117.Android 简单的拖拽列表+防止越界拖动(BaseRecyclerViewAdapterHelper)

 

 

//1.第一步 导入依赖库和权限：

//依赖库：

//RecyclerView
implementation 'com.android.support:recyclerview-v7:28.0.0'//RecyclerAdapter
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.28'

//用到的权限：

<!--振动-->
<uses-permission android:name="android.permission.VIBRATE" />

 

 

 //2.第二步 新建ItemDraggableActivity页面：

//manifest注册：

<activityandroid:name=".phone.activity.ItemDraggableActivity"android:launchMode="singleTop"android:screenOrientation="portrait"android:windowSoftInputMode="stateHidden"tools:ignore="LockedOrientationActivity" />

//activity代码：

/*** @author CJF*/
public class ItemDraggableActivity extends AppCompatActivity implements BaseQuickAdapter.OnItemChildClickListener, View.OnClickListener {private final GridLayoutManager manager = new GridLayoutManager(this, 3);private final ItemDraggableAdapter adapter = new ItemDraggableAdapter(R.layout.item_draggable_item, new ArrayList<>());/*** 震动时长(毫秒)*/private final int milliseconds = 50;private Vibrator vibrator;private RecyclerView mTreeListRecy;private TextView mEdit;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_tree_list);//点击音效vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);mTreeListRecy = findViewById(R.id.mTreeListRecy);mEdit = findViewById(R.id.mEdit);mEdit.setOnClickListener(this);mTreeListRecy.setLayoutManager(manager);mTreeListRecy.setAdapter(adapter);DragAndSwipeCallback itemDragAndSwipeCallback = new DragAndSwipeCallback(adapter);ItemTouchHelper itemTouchHelper = new ItemTouchHelper(itemDragAndSwipeCallback);itemTouchHelper.attachToRecyclerView(mTreeListRecy);//可以不用设置,可以拖拽的方向，默认上下左右itemDragAndSwipeCallback.setDragMoveFlags(ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);//         开启拖拽 设置可拖拽item的根布局idadapter.enableDragItem(itemTouchHelper, R.id.mItemDraggableItemLin, true);adapter.setOnItemDragListener(onItemDragListener);// 开启滑动删除
//        adapter.enableSwipeItem();
//        adapter.setOnItemSwipeListener(onItemSwipeListener);adapter.setOnItemChildClickListener(this);List<ItemDraggableBean> list = new ArrayList<>();for (int i = 0; i < 10; i++) {ItemDraggableBean bean = new ItemDraggableBean();bean.setName("数据" + i);list.add(bean);}adapter.addData(list);}/*** 拖拽监听*/private OnItemDragListener onItemDragListener = new OnItemDragListener() {@Overridepublic void onItemDragStart(RecyclerView.ViewHolder viewHolder, int pos) {Log.e("TAG1231", "onItemDragStart" + "你在拖拽第" + (pos + 1) + "个位置的item哦！");//震动if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {vibrator.vibrate(VibrationEffect.createOneShot(milliseconds, VibrationEffect.DEFAULT_AMPLITUDE));} else {vibrator.vibrate(milliseconds);}//按住变大viewHolder.itemView.setScaleX(1.2f);viewHolder.itemView.setScaleY(1.2f);viewHolder.itemView.setAlpha(0.5f);//改变数据状态ItemDraggableBean draggableBean = adapter.getData().get(pos);if (!draggableBean.isShow()) {List<ItemDraggableBean> data = adapter.getData();for (ItemDraggableBean bean : data) {bean.setShow(true);}//循环遍历出所有的item布局 并显示图片//注意不可以直接使用 adapter.notifyDataSetChanged();数据刷新会导致直接调用onItemDragEnd()方法for (int i = 0; i < mTreeListRecy.getChildCount(); i++) {View childAt = mTreeListRecy.getChildAt(i);TextView textView = childAt.findViewById(R.id.mItemDraggableItemText);View view = childAt.findViewById(R.id.mItemDraggableItemImg);view.setVisibility(View.VISIBLE);Log.e("TAG1231", "textView:" + textView.getText().toString());}mEdit.setText("完成");}}@Overridepublic void onItemDragMoving(RecyclerView.ViewHolder source, int from, RecyclerView.ViewHolder target, int to) {Log.e("TAG1231", "onItemDragMoving");}@Overridepublic void onItemDragEnd(RecyclerView.ViewHolder viewHolder, int pos) {Log.e("TAG1231", "onItemDragEnd" + "拖拽到了第" + (pos + 1) + "个位置哦！");//变回原来大小viewHolder.itemView.setScaleX(1.0f);viewHolder.itemView.setScaleY(1.0f);viewHolder.itemView.setAlpha(1.0f);}};OnItemSwipeListener onItemSwipeListener = new OnItemSwipeListener() {@Overridepublic void onItemSwipeStart(RecyclerView.ViewHolder viewHolder, int pos) {ToastUtil.getInstance().showToast("继续向左滑动即可删除第" + (pos + 1) + "个位置的item");}@Overridepublic void clearView(RecyclerView.ViewHolder viewHolder, int pos) {}@Overridepublic void onItemSwiped(RecyclerView.ViewHolder viewHolder, int pos) {ToastUtil.getInstance().showToast("删除了第" + (pos + 1) + "个位置的item哦");}@Overridepublic void onItemSwipeMoving(Canvas canvas, RecyclerView.ViewHolder viewHolder, float dX, float dY, boolean isCurrentlyActive) {}};@Overridepublic void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {adapter.remove(position);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.mEdit:boolean isEdit = "编辑".equals(mEdit.getText().toString());List<ItemDraggableBean> data = adapter.getData();for (ItemDraggableBean bean : data) {bean.setShow(isEdit);}adapter.notifyDataSetChanged();mEdit.setText(isEdit ? "完成" : "编辑");break;default:break;}}}

