdapter;

public SimpleItemTouchHelperCallback(ItemTouchHelperAdapter adapter) {
mAdapter = adapter;
}

@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT; //允许上下左右的拖动
return makeMovementFlags(dragFlags, 0);
}

@Override
public boolean isLongPressDragEnabled() {

return false;//长按启用拖拽
}

@Override
public boolean isItemViewSwipeEnabled() {
return false; //不启用拖拽删除
}

@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
//通过接口传递拖拽交换数据的起始位置和目标位置的ViewHolder
mAdapter.onItemMove(source, target);
return true;
}

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
//移动删除回调,如果不用可以不用理
// mAdapter.onItemDissmiss(viewHolder);
}

@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
super.onSelectedChanged(viewHolder, actionState);
if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
//当滑动或者拖拽view的时候通过接口返回该ViewHolder
mAdapter.onItemSelect(viewHolder);
}
}

@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);
if (!recyclerView.isComputingLayout()) {
//当需要清除之前在onSelectedChanged或者onChildDraw,onChildDrawOver设置的状态或者动画时通过接口返回该ViewHolder
mAdapter.onItemClear(viewHolder);
}
}
}

7、编写ItemTouchHelperAdapter接口，interface修饰的接口。代码

public interface ItemTouchHelperAdapter {
//数据交换
void onItemMove(RecyclerView.ViewHolder source, RecyclerView.ViewHolder target);
//数据删除
void onItemDissmiss(RecyclerView.ViewHolder source);
//drag或者swipe选中
void onItemSelect(RecyclerView.ViewHolder source);
//状态清除
void onItemClear(RecyclerView.ViewHolder source);
}

8、编写RecycleItemClickListener类

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener{
private View childView;
private RecyclerView touchView;
private RecyclerView.ViewHolder viewHolder;
GestureDetector mGestureDetector;

public RecyclerItemClickListener(Context context, final OnItemClickListener mListener) {
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener(){
@Override
public boolean onSingleTapUp(MotionEvent ev) {
if (childView != null && mListener != null) {
mListener.onItemClick(childView, touchView.getChildPosition(childView),viewHolder);
}
return true;
}
@Override
public void onLongPress(MotionEvent ev) {
if (childView != null && mListener != null) {
mListener.onLongClick(childView, touchView.getChildPosition(childView),viewHolder);
}
}
});
}

public interface OnItemClickListener {
public void onItemClick(View view, int position, RecyclerView.ViewHolder viewHolder);
public void onLongClick(View view, int posotion, RecyclerView.ViewHolder viewHolder);
}

@Override
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
mGestureDetector.onTouchEvent(motionEvent);
childView = recyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
touchView = recyclerView;
if (childView!=null){
viewHolder = recyclerView.getChildViewHolder(childView);
}
return false;
}

@Override
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {

}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

}
}

9、编写第二个布局文件item_list

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/channel_rl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:background="@drawable/sharp"

>

<TextView
android:id="@+id/channel_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:text="fdsgfdgdfgdfg"
android:textSize="16sp" />

<TextView
android:id="@+id/delete_tv"
android:layout_width="15dp"
android:layout_height="15dp"
android:background="@drawable/delete" />
</RelativeLayout>

10、最后一步就是mainActivity里边的方法

public class MainActivity extends AppCompatActivity {

private RecyclerView minerecycleView;
private List<ItemBean> mineData = new ArrayList<ItemBean>();
private List<ItemBean> otherData = new ArrayList<ItemBean>();
private ItemTouchHelper.Callback callback;
private ItemTouchHelper touchHelper;
private ItemTouchHelper.Callback othercallback;
private ItemTouchHelper othertouchHelper;
private MyAdapter otherAdapter;
private RecyclerView other_recycleView;
private MyAdapter mineAdapter;
private TextView edit;
boolean isediting = false;
private int screenWidth;
private int recycleview_width;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
screenWidth = dm.widthPixels;
recycleview_width = (screenWidth - DataTools.dip2px(MainActivity.this, 60)) / 3;
initData();
initView();
}

private void initView() {
minerecycleView = (RecyclerView) findViewById(R.id.mine_recycleView);
edit = (TextView) findViewById(R.id.edit);

mineAdapter = new MyAdapter(mineData, 0);
//minerecycleView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
minerecycleView.setAdapter(mineAdapter);
minerecycleView.setLayoutManager(new GridLayoutManager(this, 3));
callback = new SimpleItemTouchHelperCallback(mineAdapter);
//用Callback构造ItemtouchHelper
touchHelper = new ItemTouchHelper(callback);
touchHelper.attachToRecyclerView(minerecycleView);

other_recycleView = (RecyclerView) findViewById(R.id.other_recycleView);
otherAdapter = new MyAdapter(otherData, 1);
//other_recycleView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
other_recycleView.setAdapter(otherAdapter);
other_recycleView.setLayoutManager(new GridLayoutManager(this, 3));
othercallback = new SimpleItemTouchHelperCallback(otherAdapter);

