Java tutorial
/*** Copyright (c) 2015 CommonsWare, LLC Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. Covered in detail in the book _The Busy Coder's Guide to Android Development_ https://commonsware.com/Android */ package com.commonsware.android.andshooter; import android.app.Notification; import android.app.PendingIntent; import android.app.Service; import android.content.Intent; import android.hardware.display.DisplayManager; import android.hardware.display.VirtualDisplay; import android.media.AudioManager; import android.media.MediaScannerConnection; import android.media.ToneGenerator; import android.media.projection.MediaProjection; import android.media.projection.MediaProjectionManager; import android.os.Handler; import android.os.HandlerThread; import android.os.IBinder; import android.support.annotation.Nullable; import android.support.v4.app.NotificationCompat; import android.util.Log; import android.view.WindowManager; import java.io.File; import java.io.FileOutputStream; public class ScreenshotService extends Service { private static final int NOTIFY_ID = 9906; static final String EXTRA_RESULT_CODE = "resultCode"; static final String EXTRA_RESULT_INTENT = "resultIntent"; static final String ACTION_RECORD = BuildConfig.APPLICATION_ID + ".RECORD"; static final String ACTION_SHUTDOWN = BuildConfig.APPLICATION_ID + ".SHUTDOWN"; static final int VIRT_DISPLAY_FLAGS = DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY | DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC; private MediaProjection projection; private VirtualDisplay vdisplay; final private HandlerThread handlerThread = new HandlerThread(getClass().getSimpleName(), android.os.Process.THREAD_PRIORITY_BACKGROUND); private Handler handler; private MediaProjectionManager mgr; private WindowManager wmgr; private ImageTransmogrifier it; private int resultCode; private Intent resultData; final private ToneGenerator beeper = new ToneGenerator(AudioManager.STREAM_NOTIFICATION, 100); @Override public void onCreate() { super.onCreate(); mgr = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE); wmgr = (WindowManager) getSystemService(WINDOW_SERVICE); handlerThread.start(); handler = new Handler(handlerThread.getLooper()); } @Override public int onStartCommand(Intent i, int flags, int startId) { if (i.getAction() == null) { resultCode = i.getIntExtra(EXTRA_RESULT_CODE, 1337); resultData = i.getParcelableExtra(EXTRA_RESULT_INTENT); foregroundify(); } else if (ACTION_RECORD.equals(i.getAction())) { if (resultData != null) { startCapture(); } else { Intent ui = new Intent(this, MainActivity.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(ui); } } else if (ACTION_SHUTDOWN.equals(i.getAction())) { beeper.startTone(ToneGenerator.TONE_PROP_NACK); stopForeground(true); stopSelf(); } return (START_NOT_STICKY); } @Override public void onDestroy() { stopCapture(); super.onDestroy(); } @Nullable @Override public IBinder onBind(Intent intent) { throw new IllegalStateException("Binding not supported. Go away."); } WindowManager getWindowManager() { return (wmgr); } Handler getHandler() { return (handler); } void processImage(final byte[] png) { new Thread() { @Override public void run() { File output = new File(getExternalFilesDir(null), "screenshot.png"); try { FileOutputStream fos = new FileOutputStream(output); fos.write(png); fos.flush(); fos.getFD().sync(); fos.close(); MediaScannerConnection.scanFile(ScreenshotService.this, new String[] { output.getAbsolutePath() }, new String[] { "image/png" }, null); } catch (Exception e) { Log.e(getClass().getSimpleName(), "Exception writing out screenshot", e); } } }.start(); beeper.startTone(ToneGenerator.TONE_PROP_ACK); stopCapture(); } private void stopCapture() { if (projection != null) { projection.stop(); vdisplay.release(); projection = null; } } private void startCapture() { projection = mgr.getMediaProjection(resultCode, resultData); it = new ImageTransmogrifier(this); MediaProjection.Callback cb = new MediaProjection.Callback() { @Override public void onStop() { vdisplay.release(); } }; vdisplay = projection.createVirtualDisplay("andshooter", it.getWidth(), it.getHeight(), getResources().getDisplayMetrics().densityDpi, VIRT_DISPLAY_FLAGS, it.getSurface(), null, handler); projection.registerCallback(cb, handler); } private void foregroundify() { NotificationCompat.Builder b = new NotificationCompat.Builder(this); b.setAutoCancel(true).setDefaults(Notification.DEFAULT_ALL); b.setContentTitle(getString(R.string.app_name)).setSmallIcon(R.mipmap.ic_launcher) .setTicker(getString(R.string.app_name)); b.addAction(R.drawable.ic_record_white_24dp, getString(R.string.notify_record), buildPendingIntent(ACTION_RECORD)); b.addAction(R.drawable.ic_eject_white_24dp, getString(R.string.notify_shutdown), buildPendingIntent(ACTION_SHUTDOWN)); startForeground(NOTIFY_ID, b.build()); } private PendingIntent buildPendingIntent(String action) { Intent i = new Intent(this, getClass()); i.setAction(action); return (PendingIntent.getService(this, 0, i, 0)); } }