Android：将imageview中的图像旋转一个角度

#1 楼

import android.graphics.Matrix;
import android.widget.ImageView;

Matrix matrix = new Matrix();
imageView.setScaleType(ImageView.ScaleType.MATRIX);   //required
matrix.postRotate((float) angle, pivotX, pivotY);
imageView.setImageMatrix(matrix);

#2 楼

#3 楼

android:rotation="90"

#4 楼

imageView = (ImageView) findViewById(R.id.imageView);
Bitmap myImg = BitmapFactory.decodeResource(getResources(), R.drawable.image);

Matrix matrix = new Matrix();
matrix.postRotate(30);

Bitmap rotated = Bitmap.createBitmap(myImg, 0, 0, myImg.getWidth(), myImg.getHeight(),
        matrix, true);

imageView.setImageBitmap(rotated);

 <?xml version="1.0" encoding="utf-8"?>
<rotate
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:fromDegrees="45"
  android:toDegrees="45"
  android:pivotX="50%"
  android:pivotY="50%"
  android:duration="0"
  android:startOffset="0"
/>

Animation rotation = AnimationUtils.loadAnimation(this, R.anim.rotation);
myView.startAnimation(rotation);

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#7 楼

imageView.animate().rotation(180).start();

#8 楼

mImageView.rotation = 90f //angle in float

#9 楼

    int h,w;
    Boolean safe=true;

    rotateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if(imageView.getRotation()/90%2==0){
                h=imageView.getHeight();
                w=imageView.getWidth();

            }
        .
        .//Insert the code Snippet below here 
       }

if(safe)     
imageView.animate().rotationBy(90).scaleX(imageView.getRotation()/90%2==0?(w*1.0f/h):1).scaleY(imageView.getRotation()/90%2==0?(w*1.0f/h):1).setDuration(2000).setInterpolator(new LinearInterpolator()).setListener(new Animator.AnimatorListener() {
                @Override
                public void onAnimationStart(Animator animation) {
                      safe=false;
                }

                @Override
                public void onAnimationEnd(Animator animation) {
                      safe=true;

                }

                @Override
                public void onAnimationCancel(Animator animation) {

                }

                @Override
                public void onAnimationRepeat(Animator animation) {

                }
            }).start();
        }
    });

#10 楼

imageView.scaleY = -1f
imageView.scaleX = -1f

imageView.scaleY = 1f
imageView.scaleX = 1f

#11 楼

imgSplash.animate().rotationBy(360f).setDuration(3000).setInterpolator(new LinearInterpolator()).start();

#12 楼

int angle = 0;
imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            angle = angle + 90;
            imageView.setRotation(angle);
        }
    });

#13 楼

public class DrawView extends View {


    public DrawView(Context context,AttributeSet attributeSet){
        super(context, attributeSet);
    }

    @Override
    public void onDraw(Canvas canvas) {
        /*Canvas c=new Canvas(BitmapFactory.decodeResource(getResources(), R.drawable.new_minute1)    );

        c.rotate(45);*/

        canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.new_minute1), 0, 0, null);
        canvas.rotate(45);
    }
}

#14 楼

Drawable getRotateDrawable(final Bitmap b, final float angle) {
    final BitmapDrawable drawable = new BitmapDrawable(getResources(), b) {
        @Override
        public void draw(final Canvas canvas) {
            canvas.save();
            canvas.rotate(angle, b.getWidth() / 2, b.getHeight() / 2);
            super.draw(canvas);
            canvas.restore();
        }
    };
    return drawable;
}

Bitmap b=...
float angle=...
final Drawable rotatedDrawable = getRotateDrawable(b,angle);
root.setImageDrawable(rotatedDrawable);

#15 楼

iv.setRotation(float)

#16 楼

<!-- rotation of the view, in degrees. -->
<attr name="rotation" format="float" />

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#19 楼

{
    img_view = (ImageView) findViewById(R.id.imageView);
    rotate = new RotateAnimation(0 ,300);
    rotate.setDuration(500);
    img_view.startAnimation(rotate);
}

#20 楼

            Bitmap yourSelectedImage= BitmapFactory.decodeFile(filePath);
            Matrix mat = new Matrix();
            mat.postRotate((270)); //degree how much you rotate i rotate 270
            Bitmap bMapRotate=Bitmap.createBitmap(yourSelectedImage, 0,0,yourSelectedImage.getWidth(),yourSelectedImage.getHeight(), mat, true);
            image.setImageBitmap(bMapRotate);
            Drawable d=new BitmapDrawable(yourSelectedImage);
            image.setBackground(d); 

#21 楼

        @Override
        public void onClick(View view) {
            if(bitmap==null){
                Toast.makeText(getApplicationContext(), "Image photo is not yet set", Toast.LENGTH_LONG).show();
            }
            else {
                Matrix matrix = new Matrix();
                ivImageProduct.setScaleType(ImageView.ScaleType.MATRIX);   //required
                matrix.postRotate(90,ivImageProduct.getDrawable().getBounds().width()/2,ivImageProduct.getDrawable().getBounds().height()/2);
                Bitmap bmp=Bitmap.createBitmap(bitmap, 0, 0,bitmap.getWidth(), bitmap.getHeight(), matrix, true);
                bitmap.recycle();
                bitmap=bmp;
                ivImageProduct.setImageBitmap(bitmap);
            }
        }

#22 楼

#23 楼

int i=0;

imageView.setRotation(i+90);
i=i+90;

#24 楼

android:scaleX="-1"
android:scaleY="-1"

#25 楼

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);

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);
   }
}