android 手指移动的动画,Android 视频手势缩放与自动吸附动效实现

@date 2020/12/2

*/

public class VideoTouchScaleHandler implements IVideoTouchHandler, ScaleGestureDetector.OnScaleGestureListener {

private static final String TAG = "VideoTouchScaleHandler";

private Context mContext;

public FrameLayout mContainer;

private boolean openScaleTouch = true; // 开启缩放

private boolean mIsScaleTouch;

private Matrix mScaleTransMatrix; // 缓存了上次的矩阵值，所以需要计算每次变化量

private float mStartCenterX, mStartCenterY, mLastCenterX, mLastCenterY, centerX, centerY;

private float mStartSpan, mLastSpan, mCurrentSpan;

private float mScale;

private float[] mMatrixValue = new float[9];

private float mMinScale = 0.1F, mMaxScale = 3F;

private VideoScaleEndAnimator mScaleAnimator;

IVideoTouchAdapter mTouchAdapter;

TouchScaleResetView mScaleRestView;

public VideoTouchScaleHandler(Context context, FrameLayout container,

IVideoTouchAdapter videoTouchAdapter) {

mContext = context;

mContainer = container;

mTouchAdapter = videoTouchAdapter;

initView();

}

private void initView() {

mScaleRestView = new TouchScaleResetView(mContext, mContainer) {

@Override

public void clickResetScale() {

mScaleRestView.setVisibility(View.GONE);

if (isScaled()) {

cancelScale();

}

}

};

}

private Context getContext() {

return mContext;

}

@Override

public boolean onScaleBegin(ScaleGestureDetector detector) {

TextureView mTextureView = mTouchAdapter.getTextureView();

if (mTextureView != null) {

mIsScaleTouch = true;

if (mScaleTransMatrix == null) {

mScaleTransMatrix = new Matrix(mTextureView.getMatrix());

onScaleMatrixUpdate(mScaleTransMatrix);

}

}

mStartCenterX = detector.getFocusX();

mStartCenterY = detector.getFocusY();

mStartSpan = detector.getCur