Limit EditText to accept signed decimal numbers only, in xml and java

layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:padding="16dp"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/edittext1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="numberSigned|numberDecimal"/>
    <EditText
        android:id="@+id/edittext2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

MainActivity.java

package com.blogspot.android_er.androiddecimalnumberedittext;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.InputType;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

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

        EditText editText1 = (EditText)findViewById(R.id.edittext1);
        EditText editText2 = (EditText)findViewById(R.id.edittext2);
        editText2.setInputType(InputType.TYPE_CLASS_NUMBER
                | InputType.TYPE_NUMBER_FLAG_DECIMAL
                | InputType.TYPE_NUMBER_FLAG_SIGNED);
    }
}