//用Callback构造ItemtouchHelper
othertouchHelper = new ItemTouchHelper(othercallback);
othertouchHelper.attachToRecyclerView(other_recycleView);

edit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (isediting) {
edit.setText("编辑");
for (int i = 0; i < mineData.size(); i++) {
mineData.get(i).setSelect(false);
}
} else {
edit.setText("完成");
for (int i = 0; i < mineData.size(); i++) {
mineData.get(i).setSelect(true);
}
}
isediting = !isediting;
mineAdapter.notifyDataSetChanged();

}
});

minerecycleView.addOnItemTouchListener(new RecyclerItemClickListener(MainActivity.this, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position, RecyclerView.ViewHolder childViewViewHolder) {

}

@Override
public void onLongClick(View view, int posotion, RecyclerView.ViewHolder childViewViewHolder) {
if (posotion != 0 && posotion != 1) {
touchHelper.startDrag(childViewViewHolder);
}

}
}));

other_recycleView.addOnItemTouchListener(new RecyclerItemClickListener(MainActivity.this, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, final int position, RecyclerView.ViewHolder childViewViewHolder) {

final ImageView moveImageView = getView(view);
if (moveImageView != null) {
TextView newTextView = (TextView) view.findViewById(R.id.channel_tv);
final int[] startLocation = new int[2];
newTextView.getLocationInWindow(startLocation);
final ItemBean channel = otherAdapter.getItem(position);
if (isediting) {
channel.setSelect(true);
} else {
channel.setSelect(false);
}
mineAdapter.addItem(channel);
new Handler().postDelayed(new Runnable() {
public void run() {
try {
int[] endLocation = new int[2];
RecyclerView.LayoutManager mine_layoutManager = minerecycleView.getLayoutManager();
if (mine_layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearManager = (LinearLayoutManager) mine_layoutManager;
int lastItemPosition = linearManager.findLastVisibleItemPosition();
minerecycleView.getChildAt(lastItemPosition).getLocationInWindow(endLocation);
MoveAnim(moveImageView, startLocation, endLocation);
otherAdapter.deleteItem(position);
}
} catch (Exception localException) {
}

}
}, 50L);
}
}

@Override
public
void onLongClick(View view, int posotion, RecyclerView.ViewHolder childViewViewHolder) {

}
}));

}

private void initData() {

for (int i = 0; i < 15; i++) {
mineData.add(new ItemBean("我的" + i, false));
}
for (int i = 15; i < 30; i++) {
otherData.add(new ItemBean("其他" + i, false));
}
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> implements ItemTouchHelperAdapter {

private List<ItemBean> mData;
private int type;

//    自己  长按出×    按  ×删除     别人的只有  一个点击删除的操作
//    别人的只有点击添加操作

public MyAdapter(List<ItemBean> list, int type) {
this.mData = list;
this.type = type;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View root = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_list, parent, false);
MyViewHolder vh = new MyViewHolder(root);
//为Item设置点击事件

return vh;
}

@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
holder.channel_tv.setText(mData.get(position).getText());
if (type == 1) {
holder.delete_tv.setVisibility(View.GONE);
} else if (type == 0) {
if (position == 0 || position == 1) {
holder.delete_tv.setVisibility(View.GONE);
} else if (mData.get(position).isSelect()) {
holder.delete_tv.setVisibility(View.VISIBLE);
} else {
holder.delete_tv.setVisibility(View.GONE);
}
}
ViewGroup.LayoutParams params = holder.channel_rl.getLayoutParams();
params.width = recycleview_width;
holder.channel_rl.setLayoutParams(params);

holder.delete_tv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (type == 0) {
ItemBean positionItemBean = mineAdapter.getItem(position);
positionItemBean.setSelect(false);
mineAdapter.deleteItem(position);
otherAdapter.addItem(positionItemBean);
}
}
});
}

@Override
public int getItemCount() {
//注意:这里最少有一个,因为有多了一个添加按钮
return null == mData ? 0 : mData.size();
}

public ItemBean getItem(int position) {
return mData.get(position);
}

public void addItem(ItemBean channel) {
mData.add(channel);
notifyDataSetChanged();
}

public void allSelect() {
for (int i = 0; i < mData.size(); i++) {
mData.get(i).setSelect(true);
}
notifyDataSetChanged();
}

public void addItem(int position, ItemBean channel) {
mData.add(position, channel);
notifyDataSetChanged();
}

public void deleteItem(int position) {
mData.remove(position);
notifyDataSetChanged();
}

public class MyViewHolder extends RecyclerView.ViewHolder {
private TextView channel_tv;
private TextView delete_tv;
private RelativeLayout channel_rl;

public MyViewHolder(View itemView) {
super(itemView);
channel_tv = (TextView) itemView.findViewById(R.id.channel_tv);
delete_tv = (TextView) itemView.findViewById(R.id.delete_tv);
channel_rl = (RelativeLayout) itemView.findViewById(R.id.channel_rl);
}
}

