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);
    }
}

布局XML文件:

<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>

界面: