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本文实例为大家分享了android仿qq聊天消息气泡拖拽效果展示的具体代码，供大家参考，具体内容如下
先画圆，都会吧。代码如下：
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public class bezier extends view {
private final paint mgesturepaint = new paint();
private final path mpath = new path();
private float mx1 = 100, my1 = 150;
private float mx2 = 300, my2 = 150;
private boolean mbezier = true;
private int mradius = 30;
public bezier(context context, attributeset attrs) {
super(context, attrs);
mgesturepaint.setantialias(true);
mgesturepaint.setstyle(paint.style.fill_and_stroke);
mgesturepaint.setstrokewidth(5);
mgesturepaint.setcolor(color.red);
}
@override
protected void ondraw(canvas canvas) {
// todo auto-generated method stub
super.ondraw(canvas);
canvas.drawcircle(mx1, mx2, mradius, mgesturepaint);
}
}
效果
拖拽的另个一圆就不画了，效果的实现主要是计算两个点之间的拖拽区域，如下图：
求出区域之后，使用贝塞尔线画出效果就可以了，代码：
public class bezier extends view {
private final paint mgesturepaint = new paint();
private final path mpath = new path();
private float mx1 = 100, my1 = 150;
private float mx2 = 300, my2 = 150;
private boolean mbezier = true;
private int mradius = 30;
public bezier(context context, attributeset attrs) {
super(context, attrs);
mgesturepaint.setantialias(true);
mgesturepaint.setstyle(paint.style.fill_and_stroke);
mgesturepaint.setstrokewidth(5);
mgesturepaint.setcolor(color.red);
setbezier();
}
private void setbezier() {
float offsetx = (float) (mradius * math.sin(math.atan((my2 - my1) / (mx2 - mx1))));
float offsety = (float) (mradius * math.cos(math.atan((my2 - my1) / (mx2 - mx1))));
float x1 = mx1 - offsetx;
float y1 = my1 + offsety;
float x2 = mx2 - offsetx;
float y2 = my2 + offsety;
float x3 = mx2 + offsetx;
float y3 = my2 - offsety;
float x4 = mx1 + offsetx;
float y4 = my1 - offsety;
mpath.reset();
mpath.moveto(x1, y1);
mpath.quadto((mx1 + mx2) / 2, (my1 + my2) / 2, x2, y2);//锚点直接取偏移量的一半
mpath.lineto(x3, y3);
mpath.quadto((mx1 + mx2) / 2, (my1 + my2) / 2, x4, y4);
mpath.lineto(x1, y1);
}
@override
protected void ondraw(canvas canvas) {
// todo auto-generated method stub
super.ondraw(canvas);
//通过画布绘制多点形成的图形
canvas.drawcircle(mx1, my1, mradius, mgesturepaint);
if (mbezier) {
canvas.drawpath(mpath, mgesturepaint);
canvas.drawcircle(mx2, my2, mradius, mgesturepaint);
}
}
}
效果图：
拖拽效果只要在ontouchevent里动态改变拖动点的坐标重绘就可以实现了，代码：
public class bezier extends view {
private final paint mgesturepaint = new paint();
private final path mpath = new path();
private float mx1 = 100, my1 = 150;
private float mx2 = 300, my2 = 150;
private boolean mbezier = true;
private int mradius = 30;
public bezier(context context, attributeset attrs) {
super(context, attrs);
mgesturepaint.setantialias(true);
mgesturepaint.setstyle(paint.style.fill_and_stroke);
mgesturepaint.setstrokewidth(5);
mgesturepaint.setcolor(color.red);
setbezier();
}
private void setbezier() {
float offsetx = (float) (mradius * math.sin(math.atan((my2 - my1) / (mx2 - mx1))));
float offsety = (float) (mradius * math.cos(math.atan((my2 - my1) / (mx2 - mx1))));
float x1 = mx1 - offsetx;
float y1 = my1 + offsety;
float x2 = mx2 - offsetx;
float y2 = my2 + offsety;
float x3 = mx2 + offsetx;
float y3 = my2 - offsety;
float x4 = mx1 + offsetx;
float y4 = my1 - offsety;
mpath.reset();
mpath.moveto(x1, y1);
mpath.quadto((mx1 + mx2) / 2, (my1 + my2) / 2, x2, y2);//锚点直接取偏移量的一半
mpath.lineto(x3, y3);
mpath.quadto((mx1 + mx2) / 2, (my1 + my2) / 2, x4, y4);
mpath.lineto(x1, y1);
}
@override
protected void ondraw(canvas canvas) {
// todo auto-generated method stub
super.ondraw(canvas);
//通过画布绘制多点形成的图形
canvas.drawcircle(mx1, my1, mradius, mgesturepaint);
if (mbezier) {
canvas.drawpath(mpath, mgesturepaint);
canvas.drawcircle(mx2, my2, mradius, mgesturepaint);
}
}
@override
public boolean ontouchevent(motionevent event) {
mx2 = event.getx();
my2 = event.gety();
switch (event.getaction()) {
case motionevent.action_down:
mbezier = true;
setbezier();
break;
case motionevent.action_move:
mbezier = true;
setbezier();
break;
case motionevent.action_up:
mbezier = false;
break;
}
invalidate();
return true;
}
}
源码：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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