Android: Rotate image in imageview by an angle

Android: Rotate image in imageview by an angle

To rotate an image in an ImageView by a specific angle in Android, you can use the following code. Here's an example in Kotlin:

import android.graphics.Bitmap import android.graphics.Matrix import android.os.Bundle import android.widget.ImageView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val imageView: ImageView = findViewById(R.id.imageView) // Load your image into the ImageView (replace R.drawable.your_image with your image resource) imageView.setImageResource(R.drawable.your_image) // Rotate the image by a specific angle (e.g., 45 degrees) val rotatedBitmap = rotateBitmap(imageView.drawable.toBitmap(), 45f) // Set the rotated image to the ImageView imageView.setImageBitmap(rotatedBitmap) } private fun rotateBitmap(src: Bitmap, angle: Float): Bitmap { val matrix = Matrix() matrix.postRotate(angle) return Bitmap.createBitmap(src, 0, 0, src.width, src.height, matrix, true) } }

This example assumes you have an ImageView in your layout file (e.g., activity_main.xml). Replace R.drawable.your_image with the actual image resource you want to display. The rotateBitmap function rotates the bitmap by the specified angle, and the rotated bitmap is set to the ImageView.

Make sure to add the necessary permissions in your AndroidManifest.xml to read from the resources and display the image:

<uses-permission android:name="android.permission.INTERNET" />

Also, ensure that you have the appropriate resources in your res/drawable folder.

Examples

  1. "Android rotate image in ImageView programmatically"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); imageView.setRotation(angleInDegrees);
    • Description: This code rotates an image in an ImageView programmatically by setting the rotation angle in degrees.

  2. "Android rotate image in ImageView with animation"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); ObjectAnimator rotateAnimator = ObjectAnimator.ofFloat(imageView, "rotation", angleInDegrees); rotateAnimator.setDuration(1000); // Set animation duration in milliseconds rotateAnimator.start();
    • Description: This code rotates an image in an ImageView with a smooth animation using ObjectAnimator.

  3. "Android rotate image in ImageView on button click"

    • Code Implementation:
      Button rotateButton = findViewById(R.id.rotateButton); ImageView imageView = findViewById(R.id.imageView); rotateButton.setOnClickListener(v -> { imageView.setRotation(imageView.getRotation() + 45f); });
    • Description: This code rotates an image in an ImageView when a button is clicked.

  4. "Android rotate image in ImageView with Matrix"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); Matrix matrix = new Matrix(); matrix.postRotate(angleInDegrees); imageView.setImageMatrix(matrix);
    • Description: This code rotates an image in an ImageView using a Matrix transformation.

  5. "Android rotate image in ImageView with pinch-to-zoom"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); imageView.setOnTouchListener(new ImageMatrixTouchHandler(this));
    • Description: This code allows rotating an image in an ImageView with pinch-to-zoom using a custom touch handler.

  6. "Android rotate image in ImageView with gestures"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); imageView.setOnTouchListener(new RotateGestureDetector(this, new RotateListener() { @Override public void onRotate(float angle) { imageView.setRotation(imageView.getRotation() + angle); } }));
    • Description: This code allows rotating an image in an ImageView with gestures using a custom gesture detector.

  7. "Android rotate image in ImageView with animation and interpolator"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); ObjectAnimator rotateAnimator = ObjectAnimator.ofFloat(imageView, "rotation", angleInDegrees); rotateAnimator.setDuration(1000); // Set animation duration in milliseconds rotateAnimator.setInterpolator(new AccelerateDecelerateInterpolator()); rotateAnimator.start();
    • Description: This code rotates an image in an ImageView with a smooth animation and a specified interpolator.

  8. "Android rotate image in ImageView on swipe gesture"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); imageView.setOnTouchListener(new OnSwipeTouchListener(this) { @Override public void onSwipeLeft() { imageView.setRotation(imageView.getRotation() - 45f); } @Override public void onSwipeRight() { imageView.setRotation(imageView.getRotation() + 45f); } });
    • Description: This code rotates an image in an ImageView when swiping left or right using a custom touch listener.

  9. "Android rotate image in ImageView with fixed pivot point"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); imageView.setPivotX(0); // Set X-axis pivot point imageView.setPivotY(0); // Set Y-axis pivot point imageView.setRotation(angleInDegrees);
    • Description: This code rotates an image in an ImageView around a fixed pivot point on the X and Y axes.

  10. "Android rotate image in ImageView with multi-touch rotation"

    • Code Implementation:
      ImageView imageView = findViewById(R.id.imageView); imageView.setOnTouchListener(new MultiTouchListener());
    • Description: This code allows multi-touch rotation of an image in an ImageView using a custom touch listener.

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