我正在创建一个Android应用程序。我正在使用先进的Recycler View。我实现了拖放功能。
当我拖动某个项目时，如果我超出屏幕尺寸，则该列表不会自动滚动。
也就是说，拖动的项目进入屏幕结束并消失。
由于这是第三方图书馆，我对此并不了解。
为什么拖动项目时列表不会自动滚动？
包含回收者视图的对话框：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/toolbar_elite"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp">
<android.support.v7.widget.AppCompatImageView
android:id="@+id/elite_list_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerVertical="true"
android:background="@null"
android:cropToPadding="true"
android:paddingLeft="4dp"
android:paddingRight="0dp"
android:scaleType="fitStart"
app:srcCompat="@drawable/left_white" />
<com.kyleduo.switchbutton.SwitchButton
android:id="@+id/elite_list_switch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginEnd="10dp"
android:textColor="@color/colorWhite"
android:textSize="16sp"
android:textStyle="bold"
app:kswBackColor="@color/black"
app:kswBackDrawable="@drawable/switch_bg"
app:kswBackMeasureRatio="1.45"
app:kswBackRadius="7.5sp"
app:kswTextOff="@string/all_caps"
app:kswThumbDrawable="@drawable/switch_background_white"
app:kswThumbHeight="35dp"
app:kswThumbMarginBottom="-20dp"
app:kswThumbMarginLeft="4dp"
app:kswThumbMarginRight="3dp"
app:kswThumbMarginTop="-20dp"
app:kswThumbRadius="20dp"
app:kswThumbWidth="35dp" />
<Button
android:id="@+id/elite_remove"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginEnd="10dp"
android:text="Remove"
android:textAllCaps="false"
android:textColor="@color/black"
android:visibility="gone" />
</RelativeLayout>
<TextView
android:id="@+id/elite_list_username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/toolbar_elite"
android:layout_centerHorizontal="true"
android:gravity="center"
android:text="@string/username_elite_7"
android:textAllCaps="true"
android:textColor="@android:color/black"
android:textSize="28sp"
android:textStyle="bold" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/elite_list_username"
android:layout_marginTop="10dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/no_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:gravity="center"
android:text="No List Found"
android:textAllCaps="true"
android:textColor="@android:color/black"
android:textSize="18sp"
android:textStyle="bold"
android:visibility="gone" />
<android.support.v7.widget.RecyclerView
android:id="@+id/elite_drivers_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>
物品设计：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="@drawable/background_line_view"
android:padding="10dp"
android:id="@+id/elite_recycle">
<ImageView
android:id="@+id/elite_driver_image"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:background="@drawable/ic_nav_profile"
android:foregroundGravity="center" />
<ImageView
android:id="@+id/background"
android:layout_width="25dp"
android:layout_height="25dp"
android:background="@drawable/check_box_unchecked"
android:scaleType="fitXY"
android:layout_marginRight="25dp"
android:foregroundGravity="center"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_marginEnd="70dp" />
<android.support.v7.widget.AppCompatCheckBox
android:id="@+id/elite_check_box"
android:layout_width="25dp"
android:layout_height="25dp"
android:background="@android:color/transparent"
android:button="@android:color/transparent"
android:layout_marginRight="30dp"
android:layout_centerVertical="true"
android:layout_alignStart="@+id/background" />
<ImageView
android:layout_width="25dp"
android:layout_height="25dp"
android:scaleType="fitXY"
android:layout_marginStart="20dp"
android:layout_marginEnd="25dp"
android:background="@drawable/remove"
android:id="@+id/remove_img"
android:layout_marginTop="3dp"
android:foregroundGravity="left"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="55dp"
android:layout_height="18dp"
android:text="Remove"
android:id="@+id/remove_tv"
android:textColor="@color/black"
android:textAllCaps="true"
android:paddingTop="3dp"
android:layout_marginEnd="5dp"
android:layout_toStartOf="@+id/elite_check_box"
android:layout_alignBottom="@+id/elite_driver_vehicle"
android:layout_alignParentEnd="true" />
<TextView
android:id="@+id/elite_driver_vehicle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/elite_driver_image"
android:layout_toRightOf="@id/elite_driver_image"
android:layout_toLeftOf="@id/elite_check_box"
android:paddingBottom="8dp"
android:text="@string/vehicle_type"
android:textAllCaps="true"
android:textColor="@color/black"
android:textSize="18sp" />
<TextView
