Why is my Android App crashing when I'm trying to access string resources?

I'm doing the HelloLinearLayout tutorial, but using string resources instead of hard coding the strings directly into the XML like the tutorial. When I run the app using string resources, it crashes immediately. When I hard code the strings into the XML code, everything works fine. Any ideas as to why my app is crashing? Thanks

Main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent">

    <LinearLayout 
        android:orientation="horizontal"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"
        android:layout_weight="1">
            <TextView
                android:text="@string/box1text"
                android:gravity="center_horizontal"
                android:background="@string/box1color"
                android:layout_height="fill_parent"
                android:layout_width="wrap_content"
                android:layout_weight="@string/box1weight"
                />
            <TextView
                android:text="@string/box2text"
                android:gravity="center_horizontal"
                android:background="@string/box2color"
                android:layout_height="fill_parent"
                android:layout_width="wrap_content"
                android:layout_weight="@string/box2weight"
                />
            <TextView
                android:text="@string/box3text"
                android:gravity="center_horizontal"
                android:background="@string/box3color"
                android:layout_height="fill_parent"
                android:layout_width="wrap_content"
                android:layout_weight="@string/box2weight"
                />
            <TextView
                android:text="@string/box4text"
                android:gravity="center_horizontal"
                android:background="@string/box4color"
                android:layout_height="fill_parent"
                android:layout_width="wrap_content"
                android:layout_weight="@string/box4weight"
                />
            </LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
    <resources>
        <string name="hello">Hello World, HelloLinearLayoutActivity!</string>
        <string name="app_name">HelloLinearLayout</string>
        <string name="box1text">red</string>
        <string name="box1color">#aa0000</string>
        <string name="box1weight">1</string>
        <string name="box2text">green</string>
        <string name="box2color">#00aa00</string>
        <string name="box2weight">1</string>
        <string name="box3text">blue</string>
        <string name="box3color">#0000aa</string>
   开发者_StackOverflow社区     <string name="box3weight">1</string>
        <string name="box4text">yellow</string>
        <string name="box4color">#aaaa00</string>
        <string name="box4weight">1</string>
    </resources>

hellolinearlayoutactivity.java

package com.example.hellolinearlayout;

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

public class HelloLinearLayoutActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

You can not set background color as strings. Create an XML file at res/values/colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <color name="opaque_red">#f00</color>
   <color name="translucent_red">#80ff0000</color>
  <color name="box4color">#aaaa00</color>
</resources>

Then use like below.

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@color/box4color"
    android:textColor="@color/translucent_red"
    android:text="Hello"/>

I this this is because of the android:background="@string/box1color". Why because the background attribute accommodate the integer values in the form of HEXADECIMAL .But you used string resources. I think this is the problem. But I am not sure... As per my knowledge i guessed this. If this content have wrong information please excuse.