我已经为动态recyclelerView实现了FirebaseRecyclerAdapter，当我尝试从列表中删除项目时，最初错误索引的项目将被删除，删除更多项目后，我得到IndexOutOfBoundsException 。我已经尝试了我发现的所有解决方案，可以看作是populateViewHolder()方法中的注释。请你，如果你必须投票，至少给出一个正确的答案，然后投票，因为我已经尝试了所有可能的解决方案。下面我发布我的代码。请看看。
检查delete.setOnClickListener()：
adapter = new FirebaseRecyclerAdapter<Slc, viewHolder>(
Slc.class,
R.layout.single_slc_row,
viewHolder.class,
FirebaseDatabase.getInstance().getReference().child("DCU")) {
@Override
protected void populateViewHolder(final viewHolder viewHolder, final Slc model, final int position)
{
//expand collapse
viewHolder.vis.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
// ViewAnimationsUtils.expand(viewHolder.inv);
viewHolder.collapse.setVisibility(View.VISIBLE);
viewHolder.inv.setVisibility(View.VISIBLE);
}
});
viewHolder.collapse.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
// ViewAnimationsUtils.collapse(inv);
viewHolder.inv.setVisibility(View.GONE);
viewHolder.collapse.setVisibility(View.GONE);
}
});
String s=adapter.getRef(position).getKey();
viewHolder.name.setText(s);
//dimming get
viewHolder.dimming.setProgress(model.getPercentage());
//on off get
if(model.getON_OFF()==1)
{
viewHolder.onOff.setChecked(true);
}
else if(model.getON_OFF()==0)
{
viewHolder.onOff.setChecked(false);
}
//dimming set
//viewHolder.dimming.incrementProgressBy(10);
viewHolder.showProgress.setText( viewHolder.dimming.getProgress()+"%");
viewHolder.dimming.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
if(position!=RecyclerView.NO_POSITION)
{
if(seekBar.isShown() && fromUser)
{
progress= (progress/10)*10;
adapter.getRef(position).child("Percentage").setValue(progress);
viewHolder.showProgress.setText(progress+"%");
}
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
viewHolder.onOff.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if(buttonView.isPressed() &&isChecked){
adapter.getRef(position).child("ON_OFF").setValue(1);
}else{
adapter.getRef(position).child("ON_OFF").setValue(0);
}
}
});
viewHolder.delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
final Dialog dialog = new Dialog(myContext);
dialog.setTitle("Delete Slc?");
dialog.setContentView(R.layout.delete_slc);
dialog.setCancelable(false);
Window window = dialog.getWindow();
if(window == null) return;
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
lp.copyFrom(dialog.getWindow().getAttributes());
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
lp.gravity = Gravity.CENTER;
dialog.getWindow().setAttributes(lp);
TextView delete = (TextView)dialog.findViewById(R.id.deleteSlc);
final String key= adapter.getRef(position).getKey();
delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
// int pos = viewHolder.getAdapterPosition();
ref.child(key).setValue(null);
// int selectedItems = position;
// for (int i = selectedItems; i >= selectedItems; i--) {
// adapter.getRef(i).removeValue();
adapter.notifyItemRemoved(position);
// }
// adapter.getRef(position).removeValue();
//
// adapter.notifyItemRemoved(position);
// adapter.notifyDataSetChanged();
dialog.dismiss();
}
});
TextView dialogButton = (TextView) dialog.findViewById(R.id.canceld);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
dialog.dismiss();
}
});
dialog.show();
}
});
}
};
slcList.setAdapter(adapter);
删除某些项目后我得到的例外：
java.lang.IndexOutOfBoundsException: Invalid index 2, size is 2
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.firebase.ui.database.FirebaseArray.getItem(FirebaseArray.java:52)
at com.firebase.ui.database.FirebaseRecyclerAdapter.getRef(FirebaseRecyclerAdapter.java:150)
答案 0 :(得分：4)
错误是由函数内部position对象的使用引起的，而不是直接在populateViewHolder下。就像在这一个:(但不限于）
protected void populateViewHolder(final viewHolder viewHolder, final Slc model, final int position) {
// here position object is valid
...
viewHolder.dimming.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged( ... ) {
// but here, position object is likely to be incorrect
// especially when you add/remove item of list
}
...
}
解决方案就是将position以外的所有populateViewHolder个对象替换为viewHolder.getAdapterPosition()。
注意：我会从我的评论中复制它，以防其他人寻求答案并错过评论