按照网上资料学习了一下使用selector给按钮在focus和press的时候变色，但是报错了没法实现，很苦恼，请求各位帮助！！
activity_grid_view.xml //这个是我整个的布局文件 截图了使用到变换颜色的部分
```java
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<GridView
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:horizontalSpacing="2dp"
android:numColumns="2"
android:verticalSpacing="2dp"
android:focusable="true"
android:background="#ededed">
</GridView>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<View
android:layout_height="2dp"
android:layout_width="match_parent"
android:background="#ffffff" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3">
<Button
android:id="@+id/Button_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:drawableTop="@drawable/round_lightbulb_outline_black_18"
android:layout_marginTop="30dp"
android:text="打开手电筒"
android:background="@drawable/selector_btn_click_bg"
android:textSize="20sp"
android:focusable="true"
android:textColor="@drawable/selector_btn_click_text_color"></Button>
<Button
android:id="@+id/Button_2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:drawableTop="@drawable/outline_contactless_black_18"
android:layout_marginTop="30dp"
android:text="电话"
android:background="@drawable/selector_btn_click_bg"
android:textSize="20sp"
android:focusable="true"
android:textColor="@drawable/selector_btn_click_text_color"></Button>
<Button
android:id="@+id/Button_3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:drawableTop="@drawable/outline_account_circle_black_18"
android:layout_marginTop="33dp"
android:text="联系人"
android:background="@drawable/selector_btn_click_bg"
android:textSize="20sp"
android:focusable="true"
android:textColor="@drawable/selector_btn_click_text_color"></Button>
</LinearLayout>
selector_btn_click_bg.xml //变换按钮背景颜色
```java
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="false" android:drawable="@drawable/grey"/>
<item android:state_focused="true" android:color="@drawable/green"/>
<item android:state_pressed="false" android:color="@drawable/grey"/>
<item android:state_pressed="true" android:color="@drawable/green"/>
</selector>
selector_btn_click_text_color.xml //变换按钮字体颜色
```java
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="false" android:color="@color/black1"/>
<item android:state_focused="true" android:color="@color/white1"/>
<item android:state_pressed="false" android:color="@color/black1"/>
<item android:state_pressed="true" android:color="@color/white1"/>
</selector>
报错信息
