Android中自定义View支持缩放
16lz
2021-01-23
参考网址：https://blog.csdn.net/zqurapig/article/details/83414389
https://blog.csdn.net/u010648159/article/details/80854797
public class ScaleGestureDemoView extends View { private static final String TAG = "ScaleGestureDemoView"; private ScaleGestureDetector mScaleGestureDetector; public ScaleGestureDemoView(Context context) { super(context); } public ScaleGestureDemoView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); initScaleGestureDetector(); } private void initScaleGestureDetector() { mScaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.SimpleOnScaleGestureListener() { @Override public boolean onScaleBegin(ScaleGestureDetector detector) { return true; } @Override public boolean onScale(ScaleGestureDetector detector) { Log.i(TAG, "focusX = " + detector.getFocusX()); // 缩放中心，x坐标 Log.i(TAG, "focusY = " + detector.getFocusY()); // 缩放中心y坐标 Log.i(TAG, "scale = " + detector.getScaleFactor()); // 缩放因子 return true; } @Override public void onScaleEnd(ScaleGestureDetector detector) { } }); } @Override public boolean onTouchEvent(MotionEvent event) { mScaleGestureDetector.onTouchEvent(event); return true; }}
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