I have checked with this link but there its mentioned about long clicks. but I am facing this after clicking on button of custom dialog. I have pasted my code over here. can anyone help me to avoid this error.
  ibtnCancel.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.w("DemoDvicetracker", etConfirmPassword
                .getText().toString());
            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(
                etConfirmPassword.getWindowToken(), 0);
            passwordPopup.dismiss();
        }
        });
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rel"
android:layout_width="fill_parent"
android:layout_height="200dp"
android:background="@drawable/popup_bg" >
<TextView
    android:id="@+id/txt_enter_pwd"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:text="@string/enter_pwd"
    android:textSize="24sp"
    android:textColor="@android:color/black" />
<EditText
    android:id="@+id/et_password"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/txt_enter_pwd"
    android:hint="@string/pwd" 
    android:background="@drawable/popup_textfeild"
    android:layout_marginTop="30dp"
    android:layout_marginLeft="15dp"
    android:layout_marginRight="15dp"
    android:inputType="textPassword"/>
<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="60dip"
    android:layout_alignParentBottom="true"
    android:layout_below="@+id/et_password"
    android:gravity="bottom"
    android:orientation="horizontal" >
    <ImageButton
        android:id="@+id/ibtn_dialog_cancel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@drawable/popup_cancel_selector" 
        android:contentDescription="@string/cancel"/>
    <ImageButton
        android:id="@+id/ibtn_dialog_submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="0dp"
        android:layout_weight="1"
        android:background="@drawable/popup_submit_selector" 
        android:contentDescription="@string/submit"/>
</LinearLayout>
 
     
     
     
    
http://stackoverflow.com/questions/23016155/senduseractionevent-mview-null-on-samsung-tab3/40619021#40619021 – A.J Nov 15 '16 at 20:26