Java 如何在Android中从ArrayList中删除项目
在我的应用程序中,我将2个Java 如何在Android中从ArrayList中删除项目,java,android,android-recyclerview,android-adapter,Java,Android,Android Recyclerview,Android Adapter,在我的应用程序中,我将2个recyclerview合并到一个活动中 我想在一个recyclerview'中添加项目时,将此项目添加到另一个recyclerview`. 在2recyclerViews中,我使用界面将数据发送到活动 但是,当单击recyclerview中的项目时,会在Logcat中显示两个错误 活动代码: public class SuggestFilmActivity extends AppCompatActivity implements SuggestedListener,
recyclerview
合并到一个活动中我想在一个
recyclerview'中添加项目时,将此项目添加到另一个recyclerview`.
在2recyclerViews
中,我使用界面将数据发送到活动
但是,当单击recyclerview
中的项目时,会在Logcat中显示两个错误
活动代码:
public class SuggestFilmActivity extends AppCompatActivity implements SuggestedListener, SuggestedDeleteListener {
@BindView(R.id.toolbarTitleTxt)
TextView toolbarTitleTxt;
@BindView(R.id.suggestFilm_searchEditText)
EditText suggestFilm_searchEditText;
@BindView(R.id.suggestFilm_searchBtn)
ImageView suggestFilm_searchBtn;
@BindView(R.id.suggestFilm_clearBtn)
ImageView suggestFilm_clearBtn;
@BindView(R.id.suggestFilm_recyclerView)
RecyclerView suggestFilm_recyclerView;
@BindView(R.id.suggestFilm_recyclerViewProgress)
ProgressBar suggestFilm_recyclerViewProgress;
@BindView(R.id.suggestFilm_noDataText)
TextView suggestFilm_noDataText;
@BindView(R.id.newsPageLoadLay)
RelativeLayout newsPageLoadLay;
@BindView(R.id.suggestFilm_recyclerViewSendUser)
RecyclerView suggestFilm_recyclerViewSendUser;
@BindView(R.id.suggestFilm_buttonsSendCard)
CardView suggestFilm_buttonsSendCard;
private Context context;
private SuggestFilmAdapter suggestFilmAdapter;
private List<Result> model = new ArrayList<>();
private ArrayList<SuggestFilmAddUser> suggestFilmAddUserList = new ArrayList<>();
private SuggestFilmUserAdapter suggestFilmUserAdapter;
private InterfaceApi api;
private SharedPrefrencesHandler prefrencesHandler;
private String token;
private GridLayoutManager gridLayoutManager;
private LinearLayoutManager linearLayoutManager;
private List<Integer> usersListSend = new ArrayList<>();
private SuggestFilmAddUser suggestFilmAddUser;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_suggest_film);
//Initialize
ButterKnife.bind(this);
context = this;
prefrencesHandler = new SharedPrefrencesHandler(context);
api = ApiClient.getClient().create(InterfaceApi.class);
suggestFilmAdapter = new SuggestFilmAdapter(context, model, this);
gridLayoutManager = new GridLayoutManager(context, 3);
linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
//Get token
token = prefrencesHandler.getFromShared(SharedPrefrencesKeys.TOKEN.name());
//Set toolbar title
toolbarTitleTxt.setText(context.getResources().getString(R.string.SuggestToFollowers));
//Init followers recyclerView
suggestFilm_recyclerView.setLayoutManager(gridLayoutManager);
suggestFilm_recyclerView.setHasFixedSize(true);
//Init send user recyclerView
suggestFilm_recyclerViewSendUser.setLayoutManager(linearLayoutManager);
suggestFilm_recyclerViewSendUser.setHasFixedSize(true);
//Init Send user adapter
suggestFilmUserAdapter = new SuggestFilmUserAdapter(context, suggestFilmAddUserList, this);
suggestFilm_recyclerViewSendUser.setAdapter(suggestFilmUserAdapter);
//Load more
newsPageLoadLay.setVisibility(View.GONE);
suggestFilm_recyclerView.setOnScrollListener(new EndlessRecyclerGridPage1(gridLayoutManager) {
@Override
public void onLoadMore(int current_page) {
newsPageLoadLay.setVisibility(View.VISIBLE);
Call<SeriesWhoWatchedResponse> call = api.getSuggestFilmUsers(token, filmSendData("", 10, current_page));
call.enqueue(new Callback<SeriesWhoWatchedResponse>() {
@Override
public void onResponse(Call<SeriesWhoWatchedResponse> call, Response<SeriesWhoWatchedResponse> response) {
if (response.body().getData() != null && response.body().getStatusCode() != 401
&& response.body().getStatusCode() != 402) {
if (response.body().getData().getResult().size() > 0) {
