我们的应用在登录后立即占用最多60MB（MainActivity执行setContentView(R.layout.mainActivity);时）
最近我们将活动更新为AppCompatActivity。我注意到这个改变增加了大约30MB的RAM（该应用程序现在在登录后立即占用90MB RAM。）
我通过回复Activity并确认内存减少来确认这一点。
为什么会这样？这是否意味着我在使用AppCompatActivity时做错了什么？
我还尝试将所有UI组件更改为AppCompat（TextView到AppCompatTextView，ImageView到AppCompatImageView等等。）但我没有看到任何差异。
任何建议都将不胜感激。
修改
添加MainActivity的布局xml：
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mainActivity"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@drawable/background"
android:focusable="true"
android:focusableInTouchMode="true"
android:padding="15dip" >
<ImageButton
android:id="@+id/selectContactBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="contacts"
android:src="@drawable/select_contact_enabled"
android:textSize="18sp"
android:layout_above="@+id/selectMediaBtn"
android:layout_alignRight="@+id/selectMediaBtn"
android:layout_alignEnd="@+id/selectMediaBtn" />
<TextView
android:id="@+id/destName"
android:layout_width="175dp"
android:layout_height="wrap_content"
android:layout_below="@+id/CallNumber"
android:layout_alignLeft="@+id/CallNumber"
android:layout_alignStart="@+id/CallNumber"
android:layout_alignRight="@+id/CallNumber"
android:layout_alignEnd="@+id/CallNumber"
android:textStyle="bold" />
<ImageButton
android:id="@+id/selectMediaBtn"
android:layout_width="300dp"
android:layout_height="220dp"
android:contentDescription="mypic"
android:clickable="true"
android:src="@drawable/mediaicon"
android:textSize="18sp"
android:layout_above="@+id/CallNow"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageButton
android:id="@+id/inviteButton"
android:layout_width="300dp"
android:layout_height="220dp"
android:contentDescription="invite "
android:clickable="false"
android:src="@drawable/invite"
android:textSize="18sp"
android:layout_above="@+id/CallNow"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:visibility="invisible" />
<AutoCompleteTextView
android:id="@+id/CallNumber"
android:layout_width="175dp"
android:layout_height="wrap_content"
android:ems="10"
android:enabled="true"
android:hint="To...."
android:focusable="true"
android:focusableInTouchMode="true"
android:phoneNumber="true"
android:maxLength="10"
android:singleLine="true"
android:completionThreshold="1"
android:inputType="textAutoComplete|text"
android:layout_alignTop="@+id/selectContactBtn"
android:layout_alignLeft="@+id/selectMediaBtn"
android:layout_alignStart="@+id/selectMediaBtn"
android:layout_alignRight="@+id/userStatusPositive"
android:layout_alignEnd="@+id/userStatusPositive">
<requestFocus />
</AutoCompleteTextView>
<Button
android:id="@+id/CallNow"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:enabled="true"
android:textSize="18sp"
android:text="Call Now"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
<ImageButton
android:id="@+id/selectProfileMediaBtn"
android:contentDescription="mypic"
android:clickable="true"
android:src="@drawable/avatar"
android:layout_width="200dp"
android:layout_height="120dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="@+id/CallNumber"
android:layout_alignLeft="@+id/CallNumber"
android:layout_alignStart="@+id/CallNumber"
android:background="@android:color/transparent" />
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/progressBar"
android:layout_alignParentTop="true"
android:layout_alignLeft="@+id/selectContactBtn"
android:layout_alignStart="@+id/selectContactBtn"
android:layout_marginTop="49dp" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/clear"
android:clickable="true"
android:background="@drawable/clear"
android:layout_alignBottom="@+id/CallNumber"
android:layout_toRightOf="@+id/CallNumber"
android:layout_toEndOf="@+id/CallNumber" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="RingTone Name "
android:id="@+id/ringtoneName"
android:visibility="invisible"
android:background="@android:color/white"
android:textColor="@android:color/black"
android:singleLine="true"
android:hint="No Ringtone Was Chosen !"
android:layout_above="@+id/CallNow"
android:layout_alignLeft="@+id/selectMediaBtn"
android:layout_alignStart="@+id/selectMediaBtn"
android:layout_alignRight="@+id/selectContactBtn"
android:layout_alignEnd="@+id/selectContactBtn" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/userStatusPositive"
android:layout_alignBottom="@+id/CallNumber"
android:layout_alignTop="@+id/CallNumber"
android:layout_alignRight="@+id/CallNow"
android:layout_alignEnd="@+id/CallNow"
android:layout_alignLeft="@+id/CallNow"
android:layout_alignStart="@+id/CallNow"
android:src="@drawable/positive"
android:visibility="invisible" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/userStatusNegative"
android:layout_alignBottom="@+id/CallNumber"
android:layout_alignTop="@+id/CallNumber"
android:layout_alignRight="@+id/CallNow"
android:layout_alignEnd="@+id/CallNow"
android:layout_alignLeft="@+id/CallNow"
android:layout_alignStart="@+id/CallNow"
android:src="@drawable/negative"
android:visibility="invisible" />
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/fetchuserprogress"
android:layout_alignBottom="@+id/CallNumber"
android:layout_toLeftOf="@+id/clear"
android:layout_alignTop="@+id/CallNumber"
android:layout_alignRight="@+id/CallNumber"
android:layout_alignEnd="@+id/CallNumber"
android:layout_alignLeft="@+id/CallNow"
android:layout_alignStart="@+id/CallNow"
android:visibility="gone" />
<ImageView
android:layout_width="@dimen/sb__text_size"
android:layout_height="@dimen/sb__text_size"
android:id="@+id/mediaStatusArrived"
android:layout_above="@+id/ringtoneName"
android:layout_alignRight="@+id/selectMediaBtn"
android:layout_alignEnd="@+id/selectMediaBtn"
android:visibility="invisible"
android:layout_marginRight="@dimen/sb__text_size"
android:src="@drawable/doublepositive" />
<ImageView
android:layout_width="@dimen/sb__text_size"
android:layout_height="@dimen/sb__text_size"
android:id="@+id/ringtoneStatusArrived"
android:visibility="invisible"
android:layout_alignBottom="@+id/selectMediaBtn"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="@dimen/sb__text_size"
android:src="@drawable/doublepositive" />
</RelativeLayout>
<ListView
android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#ffff"/>
</android.support.v4.widget.DrawerLayout>