点击一个图片更换成另一个图片，并且弹出popupwindow

第一步：在那个id中

case R.id.supmart_img:

    if (v == supmart_img) {
        if (isChanged) {
            supmart_img.setImageDrawable(getResources().getDrawable(R.mipmap.yuan));

        } else {
            showPopUp(v);
            supmart_img.setImageDrawable(getResources().getDrawable(R.mipmap.seyuan));


        }
        isChanged = !isChanged;

    }

    break;

boolean isChanged = false;

private void showPopUp(View parent) {
    view2 = LayoutInflater.from(SupmartActivity.this).inflate(R.layout.popu2, null);
    popupWindow = new PopupWindow(view2, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    // 获取popwindow焦点
    popupWindow.setFocusable(true);
    // 点击PopupWindow区域外部消失
    popupWindow.setOutsideTouchable(true);
    popupWindow.setBackgroundDrawable(new BitmapDrawable());
    // 设置popwindow出现和消失动画
    // popupWindow.setAnimationStyle(R.style.PopMenuAnimation);
    // 获取点击按钮的坐标
    int[] location = new int[2];
    supmart_img.getLocationOnScreen(location);
    // 设置popwindow显示位置
    popupWindow.showAtLocation(supmart_img, Gravity.NO_GRAVITY, location[0], location[1] - popupWindow.getHeight());
    popupWindow.showAsDropDown(supmart_img);

}

第二步：popup2布局中

<LinearLayout
    android:background="@color/colorPrimary"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="50dp">

        <Button
            android:background="#0000"
            android:id="@+id/xiaoxingquan"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15px"
            android:button="@null"
            android:layout_weight="1"
            android:text="水果"
            android:textColor="#cd333333" />



        <Button
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15px"
            android:button="@null"
            android:background="#0000"
            android:text="香烟"
            android:textColor="#cd333333" />


        <Button
            android:background="#0000"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15px"
            android:button="@null"
            android:layout_weight="1"
            android:text="酒水"
            android:textColor="#cd333333" />

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15px"
            android:button="@null"
            android:layout_weight="1"
            android:text="蔬菜"
            android:background="#0000"
            android:textColor="#cd333333" />



        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15px"
            android:button="@null"
            android:layout_weight="1"
            android:text="冷饮"
            android:background="#0000"
            android:textColor="#cd333333" />



</LinearLayout>