小编Arm*_*yan的帖子

你好，我试图实现一个泛型方法作为控制器基方法，但我无法理解的问题发生在泛型方法签名上。

<T> ResponseEntity<T> makeApiCall(String path, HttpMethod httpMethod, T body, boolean isAdmin){

        String sender = isAdmin ? adminHash : userHash;
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", sender);
        headers.add("Content-Type", "application/json");
        HttpEntity<T> entity = new HttpEntity<>(body,headers);
        ResponseEntity<T> responseEntity = restTemplate.exchange(path, HttpMethod.POST, entity, body.getClass());
        return responseEntity;
}

我目前的编译错误如下：

Incompatible equality constraint: T and capture of ? extends Object

我正在使用这个xml,它包含一个ListView和一个浮动操作按钮.我希望FAB始终位于右下角(但不要太靠近屏幕的边框),但它只适合列表的最后一项(所以当列表中有一个项目时,它就在右上角)

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.reminder.other_activities.AllSimpleRemindersActivity">

    <com.baoyz.swipemenulistview.SwipeMenuListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/simpleRems"
        android:dividerHeight="0dp"
        android:divider="@null"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true" />

    <RelativeLayout
        android:id="@+id/test"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </RelativeLayout>

    <android.support.design.widget.FloatingActionButton
        android:layout_margin="10dp"
        android:id="@+id/myFAB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:backgroundTint="#FF0000"
        app:borderWidth="0dp"
        app:elevation="8dp"
        app:layout_anchor="@id/test"
        app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>