Android 向RecyclerVIew中的选定项目添加自定义形状

如何在recyclerview中将自定义形状显示为选定项目后面的背景。我尝试过几种方法，但都失败了：

活动\u main.xml:

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/nav_drawer_recycler_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/drawer_background"
                android:theme="@style/drawer"></android.support.v7.widget.RecyclerView>

        </LinearLayout>

 <?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/drawable_shape_selected" android:state_checked="true"></item>
    <item android:drawable="@android:color/transparent"></item>
</selector>

 <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#FFB74D"></solid>

</shape>

---

像这样更改您的

drawer\u background.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/drawable_shape_selected"
          android:state_pressed="true" />
    <item android:drawable="@drawable/drawable_shape_selected"
          android:state_focused="true" />
    <item android:drawable="@android:color/transparent" />
</selector>

---

谢谢如果我想在这个形状后面添加阴影呢。你最欢迎的..阴影可以用xml添加，也可以通过创建自定义类..查看此链接以获取答案。。。兄弟此focusableInTouchMode已锁定recyclerView first click，它仅在第二次clickbro时有效更新代码..立即检查..这将解决您的问题：）将其添加到您的viewholder中

itemView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean b) {
                Toast.makeText(context, "Position " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
            }
        });

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/drawable_shape_selected"
          android:state_pressed="true" />
    <item android:drawable="@drawable/drawable_shape_selected"
          android:state_focused="true" />
    <item android:drawable="@android:color/transparent" />
</selector>

Button button = view.findViewById(R.id.buttonPanel2);
button.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean focus) {
                if(focus){
                   view.performClick();
                }
             }
        });