画像ボタンをタッチしているときに、ズームインを追加するにはどうすればよいですか？

Question

imagebuttonを操作するとimagebuttonがzoominやzoomoutを表示し、次のactivityにジャンプする必要があります。これにソースコードがありますか？

Answer 1

ImageViewにズームイン、ズームアウト機能を追加するコードは次のとおりです。

class Acitivty implements View.OnTouchListener // 


private static final String TAG = "Touch"; 
@SuppressWarnings("unused") 
private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f; 

// These matrices will be used to scale points of the image 
Matrix matrix = new Matrix(); 
Matrix savedMatrix = new Matrix(); 

// The 3 states (events) which the user is trying to perform 
static final int NONE = 0; 
static final int DRAG = 1; 
static final int ZOOM = 2; 
int mode = NONE; 

// these PointF objects are used to record the point(s) the user is touching 
PointF start = new PointF(); 
PointF mid = new PointF(); 
float oldDist = 1f; 


//TODO 
image.setOnTouchListener(this); 


@Override 
public boolean onTouch(View v, MotionEvent event) 
{ 
    ImageView view = (ImageView) v; 
    view.setScaleType(ImageView.ScaleType.MATRIX); 
    float scale; 

    dumpEvent(event); 
    // Handle touch events here... 

    switch (event.getAction() & MotionEvent.ACTION_MASK) 
    { 
     case MotionEvent.ACTION_DOWN: // first finger down only 
      matrix.set(view.getImageMatrix()); 
      savedMatrix.set(matrix); 
      start.set(event.getX(), event.getY()); 
      Log.d(TAG, "mode=DRAG"); // write to LogCat 
      mode = DRAG; 
      break; 

     case MotionEvent.ACTION_UP: // first finger lifted 

     case MotionEvent.ACTION_POINTER_UP: // second finger lifted 

      mode = NONE; 
      Log.d(TAG, "mode=NONE"); 
      break; 

     case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down 

      oldDist = spacing(event); 
      Log.d(TAG, "oldDist=" + oldDist); 
      if (oldDist > 5f) { 
       savedMatrix.set(matrix); 
       midPoint(mid, event); 
       mode = ZOOM; 
       Log.d(TAG, "mode=ZOOM"); 
      } 
      break; 

     case MotionEvent.ACTION_MOVE: 

      if (mode == DRAG) 
      { 
       matrix.set(savedMatrix); 
       matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix of points 
      } 
      else if (mode == ZOOM) 
      { 
       // pinch zooming 
       float newDist = spacing(event); 
       Log.d(TAG, "newDist=" + newDist); 
       if (newDist > 5f) 
       { 
        matrix.set(savedMatrix); 
        scale = newDist/oldDist; // setting the scaling of the 
        // matrix...if scale > 1 means 
        // zoom in...if scale < 1 means 
        // zoom out 
        matrix.postScale(scale, scale, mid.x, mid.y); 
       } 
      } 
      break; 
    } 

    view.setImageMatrix(matrix); // display the transformation on screen 

    return true; // indicate event was handled 
} 

/* 
* -------------------------------------------------------------------------- 
* Method: spacing Parameters: MotionEvent Returns: float Description: 
* checks the spacing between the two fingers on touch 
* ---------------------------------------------------- 
*/ 

private float spacing(MotionEvent event) 
{ 
    float x = event.getX(0) - event.getX(1); 
    float y = event.getY(0) - event.getY(1); 
    return (float)Math.sqrt(x * x + y * y); 
} 

/* 
* -------------------------------------------------------------------------- 
* Method: midPoint Parameters: PointF object, MotionEvent Returns: void 
* Description: calculates the midpoint between the two fingers 
* ------------------------------------------------------------ 
*/ 

private void midPoint(PointF point, MotionEvent event) 
{ 
    float x = event.getX(0) + event.getX(1); 
    float y = event.getY(0) + event.getY(1); 
    point.set(x/2, y/2); 
} 

/** Show an event in the LogCat view, for debugging */ 
private void dumpEvent(MotionEvent event) 
{ 
    String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE","POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" }; 
    StringBuilder sb = new StringBuilder(); 
    int action = event.getAction(); 
    int actionCode = action & MotionEvent.ACTION_MASK; 
    sb.append("event ACTION_").append(names[actionCode]); 

    if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP) 
    { 
     sb.append("(pid ").append(action >> MotionEvent.ACTION_POINTER_ID_SHIFT); 
     sb.append(")"); 
    } 

    sb.append("["); 
    for (int i = 0; i < event.getPointerCount(); i++) 
    { 
     sb.append("#").append(i); 
     sb.append("(pid ").append(event.getPointerId(i)); 
     sb.append(")=").append((int) event.getX(i)); 
     sb.append(",").append((int) event.getY(i)); 
     if (i + 1 < event.getPointerCount()) 
      sb.append(";"); 
    } 

    sb.append("]"); 
    Log.d("Touch Events ---------", sb.toString()); 
}