[챕터 2-8-2] 동기화

결과화면

 

실행버튼 클릭 시 프로그레스바가 점차적으로 변화 (좌측에서 우측으로)

 

 

 

 

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프로젝트명 : MyAsyncTask

 

 

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프로그레스바 : 레이아웃 마진 하단 30dp

 

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MainActivity.java

 

package org.minokuma.myasynctask;

import androidx.appcompat.app.AppCompatActivity;

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

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

        ProgressBar progressBar = findViewById(R.id.progressBar);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
    }

    class BackgroundTask extends AsyncTask<Integer, Integer, Integer> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected void onPostExecute(Integer integer) {
            super.onPostExecute(integer);
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
        }

        @Override
        protected Integer doInBackground(Integer... integers) {
            return null;
        }
    }

}

 

 

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MainActivity.java

 

package org.minokuma.myasynctask;

import androidx.appcompat.app.AppCompatActivity;

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

    ProgressBar progressBar;
    int value = 0;

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

        progressBar = findViewById(R.id.progressBar);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                BackgroundTask backgroundTask = new BackgroundTask();
                backgroundTask.execute();
            }
        });
    }

    class BackgroundTask extends AsyncTask<Integer, Integer, Integer> {

        @Override
        protected void onPreExecute() {
            value = 0;
            progressBar.setProgress(value);
        }

        @Override
        protected void onPostExecute(Integer integer) {
            progressBar.setProgress(0);
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            progressBar.setProgress(values[0].intValue());
        }

        @Override
        protected Integer doInBackground(Integer... integers) {
            while (!isCancelled()){
                value += 1;
                if(value >= 100){
                    break;
                }
                publishProgress(value);

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            return value;
        }
    }

}