Android: Rotate image in imageview by an angle

Question

I am using the following code to rotate a image in ImageView by an angle. Is there any simpler and less complex method available.

ImageView iv = (ImageView)f         


        

Answer 1

Matrix matrix = new Matrix();
imageView.setScaleType(ImageView.ScaleType.MATRIX); //required
matrix.postRotate((float) 20, imageView.getDrawable().getBounds().width()/2, imageView.getDrawable().getBounds().height()/2);
imageView.setImageMatrix(matrix);

how to use?

public class MainActivity extends AppCompatActivity {
   int view = R.layout.activity_main;
   TextView textChanger;
   ImageView imageView;
   @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(view);
      textChanger = findViewById(R.id.textChanger);
      imageView=findViewById(R.id.imageView);
      textChanger.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            roateImage(imageView);
         }
      });
   }
   private void roateImage(ImageView imageView) {
      Matrix matrix = new Matrix();
      imageView.setScaleType(ImageView.ScaleType.MATRIX); //required
      matrix.postRotate((float) 20, imageView.getDrawable().getBounds().width()/2,    imageView.getDrawable().getBounds().height()/2);
      imageView.setImageMatrix(matrix);
   }
}