1、java代码

/**
 * Created by guc on 2018/6/4.
 * 描述：无任务管理
 */
public class NoTaskUtil {
    private static PopupWindow popupWindow;

    /**
     * 显示无任务布局
     *
     * @param activity
     * @param rootView
     */
    public static void showNoTaskView(final Activity activity, View rootView) {
        final View rootContentView = LayoutInflater.from(activity).inflate(R.layout.layout_notask, null);
        if (popupWindow != null && popupWindow.isShowing()) {
            popupWindow.dismiss();
        }
        popupWindow = new PopupWindow(rootContentView, LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        popupWindow.setBackgroundDrawable(new ColorDrawable());
        popupWindow.setOutsideTouchable(false);
        popupWindow.setTouchable(true);
        popupWindow.setFocusable(false);
        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {

            }
        });
        popupWindow.showAtLocation(rootView == null ? activity.getWindow().getDecorView() : rootView, Gravity.CENTER, 0, -SizeUtils.dp2px(50));
        rootContentView.findViewById(R.id.iv_notask).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
    }

    /**
     * 隐藏
     */
    public static void hideNoTaskView() {
        if (popupWindow != null) {
            popupWindow.dismiss();
            popupWindow = null;
        }
    }

2、空数据布局 layout_notask.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_root_no_task"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/ll_notask"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/iv_notask"
            android:layout_width="@dimen/dimen_100dp"
            android:layout_height="@dimen/dimen_100dp"
            android:src="@drawable/default_notask" />

        <TextView
            style="@style/StyleCommonText.Gray"
            android:layout_gravity="center_horizontal"
            android:text="暂无数据"
            android:textSize="14sp" />

    </LinearLayout>

</RelativeLayout>

3、使用方法

无数据时，调用 NoTaskUtil.showNoTaskView(this, rooView); 即可