在手機衛士中，有緩存清理的功能，代碼如下

private void getAppCacheSize(String packageName) {Class clazz = pm.getClass();// 獲取PackageManager的類類型try {Method method = clazz.getDeclaredMethod("getPackageSizeInfo", String.class,IPackageStatsObserver.class);// 把包名傳遞給回調對象//getcacheInfo.packName = packageName;method.invoke(pm, packageName, new GetCacheInfo(packageName));// 結果回調在IPackageStatsObserver的對象中} catch (NoSuchMethodException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} }

報錯如下

java.lang.reflect.InvocationTargetException java.lang.NoSuchMethodException: getPackageSizeInfo

在Android4.2以上版本中，PackageManager.getPackageSizeInfo(String packageName, IPackageStatsObserver observer)不可用，改為PackageManager.getPackageSizeInfo(String packageName, int userHandle, IPackageStatsObserver observer), 至于增加的參數userHandle的解釋是：The user whose size information should be retrieved。下面是PackageManager內部的用法：

/*** Retrieve the size information for a package.* Since this may take a little while, the result will* be posted back to the given observer. The calling context* should have the {@link android.Manifest.permission#GET_PACKAGE_SIZE} permission.** @param packageName The name of the package whose size information is to be retrieved* @param userHandle The user whose size information should be retrieved.* @param observer An observer callback to get notified when the operation* is complete.* {@link android.content.pm.IPackageStatsObserver#onGetStatsCompleted(PackageStats, boolean)}* The observer's callback is invoked with a PackageStats object(containing the* code, data and cache sizes of the package) and a boolean value representing* the status of the operation. observer may be null to indicate that* no callback is desired.** @hide*/public abstract void getPackageSizeInfo(String packageName, int userHandle,IPackageStatsObserver observer);/*** Like {@link #getPackageSizeInfo(String, int, IPackageStatsObserver)}, but* returns the size for the calling user.** @hide*/public void getPackageSizeInfo(String packageName, IPackageStatsObserver observer) {getPackageSizeInfo(packageName, UserHandle.myUserId(), observer);}

代碼修改為

private void getAppCacheSize(String packageName) {Class clazz = pm.getClass();// 獲取PackageManager的類類型try {Method method = clazz.getDeclaredMethod("getPackageSizeInfo", String.class, int.class,IPackageStatsObserver.class);/** * after invoking, PkgSizeObserver.onGetStatsCompleted() will be called as callback function. <br> * About the third parameter ‘Process.myUid() / 100000’，please check: * <android_source>/frameworks/base/core/java/android/content/pm/PackageManager.java: * getPackageSizeInfo(packageName, UserHandle.myUserId(), observer); */ // 把包名傳遞給回調對象//getcacheInfo.packName = packageName;method.invoke(pm, packageName, android.os.Process.myUid() / 100000, new GetCacheInfo(packageName));// 結果回調在IPackageStatsObserver的對象中} catch (NoSuchMethodException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} }

運行后報錯，添加相應的權限即可

java.lang.SecurityException: Neither user 10603 nor current process has android.permission.GET_PACKAGE_SIZE. java.lang.SecurityException: Neither user 10603 nor current process has android.permission.CLEAR_APP_CACHE.

測試后，可用。通過查閱資料，其中Process.myUid() / 100000的解釋為：

表示多用戶中的某一個用戶，因為一個用戶裝的apk可以有100000個，用uid表示，uid/100000的商就是某個特定的用戶id也叫userId或者userHandle。

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