kotlinでandroidのtextdrag

概要

TextViewを長押しでドラッグする

MainActivity.kt

import android.os.Build
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.annotation.RequiresApi
import android.view.View

class MainActivity : AppCompatActivity() , View.OnLongClickListener {
    lateinit var  vi : View
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        vi = findViewById(R.id.text)
        vi.setOnLongClickListener(this)
    }
    @RequiresApi(Build.VERSION_CODES.N)
    override  fun onLongClick(v : View): Boolean {
        v.startDrag(null, View.DragShadowBuilder(v), v, 2)
        return true;
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.nimani.drag.MainActivity">

    <TextView
        android:id="@+id/text"
        android:layout_width="121dp"
        android:layout_height="66dp"
        android:text="Hello World!"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:layout_editor_absoluteX="109dp" />

</android.support.constraint.ConstraintLayout>

それだけ