【ANDROID STUDIO】AsyncTask

	<?xml version="1.0" encoding="utf-8"?>
	<androidx.constraintlayout.widget.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=".MainActivity">
	<Button android:id="@+id/buttonStart"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Start"
	android:onClick="start"
	app:layout_constraintBottom_toBottomOf="parent"
	app:layout_constraintLeft_toLeftOf="parent"
	app:layout_constraintRight_toRightOf="parent"
	app:layout_constraintTop_toTopOf="parent" />
	</androidx.constraintlayout.widget.ConstraintLayout>

view raw activity_main.xml hosted with ❤ by GitHub

	package com.example.asyncetask;
	import androidx.appcompat.app.AppCompatActivity;
	import android.content.Context;
	import android.os.AsyncTask;
	import android.os.Bundle;
	import android.view.View;
	import android.widget.Button;
	import android.widget.Toast;
	public class MainActivity extends AppCompatActivity {
	Button mButtonStart;
	private class CountingTask extends AsyncTask<Integer, Integer, Integer> {
	@Override
	protected Integer doInBackground(Integer... params) {
	int count = params[0];
	for (int x = 0; x < count; x++) {
	try {
	Thread.sleep(1000);
	} catch (InterruptedException e) {
	e.printStackTrace();
	}
	}
	return count;
	}
	@Override
	protected void onPostExecute(Integer returnVal) {
	super.onPostExecute(returnVal);
	Context context = getApplicationContext();
	CharSequence text = "Start again!";
	int duration = Toast.LENGTH_SHORT;
	Toast toast = Toast.makeText(context, text, duration);
	toast.show();
	mButtonStart.setEnabled(true);
	}
	}
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	mButtonStart = findViewById(R.id.buttonStart);
	}
	public void start(View view) {
	mButtonStart.setEnabled(false);
	new CountingTask().execute(10);
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub