androidx adaptation

android/src/main/java/com/idlefish/flutterboost/BoostRegistrar.java

@@ -2,7 +2,7 @@ package com.idlefish.flutterboost;
 
 import android.app.Activity;
 import android.content.Context;
-import android.support.annotation.NonNull;
+import androidx.annotation.NonNull;
 import io.flutter.Log;
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.embedding.engine.plugins.FlutterPlugin.FlutterPluginBinding;

android/src/main/java/com/idlefish/flutterboost/XAndroidKeyProcessor.java

 package com.idlefish.flutterboost;
 
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 

android/src/main/java/com/idlefish/flutterboost/XTextInputPlugin.java

 package com.idlefish.flutterboost;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import android.text.Editable;
 import android.text.InputType;
 import android.text.Selection;

android/src/main/java/com/idlefish/flutterboost/containers/FlutterActivityAndFragmentDelegate.java

@@ -2,7 +2,7 @@ package com.idlefish.flutterboost.containers;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
-import androidx.lifecycle.Lifecycle;
+import android.arch.lifecycle.LifeCycle;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Build;