paint觸摸軌跡監聽，主要是三種而已，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;}//記錄當前觸摸點得當前得坐標mPosX = x;mPosY = y; return true; }

但是觸摸繪制軌跡有兩種效果，一種是手指移動完畢，軌跡出現，那么設置在ACTION_UP中：在ACTION_UP中繪制cacheCanvas.drawPath(path, paint);

public boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubfloat 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;// 二次曲線方式繪制 path.quadTo(cur_x, cur_y, x, y);// cacheCanvas.drawPath(path, paint);// 下面這個方法貌似跟上面一樣// path.lineTo(x, y);cur_x = x;cur_y = y;break;}case MotionEvent.ACTION_UP : {// 鼠標彈起保存最后狀態 cacheCanvas.drawPath(path, paint);path.reset();isMoving = false;break;}}

第二種是觸摸的時候顯示繪制軌跡，那么就在ACTION_MOVE中設置：cacheCanvas.drawPath(path, paint);

public boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubfloat 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;// 二次曲線方式繪制 path.quadTo(cur_x, cur_y, x, y);cacheCanvas.drawPath(path, paint);// 下面這個方法貌似跟上面一樣// path.lineTo(x, y);cur_x = x;cur_y = y;break;}case MotionEvent.ACTION_UP : {// 鼠標彈起保存最后狀態// cacheCanvas.drawPath(path, paint); path.reset();isMoving = false;break;}}

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轉載于:https://www.cnblogs.com/Anita9002/p/4341307.html

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