iv = (ImageView) findViewById(R.id.iv);
iv.setOnTouchListener(new MulitPointTouchListener(iv));
iv.setScaleType(ScaleType.CENTER_INSIDE);
iv.setOnTouchListener(new MulitPointTouchListener(iv));
iv.setScaleType(ScaleType.CENTER_INSIDE);
Java代码 10f) { savedMatrix.set(matrix); midPoint(mid, event); mode = ZOOM; } break; case MotionEvent.ACTION_UP: Log.w("FLAG", "ACTION_UP"); case MotionEvent.ACTION_POINTER_UP: Log.w("FLAG", "ACTION_POINTER_UP"); mode = NONE; break; case MotionEvent.ACTION_MOVE: Log.w("FLAG", "ACTION_MOVE"); if (mode == DRAG) { matrix.set(savedMatrix); matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); } else if (mode == ZOOM) { float newDist = spacing(event); if (newDist > 10f) { matrix.set(savedMatrix); float scale = newDist / oldDist; matrix.postScale(scale, scale, mid.x, mid.y); } } break; } view.setImageMatrix(matrix); return true; } private float spacing(MotionEvent event) { float x = event.getX(0) - event.getX(1); float y = event.getY(0) - event.getY(1); return FloatMath.sqrt(x * x + y * y); } 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); } } " quality="high" allowscriptaccess="always" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer">

- public
class MulitPointTouchListener implements OnTouchListener { -
-
Matrix matrix = new Matrix(); -
Matrix savedMatrix = new Matrix(); -
-
public ImageView image; -
static final int NONE = 0; -
static final int DRAG = 1; -
static final int ZOOM = 2; -
int mode = NONE; -
-
PointF start = new PointF(); -
PointF mid = new PointF(); -
float oldDist = 1f; -
-
public MulitPointTouchListener(ImageView image) { -
super(); -
this.image = image; -
} -
-
@Override -
public boolean onTouch(View v, MotionEvent event) { -
this.image.setScaleType(ScaleType.MATRIX); -
-
ImageView view = (ImageView) v; -
// dumpEvent(event); -
-
switch (event.getAction() & MotionEvent.ACTION_MASK) { -
-
case MotionEvent.ACTION_DOWN: -
-
Log.w("FLAG", "ACTION_DOWN"); -
matrix.set(view.getImageMatrix()); -
savedMatrix.set(matrix); -
start.set(event.getX(), event.getY()); -
mode = DRAG; -
break; -
case MotionEvent.ACTION_POINTER_DOWN: -
Log.w("FLAG", "ACTION_POINTER_DOWN"); -
oldDist = spacing(event); -
if (oldDist > 10f) { -
savedMatrix.set(matrix); -
midPoint(mid, event); -
mode = ZOOM; -
} -
break; -
case MotionEvent.ACTION_UP: -
Log.w("FLAG", "ACTION_UP"); -
case MotionEvent.ACTION_POINTER_UP: -
Log.w("FLAG", "ACTION_POINTER_UP"); -
mode = NONE; -
break; -
case MotionEvent.ACTION_MOVE: -
Log.w("FLAG", "ACTION_MOVE"); -
if (mode == DRAG) { -
matrix.set(savedMatrix); -
matrix.postTranslate(event.getX() - start.x, event.getY() -
- start.y); -
} else if (mode == ZOOM) { -
float newDist = spacing(event); -
if (newDist > 10f) { -
matrix.set(savedMatrix); -
float scale = newDist / oldDist; -
matrix.postScale(scale, scale, mid.x, mid.y); -
} -
} -
break; -
} -
-
view.setImageMatrix(matrix); -
return true; -
} -
-
private float spacing(MotionEvent event) { -
float x = event.getX(0) - event.getX(1); -
float y = event.getY(0) - event.getY(1); -
return FloatMath.sqrt(x * x + y * y); -
} -
-
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); -
} -
}