textView的背景为白色的时候 需要加重影
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:shadowColor="#40000000"
android:shadowDx="0"
android:shadowDy="8"
android:shadowRadius="1"
android:layout_margin="20dip"
android:text="底部阴影效果"
android:textSize="20sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:shadowColor="#40000000"
android:shadowDx="0"
android:shadowDy="-5"
android:shadowRadius="1"
android:layout_margin="20dip"
android:text="顶部阴影"
android:textSize="20sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:shadowColor="#40000000"
android:shadowDx="-5"
android:shadowDy="0"
android:shadowRadius="1"
android:layout_margin="20dip"
android:text="左侧阴影"
android:textSize="20sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:shadowColor="#40000000"
android:shadowDx="5"
android:shadowDy="0"
android:shadowRadius="1"
android:layout_margin="20dip"
android:text="右侧阴影"
android:textSize="20sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:shadowColor="#40000000"
android:shadowDx="5"
android:shadowDy="5"
android:shadowRadius="1"
android:layout_margin="20dip"
android:text="右下侧阴影"
android:textSize="20sp"/>
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