Question

我遇到很多麻烦，我可以通过搜索找到与我的问题相关的内容，但它们似乎无法解决我的问题，而且我已尽力而为。我似乎无法为我的生活解决这个问题。

所以我有一个应用程序来跟踪大学课程。其中，我有一个按钮，可以将自定义视图持有者添加到RecyclerView。此自定义视图持有者包含两个EditText字段以及CheckBox。现在，当我点击我的按钮“添加课程”时，它将添加这三件事。这很好用。但是，当我在EditText字段中输入任何文本，然后添加另一个课程时，它会删除之前输入EditText字段的所有内容。我试图保存这些内容，非常永久，或者至少在用户删除该视图之前（点击我的“全部删除”按钮或向左滑动）。我虽然遇到了极大的困难。我一直在尝试为每个视图添加一个“TextChangedListener”，但我似乎无法让它工作。我已经尝试制作一个自定义文本监听器并将其添加到我的“onCreateViewHolder”方法中，然后在“onBindViewHolder”方法中设置文本，但这似乎并没有解决我的问题。

我认为我的另一个问题可能与那个问题有关，当我在RecyclerView中有足够的视图向下滚动时，我会在EditText字段中输入文本。然后，当我向下滚动时，我输入的文本将出现在其他EditText字段中。或者如果我检查我的CheckBox，然后向下滚动，那么也将检查其他复选框。这是一些视觉图片。

这是我添加新课程的时候，文字消失了：

这是我的滚动问题：

这也是我的文件。

首先，我的MainActivity.java：

import android.content.ClipData;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RelativeLayout;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ArrayList<ListItems> itemsList = new ArrayList<ListItems>();
    private RecyclerView mRecyclerView;
    private MyRecyclerAdapter adapter;

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

        // For the recycler view.
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.rl);

        // For the addCourse button.
        final Button addCourse = (Button) findViewById(R.id.addCourse);
        addCourse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ListItems.createListItem(itemsList);
                adapter = new MyRecyclerAdapter(MainActivity.this, itemsList);
                mRecyclerView.setAdapter(adapter);
                mRecyclerView.setLayoutManager(linearLayoutManager);
            }
        });

        final Button clearAll = (Button) findViewById(R.id.clearAll);
        clearAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // In order to clear the list.
                adapter.clearAdapter();
            }
        });

        // For the drag and drop/swipe to dismiss.
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(
                new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN,
                        ItemTouchHelper.LEFT) {
                    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                        final int fromPos = viewHolder.getAdapterPosition();
                        final int toPos = target.getAdapterPosition();
                        Collections.swap(itemsList, fromPos, toPos);
                        adapter.notifyItemMoved(fromPos, toPos);
                        return true;
                    }
                    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                       adapter.onItemDismiss(viewHolder.getAdapterPosition());
                    }
                });
        itemTouchHelper.attachToRecyclerView(mRecyclerView);
    } // End of onCreate
} // End of MainActivity

现在，我的适配器：

import android.app.Activity;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.view.LayoutInflater;
import android.widget.CheckBox;
import android.widget.EditText;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class MyRecyclerAdapter extends RecyclerView.Adapter<CustomRowViewHolder> {

     private ArrayList<ListItems> itemsList;
     private Context mContext;
     private int focuseditem = 0;
     String afterTextChanged = "";


    public MyRecyclerAdapter(Context context, ArrayList<ListItems> itemsList){
        this.itemsList = itemsList;
        this.mContext = context;
    }

     @Override
     public CustomRowViewHolder onCreateViewHolder(final ViewGroup viewGroup, int position) {
         View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.new_course_row, null);
         final CustomRowViewHolder holder = new CustomRowViewHolder(v, new CustomTextListener());

