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Lineageos 22.1(Android 15)更换开机动画

article 2025/2/25 9:53:43

一、原理简介

我们直接用最简单的替换zip的方式来更换开机动画，首先我们要查看系统代码使用的zip包的路径，可能与aosp原生的代码不一定一样。
/frameworks/base/cmds/bootanimation/BootAnimation.cpp

bool BootAnimation::threadLoop() {
    ATRACE_CALL();
    bool result;
    initShaders();

    // We have no bootanimation file, so we use the stock android logo
    // animation.
    if (mZipFileName.empty()) {
        ALOGD("No animation file");
        result = android();
    } else {
        result = movie();
    }
    //**省略后续代码**//
}

看到是使用mZipFileName来判断的，我们看看初始化的地方


bool BootAnimation::findBootAnimationFileInternal(const std::vector<std::string> &files) {
    ATRACE_CALL();
    for (const std::string& f : files) {
        if (access(f.c_str(), R_OK) == 0) {
            mZipFileName = f.c_str();
            return true;
        }
    }
    return false;
}


void BootAnimation::findBootAnimationFile() {
    ATRACE_CALL();
    const bool playDarkAnim = android::base::GetIntProperty("ro.boot.theme", 0) == 1;
    const std::string productBootanimationFile = PRODUCT_BOOTANIMATION_DIR +
        android::base::GetProperty("ro.product.bootanim.file", playDarkAnim ?
        PRODUCT_BOOTANIMATION_DARK_FILE : PRODUCT_BOOTANIMATION_FILE);
    static const std::vector<std::string> bootFiles = {
        APEX_BOOTANIMATION_FILE, productBootanimationFile,
        OEM_BOOTANIMATION_FILE, SYSTEM_BOOTANIMATION_FILE
    };
    static const std::vector<std::string> shutdownFiles = {
        PRODUCT_SHUTDOWNANIMATION_FILE, OEM_SHUTDOWNANIMATION_FILE, SYSTEM_SHUTDOWNANIMATION_FILE, ""
    };
    static const std::vector<std::string> userspaceRebootFiles = {
        PRODUCT_USERSPACE_REBOOT_ANIMATION_FILE, OEM_USERSPACE_REBOOT_ANIMATION_FILE,
        SYSTEM_USERSPACE_REBOOT_ANIMATION_FILE,
    };

    if (android::base::GetBoolProperty("sys.init.userspace_reboot.in_progress", false)) {
        findBootAnimationFileInternal(userspaceRebootFiles);
    } else if (mShuttingDown) {
        findBootAnimationFileInternal(shutdownFiles);
    } else {
    	//查找开机动画的路径
        findBootAnimationFileInternal(bootFiles);
    }
}

通过代码我们可以查找到几个路径，最好验证的方式直接adb shell然后查找几个zip是否存在，也可以看Bootanimation的日志。最后我们发现是在/product/media/下面的动画zip文件。到这里如果有现成的zip可以push直接替换验证，要编译的时候起作用我们还需要看看这个zpi的生成规则。

规则mk的路径
/media/arcxea/stat/lineageos/vendor/lineage/bootanimation/Android.mk

#
# Copyright (C) 2016 The CyanogenMod Project
#               2017-2024 The LineageOS 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.
#

TARGET_GENERATED_BOOTANIMATION := $(TARGET_OUT_INTERMEDIATES)/BOOTANIMATION/bootanimation.zip
$(TARGET_GENERATED_BOOTANIMATION): INTERMEDIATES := $(call intermediates-dir-for,BOOTANIMATION,bootanimation)
$(TARGET_GENERATED_BOOTANIMATION): $(SOONG_ZIP)
	@echo "Building bootanimation.zip"
	@rm -rf $(dir $@)
	@mkdir -p $(INTERMEDIATES)
	$(hide) tar xfp vendor/lineage/bootanimation/bootanimation.tar -C $(INTERMEDIATES)
	$(hide) if [ $(TARGET_SCREEN_HEIGHT) -lt $(TARGET_SCREEN_WIDTH) ]; then \
	    IMAGEWIDTH=$(TARGET_SCREEN_HEIGHT); \
	else \
	    IMAGEWIDTH=$(TARGET_SCREEN_WIDTH); \
	fi; \
	IMAGESCALEWIDTH=$$IMAGEWIDTH; \
	IMAGESCALEHEIGHT=$$(expr $$IMAGESCALEWIDTH / 3); \
	if [ "$(TARGET_BOOTANIMATION_HALF_RES)" = "true" ]; then \
	    IMAGEWIDTH="$$(expr "$$IMAGEWIDTH" / 2)"; \
	fi; \
	IMAGEHEIGHT=$$(expr $$IMAGEWIDTH / 3); \
	RESOLUTION="$$IMAGEWIDTH"x"$$IMAGEHEIGHT"; \
	prebuilts/tools-lineage/${HOST_OS}-x86/bin/mogrify -resize $$RESOLUTION -colors 256 $(INTERMEDIATES)/*/*.png; \
	echo "$$IMAGESCALEWIDTH $$IMAGESCALEHEIGHT 60" > $(INTERMEDIATES)/desc.txt; \
	cat vendor/lineage/bootanimation/desc.txt >> $(INTERMEDIATES)/desc.txt
	$(hide) $(SOONG_ZIP) -L 0 -o $@ -C $(INTERMEDIATES) -D $(INTERMEDIATES)

ifeq ($(TARGET_BOOTANIMATION),)
    TARGET_BOOTANIMATION := $(TARGET_GENERATED_BOOTANIMATION)
endif

include $(CLEAR_VARS)
LOCAL_MODULE := bootanimation.zip
LOCAL_MODULE_CLASS := ETC
LOCAL_MODULE_PATH := $(TARGET_OUT_PRODUCT)/media

include $(BUILD_SYSTEM)/base_rules.mk

$(LOCAL_BUILT_MODULE): $(TARGET_BOOTANIMATION)
	@cp $(TARGET_BOOTANIMATION) $@

include $(CLEAR_VARS)

BOOTANIMATION_SYMLINK := $(TARGET_OUT_PRODUCT)/media/bootanimation-dark.zip
$(BOOTANIMATION_SYMLINK): $(LOCAL_INSTALLED_MODULE)
	@mkdir -p $(dir $@)
	$(hide) ln -sf bootanimation.zip $@

ALL_DEFAULT_INSTALLED_MODULES += $(BOOTANIMATION_SYMLINK)