Android(安卓)撕衣服Demo（OnTouchListener 应用）

1，布局

2，代码

【1】流程：

A，利用RelativeLayout 控件重叠的特性，设置两个image view

B，创建原图副本然后使用OnTaouchListener监听把移动的点变成透明

    //[1]获取我们要操作的原图        Bitmap srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pre19);        //[2]获取原图的副本        final Bitmap copyBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());        Paint paint = new Paint();        Canvas canvas = new Canvas(copyBitmap);        canvas.drawBitmap(srcBitmap, new Matrix(), paint);        //[3]把copybitmap的内容展示到iv上        iv.setImageBitmap(copyBitmap);        //[4]给iv设置触摸事件        iv.setOnTouchListener(new OnTouchListener(){                        @Override            public boolean onTouch(View v, MotionEvent event) {                switch (event.getAction()) {                case MotionEvent.ACTION_MOVE:  //移动                    //[5]当手指移动 让图片变透明                    for (int i = -15; i < 15; i++) {                        for (int j = -15; j < 15; j++) {                            //[6]市面上的一些应用撕了一个圆  为了良好的用户体验 撕一个圆                            if (Math.sqrt(i*i + j*j)<15) {                                try {                                    copyBitmap.setPixel((int)event.getX()+i,(int)event.getY()+j, Color.TRANSPARENT);                                    //[7]记得更新ui                                    iv.setImageBitmap(copyBitmap);                                } catch (Exception e) {                                }                            }                        }                    }                                                    break;                            }                return true;            }        });    }}

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