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최근 android studio Arctic Fox 업데이트 이후 2021년 개발된 프로젝트 오류 발생 file - setting - Build, Execution, Depolyment - Build Tools - Gradle - Gradle JDK 11로 변경

long now = System.currentTimeMillis();Date date = new Date(now);SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");String getTime = sdf.format(date);

static class HttpPingAsyncTask extends AsyncTask { @Override protected Boolean doInBackground(String... urls) { try { // HttpURLConnection.setFollowRedirects(false); HttpURLConnection con = (HttpURLConnection) new URL(urls[0]).openConnection(); con.setInstanceFollowRedirects(false); con.setRequestMethod("HEAD"); return (con.getResponseCode() == HttpURLConnection.HTTP_OK); } catch (Exception e) {..

build.gradlecompile 'com.squareup.okhttp3:okhttp:3.2.0'private void sendRegistrationToServer(String token) { OkHttpClient client = new OkHttpClient(); RequestBody body = new FormBody.Builder() .add("Token", token) .build(); //request Request request = new Request.Builder() .url("http://서버주소/") .post(body) .build(); try { client.newCall(request).execute(); } catch (IOException e) { e.printStackTr..

1. MyTask 선언private class MyTask extends TimerTask { public void run() { }} 2. 생성MyTask mytask = new MyTask() 3. timer 실행Timer timer = new Timer();timer.schedule(myTask, milli second); 4. timer 종료timer.cancel();timer = null; * Timer 재사용시 보통 TimerTask is scheduled already 오류가 난다.위와 같이 사용하면 오류가 나지 않는다.

간단히 데이터 저장용 private void writePreference(String dataName, String data){SharedPreferences preferences = getSharedPreferences("TestKey", Activity.MODE_PRIVATE);Editor editor = preferences.edit();editor.clear();editor.putString(dataName, data);editor.commit();}private String readPreference(String dataName){SharedPreferences preferences2 = getSharedPreferences("TestKey", Activity.MODE_PRIVATE); retu..

1. 자신의 애드센스 코드를 ' adsense.html ' 파일로 저장한다. 2. 저장한 파일을 프로젝트 assets 폴더에 저장한다. 3. AndroidManifest.xml 파일에 permission 을 준다. 4. Xml 파일에 WebView를 배치한다. 5. Java 파일에 실행코드를 삽입한다. 출처:http://daeha.egloos.com/1451359

import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.hardware.Camera; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.ImageButton; import android.widget.ImageView; /** * 카메라 샘플 */ public class HelloCamera extends Acti..

1. Set the google apis project -> right mouse button -> Properties -> Android tab -> Google Apis and Android 2. Modify the AndroidManifest.xml 3. Get google api key - start-run-cmd -> keytool -list -keystore debug.keystore -keypass android -storepass android -alias androiddebugkey - copy in colsole and open browser to http://code.google.com/intl/ko/android/maps-api-signup.html ( needs google log..

==> Activity call function public void call() { Intent intent = new Intent(this, Start_Activity.class); startActivity(intent); } ==> Intent file modify in the AndroidManifest.xml