我正在使用这个库 http://www.truiton.com/2017/05/android-face-detection-example/
当我要按扫描面时，我收到此错误。我不知道为什么。 扫描失败：没有找到任何扫描 我在我的应用程序上添加了权限。我再次得到错误。 我正在尝试很多事情，但我没有找到任何东西。 图像也保存在我的SD卡上。但我得到了错误
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.button);
scanResults = (TextView) findViewById(R.id.results);
imageView = (ImageView) findViewById(R.id.scannedResults);
if (savedInstanceState != null) {
editedBitmap = savedInstanceState.getParcelable(SAVED_INSTANCE_BITMAP);
if (savedInstanceState.getString(SAVED_INSTANCE_URI) != null) {
imageUri = Uri.parse(savedInstanceState.getString(SAVED_INSTANCE_URI));
}
imageView.setImageBitmap(editedBitmap);
scanResults.setText(savedInstanceState.getString(SAVED_INSTANCE_RESULT));
}
detector = new FaceDetector.Builder(getApplicationContext())
.setTrackingEnabled(false)
.setLandmarkType(FaceDetector.ALL_LANDMARKS)
.setClassificationType(FaceDetector.ALL_CLASSIFICATIONS)
.build();
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(MainActivity.this, new
String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_PERMISSION);
}
});
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_WRITE_PERMISSION:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
takePicture();
} else {
Toast.makeText(MainActivity.this, "Permission Denied!", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PHOTO_REQUEST && resultCode == RESULT_OK) {
launchMediaScanIntent();
try {
scanFaces();
} catch (Exception e) {
Toast.makeText(this, "Failed to load Image", Toast.LENGTH_SHORT).show();
Log.e(LOG_TAG, e.toString());
}
}
}
private void scanFaces() throws Exception {
Bitmap bitmap = decodeBitmapUri(this, imageUri);
if (detector.isOperational() && bitmap != null) {
editedBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), bitmap.getConfig());
float scale = getResources().getDisplayMetrics().density;
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.rgb(255, 61, 61));
paint.setTextSize((int) (14 * scale));
paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3f);
Canvas canvas = new Canvas(editedBitmap);
canvas.drawBitmap(bitmap, 0, 0, paint);
Frame frame = new Frame.Builder().setBitmap(editedBitmap).build();
SparseArray<Face> faces = detector.detect(frame);
scanResults.setText(null);
for (int index = 0; index < faces.size(); ++index) {
Face face = faces.valueAt(index);
canvas.drawRect(
face.getPosition().x,
face.getPosition().y,
face.getPosition().x + face.getWidth(),
face.getPosition().y + face.getHeight(), paint);
scanResults.setText(scanResults.getText() + "Face " + (index + 1) + "\n");
scanResults.setText(scanResults.getText() + "Smile probability:" + "\n");
scanResults.setText(scanResults.getText() + String.valueOf(face.getIsSmilingProbability()) + "\n");
scanResults.setText(scanResults.getText() + "Left Eye Open Probability: " + "\n");
scanResults.setText(scanResults.getText() + String.valueOf(face.getIsLeftEyeOpenProbability()) + "\n");
scanResults.setText(scanResults.getText() + "Right Eye Open Probability: " + "\n");
scanResults.setText(scanResults.getText() + String.valueOf(face.getIsRightEyeOpenProbability()) + "\n");
scanResults.setText(scanResults.getText() + "---------" + "\n");
for (Landmark landmark : face.getLandmarks()) {
int cx = (int) (landmark.getPosition().x);
int cy = (int) (landmark.getPosition().y);
canvas.drawCircle(cx, cy, 5, paint);
}
}
if (faces.size() == 0) {
scanResults.setText("Scan Failed: Found nothing to scan");
} else {
imageView.setImageBitmap(editedBitmap);
scanResults.setText(scanResults.getText() + "No of Faces Detected: " + "\n");
scanResults.setText(scanResults.getText() + String.valueOf(faces.size()) + "\n");
scanResults.setText(scanResults.getText() + "---------" + "\n");
}
} else {
scanResults.setText("Could not set up the detector!");
}
}
private void takePicture() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File photo = new File(Environment.getExternalStorageDirectory(), "picture.jpg");
imageUri = FileProvider.getUriForFile(MainActivity.this,
BuildConfig.APPLICATION_ID + ".provider", photo);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, PHOTO_REQUEST);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
if (imageUri != null) {
outState.putParcelable(SAVED_INSTANCE_BITMAP, editedBitmap);
outState.putString(SAVED_INSTANCE_URI, imageUri.toString());
outState.putString(SAVED_INSTANCE_RESULT, scanResults.getText().toString());
}
super.onSaveInstanceState(outState);
}
@Override
protected void onDestroy() {
super.onDestroy();
detector.release();
}
private void launchMediaScanIntent() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
mediaScanIntent.setData(imageUri);
this.sendBroadcast(mediaScanIntent);
}
private Bitmap decodeBitmapUri(Context ctx, Uri uri) throws FileNotFoundException {
int targetW = 600;
int targetH = 600;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(ctx.getContentResolver().openInputStream(uri), null, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
int scaleFactor = Math.min(photoW / targetW, photoH / targetH);
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
return BitmapFactory.decodeStream(ctx.getContentResolver()
.openInputStream(uri), null, bmOptions);
}