Java tutorial
/* * Copyright (C) The Android Open Source Project * * 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. */ package com.s8launch.cheil.facetracker; import android.Manifest; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.os.Environment; import android.support.design.widget.Snackbar; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Toast; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GoogleApiAvailability; import com.google.android.gms.vision.CameraSource; import com.google.android.gms.vision.MultiDetector; import com.google.android.gms.vision.MultiProcessor; import com.google.android.gms.vision.face.FaceDetector; import com.s8launch.cheil.facetracker.R; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; /** * Activity for the multi-tracker app. This app detects faces and barcodes with the rear facing * camera, and draws overlay graphics to indicate the position, size, and ID of each face and * barcode. */ public final class MultiTrackerActivity extends AppCompatActivity implements CameraSource.PictureCallback { private static final String TAG = "MultiTracker"; private static final int RC_HANDLE_GMS = 9001; // permission request codes need to be < 256 private static final int RC_HANDLE_CAMERA_PERM = 2; private CameraSource mCameraSource = null; private CameraSourcePreview mPreview; public GraphicOverlay mGraphicOverlay; /** * Initializes the UI and creates the detector pipeline. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); getWindow().getDecorView().setSystemUiVisibility( View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY); setContentView(R.layout.main); mPreview = (CameraSourcePreview) findViewById(R.id.preview); mGraphicOverlay = (GraphicOverlay) findViewById(R.id.faceOverlay); // Check for the camera permission before accessing the camera. If the // permission is not granted yet, request permission. int rc = ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA); if (rc == PackageManager.PERMISSION_GRANTED) { createCameraSource(); } else { requestCameraPermission(); } } /** * Handles the requesting of the camera permission. This includes * showing a "Snackbar" message of why the permission is needed then * sending the request. */ private void requestCameraPermission() { Log.w(TAG, "Camera permission is not granted. Requesting permission"); final String[] permissions = new String[] { Manifest.permission.CAMERA }; if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) { ActivityCompat.requestPermissions(this, permissions, RC_HANDLE_CAMERA_PERM); return; } final Activity thisActivity = this; View.OnClickListener listener = new View.OnClickListener() { @Override public void onClick(View view) { ActivityCompat.requestPermissions(thisActivity, permissions, RC_HANDLE_CAMERA_PERM); } }; Snackbar.make(mGraphicOverlay, R.string.permission_camera_rationale, Snackbar.LENGTH_INDEFINITE) .setAction(R.string.ok, listener).show(); } /** * Creates and starts the camera. Note that this uses a higher resolution in comparison * to other detection examples to enable the barcode detector to detect small barcodes * at long distances. */ private void createCameraSource() { Context context = getApplicationContext(); // A face detector is created to track faces. An associated multi-processor instance // is set to receive the face detection results, track the faces, and maintain graphics for // each face on screen. The factory is used by the multi-processor to create a separate // tracker instance for each face. FaceDetector faceDetector = new FaceDetector.Builder(context) .setClassificationType(FaceDetector.ALL_CLASSIFICATIONS).setTrackingEnabled(true) .setMode(FaceDetector.ACCURATE_MODE).setMinFaceSize(0.0f).build(); FaceTrackerFactory faceFactory = new FaceTrackerFactory(this, mGraphicOverlay); faceDetector.setProcessor(new MultiProcessor.Builder<>(faceFactory).build()); // A multi-detector groups the two detectors together as one detector. All images received // by this detector from the camera will be sent to each of the underlying detectors, which // will each do face and barcode detection, respectively. The detection results from each // are then sent to associated tracker instances which maintain per-item graphics on the // screen. MultiDetector multiDetector = new MultiDetector.Builder().add(faceDetector) // .add(barcodeDetector) .build(); if (!multiDetector.isOperational()) { // Note: The first time that an app using the barcode or face API is installed on a // device, GMS will download a native libraries to the device in order to do detection. // Usually this completes before the app is run for the first time. But if that // download has not yet completed, then the above call will not detect any barcodes // and/or faces. // // isOperational() can be used to check if the required native libraries are currently // available. The detectors will automatically become operational once the library // downloads complete on device. Log.w(TAG, "Detector dependencies are not yet available."); // Check for low storage. If there is low storage, the native library will not be // downloaded, so detection will not become operational. IntentFilter lowstorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW); boolean hasLowStorage = registerReceiver(null, lowstorageFilter) != null; if (hasLowStorage) { Toast.makeText(this, R.string.low_storage_error, Toast.LENGTH_LONG).show(); Log.w(TAG, getString(R.string.low_storage_error)); } } // Creates