DragFloatActionButton.java
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package com.shunzhi.parent.views;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.support.design.widget.FloatingActionButton;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
/**
* Created by ToaHanDong on 2018/3/15.
*/
public class DragFloatActionButton extends FloatingActionButton {
private int parentHeight;
private int parentWidth;
public DragFloatActionButton(Context context) {
super(context);
}
public DragFloatActionButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DragFloatActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
private int lastX;
private int lastY;
private boolean isDrag;
@Override
public boolean onTouchEvent(MotionEvent event) {
int rawX = (int) event.getRawX();
int rawY = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
setPressed(true);
isDrag = false;
getParent().requestDisallowInterceptTouchEvent(true);
lastX = rawX;
lastY = rawY;
ViewGroup parent;
if (getParent() != null) {
parent = (ViewGroup) getParent();
parentHeight = parent.getHeight();
parentWidth = parent.getWidth();
}
break;
case MotionEvent.ACTION_MOVE:
if (parentHeight <= 0 || parentWidth == 0) {
isDrag = false;
break;
} else {
isDrag = true;
}
int dx = rawX - lastX;
int dy = rawY - lastY;
//这里修复一些华为手机无法触发点击事件
int distance = (int) Math.sqrt(dx * dx + dy * dy);
if (distance == 0) {
isDrag = false;
break;
}
float x = getX() + dx;
float y = getY() + dy;
//检测是否到达边缘 左上右下
x = x < 0 ? 0 : x > parentWidth - getWidth() ? parentWidth - getWidth() : x;
y = getY() < 0 ? 0 : getY() + getHeight() > parentHeight ? parentHeight - getHeight() : y;
setX(x);
setY(y);
lastX = rawX;
lastY = rawY;
break;
case MotionEvent.ACTION_UP:
if (!isNotDrag()) {
//恢复按压效果
setPressed(false);
//Log.i("getX="+getX()+"；screenWidthHalf="+screenWidthHalf);
if (rawX >= parentWidth / 2) {
//靠右吸附
animate().setInterpolator(new DecelerateInterpolator())
.setDuration(500)
.xBy(parentWidth - getWidth() - getX())
.start();
} else {
//靠左吸附
ObjectAnimator oa = ObjectAnimator.ofFloat(this, "x", getX(), 0);
oa.setInterpolator(new DecelerateInterpolator());
oa.setDuration(500);
oa.start();
}
}
break;
}
//如果是拖拽则消s耗事件，否则正常传递即可。!isNotDrag() || super.onTouchEvent(event);
return true;
}
private boolean isNotDrag() {
return !isDrag && (getX() == 0
|| (getX() == parentWidth - getWidth()));
}
}