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我有一个过去2天的问题,无法解决它,因为我是新手。其实我正在开发一款Android应用程序,需要在Android ImageView上进行双指缩放和双指旋转。我有多个教程和解决方案适用于捏变焦,但不适用于2指旋转。我分享了最简单的教程,这个教程很容易理解,我想将它扩展为2个手指旋转。以下是代码片段:捏缩放和2个手指旋转Android中的ImageView
public class MainActivity extends Activity {
private ImageView mImageView;
private Matrix mMatrix = new Matrix();
private float mScale = 1f;
private ScaleGestureDetector mScaleGestureDetector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mImageView = (ImageView) findViewById(R.id.imageView);
mScaleGestureDetector = new ScaleGestureDetector(this, new ScaleListener());
}
public boolean onTouchEvent(MotionEvent ev) {
mScaleGestureDetector.onTouchEvent(ev);
return true;
}
private class ScaleListener extends ScaleGestureDetector.
SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScale *= detector.getScaleFactor();
mScale = Math.max(0.1f, Math.min(mScale, 5.0f));
mMatrix.setScale(mScale, mScale);
mImageView.setImageMatrix(mMatrix);
return true;
}
}
}
另外我想用它们来GPUImage,我的意思是,尽管Android的ImageView的我想用GPUImage。如何将GPUImage转换为ImageView?这是第二件事。首先,我想实现2指旋转(或某种意义上的MultiTouch)。谢谢
这是我之前发布的解决方案。 https://stackoverflow.com/questions/6578320/how-to-apply-zoom-drag-and-rotation-to-an-image-in-android/47861501#47861501 – user2288580