R.java的有关问题

R.java的问题？
public static final class的“id/layout/string”都知道使用的去向了。

1）但attr和drawable却不知用到哪去了？

2）而且，怪异的是，BMI\res\drawable-hdpi BMI\res\drawable-mdpi BMI\res\drawable-ldpi都有一幅同名的png，但对应的id只有一个icon=0x7f020000。

3）如果说，attr是预留的，是不是意味着android的R的资源形式只有“attr/drawable/id/layout/string”五种了？

XML code

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */

package com.demo.android.bmi;

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int icon=0x7f020000;
    }
    public static final class id {
        public static final int height=0x7f050001;
        public static final int submit=0x7f050000;
        public static final int suggest=0x7f050003;
        public static final int weight=0x7f050002;
    }
    public static final class layout {
        public static final int main=0x7f030000;
    }
    public static final class string {
        public static final int advice_average=0x7f040001;
        public static final int advice_heavy=0x7f040002;
        public static final int advice_light=0x7f040000;
        public static final int app_name=0x7f040003;
        public static final int bmi_btn=0x7f040006;
        public static final int bmi_result=0x7f040007;
        public static final int height=0x7f040004;
        public static final int weight=0x7f040005;
    }
}

------解决方案--------------------
2）肯定是两个不同目录下的同一名字的Drawable的ID是相同的,因为这个两个目录中的文件是不能同时使用的,是系统根据屏幕的分辨率,自动选择使用哪个目录的.

R.java的有关问题

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