android:id="@+id/elite_driver_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@id/elite_driver_vehicle"
android:layout_toRightOf="@id/elite_driver_image"
android:layout_toLeftOf="@id/elite_check_box"
android:paddingTop="5dp"
android:text="@string/driver_name"
android:textAllCaps="true"
android:textColor="@color/black"
android:textSize="18sp" />
<View
android:id="@+id/drag_handle2"
android:layout_width="32dp"
android:layout_height="match_parent" />
</RelativeLayout>
适配器类：
package com.nuvo.rider.adapter;
public class EliteDriverListAdapter extends RecyclerView.Adapter<EliteDriverListAdapter.ViewHolder> implements DraggableItemAdapter<EliteDriverListAdapter.ViewHolder> {
public List<String> strSelectedDrivers = new ArrayList<>();
public boolean mIsAllClicked = false;
private Activity activity;
private List<YourTrips> AlertMessageList = new ArrayList<>();
private List<YourTrips> eliteList;
String riderId,driverId;
ProgressDialog progressDialog;
private interface Draggable extends DraggableItemConstants {
}
// YourTrips driver;
public EliteDriverListAdapter(Activity activity, List<YourTrips> eliteList) {
this.activity = activity;
this.eliteList = eliteList;
SharedPreferences prefs = activity.getSharedPreferences(Constants.MY_PREFS_NAME, MODE_PRIVATE);
riderId = prefs.getString("userid", null);
System.out.println("UserID in driver_id" + riderId + driverId);
setHasStableIds(true);
}
@Override
public EliteDriverListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View listView = activity.getLayoutInflater().inflate(R.layout.elite_list_adapter, parent, false);
FontChangeCrawler fontChanger = new FontChangeCrawler(activity.getAssets(), activity.getString(R.string.app_font));
fontChanger.replaceFonts((ViewGroup) listView);
AlertMessageList = getFavorites(activity);
return new ViewHolder(listView);
}
@Override
public void onBindViewHolder(final EliteDriverListAdapter.ViewHolder holder, final int position) {
boolean dragging = false;
final int dragState = holder.getDragStateFlags();
if (((dragState & Draggable.STATE_FLAG_IS_UPDATED) != 0)) {
int bgResId=0;
if ((dragState & Draggable.STATE_FLAG_IS_ACTIVE) != 0) {
bgResId = Color.GRAY;
dragging = true;
if (position == 7 ) bgResId = Color.GREEN;
;
// need to clear drawable state here to get correct appearance of the dragging item.
// DrawableUtils.clearState(holder.lastview.getForeground());
} else if ((dragState & Draggable.STATE_FLAG_DRAGGING) != 0) {
// bgResId = Color.GREEN;
} else {
// bgResId =Color.YELLOW;
}
holder.lastview.setBackgroundColor(bgResId);
System.out.println("elite drag color = > "+bgResId );
}
final YourTrips driver = eliteList.get(position);
if (mIsAllClicked) {
System.out.println("if-->");
Constants.strSelectedDrivers.add(driver.getDriverID());
holder.elite_check_box.setChecked(true);
holder.background.setImageResource(R.drawable.check_box_checked);
} else {
System.out.println("else if-->");
holder.elite_check_box.setChecked(false);
holder.background.setImageResource(R.drawable.check_box_unchecked);
}
if (driver.getDriverImage() != null && !driver.getDriverImage().isEmpty()) {
Glide.with(activity).load(driver.getDriverImage()).asBitmap().centerCrop().error(R.drawable.account_picture)
.skipMemoryCache(false).into(new BitmapImageViewTarget(holder.profileImage) {
@Override
protected void setResource(Bitmap resource) {
RoundedBitmapDrawable circularBitmapDrawable =
RoundedBitmapDrawableFactory.create(activity.getResources(), resource);
circularBitmapDrawable.setCircular(true);
holder.profileImage.setImageDrawable(circularBitmapDrawable);
}
});
}
if (driver.getDriverName() != null && !driver.getDriverName().isEmpty()) {
holder.elite_driver_name.setText(driver.getDriverName());
System.out.println("Elite == > driver name"+driver.getDriverName());
}
if (driver.getCarType() != null && !driver.getCarType().isEmpty()) {
holder.elite_driver_vehicle.setText(driver.getCarType().replaceAll("_"," ").replaceAll("[\\[\\]]", "").trim());
System.out.println("Elite == > driver cartype"+driver.getCarType());
}
if (position == 7 && dragging == false) holder.lastview.setBackgroundColor(Color.GREEN);
else if (position < 7 && dragging == false) holder.lastview.setBackgroundColor (activity.getResources().getColor(R.color.colorPrimary));
holder.elite_check_box.setTag(position);
if (!mIsAllClicked) {
if (driver.getCheckedState() != null && !driver.getCheckedState().isEmpty()) {