//移动处理
public void onItemMove(RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
if (type == 0) {
int fromPosition = source.getAdapterPosition();
int toPosition = target.getAdapterPosition();
if (toPosition == 0 || toPosition == 1) {

} else {
if (fromPosition < mData.size() && toPosition < mData.size()) {
//交换数据位置
//                        Collections.swap(mData, fromPosition, toPosition);
ItemBean itemBean = mData.get(fromPosition);
mData.remove(fromPosition);
mData.add(toPosition, itemBean);
//刷新位置交换
notifyItemMoved(fromPosition, toPosition);
}
}
//移动过程中移除view的放大效果
onItemClear(source);
}
}

//移除
public void onItemDissmiss(RecyclerView.ViewHolder source) {
if (type == 0) {
int position = source.getAdapterPosition();
mData.remove(position); //移除数据
notifyItemRemoved(position);//刷新数据移除
}
}

//放大
public void onItemSelect(RecyclerView.ViewHolder viewHolder) {
if (type == 0) {
//当拖拽选中时放大选中的view
int position = viewHolder.getAdapterPosition();
viewHolder.itemView.setScaleX(1.2f);
viewHolder.itemView.setScaleY(1.2f);
}
}

//恢复
public void onItemClear(RecyclerView.ViewHolder viewHolder) {
//拖拽结束后恢复view的状态
if (type == 0) {
viewHolder.itemView.setScaleX(1.0f);
viewHolder.itemView.setScaleY(1.0f);
}
}

}

private ImageView getView(View view) {
view.destroyDrawingCache();
view.setDrawingCacheEnabled(true);
Bitmap cache = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
ImageView iv = new ImageView(this);
iv.setImageBitmap(cache);
return iv;
}

private void MoveAnim(View moveView, int[] startLocation, int[] endLocation
) {

int[] initLocation = new int[2];
moveView.getLocationInWindow(initLocation);
final ViewGroup moveViewGroup = getMoveViewGroup();
final View mMoveView = getMoveView(moveViewGroup, moveView, initLocation);
TranslateAnimation moveAnimation = new TranslateAnimation(
startLocation[0], endLocation[0], startLocation[1],
endLocation[1]);
moveAnimation.setDuration(300L);
AnimationSet moveAnimationSet = new AnimationSet(true);
moveAnimationSet.setFillAfter(false);
moveAnimationSet.addAnimation(moveAnimation);
mMoveView.startAnimation(moveAnimationSet);
moveAnimationSet.setAnimationListener(new Animation.AnimationListener() {

private boolean isMove;

@Override
public void onAnimationStart(Animation animation) {
isMove = true;
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {
moveViewGroup.removeView(mMoveView);
isMove = false;
}
});
}

private ViewGroup getMoveViewGroup() {
ViewGroup moveViewGroup = (ViewGroup) getWindow().getDecorView();
LinearLayout moveLinearLayout = new LinearLayout(this);
moveLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
moveViewGroup.addView(moveLinearLayout);
return moveLinearLayout;
}

private View getMoveView(ViewGroup viewGroup, View view, int[] initLocation) {
int x = initLocation[0];
int y = initLocation[1];
viewGroup.addView(view);
LinearLayout.LayoutParams mLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
mLayoutParams.leftMargin = x;
mLayoutParams.topMargin = y;
view.setLayoutParams(mLayoutParams);
return view;
}
}

11、mainActivity里边的布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:orientation="horizontal">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center|left"
android:paddingLeft="20dp"
android:text="我的频道" />

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical|left"
android:paddingLeft="10dp"
android:text="长按拖拽替换位置"
android:textSize="15sp" />

<TextView
android:id="@+id/edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:background="@drawable/redsharp"
android:gravity="center"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:text="编辑"
android:textSize="15sp" />

</LinearLayout>

<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/hui" />

<android.support.v7.widget.RecyclerView
android:id="@+id/mine_recycleView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/hui" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:orientation="horizontal">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center|left"
android:paddingLeft="20dp"
android:text="其他频道" />

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical|left"
android:paddingLeft="10dp"
android:text="点击添加替换我的频道中"
android:textSize="15sp" />

</LinearLayout>

<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/hui" />

<android.support.v7.widget.RecyclerView
android:id="@+id/other_recycleView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

</LinearLayout>

PS：频道管理中的数据是用集合添加的假的数据，如果需要更改数据，可以在mainActivity下边的集合中
修改。这是根据自己网上copy的代码，然后整理的编写步骤。