スワイプでリサイクルビューアイテムを取り除く

Question

画像のようにリサイクルビューアイテムをスワイプしている間に画像に問題があります。スワイプ要素の下でこのゴミをどのように隠すことができるのか、誰にでも分かりますか？これは私のコードです：

@Override 
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { 
    Bitmap icon; 
    if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE){ 
     View itemView = viewHolder.itemView; 
     float height = (float) itemView.getBottom() - (float) itemView.getTop(); 
     float width = height/3; 

     if(dX < 0){ 
      p.setColor(Color.parseColor("#D32F2F")); 
      RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom()); 
      c.drawRect(background,p); 
      Drawable d = getResources().getDrawable(R.drawable.ic_delete_white_24dp); 
      icon = drawableToBitmap(d); 
      RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width); 
      if(dX < 0){ 
       c.drawBitmap(icon,null,icon_dest,p); 
      } 
     } 
    } 
    super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); 
} 

Answer 1

activity_main.xml 
-------------------- 
<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:context="com.learn2crack.recyclerswipeview.MainActivity"> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/card_recycler_view" 
     android:scrollbars="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"/> 

    <android.support.design.widget.FloatingActionButton 
     android:id="@+id/fab" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom|end" 
     android:layout_margin="@dimen/fab_margin" 
     android:src="@drawable/ic_add" /> 

</android.support.design.widget.CoordinatorLayout> 


------------------------------ 
row_layout.xml 

------------- 


row_layout.xml 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_marginBottom="1dp" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:id="@+id/tv_country" 
     android:layout_marginTop="15dp" 
     android:layout_marginBottom="15dp" 
     android:layout_gravity="center" 
     android:textSize="18sp" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textStyle="bold" /> 

</LinearLayout> 
--------------------------- 

dialog_layout.xml 
---------------------------- 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <EditText 
     android:id="@+id/et_country" 
     android:layout_marginLeft="10dp" 
     android:layout_marginRight="10dp" 
     android:layout_marginTop="10dp" 
     android:layout_marginBottom="10dp" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 
</LinearLayout> 

--------------------------------- 

DataAdapter.java 
-------------------------------- 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 

import java.util.ArrayList; 

public class DataAdapter extends RecyclerView.Adapter { 
    private ArrayList countries; 

    public DataAdapter(ArrayList countries) { 
     this.countries = countries; 
    } 

    @Override 
    public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
     View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_layout, viewGroup, false); 
     return new ViewHolder(view); 
    } 

    @Override 
    public void onBindViewHolder(ViewHolder viewHolder, int i) { 

     viewHolder.tv_country.setText(countries.get(i)); 
    } 

    @Override 
    public int getItemCount() { 
     return countries.size(); 
    } 

    public void addItem(String country) { 
     countries.add(country); 
     notifyItemInserted(countries.size()); 
    } 

    public void removeItem(int position) { 
     countries.remove(position); 
     notifyItemRemoved(position); 
     notifyItemRangeChanged(position, countries.size()); 
    } 
    public class ViewHolder extends RecyclerView.ViewHolder{ 
     TextView tv_country; 
     public ViewHolder(View view) { 
      super(view); 

      tv_country = (TextView)view.findViewById(R.id.tv_country); 
     } 
    } 
} 

--------------------------------------- 


MainActivity.java 
--------------------- 
import android.content.DialogInterface; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.RectF; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.v7.app.AlertDialog; 
import android.support.v7.app.AppCompatActivity; 
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.EditText; 

import java.util.ArrayList; 

public class MainActivity extends AppCompatActivity implements View.OnClickListener{ 

    private ArrayList countries = new ArrayList<>(); 
    private DataAdapter adapter; 
    private RecyclerView recyclerView; 
    private AlertDialog.Builder alertDialog; 
    private EditText et_country; 
    private int edit_position; 
    private View view; 
    private boolean add = false; 
    private Paint p = new Paint(); 

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

     initViews(); 
     initDialog(); 
    } 

    private void initViews(){ 
     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(this); 
     recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view); 
     recyclerView.setHasFixedSize(true); 
     RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext()); 
     recyclerView.setLayoutManager(layoutManager); 
     adapter = new DataAdapter(countries); 
     recyclerView.setAdapter(adapter); 
     countries.add("Australia"); 
     countries.add("India"); 
     countries.add("United States of America"); 
     countries.add("Germany"); 
     countries.add("Russia"); 
     adapter.notifyDataSetChanged(); 
     initSwipe(); 

    } 
    private void initSwipe(){ 
     ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) { 

      @Override 
      public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { 
       return false; 
      } 

      @Override 
      public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { 
       int position = viewHolder.getAdapterPosition(); 

       if (direction == ItemTouchHelper.LEFT){ 
        adapter.removeItem(position); 
       } else { 
        removeView(); 
        edit_position = position; 
        alertDialog.setTitle("Edit Country"); 
        et_country.setText(countries.get(position)); 
        alertDialog.show(); 
       } 
      } 

      @Override 
      public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { 

       Bitmap icon; 
       if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE){ 

        View itemView = viewHolder.itemView; 
        float height = (float) itemView.getBottom() - (float) itemView.getTop(); 
        float width = height/3; 

        if(dX > 0){ 
         p.setColor(Color.parseColor("#388E3C")); 
         RectF background = new RectF((float) itemView.getLeft(), (float) itemView.getTop(), dX,(float) itemView.getBottom()); 
         c.drawRect(background,p); 
         icon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_edit_white); 
         RectF icon_dest = new RectF((float) itemView.getLeft() + width ,(float) itemView.getTop() + width,(float) itemView.getLeft()+ 2*width,(float)itemView.getBottom() - width); 
         c.drawBitmap(icon,null,icon_dest,p); 
        } else { 
         p.setColor(Color.parseColor("#D32F2F")); 
         RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom()); 
         c.drawRect(background,p); 
         icon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_delete_white); 
         RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width); 
         c.drawBitmap(icon,null,icon_dest,p); 
        } 
       } 
       super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); 
      } 
     }; 
     ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback); 
     itemTouchHelper.attachToRecyclerView(recyclerView); 
    } 
    private void removeView(){ 
     if(view.getParent()!=null) { 
      ((ViewGroup) view.getParent()).removeView(view); 
     } 
    } 
    private void initDialog(){ 
     alertDialog = new AlertDialog.Builder(this); 
     view = getLayoutInflater().inflate(R.layout.dialog_layout,null); 
     alertDialog.setView(view); 
     alertDialog.setPositiveButton("Save", new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       if(add){ 
        add =false; 
        adapter.addItem(et_country.getText().toString()); 
        dialog.dismiss(); 
       } else { 
        countries.set(edit_position,et_country.getText().toString()); 
        adapter.notifyDataSetChanged(); 
        dialog.dismiss(); 
       } 

      } 
     }); 
     et_country = (EditText)view.findViewById(R.id.et_country); 
    } 
    @Override 
    public void onClick(View v) { 

     switch (v.getId()){ 
      case R.id.fab: 
       removeView(); 
       add = true; 
       alertDialog.setTitle("Add Country"); 
       et_country.setText(""); 
       alertDialog.show(); 
       break; 
     } 
    } 
}