System.out.println("checked status in the adapter-" + driver.getCheckedState());
if (driver.getCheckedState().equals("checked")) {
holder.elite_check_box.setChecked(true);
holder.background.setImageResource(R.drawable.check_box_checked);
System.out.println("if part");
} else if (driver.getCheckedState().equals("unchecked")) {
System.out.println("else part");
holder.elite_check_box.setChecked(false);
holder.background.setImageResource(R.drawable.check_box_unchecked);
}
}
}
holder.elite_check_box.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
String driverId = eliteList.get((Integer) buttonView.getTag()).getDriverID();
if (!mIsAllClicked) {
if (isChecked) {
Log.d("adapter", String.valueOf((Integer) buttonView.getTag()));
holder.background.setImageResource(R.drawable.check_box_checked);
if (driverId != null && !driverId.isEmpty())
Constants.strSelectedDrivers.add(driverId);
for(int i =0;i<Constants.strSelectedDrivers.size();i++){
System.out.println("elite driver added selected id"+Constants.strSelectedDrivers.get(i));
}
} else {
System.out.println("clear id in the checkbox");
holder.background.setImageResource(R.drawable.check_box_unchecked);
if (driverId != null && !driverId.isEmpty() && Constants.strSelectedDrivers.contains(driverId)) {
Constants.strSelectedDrivers.remove(driverId);
}
}
System.out.println("THE ADAPTER SELECTEDDRIVERS"+Constants.strSelectedDrivers);
}
}
});
holder.elite_driver_remove.setTag(position);
holder.elite_driver_remove.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
driverId = driver.getDriverID();
AlertDialog.Builder builder = new AlertDialog.Builder(activity, R.style.AppCompatAlertDialogStyle);
String title = GlobalAlertMessage("elite_driver_remove_r","Alert!","Are you sure ! You Wanna Remove this Elite Driver "+driver.getDriverName()+" from Your Elite List ?")[0];
String desc = GlobalAlertMessage("elite_driver_remove_r","Alert!","Are you sure ! You Wanna Remove this Elite Driver "+driver.getDriverName()+" from Your Elite List ?")[1];
builder.setTitle(title);
builder.setMessage(desc);
builder.setCancelable(true);
builder.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
System.out.println("remove driver id-->"+driver.getDriverID()+" "+riderId);
String url = Constants.LIVE_URL + "removeEliteDriver/rider_id/" + riderId + "/driver_id/" + driver.getDriverID();
System.out.println("Elite remove URL : "+url);
showDialog();
JsonArrayRequest remove_elite = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
try {
JSONObject response2 = response.getJSONObject(0);
if (response2.optString("status").equalsIgnoreCase("success")){
dismissDialog();
Toast.makeText(activity, "This driver "+driver.getDriverName()+" is successfully removed from your elite driver list.",
Toast.LENGTH_SHORT).show();
eliteList.remove(position);
EliteDriverListAdapter.this.notifyItemRemoved(position);
EliteDriverListAdapter.this.notifyDataSetChanged();
}
else
{
dismissDialog();
Toast.makeText(activity, "This driver "+driver.getDriverName()+" is NOT removed from your elite driver list.",
Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
dismissDialog();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
System.out.println("get error response"+error.getMessage());
Toast.makeText(activity,"Internet Connection error!",Toast.LENGTH_LONG).show();
}
});
remove_elite.setRetryPolicy(new DefaultRetryPolicy(20 * 1000, 5, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(remove_elite);
}
});
builder.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
holder.elite_driver_remove.setSelected(false);
dialogInterface.dismiss();
}
});
builder.show();
}
});
}
@Override
public int getItemCount() {
return eliteList.size();
}
@Override
public boolean onCheckCanStartDrag(ViewHolder holder, int position, int x, int y) {
return true;
}
@Override
public ItemDraggableRange onGetItemDraggableRange(ViewHolder holder, int position) {
return null;
}
@Override
public void onMoveItem(final int fromPosition, final int toPosition) {
YourTrips removed = eliteList.remove(fromPosition);
eliteList.add(toPosition, removed);
notifyDataSetChanged();
dismissDialog();
Toast.makeText(activity, "Elite Driver positions changed",
Toast.LENGTH_SHORT).show();
}
@Override
public boolean onCheckCanDrop(int draggingPosition, int dropPosition) {
return false;
}
@Override
public long getItemId(int position) {
// requires static value, it means need to keep the same value
// even if the item position has been changed.
