使用原始方向的Android视图相机照片

Question

如果相机使用肖像拍摄照片，我需要知道如何以纵向查看我的照片。

public class PVCameraActivity extends AppCompatActivity { 
    private ImageView imageview; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_pvcamera); 
     imageview = (ImageView) findViewById(R.id.imageview); 
     Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     Uri imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"picture.jpg")); 
     intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); 
     startActivityForResult(intent, Activity.DEFAULT_KEYS_DIALER); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == Activity.DEFAULT_KEYS_DIALER) { 
      imageview.setImageURI(Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "picture.jpg"))); 
     } 
    } 
} 

Answer 1

使用ExifInterface取回照片方向，然后将其旋转到正确的方向：

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{ 
    if (requestCode == Activity.DEFAULT_KEYS_DIALER) 
    { 
     try 
     { 
      String filePath = new File(Environment.getExternalStorageDirectory(), "picture.jpg").getAbsolutePath(); 

      ExifInterface exifInterface = new ExifInterface(filePath); 
      int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED); 

      float angle = 0; 
      switch (orientation) 
      { 
       case ExifInterface.ORIENTATION_ROTATE_90: 
        angle = 90f; 
        break; 
       case ExifInterface.ORIENTATION_ROTATE_180: 
        angle = 180f; 
        break; 
       case ExifInterface.ORIENTATION_ROTATE_270: 
        angle = 270f; 
        break; 
      } 

      Matrix matrix = new Matrix(); 
      matrix.postRotate(angle); 

      Bitmap bitmap = BitmapFactory.decodeFile(filePath); 
      bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); 

      imageview.setImageBitmap(bitmap); 
     } 
     catch (IOException e) 
     { 
      e.printStackTrace(); 
     } 
    } 
}