//3.第三步 新建DragAndSwipeCallback类继承ItemDragAndSwipeCallback，重写onChildDraw 防止越界拖动：

/*** @author CJF* 重写onChildDraw 防止越界拖动*/
public class DragAndSwipeCallback extends ItemDragAndSwipeCallback {public DragAndSwipeCallback(BaseItemDraggableAdapter adapter) {super(adapter);}/*** 重写onChildDraw 防止越界拖动** @param c* @param recyclerView* @param viewHolder* @param dX* @param dY* @param actionState* @param isCurrentlyActive*/@Overridepublic void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {float topY = viewHolder.itemView.getTop() + dY;float bottomY = topY + viewHolder.itemView.getHeight();float leftX = viewHolder.itemView.getLeft() + dX;float rightX = leftX + viewHolder.itemView.getWidth();if (topY < 0) {dY = 0;} else if (bottomY > recyclerView.getHeight()) {dY = recyclerView.getHeight() - viewHolder.itemView.getHeight() - viewHolder.itemView.getTop();}if (leftX < 0) {dX = 0;} else if (rightX > recyclerView.getWidth()) {dX = recyclerView.getWidth() - viewHolder.itemView.getWidth() - viewHolder.itemView.getLeft();}super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);}}

//4.第四步 新建ItemDraggableAdapter适配器类：

/*** @author CJF*/
public class ItemDraggableAdapter extends BaseItemDraggableAdapter<ItemDraggableBean, BaseViewHolder> {public ItemDraggableAdapter(List<ItemDraggableBean> data) {super(data);}public ItemDraggableAdapter(int layoutResId, List<ItemDraggableBean> data) {super(layoutResId, data);}@Overrideprotected void convert(BaseViewHolder helper, ItemDraggableBean item) {helper.setText(R.id.mItemDraggableItemText, item.getName());helper.setGone(R.id.mItemDraggableItemImg, item.isShow());helper.addOnClickListener(R.id.mItemDraggableItemImg);}}

//5.第五步 新建ItemDraggableBean类：

/*** @author CJF*/
public class ItemDraggableBean {private String name;private boolean isShow = false;public ItemDraggableBean() {}public ItemDraggableBean(String name, boolean isShow) {this.name = name;this.isShow = isShow;}public String getName() {return name;}public void setName(String name) {this.name = name;}public boolean isShow() {return isShow;}public void setShow(boolean show) {isShow = show;}}

//6.第六步 各个xml布局文件以及svg图片文件：

//activity_tree_list:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"xmlns:app="http://schemas.android.com/apk/res-auto"android:background="@color/color_white"android:orientation="vertical"><TextViewandroid:id="@+id/mEdit"android:background="@drawable/selector_common_item"android:textColor="@color/colorAccent"android:textStyle="bold"android:textSize="18sp"android:gravity="center"android:text="编辑"android:layout_width="match_parent"android:layout_height="wrap_content"/><android.support.v7.widget.RecyclerViewandroid:id="@+id/mTreeListRecy"android:layout_width="match_parent"android:layout_height="match_parent" /></LinearLayout>

//item_draggable_item:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@drawable/bg_search"android:layout_margin="@dimen/dp_5"android:id="@+id/mItemDraggableItemLin"android:orientation="horizontal"><TextViewandroid:id="@+id/mItemDraggableItemText"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="left|center_vertical"android:minHeight="@dimen/dp_50"android:padding="@dimen/dp_10"android:text="text"android:textColor="@color/black"android:textSize="@dimen/sp_15" /><ImageViewandroid:scaleType="center"android:id="@+id/mItemDraggableItemImg"android:src="@drawable/crm_close"android:layout_width="@dimen/dp_50"android:layout_height="match_parent"/></LinearLayout>

//svg图片文件  crm_close：

<vector xmlns:android="http://schemas.android.com/apk/res/android"android:width="24dp"android:height="24dp"android:viewportWidth="24.0"android:viewportHeight="24.0"><pathandroid:fillColor="#FF000000"android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>
</vector>

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