dragView
因项目新需求需要添加一个屏幕拖拽按钮可以弹出菜单的控件,因为不是我做的闲来无事写一个demo吧 可能存在一些小bug(毕竟就写了几个小时)兄弟姐妹们理解思路就行 具体的可以自己调试一下 废话不多说先来一个gif走一走(调了帧数 可能看着比较快 不要介意)
GitHub 传送车https://github.com/guanhaoran/dragView
gif有点小 对付看吧 (太大了传github的时候 会出错 放图片还看不出来效果 不要介意)
Markdown
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废话不多话直接看代码
1.写一个类继承 Button 重写构造方法&onTouchEvent(MotionEvent event)
public DragView(Context context) {
this(context, null); }
public DragView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DragView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
//获取屏幕宽高，用于控制控件在屏幕内移动
DisplayMetrics dm = getResources().getDisplayMetrics();
mScreenWidth = dm.widthPixels;
mScreenHeight = dm.heightPixels - 100;//这里减去的100是下边的back键和menu键那一栏的高度，看情况而定
showPopup = new ShowPopup(context);
}
2.onTouchEvent(MotionEvent event)
大家可能看的不太懂 先大体看下结构 稍后我会在代码里加上注释 确保每条代码都有注释一些没有的 我就不会加注释 也浪费大家时间
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
int lastMoveX = 0;
int lastMoveY = 0;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
falg = true;
startDownX = (int) event.getRawX();
startDownY = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
if (showPopup.isShowing()) {
showPopup.dissPopup();
}
lastMoveX = (int) event.getRawX();
lastMoveY = (int) event.getRawY();
int dx = lastMoveX - startDownX;
int dy = lastMoveY - startDownY;
if (Math.abs(dx) > 2 || Math.abs(dy) > 2) {
falg = false;
}
left = getLeft() + dx;
top = getTop() + dy;
right = getRight() + dx;
bottom = getBottom() + dy;
if (left < 0) {
left = 0;
right = left + getWidth();
}
if (right > mScreenWidth) {
right = mScreenWidth;
left = right - getWidth();
}
if (top < 0) {
top = 0;
bottom = top + getHeight();
}
if (bottom > mScreenHeight) {
bottom = mScreenHeight;
top = bottom - getHeight();
}
layout(left, top, right, bottom);
Log.i("____________________", left + "___" + top + "___" + right + "___" + bottom);
invalidate();
startDownX = (int) event.getRawX();
startDownY = (int) event.getRawY();
break;
case MotionEvent.ACTION_UP:
int lastMoveDx = Math.abs((int) event.getRawX() - startDownX);
int lastMoveDy = Math.abs((int) event.getRawY() - startDownY);
if (falg) {
ToastUtils.showToast(context, "我点击了");
showContent(360, true);
}
falg = false;
break;
}
return true;
3.点击按钮出现的一个小圆点 这个使用popupWindow做的包括背景颜色变暗也是在popupWindow中实现的 这个稍后也会有注释 我只是写完了 不喜欢写注释
(这个毛病很坏 - -)
private void showContent(int angles, boolean isShow) {
if (showPopup.isShowing()) {
showPopup.dissPopup();
} else {
int excursionX = -(getWidth() / 2) - 5;
int excursionY = 0;
if (left == 0 && right == 0 && top == 0 && bottom == 0) {
excursionX = -(getWidth() / 2)-5;
excursionY = 0;
} else if (left < 50 && top < 50) {
excursionX = getWidth();
excursionY = 0;
} else if (mScreenWidth - right < 50 && top < 50) {
excursionX = -getWidth() * 2 - 20;
excursionY = 0;
} else if (mScreenWidth - right < 50 && mScreenHeight - bottom < getHeight()*2) {
excursionX = -getWidth() * 2 - 20;
excursionY = -getHeight() * 3 - 20;
} else if (mScreenHeight - bottom < getHeight()*2 && left < 50) {
excursionX = getWidth();
excursionY = -getHeight() * 3 - 20;
} else if (left < 50) {
excursionX = getWidth();
excursionY = -getHeight() - getHeight() / 2;
} else if (top < 50) {
excursionX = -(getWidth() / 2)-10;
excursionY = -10;
} else if (mScreenWidth - right < 50) {
excursionX = -getWidth() * 2 - 10;
excursionY = -getHeight() - getHeight() / 2 - 10;
} else if (mScreenHeight - bottom < getHeight() * 2.5) {
excursionX = -getWidth() / 2 -10;
excursionY = -getHeight() * 3 - 10;
} else {
}
showPopup.showPopup(this, excursionX, excursionY);
}
}
4.还有一个popupWindow 我就不贴在这里了 大家可以看代码就好了,可能代码包结构很乱大家不要介意,我也是为了效果别的我也没注意
- 最后我在上传GitHub的时候 哇!!!很痛苦 全是英文(奈何我的英文还不好)传了好久才传上去 下一篇文章我会把GitHub的使用给兄弟们详详细细的说一遍
- GitHub 传送车https://github.com/guanhaoran/dragView
QQ:765307272
