1./framework/base/core/res/res/value/srting.xml
Add custom string content. I stepped on a trap here. Through searching, I found the " shutdown" string that I wanted to modify.
/framework/base/core/res/res/values-zh-rCN/srting.xml, the new custom string is only added here, and the compilation will fail, prompting that the string cannot be found.
<string name="sleep_mode">Sleep</string>
2.frameworks\base\core\res\res\symbols.xml
symbol adds custom string
<java-symbol type="string" name="sleep_mode" />
3.Compile
3.1 Compile the framework directly
mmm framework/base -j12
3.2 Compile the entire firmware