0. 介绍

主要介绍UI位置和基本函数入口，其中耗电详情与power_profile.xml息息相关

1. UI 界面

讯享网

2. 源码

2.1 设置界面入口

PowerUsageSummary->getPreferenceScreenResId()

package com.android.settings.fuelgauge; / * Displays a list of apps and subsystems that consume power, ordered by how much power was * consumed since the last time it was unplugged. */ public class PowerUsageSummary extends PowerUsageBase implements AnomalyDialogListener, OnLongClickListener, OnClickListener { 
    @Override protected int getPreferenceScreenResId() { return R.xml.power_usage_summary; } 

2.2 UI 布局

R.xml.power_usage_summary

讯享网<string name="power_usage_list_summary" msgid="">"充满电（<xliff:g id="TIME">^1</xliff:g>前）后的应用用电量"</string> <PreferenceCategory  android:key="app_list" android:title="@string/power_usage_list_summary"/>

上述即 key 为 app_list 为耗电详情列表

2.3 耗电详情 app_list

PowerUsageSummary.java

 private static final String KEY_APP_LIST = "app_list"; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); ... mAppListGroup = (PreferenceGroup) findPreference(KEY_APP_LIST);

2.4 耗电数据填充

• PowerUsageSummary->refreshAppListGroup， 显示耗电详情
• PowerUsageSummary->addNotAvailableMessage, 显示没有电池使用数据

讯享网 private void refreshAppListGroup() { ... mAppListGroup.addPreference(notAvailable); ... } private void addNotAvailableMessage() { final String NOT_AVAILABLE = "not_available"; Preference notAvailable = getCachedPreference(NOT_AVAILABLE); if (notAvailable == null) { notAvailable = new Preference(getPrefContext()); notAvailable.setKey(NOT_AVAILABLE); // <string name="power_usage_not_available" msgid="">"没有电池使用数据。"</string> notAvailable.setTitle(R.string.power_usage_not_available); mAppListGroup.addPreference(notAvailable); } }

2.5 refreshAppListGroup 数据处理

2.5.1 条件判断-功耗参考文件

PowerUsageSummary->refreshAppListGroup

 // 是否使用假数据 private static final boolean USE_FAKE_DATA = false; // 背光电流的最小值 private static final int MIN_AVERAGE_POWER_THRESHOLD_MILLI_AMP = 10; private void refreshAppListGroup() { // 获取背光亮度功率 final double averagePower = powerProfile.getAveragePower(PowerProfile.POWER_SCREEN_FULL); if (averagePower >= MIN_AVERAGE_POWER_THRESHOLD_MILLI_AMP || USE_FAKE_DATA) { // 这里要求平均电流需要大于 10, 要求我们需要配置 power_profile.xml 文件的电流数据 // frameworks\base\core\res\res\xml\power_profile.xml 厂商根据功耗电流进行配置，否则该项数据始终为无 final List<BatterySipper> usageList = getCoalescedUsageList( USE_FAKE_DATA ? getFakeStats() : mStatsHelper.getUsageList()); } 

小知识

讯享网文件路径在于:frameworks\base\core\java\com\android\internal\os\PowerProfile.java 文件路径:frameworks\base\core\res\res\xml\power_profile.xml / * Power consumption at full backlight brightness. If the backlight is at * 50% brightness, then this should be multiplied by 0.5 */ public static final String POWER_SCREEN_FULL = "screen.full"; <item name="screen.full">0.1</item> <!-- ~300mA -->

2.5.2 功耗文件，获取假数据

PowerUsageSummary-> getFakeStats()

 private static List<BatterySipper> getFakeStats() { ArrayList<BatterySipper> stats = new ArrayList<>(); float use = 5; for (DrainType type : DrainType.values()) { if (type == DrainType.APP) { continue; } stats.add(new BatterySipper(type, null, use)); use += 5; } for (int i = 0; i < 100; i++) { stats.add(new BatterySipper(DrainType.APP, new FakeUid(Process.FIRST_APPLICATION_UID + i), use)); } stats.add(new BatterySipper(DrainType.APP, new FakeUid(0), use)); // Simulate dex2oat process. BatterySipper sipper = new BatterySipper(DrainType.APP, new FakeUid(UserHandle.getSharedAppGid(Process.FIRST_APPLICATION_UID)), 10.0f); sipper.packageWithHighestDrain = "dex2oat"; stats.add(sipper); sipper = new BatterySipper(DrainType.APP, new FakeUid(UserHandle.getSharedAppGid(Process.FIRST_APPLICATION_UID + 1)), 10.0f); sipper.packageWithHighestDrain = "dex2oat"; stats.add(sipper); sipper = new BatterySipper(DrainType.APP, new FakeUid(UserHandle.getSharedAppGid(Process.LOG_UID)), 9.0f); stats.add(sipper); return stats; }

2.5.3 功耗文件，获取功耗数据

frameworks/base/core/java/com/android/internal/os/BatteryStatsHelper.java

BatteryStatsHelper->getUsageList()

讯享网 / * List of apps using power. */ private final List<BatterySipper> mUsageList = new ArrayList<>(); public List<BatterySipper> getUsageList() { return mUsageList; } public void refreshStats(int statsType, SparseArray<UserHandle> asUsers, long rawRealtimeUs, long rawUptimeUs) { ... mUsageList.add(index, bs); ... }