有一个资源跟系统上的一个资源相同，想要引用它：frameworks/base/core/res/res/drawable/ic_text_dot.xml
文件名称：ic_text_dot.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2014 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:inset="10dp">
<shape android:shape="oval">
<solid android:color="?android:attr/textColorSecondary" />
<size android:width="4dp" android:height="4dp" />
</shape>
</inset>
但是不知道为什么，我在项目中用Java代码调用这个资源的时候，一直提示失败，无法找到目标：
ImageView imageView = (ImageView) findViewById(R.id.img);
imageView.setImageDrawable(getDrawable(com.android.internal.R.drawable.ic_text_dot));
//com.android.internal.R cannot be resolved to a variable
You cannot access id‘s of com.android.internal.R at compile time, but you can access the defined internal resources at runtime and get the resource by name.
ImageView imageView = (ImageView) findViewById(R.id.img);
imageView.setImageResource(Resources.getSystem().getIdentifier("ic_text_dot", "drawable", "android"));
参考：http://stackoverflow.com/questions/3486819/how-to-resolve-the-error-com-android-internal-r-cannot-be-resolved-when-i-usin
Android 如何引用com.android.internal.R目录下的资源
原文：http://www.cnblogs.com/zhou-guobao/p/5145714.html