修改namespace

android/build.gradle

@@ -22,6 +22,7 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
+    namespace = "io.flutter.plugins.deviceinfo"
     compileSdkVersion 29
 
     defaultConfig {

android/src/main/AndroidManifest.xml

-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="io.flutter.plugins.deviceinfo">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 </manifest>