我想在用户 longClicked 选择 RecyclerView 项目时删除项目。 mWebsite 是一个包含两个String值的对象列表。
RecyclerViewAdapter的setOnLongClickListener;
holder.cardView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
Toast.makeText(mContext, "ITEM: "+position, Toast.LENGTH_SHORT).show();
AlertDialog.Builder builder2 = new AlertDialog.Builder(mContext);
builder2.setTitle("Are you sure to delete this item?");
builder2.setMessage("'"+mWebsite.get(position).getWebUrl()+"'");
builder2.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mWebsite.remove(position);
}
});
builder2.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
builder2.setCancelable(true);
builder2.create().show();
return true;
}
});
但是,我收到此错误; (第106行是; mWebsite.remove ......)
at java.util.ArrayList.get(ArrayList.java:310)
at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7225)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
答案 0 :(得分:0)
adapter.remove(项目); adapter.notifyItemRemoved(位置);