suggestFilmAdapter.addNewItem(response.body().getData().getResult());
//Gone no explore
newsPageLoadLay.setVisibility(View.GONE);
}
} else {
prefrencesHandler.remove(SharedPrefrencesKeys.TOKEN.name());
startActivity(new Intent(context, LoginActivity.class));
}
newsPageLoadLay.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<SeriesWhoWatchedResponse> call, Throwable t) {
newsPageLoadLay.setVisibility(View.GONE);
}
});
}
});
//Get user data
getUserData("", 1);
}
private void getUserData(String search, int page) {
suggestFilm_recyclerViewProgress.setVisibility(View.VISIBLE);
Call<SeriesWhoWatchedResponse> call = api.getSuggestFilmUsers(token, filmSendData(search, 10, page));
call.enqueue(new Callback<SeriesWhoWatchedResponse>() {
@Override
public void onResponse(Call<SeriesWhoWatchedResponse> call, Response<SeriesWhoWatchedResponse> response) {
if (response.body().getData() != null) {
if (response.body().getData().getResult().size() > 0) {
model.clear();
model.addAll(response.body().getData().getResult());
suggestFilmAdapter.notifyDataSetChanged();
suggestFilm_recyclerView.setAdapter(suggestFilmAdapter);
suggestFilm_noDataText.setText("");
} else {
model.clear();
suggestFilmAdapter.notifyDataSetChanged();
suggestFilm_recyclerView.setAdapter(suggestFilmAdapter);
suggestFilm_noDataText.setText(context.getResources().getString(R.string.noFollowersYet));
}
}
suggestFilm_recyclerViewProgress.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<SeriesWhoWatchedResponse> call, Throwable t) {
suggestFilm_recyclerViewProgress.setVisibility(View.GONE);
}
});
}
private SuggestFilmSendData filmSendData(String search, int size, int page) {
SuggestFilmSendData sendData = new SuggestFilmSendData();
sendData.setKeyword(search);
sendData.setPageIndex(page);
sendData.setPageSize(size);
return sendData;
}
@Override
public void onSend(int Id, String name, String image) {
suggestFilmAddUser = new SuggestFilmAddUser();
suggestFilmAddUser.setId(Id);
suggestFilmAddUser.setName(name);
suggestFilmAddUser.setImage(image);
//Add to list only once item
for (SuggestFilmAddUser idList : suggestFilmAddUserList) {
if (idList.getId() == suggestFilmAddUser.getId()) {
return;
}
}
suggestFilmAddUserList.add(suggestFilmAddUser);
if (suggestFilmAddUserList.size() > 0) {
suggestFilm_buttonsSendCard.setCardBackgroundColor(ContextCompat.getColor(context, R.color.colorAccent));
suggestFilm_buttonsSendCard.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getSuggestList();
}
});
}
suggestFilmUserAdapter.notifyItemInserted(suggestFilmAddUserList.size() - 1);
suggestFilm_recyclerViewSendUser.setVisibility(View.VISIBLE);
for (SuggestFilmAddUser suggest : suggestFilmAddUserList) {
if (suggest.getId() == suggestFilmAddUser.getId()) {
Log.e("SuggestLog", suggest.getId() + "");
usersListSend.add(suggest.getId());
return;
}
}
}
@Override
public void onDelete(int Id) {
if (usersListSend.size() > 0) {
usersListSend.remove(Id);
}
Toast.makeText(context, "" + Id, Toast.LENGTH_SHORT).show();
}
private void getSuggestList() {
for (SuggestFilmAddUser suggest : suggestFilmAddUserList) {
if (suggest.getId() == suggestFilmAddUser.getId()) {
Toast.makeText(context, "" + usersListSend, Toast.LENGTH_SHORT).show();
return;
}
}
}
public class SuggestFilmAdapter extends RecyclerView.Adapter<SuggestFilmAdapter.ViewHolder> {
private Context context;
private List<Result> model;
private SuggestedListener suggestedListener;
public SuggestFilmAdapter(Context context, List<Result> model, SuggestedListener suggestedListener) {
this.context = context;
this.model = model;
this.suggestedListener = suggestedListener;
}
@Override
public SuggestFilmAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_suggest_film_users_followers, parent, false);
return new SuggestFilmAdapter.ViewHolder(view);
}
@Override
public void onBindViewHolder(final SuggestFilmAdapter.ViewHolder holder, final int position) {
