悬浮按钮

效果图

//将dp转换为px
public static int dip2px(Context context, float dpValue) {
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int) (dpValue * scale + 0.5f);
}

//浮动图片监听
private void initListener() {
    //弹出对话框
    jianwen.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            View view = LayoutInflater.from(getActivity()).inflate(R.layout.quick_layout, null);
            bbs = (TextView) view.findViewById(R.id.bbs);
            dailyattendance = (TextView) view.findViewById(R.id.dailyattendance);
            Jump.jumpToWeb(getActivity(), bbs, bbs.getText().toString(), Contents.MINE_LUNTAN_URL, false);
            Jump.jumpToWeb(getActivity(), dailyattendance, dailyattendance.getText().toString(), Contents.MINE_REGISTRATION_URL, false);
            
            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            builder.setView(view);
            AlertDialog dialog = builder.create();
            Window window = dialog.getWindow();
            WindowManager.LayoutParams attributes = window.getAttributes();
            attributes.alpha = 0.6f;    //设置对话框透明度
            attributes.gravity = Gravity.BOTTOM;     //设置对话框的位置
            attributes.width = LinearLayout.LayoutParams.MATCH_PARENT;
            window.setAttributes(attributes);
            dialog.show();
        }
    });


    //移动浮动图片
    jianwen.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int widthPixels = getResources().getDisplayMetrics().widthPixels;   //屏幕宽度
            int heightPixels = getResources().getDisplayMetrics().heightPixels;     //屏幕高度
            int width = v.getWidth();   //图片宽带
            int height = v.getHeight();     //图片高度
            switch (event.getAction()) {
                case MotionEvent.ACTION_MOVE:
                    //图片的绝对位置
                    float x = event.getRawX();
                    float y = event.getRawY();
                    //避免图片滑出屏幕
                    if (x > widthPixels - width) {
                        x = widthPixels - width;
                    }
                    if (y > heightPixels - height - dip2px(getContext(), 75)) {
                        y = heightPixels - height - dip2px(getContext(), 75);
                    }
                    v.setX(x);
                    v.setY(y);
                    break;
            }
            return false;   //表示还可以监听其他事件
        }
    });
}