android笔记四RelativeLayout

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/RelativeLayout01"
    android:gravity="center"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ImageView
        android:id="@+id/ImageView01"
        android:background="@drawable/center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        />
    <ImageView
        android:id="@+id/ImageView02"
        android:background="@drawable/right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/ImageView01"
        android:layout_alignTop="@id/ImageView01"
        />
    <ImageView
        android:id="@+id/ImageView03"
        android:background="@drawable/up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/ImageView01"
        android:layout_alignLeft="@id/ImageView01"
        />
    <ImageView
        android:id="@+id/ImageView04"
        android:background="@drawable/down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/ImageView01"
        android:layout_alignLeft="@id/ImageView01"
        />
    <ImageView
        android:id="@+id/ImageView05"
        android:background="@drawable/left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@id/ImageView01"
        android:layout_alignTop="@id/ImageView01"
        />
</RelativeLayout>

MainActivity.java

package com.example.frametest;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}