//Name
holder.row_suggestFilmProfileName.setText(model.get(position).getName());
//Image
Glide.with(context)
.load(model.get(position).getImageUrl())
.asBitmap()
.placeholder(R.drawable.default_image)
.diskCacheStrategy(DiskCacheStrategy.SOURCE)
.override(300, 300)
.into(new BitmapImageViewTarget(holder.row_suggestFilmProfileImage) {
@Override
protected void setResource(Bitmap resource) {
if (context == null) return;
RoundedBitmapDrawable circularBitmapDrawable =
RoundedBitmapDrawableFactory.create(context.getResources(), resource);
circularBitmapDrawable.setCircular(true);
holder.row_suggestFilmProfileImage.setImageDrawable(circularBitmapDrawable);
}
});
//Is Mutual
if (model.get(position).getIsMutual()) {
holder.row_suggestFilmIsOk.setVisibility(View.VISIBLE);
} else {
holder.row_suggestFilmIsOk.setVisibility(View.GONE);
}
holder.row_suggestedLay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
suggestedListener.onSend(model.get(position).getUserId(),
model.get(position).getName(),
model.get(position).getImageUrl());
}
});
}
@Override
public int getItemCount() {
return model.size();
}
public void addNewItem(List<Result> newContent) {
int start = this.model.size();
int end = newContent.size();
model.addAll(newContent);
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private ImageView row_suggestFilmProfileImage, row_suggestFilmIsOk;
private TextView row_suggestFilmProfileName;
private RelativeLayout row_suggestedLay;
public ViewHolder(View itemView) {
super(itemView);
row_suggestFilmProfileImage = (ImageView) itemView.findViewById(R.id.row_suggestFilmProfileImage);
row_suggestFilmIsOk = (ImageView) itemView.findViewById(R.id.row_suggestFilmIsOk);
row_suggestFilmProfileName = (TextView) itemView.findViewById(R.id.row_suggestFilmProfileName);
row_suggestedLay = (RelativeLayout) itemView.findViewById(R.id.row_suggestedLay);
}
}
}
在onDelete中显示此行的错误:
public class SuggestFilmUserAdapter extends RecyclerView.Adapter<SuggestFilmUserAdapter.ViewHolder> {
private Context context;
private ArrayList<SuggestFilmAddUser> model;
private SuggestedDeleteListener deleteListener;
public SuggestFilmUserAdapter(Context context, ArrayList<SuggestFilmAddUser> model, SuggestedDeleteListener deleteListener) {
this.context = context;
this.model = model;
this.deleteListener = deleteListener;
}
@Override
public SuggestFilmUserAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_suggest_film_users_add, parent, false);
return new SuggestFilmUserAdapter.ViewHolder(view);
}
@Override
public void onBindViewHolder(final SuggestFilmUserAdapter.ViewHolder holder, final int position) {
//Name
holder.rowSuggestAddUser_name.setText(model.get(position).getName());
//Image
Glide.with(context)
.load(model.get(position).getImage())
.asBitmap()
.placeholder(R.drawable.default_image)
.diskCacheStrategy(DiskCacheStrategy.SOURCE)
.override(300, 300)
.into(new BitmapImageViewTarget(holder.rowSuggestAddUser_image) {
@Override
protected void setResource(Bitmap resource) {
if (context == null) return;
RoundedBitmapDrawable circularBitmapDrawable =
RoundedBitmapDrawableFactory.create(context.getResources(), resource);
circularBitmapDrawable.setCircular(true);
holder.rowSuggestAddUser_image.setImageDrawable(circularBitmapDrawable);
}
});
//Cancel btn
holder.rowSuggestAddUser_cancelImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
deleteItem(position);
deleteListener.onDelete(model.get(position).getId());
}
});
}
private void deleteItem(int position) {
model.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, model.size());
}
@Override
public int getItemCount() {
return model.size();
}
public void addNewItem(ArrayList<SuggestFilmAddUser> newContent) {
int start = this.model.size();
int end = newContent.size();
model.addAll(newContent);
