Android2.2.3 实现多点缩放功能：
// 触摸事件 @Override public boolean onTouchEvent(MotionEvent event) { if (false == this.is_initialized()) { return false; } try { PointF point_s = new PointF(); point_s.x = event.getX(); point_s.y = event.getY(); int x = (int) point_s.x;// Float.to( event.getX() ); int y = (int) point_s.y;// Float.floatToIntBits( event.getY() ); switch (event.getAction() & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: m_pressPt.set(x, y); mode = DRAG; break; case MotionEvent.ACTION_UP: if (mode == DRAG) { int px = x - m_pressPt.x; int py = y - m_pressPt.y; if (px != 0 && py != 0) { m_naviEngine.SetCenter(480 - px, 270 - py); } } mode = NONE; break; case MotionEvent.ACTION_POINTER_UP: if (mode == ZOOM) { float newDist = spacing(event); if (newDist > 10f) { float scale = newDist - oldDist; if (scale > 0) { m_levelIndex = getLevelIndex(); // 设置当前比例尺 if (m_levelIndex < m_level.length - 1) { m_levelIndex++; m_naviEngine.SetLevel(m_level[m_levelIndex]); m_btnZoomOut.setEnabled(true); if (m_levelIndex == m_level.length - 1) { m_btnZoomIn.setEnabled(false); } // 更新信息弹出框 // showPopSign(); } } else { m_levelIndex = getLevelIndex(); // 设置当前比例尺以及按钮状态 if (m_levelIndex > 0) { m_levelIndex--; m_naviEngine.SetLevel(m_level[m_levelIndex]); m_btnZoomIn.setEnabled(true); if (m_levelIndex == 0) { m_btnZoomOut.setEnabled(false); } // 更新信息弹出框 // showPopSign(); } } } } break; case MotionEvent.ACTION_POINTER_DOWN: oldDist = spacing(event); if (oldDist > 10f) { mode = ZOOM; } break; } } catch (UnsatisfiedLinkError e) { return false; } return m_gestureScanner.onTouchEvent(event); }