ScaleGestureDetectorはrecyclerviewで機能しません

Question

私はRecyclerViewをズームする必要があるプロジェクトがScaleGestureDetectorです。 RecyclerViewの外側でピンチズームしているときに機能しますが、RecyclerView以上のピンチでは機能しません。私はしばらくこの問題を解決するために苦労してきましたが、解決できませんでした。どんな助けも高く評価されます。前もって感謝します！！

は、ここに私のJavaコードこのクラスを使用することによりズームアウト&で

recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getApplicationContext(), recyclerView, new GalleryAdapter.ClickListener() { 
      @Override 
      public void onClick(View view, int position) { 
       Bundle bundle = new Bundle(); 
       bundle.putSerializable("images", images); 
       bundle.putInt("position", position); 

       FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
       SlideshowDialogFragment newFragment = SlideshowDialogFragment.newInstance(); 
       newFragment.setArguments(bundle); 
       newFragment.show(ft, "slideshow"); 
      } 

      @Override 
      public void onLongClick(View view, int position) { 

      } 
     })); 

scaleGestureDetector = new ScaleGestureDetector(
       this, new MySimpleOnScaleGestureListener(textMsg, recyclerView, factor)); 

private class MySimpleOnScaleGestureListener 
      extends ScaleGestureDetector.SimpleOnScaleGestureListener{ 

     TextView viewMessage; 
     RecyclerView viewMyImage; 

     float factor; 

     public MySimpleOnScaleGestureListener(TextView v, RecyclerView iv ,float f) { 
      super(); 
      viewMessage = v; 
      viewMyImage = iv; 
      factor = f; 
     } 

     @Override 
     public boolean onScaleBegin(ScaleGestureDetector detector) { 
      //factor = 10.0f; 
      return true; 
      //return super.onScaleBegin(detector); 
     } 

     @Override 
     public boolean onScale(ScaleGestureDetector detector) { 

      float scaleFactor = detector.getScaleFactor() - 1; 
      factor += scaleFactor; 
      viewMessage.setText(String.valueOf(scaleFactor) 
        + "\n" + String.valueOf(factor)); 
      viewMyImage.setScaleX(factor); 
      viewMyImage.setScaleY(factor); 
      return true; 
      //return super.onScale(detector); 
     } 
    } 

Answer 1

Recycleviewズームされます。

import android.content.Context; 
import android.graphics.Canvas; 
import android.support.annotation.NonNull; 
import android.support.v7.widget.RecyclerView; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.ScaleGestureDetector; 


public class PinchRecyclerView extends RecyclerView { 
    private static final int INVALID_POINTER_ID = -1; 
    private int mActivePointerId = INVALID_POINTER_ID; 
    private ScaleGestureDetector mScaleDetector; 
    private float mScaleFactor = 1.f; 
    private float maxWidth = 0.0f; 
    private float maxHeight = 0.0f; 
    private float mLastTouchX; 
    private float mLastTouchY; 
    private float mPosX; 
    private float mPosY; 
    private float width; 
    private float height; 


    public PinchRecyclerView(Context context) { 
     super(context); 
     if (!isInEditMode()) 
      mScaleDetector = new ScaleGestureDetector(getContext(), new ScaleListener()); 
    } 

    public PinchRecyclerView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     if (!isInEditMode()) 
      mScaleDetector = new ScaleGestureDetector(getContext(), new ScaleListener()); 
    } 

    public PinchRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) { 
     super(context, attrs, defStyleAttr); 
     if (!isInEditMode()) 
      mScaleDetector = new ScaleGestureDetector(getContext(), new ScaleListener()); 
    } 

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     width = MeasureSpec.getSize(widthMeasureSpec); 
     height = MeasureSpec.getSize(heightMeasureSpec); 
     super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
    } 

    @Override 
    public boolean onInterceptTouchEvent(MotionEvent ev) { 
     try { 
      return super.onInterceptTouchEvent(ev); 
     } catch (IllegalArgumentException ex) { 
      ex.printStackTrace(); 
     } 
     return false; 
    } 

    @Override 
    public boolean onTouchEvent(@NonNull MotionEvent ev) { 
     super.onTouchEvent(ev); 
     final int action = ev.getAction(); 
     mScaleDetector.onTouchEvent(ev); 
     switch (action & MotionEvent.ACTION_MASK) { 
      case MotionEvent.ACTION_DOWN: { 
       final float x = ev.getX(); 
       final float y = ev.getY(); 
       mLastTouchX = x; 
       mLastTouchY = y; 
       mActivePointerId = ev.getPointerId(0); 
       break; 
      } 

      case MotionEvent.ACTION_MOVE: { 

       final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) 
         >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; 
       final float x = ev.getX(pointerIndex); 
       final float y = ev.getY(pointerIndex); 
       final float dx = x - mLastTouchX; 
       final float dy = y - mLastTouchY; 

       mPosX += dx; 
       mPosY += dy; 

       if (mPosX > 0.0f) 
        mPosX = 0.0f; 
       else if (mPosX < maxWidth) 
        mPosX = maxWidth; 

       if (mPosY > 0.0f) 
        mPosY = 0.0f; 
       else if (mPosY < maxHeight) 
        mPosY = maxHeight; 

       mLastTouchX = x; 
       mLastTouchY = y; 

       invalidate(); 
       break; 
      } 

      case MotionEvent.ACTION_UP: { 
       mActivePointerId = INVALID_POINTER_ID; 
       break; 
      } 

      case MotionEvent.ACTION_CANCEL: { 
       mActivePointerId = INVALID_POINTER_ID; 
       break; 
      } 

      case MotionEvent.ACTION_POINTER_UP: { 
       final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; 
       final int pointerId = ev.getPointerId(pointerIndex); 
       if (pointerId == mActivePointerId) { 
        final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 
        mLastTouchX = ev.getX(newPointerIndex); 
        mLastTouchY = ev.getY(newPointerIndex); 
        mActivePointerId = ev.getPointerId(newPointerIndex); 
       } 
       break; 
      } 
     } 

     return true; 
    } 

    @Override 
    public void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     canvas.save(Canvas.MATRIX_SAVE_FLAG); 
     canvas.translate(mPosX, mPosY); 
     canvas.scale(mScaleFactor, mScaleFactor); 
     canvas.restore(); 
    } 

    @Override 
    protected void dispatchDraw(@NonNull Canvas canvas) { 
     canvas.save(Canvas.MATRIX_SAVE_FLAG); 
     if (mScaleFactor == 1.0f) { 
      mPosX = 0.0f; 
      mPosY = 0.0f; 
     } 
     canvas.translate(mPosX, mPosY); 
     canvas.scale(mScaleFactor, mScaleFactor); 
     super.dispatchDraw(canvas); 
     canvas.restore(); 
     invalidate(); 
    } 

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { 
     @Override 
     public boolean onScale(ScaleGestureDetector detector) { 
      mScaleFactor *= detector.getScaleFactor(); 
      mScaleFactor = Math.max(1.0f, Math.min(mScaleFactor, 3.0f)); 
      maxWidth = width - (width * mScaleFactor); 
      maxHeight = height - (height * mScaleFactor); 
      invalidate(); 
      return true; 
     } 
    } 
} 

希望すると助かります！