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private ImageView rowSuggestAddUser_image, rowSuggestAddUser_cancelImage;
private TextView rowSuggestAddUser_name;
private RelativeLayout rowSuggestAddUser_lay;
public ViewHolder(View itemView) {
super(itemView);
rowSuggestAddUser_image = (ImageView) itemView.findViewById(R.id.rowSuggestAddUser_image);
rowSuggestAddUser_cancelImage = (ImageView) itemView.findViewById(R.id.rowSuggestAddUser_cancelImage);
rowSuggestAddUser_name = (TextView) itemView.findViewById(R.id.rowSuggestAddUser_name);
rowSuggestAddUser_lay = (RelativeLayout) itemView.findViewById(R.id.rowSuggestAddUser_lay);
}
}
}
FATAL EXCEPTION: main
Process: com.app.test, PID: 28516
java.lang.IndexOutOfBoundsException: Invalid index 18, size is 2
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.remove(ArrayList.java:403)
at com.app.test.Activities.SuggestFilmActivity.onDelete(SuggestFilmActivity.java:222)
at com.app.test.Adapters.SuggestFilm.SuggestFilmUserAdapter$2.onClick(SuggestFilmUserAdapter.java:76)
at android.view.View.performClick(View.java:4764)
at android.view.View$PerformClick.run(View.java:19844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5349)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
usersListSend.remove(Id);
请帮帮我,我是业余爱好者,真的需要这个帮助。请谢谢,最简单的解决方案是将您的Id
存储为String
在ArrayList
中,但我建议您根据异常消息阅读更多关于和的信息:
java.lang.IndexOutOfBoundsException:索引18无效,大小为2
位于java.util.ArrayList.ThrowindexOutfBoundsException(ArrayList.java:255)
在java.util.ArrayList.remove处(ArrayList.java:403)
位于com.app.test.Activities.SuggestFilmActivity.onDelete(SuggestFilmActivity.java:222)
您正在删除ArrayList中索引为18、大小为2的元素。这个异常发生在第222行SuggestFilmActivity类中的onDelete方法中。因此,根据您的代码,我们有:
public void onDelete(int Id) {
if (usersListSend.size() > 0) {
usersListSend.remove(Id);
}
Toast.makeText(context, "" + Id, Toast.LENGTH_SHORT).show();
}
要解决此问题,我建议执行以下操作:
public void onDelete(int id) {
if (id > -1 && id < usersListSend.size()) {
usersListSend.remove(id);
}
Toast.makeText(context, "" + id, Toast.LENGTH_SHORT).show();
}
对于这一点:
//Cancel btn
holder.rowSuggestAddUser_cancelImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int id = model.get(position).getId();
deleteItem(position);
deleteListener.onDelete(id);
}
});
并修改此方法:
private void deleteItem(int position) {
model.remove(position);
notifyItemRemoved(position);
//notifyItemRangeChanged(position, model.size()); // you notified already and no need to do it again I think
}
通过方法void onDelete(int-ID)中SuggestFilmActivity类中的ID删除SuggestFilmAddUser:
将int替换为整数
public void onDelete(Integer Id) {
if (usersListSend.size() > 0) {
usersListSend.remove(Id);
}
Toast.makeText(context, "" + Id, Toast.LENGTH_SHORT).show(); }
错误显示为IndexOutOfBounds
,因此您显然给出了一个错误的索引值,因此OnBindViewHolder
中给定的位置肯定不是您要查找的位置@JoachimHuet,你能帮我修复这个错误吗?求你了,我的兄弟。真的需要你的帮助为什么传递ID来代替位置deleteListener.onDelete(model.get(position.getId())@ArbazRizvi,我想当用户单击deleteAdapter时,从这个列表中删除用户。为此,我用接口发送ID。你能帮我吗?usersListSend.remove(Id);这是通行证而不是身份证。你能帮我查一下密码吗?请我是业余爱好者,真的需要你的帮助。请回答这个错误。你应该读一下,你能解释一下为什么ans是错误的吗??我会非常感谢你的。。。。首先,您不必将int原语转换为包装对象整数,编译器将执行取消装箱和自动装箱。因此,List=newarraylist();增加第(1)款;增加(2);没关系。其次,如果您查看列表接口的源代码,您将看到声明如下的remove方法:E remove(int index);第三,您的代码没有解决这个问题,还需要查看重载方法:booleanremove(objecto);我建议你做个实验。创建任何类,比如消息。创建消息列表:list messages=new ArrayList();。将多个值添加到消息列表中。并尝试从该列表中删除任何项:messages.remove(1);删除(Integer.valueOf(1));看看结果!您将得到答案,为什么您的解决方案是错误的!嘿,你在这里吗,我亲爱的朋友?如果你在这里,请告诉我。请谢谢如果你看到这个消息,请回答我你的问题是什么?我将尝试回答他们我的朋友你看到我的消息了吗?嘿,我的朋友,你的回答帮助我,但告诉我奇怪的错误!你能用TeamViewer连接到我的电脑上看吗?请
@Override
public void onDelete(int Id) {
if (usersListSend.size() > 0) usersListSend.remove(Integer.valueOf(Id)); // removing by Integer value not index!
Toast.makeText(context, "" + Id, Toast.LENGTH_SHORT).show();
}
public void onDelete(Integer Id) {
if (usersListSend.size() > 0) {
usersListSend.remove(Id);
}
Toast.makeText(context, "" + Id, Toast.LENGTH_SHORT).show(); }