使用移动视觉API

Question

            Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            takePicture.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
            startActivityForResult(takePicture,0);



protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
  //  Bitmap bitmap =(Bitmap)data.getExtras().get("Data");
   // imageView.setImageBitmap(bitmap);

    FaceDetector detector;
    ImageView myImageView = (ImageView) findViewById(R.id.ivImage);
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inMutable=true;

    fileUri  = getOutputMediaFileUri(FileColumns.MEDIA_TYPE_IMAGE);

    final  Bitmap myBitmap = BitmapFactory.decodeFile(fileUri.toString(),options);


 // Bitmap myBitmap = BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.me);


    Paint myRectPaint = new Paint();
    myRectPaint.setStrokeWidth(5);
   myRectPaint.setColor(Color.RED);
   myRectPaint.setStyle(Paint.Style.STROKE);



   Bitmap tempBitmap = Bitmap.createBitmap(myBitmap.getWidth(), myBitmap.getHeight(), Bitmap.Config.RGB_565);
    Canvas tempCanvas = new Canvas(tempBitmap);
    tempCanvas.drawBitmap(myBitmap, 0, 0, null);


   FaceDetector faceDetector = new  FaceDetector.Builder(getApplicationContext()).setTrackingEnabled(false).build();


   Frame frame = new Frame.Builder().setBitmap(myBitmap).build();
   SparseArray<com.google.android.gms.vision.face.Face> faces = faceDetector.detect(frame);
   if(!faceDetector.isOperational())
   {
        new AlertDialog.Builder(this).setMessage("Face Detector :(").show();
        return;
   }
    for(int i=0; i<faces.size(); i++)
    {
       Face thisFace = faces.valueAt(i);
       float x1 = thisFace.getPosition().x;
       float y1 = thisFace.getPosition().y;
       float x2 = x1 + thisFace.getWidth();
       float y2 = y1 + thisFace.getHeight();
       tempCanvas.drawRoundRect(new RectF(x1, y1, x2, y2), 2, 2, myRectPaint);
    }

   myImageView.setImageDrawable(new BitmapDrawable(getResources(),tempBitmap));
}

错误

此时

  

12-04 19：54：41.419 14215-14215 / com.example.user.demo E / BitmapFactory：   无法解码流：java.io.FileNotFoundException：   文件：/storage/emulated/0/Pictures/IMAGE_DIRECTORY_NAME/IMG_20171204_195441.jpg：   打开失败：ENOENT（没有这样的文件或目录）12-04 19：54：41.462   14215-14215 / com.example.user.demo E / AndroidRuntime：FATAL EXCEPTION：   主要                                                                          处理：com.example.user.demo，PID：14215

     

java.lang.RuntimeException：传递结果失败   ResultInfo {who = null，request = 0，result = -1，data = Intent {   act = inline-data dat = content：// media / external / images / media / 139760   typ = image / jpeg（有额外的）}}到活动   {com.example.user.demo / com.example.user.demo.MainActivity}：   java.lang.NullPointerException：尝试调用虚方法'int   空对象引用上的android.graphics.Bitmap.getWidth（）'   在com.example.user.demo.MainActivity.onActivityResult - ＆gt;＆gt;＆gt;。位图   tempBitmap = Bitmap.createBitmap（myBitmap.getWidth（），   myBitmap.getHeight（），Bitmap.Config.RGB_565）;