Android property build. Prop Generation Process

Android property build. Prop Generation Process

This part is onlineArticleGood analysis:

Http://blog.csdn.net/thl789/article/details/7014300 reprinted over

 

Android build. the prop file is a variety of properties (LCD density/Language/Compilation Time, etc.) collected during Android compilation .), after compilation, the file is generated in the out/target/product/<board>/system/directory.

During Android runtime, you can use property_get () [C/C ++ domain]/systemproperties_get * () [Java domain] to read these attribute values.

 

Build. Prop is generated by the make system parsing build/CORE/makefile.

1) define various variables in makefile, which will be used in the next step.

For example:

Product_default_language = "$ (calldefault-locale-language, $ (product_locales ))"\

Product_default_region = "$ (calldefault-locale-region, $ (product_locales ))"\

...

2) Call build/tools/buildinfo. Sh in makefile to execute the script and output it to build. Prop.

Buildinfo. Sh is simple, just echo some attributes, such:

Echo "Ro. Product. locale. Language = $ product_default_language"

Echo "Ro. Product. locale. region = $ product_default_region"

...

Ro. Product. locale. Language/Ro. Product. locale. region are some attributes, and values are followed by equal signs. Product_default_language are defined in other. mk files.

 

 

3) In makefile, add $ (target_device_dir)/system. Prop to build. Prop.

It exists in many directories and will be collected and appended to build. Prop, for example:

./Device/Samsung/maguro/system. Prop

./Device/Samsung/crespo4g/system. Prop

./Device/Samsung/Crespo/system. Prop

./Device/qcom/msm8660_surf/system. Prop

./Device/qcom/msm7630_surf/system. Prop

./Device/qcom/msm8625/system. Prop

./Device/qcom/msm8960/system. Prop

./Device/qcom/msm7627a/system. Prop

......

 

4) collect the attributes in additional_build_properties and append them to build. Prop.

Additional_build_properties collects the attributes defined in product_property_overrides.

Additional_build_properties: = \

$ (Additional_build_properties )\

$ (Product_property_overrides)

 

Product_property_overridesIn build/target/product/CORE. mk:

Product_property_overrides: = \

Ro.config.icationication_sound=onthehunt.ogg \

Ro.config.alarm_alertw.alarm_classic.ogg

Through the analysis of the build. Prop generation process, we can know where to modify the original attributes or add custom attributes, that is

2) buildinfo. Sh;

3) system. Prop;

4) additional_build_properties or product_property_overrides.

However, it is recommended that you change it to system. Prop or product_property_overrides, which corresponds to the modification of a specific platform or product.