布局文件问题：布局文件eclipse插件显示正常，模拟器中显示不正常

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

                xmlns:snake="http://schemas.android.com/apk/res/com.android.gstar"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent" >

      <com.android.gstar.SnakeView

            android:id="@+id/snake"

            android:layout_width="fill_parent"

            android:layout_height="fill_parent"

            snake:tileSize="24" />

  <RelativeLayout 

      android:layout_width="fill_parent"

      android:layout_height="fill_parent"

      

      >

        <Button

            android:id="@+id/up"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginTop="50px"

            android:layout_alignParentRight="true"

            android:layout_marginRight="100px"

            android:background="@drawable/up"

            ></Button>

        

       <Button

            android:id="@+id/down"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_below="@id/up" 

            android:layout_alignRight="@id/up"

            android:layout_marginTop="50px"            

            android:background="@drawable/down"

            

            ></Button>

          <Button

            android:id="@+id/left"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentRight="true"

            android:layout_below="@id/up"

            android:layout_marginTop="18px"

            android:layout_marginRight="140px"

            android:background="@drawable/left"

            ></Button>

        <Button 

            android:id="@+id/play"

            android:layout_centerHorizontal="true"

            android:layout_centerVertical="true"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Press to start game"

            ></Button>



        <Button

            android:id="@+id/right"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignBaseline="@id/left"

            android:layout_alignBottom="@id/left"

            android:layout_toRightOf="@id/down"

            android:background="@drawable/right" />



      </RelativeLayout>



</FrameLayout>

//		up=(Button)findViewById(R.id.up);

//		up.setOnClickListener(this);

//		up.setId(UP);

补充：移动开发 ,  Android

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