and starts the camera. Note that this uses a higher resolution in comparison // to other detection examples to enable the barcode detector to detect small barcodes // at long distances. mCameraSource = new CameraSource.Builder(getApplicationContext(), multiDetector) .setFacing(CameraSource.CAMERA_FACING_BACK).setRequestedPreviewSize(1920, 1080) .setRequestedFps(30.0f).setAutoFocusEnabled(true).build(); } /** * Restarts the camera. */ @Override protected void onResume() { super.onResume(); startCameraSource(); } /** * Stops the camera. */ @Override protected void onPause() { super.onPause(); mPreview.stop(); } /** * Releases the resources associated with the camera source, the associated detectors, and the * rest of the processing pipeline. */ @Override protected void onDestroy() { super.onDestroy(); if (mCameraSource != null) { mCameraSource.release(); } } /** * Callback for the result from requesting permissions. This method * is invoked for every call on {@link #requestPermissions(String[], int)}. * <p> * <strong>Note:</strong> It is possible that the permissions request interaction * with the user is interrupted. In this case you will receive empty permissions * and results arrays which should be treated as a cancellation. * </p> * * @param requestCode The request code passed in {@link #requestPermissions(String[], int)}. * @param permissions The requested permissions. Never null. * @param grantResults The grant results for the corresponding permissions * which is either {@link PackageManager#PERMISSION_GRANTED} * or {@link PackageManager#PERMISSION_DENIED}. Never null. * @see #requestPermissions(String[], int) */ @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { if (requestCode != RC_HANDLE_CAMERA_PERM) { Log.d(TAG, "Got unexpected permission result: " + requestCode); super.onRequestPermissionsResult(requestCode, permissions, grantResults); return; } if (grantResults.length != 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { Log.d(TAG, "Camera permission granted - initialize the camera source"); // we have permission, so create the camerasource createCameraSource(); return; } Log.e(TAG, "Permission not granted: results len = " + grantResults.length + " Result code = " + (grantResults.length > 0 ? grantResults[0] : "(empty)")); DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { finish(); } }; AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Multitracker sample").setMessage(R.string.no_camera_permission) .setPositiveButton(R.string.ok, listener).show(); } /** * Starts or restarts the camera source, if it exists. If the camera source doesn't exist yet * (e.g., because onResume was called before the camera source was created), this will be called * again when the camera source is created. */ private void startCameraSource() { // check that the device has play services available. int code = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(getApplicationContext()); if (code != ConnectionResult.SUCCESS) { Dialog dlg = GoogleApiAvailability.getInstance().getErrorDialog(this, code, RC_HANDLE_GMS); dlg.show(); } if (mCameraSource != null) { try { mPreview.start(mCameraSource, mGraphicOverlay); } catch (IOException e) { Log.e(TAG, "Unable to start camera source.", e); mCameraSource.release(); mCameraSource = null; } } } public void takePicture() { mCameraSource.takePicture(null, this); } public Bitmap getBitmapFromView(View view) { view.setBackgroundColor(Color.TRANSPARENT); //Define a bitmap with the same size as the view Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888); //Bind a canvas to it Canvas canvas = new Canvas(returnedBitmap); //Get the view's background Drawable bgDrawable = view.getBackground(); if (bgDrawable != null) //has background drawable, then draw it on the canvas bgDrawable.draw(canvas); else //does not have background drawable, then draw white background on the canvas canvas.drawColor(Color.WHITE); // draw the view on the canvas view.draw(canvas); //return the bitmap return returnedBitmap; } @Override public void onPictureTaken(byte[] data) { // try { Bitmap cameraBitmap = BitmapFactory.decodeByteArray(data, 0, data.length); Bitmap newImage = Bitmap.createBitmap(cameraBitmap.getWidth(), cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888); Bitmap overlayBitmap = this.getBitmapFromView(mGraphicOverlay); Bitmap overlayScaledBitmap = Bitmap.createScaledBitmap(overlayBitmap, cameraBitmap.getWidth(), cameraBitmap.getHeight(), true); Canvas canvas = new Canvas(newImage); canvas.drawBitmap(cameraBitmap, 0, 0, null); canvas.drawBitmap(overlayScaledBitmap, 0, 0, null); File storagePath = new File(Environment.getExternalStorageDirectory().getAbsolutePath()); storagePath.mkdirs(); String finalName = Long.toString(System.currentTimeMillis()); File myImage = new File(storagePath, finalName + ".jpg"); String photoPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + finalName + ".jpg"; try { FileOutputStream fos = new FileOutputStream(myImage); newImage.compress(Bitmap.CompressFormat.JPEG, 80, fos); fos.close(); } catch (IOException e) { Toast.makeText(MultiTrackerActivity.this, "Pic not saved", Toast.LENGTH_SHORT).show(); return; } Toast.makeText(MultiTrackerActivity.this, "Pic saved in: " + photoPath, Toast.LENGTH_SHORT).show(); newImage.recycle(); newImage = null; cameraBitmap.recycle(); cameraBitmap = null; } }