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我有一個過去2天的問題,無法解決它,因爲我是新手。其實我正在開發一款Android應用程序,需要在Android ImageView上進行雙指縮放和雙指旋轉。我有多個教程和解決方案適用於捏變焦,但不適用於2指旋轉。我分享了最簡單的教程,這個教程很容易理解,我想將它擴展爲2個手指旋轉。以下是代碼片段:捏縮放和2個手指旋轉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;
}
}
}
另外我想用它們來GPUImage,我的意思是,儘管Android的ImageView的我想用GPUImage。如何將GPUImage轉換爲ImageView?這是第二件事。首先,我想實現2指旋轉(或某種意義上的MultiTouch)。謝謝
這是我之前發佈的解決方案。 https://stackoverflow.com/questions/6578320/how-to-apply-zoom-drag-and-rotation-to-an-image-in-android/47861501#47861501 – user2288580