Android中自定义View支持缩放

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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