         holder.creditsText.setInputType(InputType.TYPE_CLASS_NUMBER);
         holder.checkBox.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 if(holder.checkBox.isChecked()) {
                     holder.courseText.setEnabled(false);
                     holder.courseText.setFocusable(false);
                     holder.courseText.setInputType(InputType.TYPE_NULL);
                     holder.creditsText.setEnabled(false);
                     holder.creditsText.setFocusable(false);
                     holder.creditsText.setInputType(InputType.TYPE_NULL);
                 } else {
                     holder.courseText.setEnabled(true);
                     holder.courseText.setFocusable(true);
                     holder.courseText.setFocusableInTouchMode(true);
                     holder.courseText.setInputType(InputType.TYPE_CLASS_TEXT);
                     holder.creditsText.setEnabled(true);
                     holder.creditsText.setFocusable(true);
                     holder.creditsText.setFocusableInTouchMode(true);
                     holder.creditsText.setInputType(InputType.TYPE_CLASS_NUMBER);
                 } // End if else
             }
         });
         return holder;
     } // End of onCreateViewHolder

     @Override
     public void onBindViewHolder(final CustomRowViewHolder customRowViewHolder, int position) {
         ListItems listItem = itemsList.get(position);
         customRowViewHolder.itemView.setSelected(focuseditem == position);
         customRowViewHolder.getLayoutPosition();
         customRowViewHolder.customTextListener.updatePosition(position, customRowViewHolder);
         customRowViewHolder.courseText.setText(itemsList.get(position).getCourse());
     } // End of onBindViewHolder

     public void clearAdapter() {
         itemsList.clear();
         notifyDataSetChanged();
     } // End of clearAdapter

     public int getItemCount() {
         return(null != itemsList ? itemsList.size() : 0);
     } // End of getItemCount

     public void onItemDismiss(int position) {
         itemsList.remove(position);
         notifyItemRemoved(position);
         notifyItemRangeChanged(position, itemsList.size());
     } // End of onItemDismiss

     public void onItemMove(List<ListItems> itemsList, int fromPosition, int toPosition) {
         Collections.swap(itemsList, fromPosition, toPosition);
         notifyItemMoved(fromPosition, toPosition);
     } // End of onItemMove

} // End of MyRecyclerAdapter

/**
 * Created by Thomas on 6/3/2016.
 */
class CustomTextListener implements TextWatcher {
    private int position;
    private CustomRowViewHolder customRowViewHolder;

    public void updatePosition(int position, CustomRowViewHolder customRowViewHolder) {
        this.position = position;
        this.customRowViewHolder = customRowViewHolder;
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public void afterTextChanged(Editable s) {
        customRowViewHolder.courseText.setText(s.toString());
    }
}

我的“CustomRowViewHolder.java”：

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;

public class CustomRowViewHolder extends RecyclerView.ViewHolder{

    protected EditText courseText;
    protected EditText creditsText;
    protected CheckBox checkBox;
    protected RelativeLayout relativeLayout;
    protected CustomTextListener customTextListener;

    public CustomRowViewHolder(View view, CustomTextListener customTextListener) {
        super(view);
        this.customTextListener = customTextListener;
        this.courseText = (EditText) view.findViewById(R.id.course);
        this.creditsText = (EditText) view.findViewById(R.id.credits);
        this.checkBox = (CheckBox) view.findViewById(R.id.complete);
        this.relativeLayout = (RelativeLayout) view.findViewById(R.id.relLayout);

        view.setClickable(true);
    }
}

最后，我的“ListItems.java”：

import java.util.ArrayList;

public class ListItems {
    private String course;
    private String credits;
    private Boolean complete;

    public ListItems(String mCourse, String mCredits, Boolean mComplete) {
        course = mCourse;
        credits = mCredits;
        complete = mComplete;
    }

    public String getCourse() {
        return course;
    }

    public void setCourse(String course) {
        this.course = course;
    }

    public String getCredits() {
        return credits;
    }

    public void setCredits(String credits) {
        this.credits = credits;
    }

    public Boolean getIsComplete() {
        return complete;
    }

    public void setIsComplete(Boolean complete) {
        this.complete = complete;
    }

    public static ArrayList<ListItems> createListItem(ArrayList<ListItems> itemsList) {
        itemsList.add(new ListItems(null, null, false));
        return itemsList;
    } // End of createListItem

    public static ArrayList<ListItems> removeListItem(ArrayList<ListItems> itemsList) {
        if (itemsList.size() == 0) {
            return itemsList;
        } else {
            itemsList.remove(0);
        } // End if

        return itemsList;
    } // End of removeListItem
} // End of ListItems

提前感谢您的任何帮助！非常感谢，因为我长期以来一直坚持这个问题！

Answer 1

我遇到了类似的问题......您可以尝试使用ediText中的文本在ListItems中添加一个字段（如果需要，可以使用其他列表）。重要的是要引用先前插入的文本和listItem。让我们说，检查是否完成，获取文本并将其设置为ListItem中的该字段。

