标签：
paint触摸轨迹监听，主要是三种而已，ACTION_DOWN，ACTION_MOVE，ACTION_UP
public boolean onTouchEvent(MotionEvent event){ int action = event.getAction(); float x = event.getX(); float y = event.getY(); switch(action){ case MotionEvent.ACTION_DOWN: mPath.moveTo(x, y); break; case MotionEvent.ACTION_MOVE: mPath.quadTo(mPosX, mPosY, x, y); break; case MotionEvent.ACTION_UP: //mPath.reset(); break; } //记录当前触摸点得当前得坐标 mPosX = x; mPosY = y; return true; }
但是触摸绘制轨迹有两种效果，一种是手指移动完毕，轨迹出现，那么设置在ACTION_UP中：在ACTION_UP中绘制cacheCanvas.drawPath(path, paint);
public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN : { cur_x = x; cur_y = y; path.moveTo(cur_x, cur_y); isMoving = true; break; } case MotionEvent.ACTION_MOVE : { if (!isMoving) break; // 二次曲线方式绘制 path.quadTo(cur_x, cur_y, x, y); // cacheCanvas.drawPath(path, paint); // 下面这个方法貌似跟上面一样 // path.lineTo(x, y); cur_x = x; cur_y = y; break; } case MotionEvent.ACTION_UP : { // 鼠标弹起保存最后状态 cacheCanvas.drawPath(path, paint); path.reset(); isMoving = false; break; } }
第二种是触摸的时候显示绘制轨迹，那么就在ACTION_MOVE中设置：cacheCanvas.drawPath(path, paint);
public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN : { cur_x = x; cur_y = y; path.moveTo(cur_x, cur_y); isMoving = true; break; } case MotionEvent.ACTION_MOVE : { if (!isMoving) break; // 二次曲线方式绘制 path.quadTo(cur_x, cur_y, x, y); cacheCanvas.drawPath(path, paint); // 下面这个方法貌似跟上面一样 // path.lineTo(x, y); cur_x = x; cur_y = y; break; } case MotionEvent.ACTION_UP : { // 鼠标弹起保存最后状态 // cacheCanvas.drawPath(path, paint); path.reset(); isMoving = false; break; } }
标签：
原文地址：http://www.cnblogs.com/Anita9002/p/4341307.html
