android 4.4/5.1上使用aar的问题

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在Android6.0上可以使用LOCAL_STATIC_JAVA_AAR_LIBRARIES。build脚本会把指定的aar解压缩到临时目录，并将class.jar和res添加到对应的变量。

LOCAL_STATIC_JAVA_AAR_LIBRARIES := $(strip $(LOCAL_STATIC_JAVA_AAR_LIBRARIES))

    ifdef LOCAL_STATIC_JAVA_AAR_LIBRARIES

    my_full_libs_manifest_deps += $(foreach lib, $(LOCAL_STATIC_JAVA_AAR_LIBRARIES),\

      $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/aar/classes.jar)

    my_full_libs_manifest_files += $(foreach lib, $(LOCAL_STATIC_JAVA_AAR_LIBRARIES),\

      $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/aar/AndroidManifest.xml)

    LOCAL_RESOURCE_DIR += $(foreach lib, $(LOCAL_STATIC_JAVA_AAR_LIBRARIES),\

      $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/aar/res)

    endif

LOCAL_STATIC_JAVA_AAR_LIBRARIES在Android4.4不存在，但是只要参照上面的步骤就可以了。手动将aar解压缩后添加到你的工程，并使用下面类似的语句：

LOCAL_STATIC_JAVA_LIBRARIES += lib_android_recyclerview

    LOCAL_AAPT_FLAGS += --extra-packages android.support.v7.recyclerview

    LOCAL_RESOURCE_DIR += $(addprefix $(LOCAL_PATH)/, android-recyclerview-v7/res)

    LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES += lib_android_recyclerview:android-recyclerview-v7/classes.jar