fix the leak

android/build.gradle

@@ -22,7 +22,7 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 28
     buildToolsVersion '27.0.3'
     defaultConfig {
         minSdkVersion 16

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

@@ -54,7 +54,7 @@ public class BoostFlutterView extends FrameLayout {
     private BoostFlutterEngine mFlutterEngine;
 
     private XFlutterView mFlutterView;
-    private PlatformPlugin mPlatformPlugin;
+    private XPlatformPlugin mPlatformPlugin;
 
     private Bundle mArguments;
 
@@ -114,7 +114,7 @@ public class BoostFlutterView extends FrameLayout {
         if (mArguments == null) {
             mArguments = new Bundle();
         }
-        mPlatformPlugin = new PlatformPlugin((Activity) getContext(), mFlutterEngine.getPlatformChannel());
+        mPlatformPlugin = new XPlatformPlugin((Activity) getContext(), mFlutterEngine.getPlatformChannel());
 
         mFlutterView = new XFlutterView(getContext(), getRenderMode(), getTransparencyMode());
         addView(mFlutterView, new FrameLayout.LayoutParams(
@@ -295,6 +295,7 @@ public class BoostFlutterView extends FrameLayout {
 
         mFlutterView.removeOnFirstFrameRenderedListener(mOnFirstFrameRenderedListener);
         mFlutterView.release();
+        mPlatformPlugin.release();
     }
 
     //混合栈的返回和原来Flutter的返回逻辑不同

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

@@ -13,6 +13,7 @@ public class XAndroidKeyProcessor {
     private final KeyEventChannel keyEventChannel;
     @NonNull
     private final XTextInputPlugin textInputPlugin;
+
     private int combiningCharacter;
 
     public XAndroidKeyProcessor(@NonNull KeyEventChannel keyEventChannel, @NonNull XTextInputPlugin textInputPlugin) {
@@ -20,6 +21,7 @@ public class XAndroidKeyProcessor {
         this.textInputPlugin = textInputPlugin;
     }
 
+
     public void onKeyUp(@NonNull KeyEvent keyEvent) {
         Character complexCharacter = applyCombiningCharacterToBaseCharacter(keyEvent.getUnicodeChar());
         keyEventChannel.keyUp(