TLIB.02-Solution-DetectFaces

app/src/main/java/com/example/android/emojify/Emojifier.java

@@ -0,0 +1,64 @@
+/*
+* Copyright (C) 2017 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.example.android.emojify;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.util.Log;
+import android.util.SparseArray;
+import android.widget.Toast;
+
+import com.google.android.gms.vision.Frame;
+import com.google.android.gms.vision.face.Face;
+import com.google.android.gms.vision.face.FaceDetector;
+
+class Emojifier {
+
+    private static final String LOG_TAG = Emojifier.class.getSimpleName();
+
+    /**
+     * Method for detecting faces in a bitmap.
+     *
+     * @param context The application context.
+     * @param picture The picture in which to detect the faces.
+     */
+    static void detectFaces(Context context, Bitmap picture) {
+
+        // Create the face detector, disable tracking and enable classifications
+        FaceDetector detector = new FaceDetector.Builder(context)
+                .setTrackingEnabled(false)
+                .setClassificationType(FaceDetector.ALL_CLASSIFICATIONS)
+                .build();
+
+        // Build the frame
+        Frame frame = new Frame.Builder().setBitmap(picture).build();
+
+        // Detect the faces
+        SparseArray<Face> faces = detector.detect(frame);
+
+        // Log the number of faces
+        Log.d(LOG_TAG, "detectFaces: number of faces = " + faces.size());
+
+        // If there are no faces detected, show a Toast message
+        if(faces.size() == 0){
+            Toast.makeText(context, R.string.no_faces_message, Toast.LENGTH_SHORT).show();
+        }
+
+        // Release the detector
+        detector.release();
+    }
+}

app/src/main/java/com/example/android/emojify/MainActivity.java

@@ -41,9 +41,6 @@
 
 public class MainActivity extends AppCompatActivity {
 
-    // TODO (1): Create a Java class called Emojifier
-        // TODO (2): Create a static method in the Emojifier class called detectFaces() which detects and logs the number of faces in a given bitmap.
-
     private static final int REQUEST_IMAGE_CAPTURE = 1;
     private static final int REQUEST_STORAGE_PERMISSION = 1;
 
@@ -183,9 +180,10 @@ private void processAndSetImage() {
 
         // Resample the saved image to fit the ImageView
         mResultsBitmap = BitmapUtils.resamplePic(this, mTempPhotoPath);
-
-        // TODO (3): Call the new detectFaces() method, passing in the resampled bitmap to detect the faces in the picture.
-
+
+        // Detect the faces
+        Emojifier.detectFaces(this, mResultsBitmap);
+
         // Set the new bitmap to the ImageView
         mImageView.setImageBitmap(mResultsBitmap);
     }

app/src/main/res/values/strings.xml

@@ -23,4 +23,5 @@
     <string name="go">GO</string>
     <string name="permission_denied">Permission denied</string>
     <string name="imageview_description">The imageview that contains the emojified picture</string>
+    <string name="no_faces_message">No Faces Detected</string>
 </resources>