Android悬浮贴边按钮实现（含动画效果）

效果图

代码实现

package com.dingo.newexproration.ui;

import android.animation.ObjectAnimator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
import android.view.MotionEvent;

import com.dingo.newexproration.R;

public class FloatButton extends AppCompatImageView {

    /**
     * View的宽高
     */
    private int width;
    private int height;

    /**
     * 触摸点相对于View的坐标
     */
    private float touchX;
    private float touchY;

    /**
     * x,y坐标的纠正值
     * 考虑到一些异性屏和非标准的显示区域
     */
    int xCorrection = 0;
    int yCorrection = 0;

    public void