Re-organize classes

app/src/main/java/com/topjohnwu/magisk/FlashActivity.java

@@ -16,9 +16,9 @@ import android.widget.TextView;
 import com.topjohnwu.magisk.asyncs.FlashZip;
 import com.topjohnwu.magisk.asyncs.InstallMagisk;
 import com.topjohnwu.magisk.components.Activity;
+import com.topjohnwu.magisk.container.AdaptiveList;
 import com.topjohnwu.magisk.utils.Shell;
 
-import java.util.ArrayList;
 import java.util.List;
 
 import butterknife.BindView;
@@ -150,34 +150,4 @@ public class FlashActivity extends Activity {
         }
     }
 
-    public static class AdaptiveList<E> extends ArrayList<E> {
-
-        private Runnable callback;
-        private RecyclerView mView;
-
-        public AdaptiveList(RecyclerView v) {
-            mView = v;
-        }
-
-        public void updateView() {
-            mView.getAdapter().notifyDataSetChanged();
-            mView.scrollToPosition(mView.getAdapter().getItemCount() - 1);
-        }
-
-        public void setCallback(Runnable cb) {
-            callback = cb;
-        }
-
-        public boolean add(E e) {
-            boolean ret = super.add(e);
-            if (ret) {
-                if (callback == null) {
-                    updateView();
-                } else {
-                    callback.run();
-                }
-            }
-            return ret;
-        }
-    }
 }