return eliteList.get(position).getId();
}
class ViewHolder extends AbstractDraggableItemViewHolder {
ImageView profileImage, background, elite_driver_remove;
CheckBox elite_check_box;
TextView elite_driver_name, elite_driver_vehicle, elite_remove;
RelativeLayout lastview;
View dragHandle;
ViewHolder(View itemView) {
super(itemView);
elite_driver_vehicle = (TextView) itemView.findViewById(R.id.elite_driver_vehicle);
elite_driver_name = (TextView) itemView.findViewById(R.id.elite_driver_name);
elite_check_box = (CheckBox) itemView.findViewById(R.id.elite_check_box);
profileImage = (ImageView) itemView.findViewById(R.id.elite_driver_image);
background = (ImageView) itemView.findViewById(R.id.background);
elite_driver_remove = (ImageView) itemView.findViewById(R.id.remove_img);
elite_remove = (TextView) itemView.findViewById(R.id.remove_tv);
dragHandle = (View) itemView.findViewById(R.id.drag_handle2);
lastview = (RelativeLayout) itemView.findViewById(R.id.elite_recycle);
}
}
public String[] GlobalAlertMessage(String code,String title,String desc){
String[] arr = new String[2];
for (int i1 = 0; i1 < AlertMessageList.size(); i1++) {
if (AlertMessageList.get(i1).getmessageCode().equals(code)) {
arr[0] = AlertMessageList.get(i1).getMessagetitle();
arr[1]= AlertMessageList.get(i1).getmessageDesc();
System.out.println("title--->"+title);
System.out.println("desc--->"+desc);
break;
} else {
System.out.println("Not Exist : " + AlertMessageList.get(i1));
arr[0] = title;
arr[1] = desc;
}
}
return arr;
}
public ArrayList<YourTrips> getFavorites(Context context) {
SharedPreferences settings;
List<YourTrips> favorites;
settings = context.getSharedPreferences(Constants.MY_PREFS_NAME_ALERT,
Context.MODE_PRIVATE);
if (settings.contains(Constants.FAVORITES)) {
String jsonFavorites = settings.getString(Constants.FAVORITES, null);
Gson gson = new Gson();
YourTrips[] favoriteItems = gson.fromJson(jsonFavorites,
YourTrips[].class);
favorites = Arrays.asList(favoriteItems);
favorites = new ArrayList<YourTrips>(favorites);
} else
return null;
return (ArrayList<YourTrips>) favorites;
}
}
启动Dialog的活动
final Dialog eliteDriverList = new Dialog(RideLater.this, android.R.style.Theme_DeviceDefault_Light_NoActionBar_Fullscreen);
eliteDriverList.setContentView(R.layout.dialog_elite_drivers_list);
eliteDriverList.setCancelable(true);
ImageView elite_list_back = (ImageView) eliteDriverList.findViewById(R.id.elite_list_back);
SwitchButton elite_list_switch = (SwitchButton) eliteDriverList.findViewById(R.id.elite_list_switch);
TextView elite_list_username = (TextView) eliteDriverList.findViewById(R.id.elite_list_username);
Button eliteSubmit = (Button) eliteDriverList.findViewById (R.id.submit_elite);
RecyclerView elite_drivers_list = (RecyclerView) eliteDriverList.findViewById(R.id.elite_drivers_list);
RecyclerViewDragDropManager dragMgr = new RecyclerViewDragDropManager();
RelativeLayout last_view = (RelativeLayout) eliteDriverList.findViewById(R.id.last_view);
dragMgr.setInitiateOnLongPress(true);
dragMgr.setInitiateOnMove(false);
elite_list_switch.setTypeface(normal);
elite_list_username.setTypeface(demibold);
elite_list_username.setText(getString(R.string.username_elite_7, riderfirstname));
final EliteDriverListAdapter eliteDriverAdapter = new EliteDriverListAdapter(RideLater.this, listFeedItems);
RecyclerView.Adapter wrappedAdapter = dragMgr.createWrappedAdapter(eliteDriverAdapter);
elite_drivers_list.setLayoutManager(new LinearLayoutManager(RideLater.this, LinearLayoutManager.VERTICAL, false));
elite_drivers_list.setNestedScrollingEnabled(true);
elite_drivers_list.setAdapter(wrappedAdapter);
((SimpleItemAnimator) elite_drivers_list.getItemAnimator()).setSupportsChangeAnimations(false);
dragMgr.attachRecyclerView(elite_drivers_list);
getEliteFromWeb(eliteDriverAdapter,last_view);
elite_list_switch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
eliteDriverAdapter.strSelectedDrivers.clear();
eliteDriverAdapter.mIsAllClicked = true;
eliteDriverAdapter.notifyDataSetChanged();
} else {
eliteDriverAdapter.strSelectedDrivers.clear();
eliteDriverAdapter.mIsAllClicked = false;
eliteDriverAdapter.notifyDataSetChanged();
}
}
});
elite_list_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!isFinishing()) {
listFeedItems.clear();
eliteDriverAdapter.notifyDataSetChanged();
}
eliteDriverList.dismiss();
}
});
eliteSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!isFinishing()) {
listFeedItems.clear();
eliteDriverAdapter.notifyDataSetChanged();
}
eliteDriverList.dismiss();
}
});
if (!isFinishing()) {
eliteDriverList.show();
}
}