UI复习-布局管理器RelativeLayout(导航方向菜单)

package com.brady.est;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;

@SuppressLint("HandlerLeak")
public class MainActivity extends ActionBarActivity {

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

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.brady.est.MainActivity" >
<!-- 引入自定义组件
<com.brady.view.DrawView
android:layout_width="match_parent"
android:layout_height="match_parent"/>
-->

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="中间"
android:id="@+id/view1"
android:layout_centerInParent="true"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上边"
android:id="@+id/view2"
android:background="@drawable/button"
android:layout_above="@id/view1"
android:layout_alignLeft="@id/view1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下边"
android:id="@+id/view3"
android:background="@drawable/button"
android:layout_below="@id/view1"
android:layout_alignLeft="@id/view1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="左边"
android:id="@+id/view4"
android:background="@drawable/button"
android:layout_toLeftOf="@id/view1"
android:layout_alignTop="@id/view1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="右边"
android:id="@+id/view5"
android:background="@drawable/button"
android:layout_toRightOf="@id/view1"
android:layout_alignTop="@id/view1"
/>

</RelativeLayout>