然后，在适配器中，使用该字段的值将setText设置为editText。

Answer 2

向您的回收商视图添加方法以插入新项目。或删除它们。像那样

public void addItem(ListItems object)
{
    itemsList.add(object);
    int pos = itemsList.indexOf(object);
    notifyItemInserted(pos);
}

然后在添加课程按钮中单击事件调用添加项目方法：

 // For the recycler view.
    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    final LinearLayoutManager linearLayoutManager = new  LinearLayoutManager(this);
    final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.rl);

         List<ListItems> itemsList = new ArrayList<>();
        adapter = new MyRecyclerAdapter(MainActivity.this, itemsList);
        mRecyclerView.setAdapter(adapter);
        mRecyclerView.setLayoutManager(linearLayoutManager);

    // For the addCourse button.
    final Button addCourse = (Button) findViewById(R.id.addCourse);
    addCourse.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mRecyclerView.getAdapter().addItem(new ListItems(null, null, false));

        }
    });

对于你的第二个问题，只需保存相关ListItem中的复选框状态，然后将其设置为onBindViewHolder方法中的复选框：像这样：

@Override
 public void onBindViewHolder(final CustomRowViewHolder customRowViewHolder, int position) {
     ListItems listItem = itemsList.get(position);
     customRowViewHolder.itemView.setSelected(focuseditem == position);
     customRowViewHolder.getLayoutPosition();
     customRowViewHolder.customTextListener.updatePosition(position, customRowViewHolder);
     customRowViewHolder.courseText.setText(itemsList.get(position).getCourse());

    // just set listener to check box.
  customRowViewHolder.checkBox.setChecked(  itemsList.get(position).getIsComplete());
initEditText(customRowViewHolder,itemsList.get(position).getIsComplete());
    customRowViewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
           itemsList.get(position).setIsComplete(b);

 // for retrieve eidtTexts state
  initEditText(customRowViewHolder,b);
    });



     //for retrieve text 
     customRowViewHolder.courseText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            itemsList.get(position).setCourse(editable.toString());
        }
    });

customRowViewHolder.creditsText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            itemsList.get(position).setCredits(editable.toString());
        }
    });

 customRowViewHolder.courseText.setText( itemsList.get(position).getCourse());
 customRowViewHolder.creditsText.setText( itemsList.get(position).getCredits());

 } // End of onBindViewHolder

 private void initEditText(CustomRowViewHolder customRowViewHolder,boolean b) {
    if(b) {
        customRowViewHolder.courseText.setEnabled(false);
        customRowViewHolder.courseText.setFocusable(false);
        customRowViewHolder.courseText.setInputType(InputType.TYPE_NULL);
        customRowViewHolder.creditsText.setEnabled(false);
        customRowViewHolder.creditsText.setFocusable(false);
        customRowViewHolder.creditsText.setInputType(InputType.TYPE_NULL);
    } else {
        customRowViewHolder.courseText.setEnabled(true);
        customRowViewHolder.courseText.setFocusable(true);
        customRowViewHolder.courseText.setFocusableInTouchMode(true);
        customRowViewHolder.courseText.setInputType(InputType.TYPE_CLASS_TEXT);
        customRowViewHolder.creditsText.setEnabled(true);
        customRowViewHolder.creditsText.setFocusable(true);
        customRowViewHolder.creditsText.setFocusableInTouchMode(true);
        customRowViewHolder.creditsText.setInputType(InputType.TYPE_CLASS_NUMBER);
    } // End if else
}

RecyclerView中的EditText内容消失并跳跃

2 个答案: