獲取安裝應用Apk包大小、緩存大小以及應用占用存儲總大小
可以通過 PackageManager類的getPackageSizeInfo方法獲取，但是這個方法被Google標記成隱藏方法，不能直接調用；
解決方法：可以通過反射調用，但在Android8.0及以上通過反射調用會報錯，不過Android8.0及以上可以通過StorageManager 獲取

Android8.0以下獲取Apk大小方法：
通過反射調用getPackageSizeInfo獲取

創建AIDL文件

• 創建文件 IPackageStatsObserver.aidl

package android.content.pm;import android.content.pm.PackageStats; /*** API for package data change related callbacks from the Package Manager.* Some usage scenarios include deletion of cache directory, generate* statistics related to code, data, cache usage(TODO)* {@hide}*/ oneway interface IPackageStatsObserver {void onGetStatsCompleted(in PackageStats pStats, boolean succeeded); }

• 創建文件 PackageStats.aidl

package android.content.pm;parcelable PackageStats;

注意包名路徑創建正確

如下圖：

創建完成后依次點擊 Build --> Make Project 以生成AIDL文件

在AndroidManifest.xml 中添加權限

<uses-permission android:name="android.permission.GET_PACKAGE_SIZE"/>

代碼實現

public static void handlePackageSizeInfo(Context context, String packageName) {PackageManager mPackageManager = context.getPackageManager();Method getPackageSizeInfo = null;try {getPackageSizeInfo = mPackageManager.getClass().getMethod("getPackageSizeInfo", String.class, IPackageStatsObserver.class);} catch (NoSuchMethodException e) {e.printStackTrace();}MyPackageStatsObserver mSecurityPackageStatsObserver = new MyPackageStatsObserver();if (getPackageSizeInfo != null) {try {getPackageSizeInfo.setAccessible(true);// 調用該函數，待調用完成后會回調MyPackageStatsObservergetPackageSizeInfo.invoke(mPackageManager, packageName, mSecurityPackageStatsObserver);} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {e.printStackTrace();}}}static class MyPackageStatsObserver extends IPackageStatsObserver.Stub {@Overridepublic void onGetStatsCompleted(PackageStats pStats, boolean succeeded) {long mCacheSize = pStats.cacheSize;long mCodeSize = pStats.codeSize;long mDataSize = pStats.dataSize;long mTotalSize = mCacheSize + mCodeSize + mDataSize;Log.d("AppLog", succeeded+ " cacheSize = " + mCacheSize + "; appSize = " + mCodeSize + "; " + "dataSize = " + mDataSize + "; totalSize = " + mTotalSize);}}

Android8.0及以上獲取Apk大小方法：
通過系統服務 StorageManager 獲取Apk大小，需要申請權限 PACKAGE_USAGE_STATS

在AndroidManifest.xml 中添加權限

<uses-permissionandroid:name="android.permission.PACKAGE_USAGE_STATS"tools:ignore="ProtectedPermissions" />

代碼實現

@RequiresApi(api = Build.VERSION_CODES.O)public static void getAppSize(Context context, String packageName){if (!hasUsageStatsPermission(context)){requestAppUsagePermission(context);} else {new Thread(() -> {final StorageStatsManager storageStatsManager = (StorageStatsManager) context.getSystemService(Context.STORAGE_STATS_SERVICE);final StorageManager storageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);final List<StorageVolume> storageVolumes = storageManager.getStorageVolumes();final UserHandle user = android.os.Process.myUserHandle();try {for (StorageVolume storageVolume : storageVolumes) {final String uuidStr = storageVolume.getUuid();final UUID uuid = uuidStr == null ? StorageManager.UUID_DEFAULT : UUID.fromString(uuidStr);Log.d("AppLog", "storage:" + uuid + " : " + storageVolume.getDescription(context) + " : " + storageVolume.getState());Log.d("AppLog", "getFreeBytes:" + Formatter.formatShortFileSize(context, storageStatsManager.getFreeBytes(uuid)));Log.d("AppLog", "getTotalBytes:" + Formatter.formatShortFileSize(context, storageStatsManager.getTotalBytes(uuid)));StorageStats storageStats = storageStatsManager.queryStatsForPackage(uuid, packageName, user);Log.d("AppLog", "storage stats for app of package name:" + packageName + " : ");Log.d("AppLog", "getAppBytes:" + Formatter.formatShortFileSize(context, storageStats.getAppBytes()) + " getCacheBytes:" + Formatter.formatShortFileSize(context,storageStats.getCacheBytes()) + " getDataBytes:" + Formatter.formatShortFileSize(context, storageStats.getDataBytes()));}}catch (PackageManager.NameNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}).start();}}public static boolean hasUsageStatsPermission(Context context) {UsageStatsManager usageStatsManager = null;if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP_MR1) {usageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);}if (usageStatsManager == null) {return false;}long currentTime = System.currentTimeMillis();// try to get app usage state in last 2 minList<UsageStats> stats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, currentTime - 2 * 60 * 1000, currentTime);return stats != null && stats.size() > 0;}public static void requestAppUsagePermission(Context context) {Intent intent = new Intent(android.provider.Settings.ACTION_USAGE_ACCESS_SETTINGS);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);try {context.startActivity(intent);} catch (ActivityNotFoundException e) {Log.e("AppLog", "Start usage access settings activity fail!", e);}}

總結

public static void getInstallApkSize(Context context, String packageName){if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {getAppSize(context, packageName);} else {handlePackageSizeInfo(context, packageName);}}

Android8.0以下可以通過反射getPackageSizeInfo方法獲取Apk大小；
Android8.0及以上可以通過申請權限 PACKAGE_USAGE_STATS 獲取其他已安裝應用的Apk大小
還有一種比較復雜方法是 編譯一下的android2.3的Framework框架，把jar包拷出來，再把框架導入到library，之后就可以直接調用已經hide 的方法 getPackageSizeInfo() 了，具體操作可以搜一下

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