Question

如何为Android系统添加一个新的资源包

Answer 1

如何为Android系统添加一个新的资源包 传统的Android系统只有一个framework-res.apk资源包，第三方厂商在进行rom定制时会直接修改framework res资源，达到美化目的。但是这种方式跟原生资源的耦合度过高，在系统迁移或者framework ui移植时需要进行人工merge，工作量巨大。通过为Android添加一个新的独立的资源包，可以将厂商定制资源独立出来，可移植、可维护性非常好。 具体做法可以分为以下几个步骤： 1. 修改build/core/clear_var.mk LOCAL_USE_LETV_FRAMEWORK_RES:= true 2. 修改build/core/package.mk 以下脚本可以加在 $(R_file_stamp): $(framework_res_package_export_deps) 之前，然后修改$(R_file_stamp): $(framework_res_package_export_deps) 和 $(LOCAL_INTERMEDIATE_TARGETS): \ PRIVATE_AAPT_INCLUDES := $(framework_res_package_export) 如下所示： view sourceprint? 1 ifeq ($(LOCAL_USE_LETV_FRAMEWORK_RES),true) 2 letv_framework_res_package_export := \ 3 $(call intermediates-dir-for,APPS,letv-framework-res,,COMMON)/package-export.apk 4 letv_framework_res_package_export_deps := \ 5 $(dir $(letv_framework_res_package_export))src/R.stamp 6 else 7 letv_framework_res_package_export := 8 letv_framework_res_package_export_deps := 9 endif # LOCAL_USE_LETV_FRAMEWORK_RES view sourceprint? 1 $(R_file_stamp): $(framework_res_package_export_deps) $(letv_framework_res_package_export_deps) 2 $(LOCAL_INTERMEDIATE_TARGETS): \ 3 PRIVATE_AAPT_INCLUDES := $(framework_res_package_export) \ 4 $(letv_framework_res_package_export) 5 endif # LOCAL_NO_STANDARD_LIBRARIES 3. 修改build/target/product/core.mk 在PRODUCT_PACKAGES增加letv-framework-res 4. 添加一个新的资源包项目，这里在framework/base/core/res同级目录下建立一个新的文件夹letv_res用来存放我们的资源。把res目录下的AndroidManifest.xml和Android.mk拷贝过来，进行修改。 记得设置LOCAL_USE_MY_FRAMEWORK_RES为false。 view sourceprint? 01 LOCAL_PATH:= $(call my-dir) 02 include $(CLEAR_VARS) 03 04 LOCAL_MODULE_TAGS := optional 05 06 LOCAL_PACKAGE_NAME := letv-framework-res 07 LOCAL_CERTIFICATE := platform 08 09 # Set LOCAL_USE_LETV_FRAMEWORK_RES as false 10 LOCAL_USE_LETV_FRAMEWORK_RES := false 11 12 # Tell aapt to create "extending (non-application)" resource IDs, 13 # since these resources will be used by many apps. 14 LOCAL_AAPT_FLAGS := -x 15 16 # Install this alongside the libraries. 17 LOCAL_MODULE_PATH := $(TARGET_OUT_JAVA_LIBRARIES) 18 19 # Create package-export.apk, which other packages can use to get 20 # PRODUCT-agnostic resource data like IDs and type definitions. 21 LOCAL_EXPORT_PACKAGE_RESOURCES := true 22 23 # Include resources generated by system RenderScript files. 24 framework_GENERATED_SOURCE_DIR := $(call intermediates-dir-for,JAVA_LIBRARIES,framework,,COMMON)/src 25 framework_RenderScript_STAMP_FILE := $(framework_GENERATED_SOURCE_DIR)/RenderScript.stamp 26 #LOCAL_RESOURCE_DIR := $(framework_GENERATED_SOURCE_DIR)/renderscript/res $(LOCAL_PATH)/res 27 28 include $(BUILD_PACKAGE) 29 30 # Make sure the system .rs files get compiled before building the package-export.apk. 31 #$(resource_export_package): $(framework_RenderScript_STAMP_FILE) 32 33 # define a global intermediate target that other module may depend on. 34 .PHONY: letv-framework-res-package-target 35 letv-framework-res-package-target: $(LOCAL_BUILT_MODULE) view sourceprint? 01 <?xml version="1.0" encoding="utf-8"?> 02 <manifest xmlns:android="" 03 package="letv" coreApp="true" android:sharedUserId="android.uid.system" 04 android:sharedUserLabel="@null"> 05 06 <application android:process="system" 07 android:persistent="true" 08 android:hasCode="false" 09 android:label="@null" 10 android:allowClearUserData="false" 11 android:killAfterRestore="false" 12 android:icon="@null"> 13 14 </application> 15 16 </manifest> 资源的放置跟res下的类似，记得values目录下创建public.xml，public.xml对id的类型区分比较严格，attr必须是0x0x010000开头，drawable必须是0x0x020000开头，其他类型好像就没有限制，直接依次0x0x030000、0x0x040000开始即可。否则，编译过程中会出现segmentation fault错误。 view sourceprint? 1 <resources> 2 <public type="attr" name="cForeground" id="0x03010000" /> 3 <public type="drawable" name="ic_filemanager" id="0x03020000" /> 4 <public type="style" name="LetvTheme" id="0x03030000" /> 5 <public type="string" name="letv" id="0x03040000" /> 6 <public type="dimen" name="letv_width" id="0x03050000" /> 7 <public type="layout" name="letv_text" id="0x03060000" /> 8 </resources> 5. 以上只是解决了资源的编译环境问题，资源的查找过程也需要进行修改，修改 AssetManager.java，在init()后添加代码 addAssetPath("/system/framework/letv-framework-res.apk"); view sourceprint? 01 public AssetManager() { 02 synchronized (this) { 03 if (DEBUG_REFS) { 04 mNumRefs = 0; 05 incRefsLocked(this.hashCode()); 06 } 07 init(); 08 addAssetPath("/system/framework/letv-framework-res.apk"); 09 if (localLOGV) Log.v(TAG, "New asset manager: " + this); 10 ensureSystemAssets(); 11 } 12 } 6. 最后就是资源应用问题。应用程序在xml文件中引用letv-framework-res.apk中的资源时可以使用与原生资源类似的访问方式，首先声明letv xmlns : view sourceprint? 1 xmlns:letv="" 然后像@android:drawable @android:dimen这种引用方式改成@letv:drawable @letv:dimen即可。 view sourceprint? 01 <?xml version="1.0" encoding="utf-8"?> 02 <LinearLayout 03 xmlns:android="" 04 xmlns:letv="" 05 android:layout_width="fill_parent" 06 android:layout_height="wrap_content" 07 android:gravity="center" 08 android:paddingTop="@letv:dimen/letv_width" 09 android:orientation="horizontal" > 10 11 <ImageView android:id="@+id/file_icon" 12 android:layout_width="wrap_content" 13 android:layout_height="wrap_content" 14 android:layout_gravity="center" 15 android:layout_marginBottom="40dp" 16 android:src="@letv:drawable/ic_filemanager" /> 17 18 </LinearLayout> 转载，仅供参考。