Android PackageStats始终为零 [英] Android PackageStats gives always zero
问题描述
我正在尝试获取应用程序包占用的大小。每个应用程序在内部/外部存储中都有一个位置。
I'm trying to get the size occupied by my application package. Every application has one location in the internal/external storage.
我想计算以下目录的大小,我该怎么做?
我知道我可以使用 StorageStateManager 在Oreo(API 26)设备之上,但我怎样才能在oreo设备之前实现这一点。
I want to calculate the size of the following directory, how can I do that? I know I can use StorageStateManager on and above Oreo (API 26) devices, but how can I achieve this before oreo devices.
应用程序目录: / Android / data / myapplicationpackage
我正在尝试使用 PackageStats 但是它总是给我零。使用此代码的实际方法是什么?
I'm trying to use PackageStats but It's giving me always zero. What's the actual way to use this code?
我使用了以下代码,它给了我全部零。
I used the following code and it gives me all zero.
PackageStats stats = new PackageStats(context.getPackageName());
long codeSize = stats.codeSize + stats.externalCodeSize;
long dataSize = stats.dataSize + stats.externalDataSize;
long cacheSize = stats.cacheSize + stats.externalCacheSize;
long appSize = codeSize + dataSize + cacheSize;
推荐答案
PackageStats stats = new PackageStats(context.getPackageName());
PackageStats stats = new PackageStats(context.getPackageName());
它只会创建packagestats对象。来自来自,构造函数将初始化字段,
It will only creates the packagestats object. As from the source, the constructor will do initializing the fields,
public PackageStats(String pkgName) {
packageName = pkgName;
userHandle = UserHandle.myUserId();
}
for api< 26,
您需要使用 IPackageStatsObserver.aidl
并且必须调用 反射的getPackageSizeInfo
方法。
You need to use IPackageStatsObserver.aidl
and have to invoke getPackageSizeInfo
method by reflection.
PackageManager pm = getPackageManager();
Method getPackageSizeInfo = pm.getClass().getMethod(
"getPackageSizeInfo", String.class, IPackageStatsObserver.class);
getPackageSizeInfo.invoke(pm, "com.yourpackage",
new IPackageStatsObserver.Stub() {
@Override
public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)
throws RemoteException {
//here the pStats has all the details of the package
}
});
这是完整的解决方案。效果很好。
来自api 26 ,
getPackageSizeInfo
方法已被弃用。
您可以使用此代码,
@SuppressLint("WrongConstant")
final StorageStatsManager storageStatsManager = (StorageStatsManager) context.getSystemService(Context.STORAGE_STATS_SERVICE);
final StorageManager storageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
try {
ApplicationInfo ai = context.getPackageManager().getApplicationInfo(packagename, 0);
StorageStats storageStats = storageStatsManager.queryStatsForUid(ai.storageUuid, info.uid);
cacheSize =storageStats.getCacheBytes();
dataSize =storageStats.getDataBytes();
apkSize =storageStats.getAppBytes();
size+=info.cacheSize;
} catch (Exception e) {}
但要使用此代码,您需要使用权限允许。
But to use this code, You need USAGE ACCESS PERMISSION .
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