Use code cache dir for engine cache on API >= 21 (#14704). (#8534)

shell/platform/android/io/flutter/util/PathUtils.java

@@ -5,6 +5,7 @@
 package io.flutter.util;
 
 import android.content.Context;
+import android.os.Build;
 
 public final class PathUtils {
     public static String getFilesDir(Context applicationContext) {
@@ -16,6 +17,10 @@ public final class PathUtils {
     }
 
     public static String getCacheDirectory(Context applicationContext) {
-        return applicationContext.getCacheDir().getPath();
+        if (Build.VERSION.SDK_INT >= 21) {
+            return applicationContext.getCodeCacheDir().getPath();
+        } else {
+            return applicationContext.getCacheDir().getPath();
+        }
     }
 }